JP2001078252A - Cdma base station device - Google Patents

Abstract

(57) [Summary] A user registered in a different sector is also subjected to interference removal processing. SOLUTION: The CDMA base station device 1 is configured to include a plurality of interference canceling devices 10A to 10H. The main user and the sub-user can be registered in each interference canceling apparatus 10, and the interference canceling apparatus 10 performs an interference removal process including the main user and the sub-user. For this reason,
If a user is not only registered as a main user for a certain interference canceling device 10 but also registered as a sub-user for another interference canceling device 10, the sub-user may become a main user in the other interference canceling device 10. It is possible to remove interference given to the user. At this time, the provisional determination result (information symbol) required in the interference removal processing for the sub-user is obtained from the interference cancellation device 10 in which the same user is registered as the main user.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CDMA base station apparatus having a sector structure, for example, direct sequence code division multiple access (DS-CDMA).
CD that adopts Code Division Multiple Access method
The present invention relates to a technique for separating and extracting user signals from received spread signals in an MA base station while reducing mutual interference generated between user signals transmitted from mobile stations registered in different sectors.

[0002]

2. Description of the Related Art In the DS-CDMA system, a user signal transmitted from each mobile station is spread over a wide frequency band by a unique spreading code and transmitted to a transmission line. On the other hand, the base station performs a despreading process using the same spreading code as the mobile station side on the received spread signal on which a plurality of user signals are superimposed, and further performs a transmission path estimation process to obtain the original user signal. Is separated and extracted. At this time, due to the cross-correlation between the spreading codes, the user signals actually separated and extracted include mutual interference.

[0003] In order to reduce such mutual interference, conventionally, various multi-stage interference canceling devices have been proposed. For example, Japanese Patent Application Laid-Open No. Hei 10-51353 discloses that
A successive processing type symbol replica interference cancellation apparatus is disclosed. In this device, a plurality of interference cancellation units (ICU; Interference Can
celing Unit) is provided for each stage. Each IC
In U, an interference replica (excluding the first stage) and an error signal (a received spread signal in the highest ICU of the first stage) supplied from the ICU corresponding to the same user provided in the previous stage are input, and A residual estimation signal (excluding the lowest ICU of the final stage) and an interference replica (excluding the final stage) are output.

[0004] The interference replica is an estimated signal component (despread signal) of the corresponding user included in the received spread signal.
The interference residual estimation signal is an estimation signal component (spread signal) of the corresponding user included in the error signal. The error signal is obtained by subtracting all the interference residual signals already output from the received spread signal.

In this interference canceling apparatus, when a received spread signal is input to the highest ICU in the first stage,
The accuracy of the interference replica improves as the stages are stacked,
The interference residual estimation signal and the error signal approach zero. And
In the final stage, a demodulated signal corresponding to the interference replica is output from each ICU, and this demodulated signal has reduced mutual interference between user signals.

FIG. 26 is a diagram showing a configuration example of a CDMA base station apparatus using such a conventional interference cancellation apparatus. CDMA base station apparatus 300 shown in FIG. 1 includes sector antennas 304A to 304H, receiving sections 302A to 302
H, and includes interference cancellation devices 306A to 306H. The sector antennas 304A to 304H are
It corresponds to each sector managed by the CDMA base station apparatus 300. In the receiving units 302A to 302H, the sector antennas 304A to 304H are configured to include a frequency conversion circuit and a quadrature detection circuit, and baseband signals obtained by signal processing in those circuits are supplied to the interference cancellation devices 306A to 306H. It has become so. Interference cancellation devices 306A to 306H
Has, for example, the same configuration as the interference canceling device according to the above-mentioned publication, and reduces the mutual interference between users registered in advance, while reducing the sector antennas 304A to 304H.
Then, the demodulated signals related to the registered users are separated and extracted from the spread signals received at (1). The demodulated signals for each user thus obtained are used in a base station host device (not shown).

[0007]

In the figure, a mobile station 308Y and a mobile station 308Z are provided with an interference canceling device 306.
When the user is registered in B, mutual interference generated between the user signal transmitted from the mobile station 308Y and the user signal transmitted from the mobile station 308Z is reduced by the interference canceling device 306B. Thus, the interference canceling device 306B generates a demodulated signal with reduced mutual interference between users for the mobile stations 308Y and 308Z.

On the other hand, when the mobile station 308X is registered in the interference canceling device 306A, the user signal transmitted from the mobile station 308X and the interference canceling device 3
Mutual interference occurring between the mobile station and a user signal transmitted from another mobile station (not shown) registered in 06A is reduced by the interference canceling device 306A. Then, in the interference cancellation device 306A, demodulated signals for those mobile stations are generated.

When the mobile station 308X performs a handover from the sector corresponding to the interference canceling device 306A to the sector corresponding to the interference canceling device 306B, the mobile station 308X transmits the spread signal received by the sector antenna 304B from the mobile station 308X. The rate at which user signals are superimposed increases. However, even in such a case, the mobile station 308X may use the interference cancellation device 306
Although registered in A, the interference canceling device 30
6B, the interference canceling device 306
In B, the user signal of mobile station 308X is
The interference with the 308Z user signal cannot be reduced. That is, in the related art, in one sector, interference cancellation processing is performed only between users registered in that sector, and it is not possible to cancel mutual interference between those registered users and registered users in neighboring sectors. .

The present invention has been made in view of the above problems, and has as its object to provide a novel CDMA base station apparatus capable of reducing the interference of a registered user in a certain sector with a registered user in a neighboring sector. Is to do.

[0011]

(1) In order to solve the above problems, a plurality of first sector interference cancel units respectively associated with any of the registered main users belonging to the first sector registered main user group are included. The demodulated signal relating to the first sector registered main user group is transmitted to the first sector registered main user group by reducing the mutual interference generated between the first sector registered main user groups by the cooperation of the first sector interference canceling unit group. A first sector interference canceling device that separates and extracts from a spread signal received by a sector antenna, a plurality of second sector interference canceling units respectively associated with any registered main user belonging to a second sector registered main user group, and It is configured to include a sub-interference cancellation unit associated with a predetermined registered sub-user, Mutual interference generated between the second sector registered main user group and the registered sub-user by the cooperation of the plurality of second sector interference canceled units and the sub interference canceling unit. While extracting and extracting from the spread signal received by the second sector antenna while reducing
And a sector interference canceling device, wherein at least one of the first sector interference canceling units comprises the first
Based on a spread signal received by a sector antenna or a signal resulting from the spread signal, including a temporary determination means for temporarily determining an information symbol relating to a first sector registered main user associated with the first sector interference cancellation unit,
The sub-interference canceling unit is configured to perform signal processing based on the information symbol to which the same user as the first sector registered main user is assigned as the registered sub user and provisionally determined with respect to the first sector registered main user. And cooperating with the plurality of second sector interference canceling units to reduce interference of the registered sub-user to the second sector registered main user group.

In the present invention, a first sector registered main user is also registered as a sub user in the second sector interference canceling apparatus. The sub-interference canceling unit associated with the registered sub-user cooperates with the second sector interference canceling unit to reduce the influence of the registered sub-user on the second sector registered main user group. Therefore, the BER characteristic of the demodulated signal for the second sector registered main user group can be improved.

At this time, in the present invention, the sub-interference canceling unit performs signal processing based on the information symbols provisionally determined by the provisional determination means. This information symbol is obtained by signal processing based on a spread signal received by the first sector antenna or a signal resulting from the spread signal. A user signal related to a registered sub-user (that is, a first sector registered main user whose information symbol is provisionally determined by the provisional determination means) is superimposed on the received spread signal at the first sector antenna at a higher signal level. In many cases, a signal related to a registered sub-user is superimposed only at a low signal level on a spread signal received by the second sector antenna. In the present invention, the sub-interference canceling unit performs signal processing based on a spread signal received by the first sector antenna in the first sector interference canceling unit or an information symbol provisionally determined based on a signal resulting from the spread signal. Is going. Therefore, the second sector interference canceling apparatus can also perform signal processing based on highly reliable information symbols. As a result, in cooperation with the plurality of second sector interference canceling units, the registered sub-user can be more suitably used. Interference given to the second sector registered main user group can be reduced.

(2) In one aspect of the present invention, based on spread signals received by the first and second sector antennas, detecting means for detecting a correlation value between the spread signals and a predetermined spread code group; A user allocating unit for allocating the registered sub-user based on a detection result by the detecting unit.

According to this aspect, for example, if there is a sector including a path having a correlation value equal to or greater than a predetermined threshold other than the sector to be registered as a main user, the user is registered as a sub-user for that sector. In this way, a subuser can be registered only in a sector in which a path having a certain correlation value exists. As a result, the number of sub-users can be reduced and signal processing can be simplified.

(3) In one aspect of the present invention, the sub-interference canceling unit converts a received symbol related to the registered sub-user based on a spread signal received by the second sector antenna or a signal resulting from the spread signal. A reception symbol generation unit that generates the reception symbol for each path, wherein the provisional determination unit is generated by the reception symbol generation unit in addition to a spread signal received by the first sector antenna or a signal caused by the spread signal; Based on the received symbol, the information symbol regarding the corresponding first sector registered main user is provisionally determined.

According to this aspect, the received symbol generated by the sub-interference cancellation unit is used as a basis for provisional determination of an information symbol in the first sector interference cancellation unit. For this reason, the reliability of the information symbol that is provisionally determined can be improved.

(4) In one aspect of the present invention, the plurality of first sector interference canceling units have a multi-stage configuration, and the first sector interference canceling unit includes the tentative determination means in each stage except the first stage. A plurality of second sector interference canceling units and the sub interference canceling unit also have a multi-stage configuration corresponding to a multi-stage configuration in the plurality of first sector interference canceling units, and each stage has The sub interference cancel unit is provided,
The tentative determination means tentatively determines an information symbol relating to a corresponding first sector registered main user based on a received symbol generated by the sub-interference cancellation unit provided in a previous stage.

[0019] In this aspect, the first sector interference canceling unit tentatively determines an information symbol related to the registered main user based on a received symbol generated by the sub interference canceling unit provided in the previous stage. Since the received symbol generally has a large amount of data, by using the received symbol for provisional determination of the information symbol in the next stage and thereafter, the transfer time of the received symbol from the sub-interference cancellation unit to the first sector interference cancellation unit is reduced. You can earn.

(5) In one aspect of the present invention, the tentative determination means is generated by the reception symbol generation means in comparison with a spread signal received by the first sector antenna or a signal caused by the spread signal. After treating the received symbol as inferior, the information symbol relating to the corresponding first sector registered main user is provisionally determined.

As described above, the received symbols generated by the sub-interference cancellation unit are used as a basis for the provisional decision of the information symbol, but the received symbols generated by the sub-interference cancellation unit are those generated in the previous stage. Given this, it seems that reliability is low. For this reason, in this aspect, at the time of the provisional determination, the received symbol generated by the sub-interference cancellation unit is treated inferior to the spread signal received by the first sector antenna or the signal caused by the spread signal. This makes it possible for the first sector interference cancellation unit to make a more reliable provisional determination.

(6) In one aspect of the present invention, the sub-interference cancellation unit is configured to transmit channel information on the registered sub-user based on a spread signal received by the second sector antenna or a signal resulting from the spread signal. Transmission path estimating means for estimating each of the paths, the provisional determination means based on the information symbol provisionally determined by the provisional determination means and the transmission path information estimated by the transmission path estimation means. An equivalent symbol generation unit that generates an equivalent symbol corresponding to a received symbol relating to a user for each path, in addition to a spread signal received by the first sector antenna or a signal resulting from the spread signal, and further based on the equivalent symbol. Then, an information symbol relating to the corresponding first sector registered main user is provisionally determined.

According to this aspect, an equivalent symbol corresponding to the received symbol is used as a basis for provisional determination of an information symbol in the first sector interference cancellation unit. For this reason, the reliability of the temporary determination can be improved. Further, since the transmission path information often has a smaller data amount than the received symbols, according to this aspect, the data transfer amount from the sub interference cancellation unit to the first sector interference cancellation unit can be suppressed.

(7) In one aspect of the present invention, the plurality of first sector interference canceling units have a multi-stage configuration, and the first sector interference canceling unit includes the tentative determination means in each stage except the first stage. A plurality of second sector interference canceling units and the sub-interference canceling unit also have a multi-stage configuration, corresponding to a multi-stage configuration in the plurality of first sector interference canceling units. The sub interference cancel unit is provided,
The equivalent symbol generation means, based on the transmission path information estimated in the previous stage, and the information symbol tentatively determined in any of the stages, generates an equivalent symbol corresponding to the received symbol related to the registered sub-user for each path. Generate.

According to this aspect, the first sector interference canceling unit performs the first sector interference canceling based on the transmission path information generated by the sub interference canceling unit provided in the previous stage.
The information symbol relating to the sector registration main user is provisionally determined. As described above, by using the transmission path information for the tentative determination in the next and subsequent stages, it is possible to increase the data transfer time from the sub interference cancellation unit to the first sector interference cancellation unit.

(8) In one aspect of the present invention, the provisional determination means treats the equivalent symbol inferior to a spread signal received by the first sector antenna or a signal caused by the spread signal. Then, the information symbol relating to the corresponding first sector registered main user is provisionally determined.

As described above, the equivalent symbol is used as a basis for tentatively determining the information symbol. The equivalent symbol is based on the transmission path information generated in the previous stage.
It seems that reliability is low. For this reason, in this aspect, the equivalent symbol is treated as being inferior to the spread signal received by the first sector antenna or the signal caused by the spread signal. This makes it possible to make a highly reliable temporary determination in the first sector interference cancellation unit.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG. 1 is a diagram showing an overall configuration of a CDMA base station apparatus according to Embodiment 1 of the present invention. The CDMA base station device 1 shown in FIG. 1 includes eight sector antennas 6A to 6H, and receiving units 2A to 2H are connected to the sector antennas 6A to 6H, respectively.

The receiving units 2A to 2H include a frequency conversion circuit and a quadrature detection circuit, and output baseband signals from signals received by the sector antennas 6A to 6H. The baseband signals correspond to the respective interference canceling devices 10A to 10A.
It is supplied to the searcher 5 while being supplied to 10H.

Searcher 5 receives spread codes of all users to be managed by CDMA base station apparatus 1, and
The multipath timing and the correlation value are detected for each sector with respect to the spreading code of each user by matching all baseband signals output from H. Then, the searcher 5 determines whether the spreading code of each user has the highest correlation value with any sector obtained from any of the baseband signals. Then, the user is registered as the main user in the interference cancellation device 10 of the sector having the highest correlation value. If there is a sector other than the interference cancellation device 10 registered as the main user that includes a path having a correlation value equal to or greater than the predetermined threshold, the user is registered as a sub-user in the interference cancellation device 10 of that sector. I do. This user registration content is registered in the interference canceling devices 10A to 10H and also in the signal relay unit 4.

The interference canceling apparatuses 10A to 10H reduce the interference between the registered main users and registered sub-users, and generate demodulated signals R _m (A) to R _m (H) for the main user, respectively. Output. At this time, the interference cancellation apparatuses 10A to 10H are provided with a plurality of interference cancellation units corresponding to the registered main user and the registered sub-user, respectively. Then, in the interference removal processing, in the interference cancellation unit corresponding to the main user, the provisional determination of the information symbol related to the main user is repeated. The information symbols thus obtained are transferred via the bus 3 and the signal relay unit 4 to the interference cancellation device 10 in which the same user is registered as a sub-user. Further, in the interference cancellation apparatus 10, a reception symbol is provisionally generated by an interference cancellation unit corresponding to a sub-user. The received symbol is transmitted via the bus 3 and the signal relay unit 4 to the interference cancellation apparatus 10 in which the same user is registered as the main user.
To be forwarded to.

FIG. 2 is a diagram showing a configuration of the interference cancellation apparatus 10 provided in the CDMA base station apparatus 1 according to the first embodiment. This interference cancellation device 10 is used as the interference cancellation devices 10A to 10H shown in FIG.

As shown in FIG. 1, the interference cancel apparatus 10 includes a first stage 12-1 to an N-th stage 12-
N, and M users are registered as main users or sub-users.
The plurality of user signals from the code-division-multiplexed baseband signal R _b, while reducing the mutual interference caused between them registered main user and registered sub-user, especially outputs a demodulated signal R _m concerning registration main user .

First, the first stage 12-1 includes an ICU (interference canceling unit) 14-1 corresponding to each of M users (registered main user and registered sub-user).
-1 to 14-1-M are connected in parallel. further,
The first stage 12-1 is provided with a delay element 16-1 and an adder 18-1. Second stage 12-
Similarly, in the second to (N-1) th stages 12- (N-1), the ICUs 14 corresponding to each of the M users
-N-1 to 14-n-M are connected in parallel (2 ≦
n ≦ N−1). The n-th stage 12-n-2 is provided with a delay element 16-n and an adder 18-n (2 ≦ n ≦ N−1). The N-th stage 12-N, which is the final stage, is also provided with ICUs 14-N-1 to 14-NM that are connected in parallel corresponding to each of the M users. However, the N-th stage 12-N does not necessarily require a delay element and an adder. ICU14-N
From what the main user of the -1~14-N-M is assigned is output demodulated signal R _m.

When the interference cancellation apparatus 10 is realized by hardware, it is not always necessary to actually prepare hardware for all stages. For example, hardware may be used for one stage, and the hardware may be reused in another stage.

ICU provided on first stage 12-1
14-1-1 to 14-1-M include the baseband signal R
_b has been entered. Those ICU14-1-1 to 14
The interference residual signals e _{1, m} are output from −1-M (1 ≦ m ≦ M), and are given negative signs and supplied to the adder 18-1. The baseband signal _Rb passed through the delay element 16-1 is also input to the adder 18-1. Here, a signal obtained by subtracting all the interference residual estimation signals e1 _{, m} from the baseband signal _Rb is obtained. Generated. This signal is supplied as an error signal r ₁ for the next stage. The delay element 16-1 includes ICUs 14-1-1 to 14
This is a circuit for delaying the baseband signal _Rb by the time required for signal processing in -1-M.

The ICU 14-1-m also outputs interference replicas h _{1, m} (1 ≦ m ≦ M). The interference replica h _{1, m} is supplied to the ICU 14-2-m correspondingly provided in the next stage. In the second stage 12-2 and thereafter, in the n-th stage 12-n, the IC
The error signal r _n-1 generated in the previous stage is input to U14-nm (2 ≦ n ≦ N: 1 ≦ m ≦
M). The ICU 14-nm generates an interference residual estimation signal e _{n, m} based on the error signal r _n-1 and the interference replica h _{n-1, m} supplied from the previous stage. (2 ≦ n ≦ N−1: 1 ≦ m ≦ M). This interference residual estimation signal en _{, m} is given negative decoding and
Is supplied to The adder 18-n has a delay element 16-
n, an error signal rn _-1 is also input, and a signal obtained by subtracting all the interference residual estimation signals en _{, m} generated in the N-th stage 12-n from the error signal rn _-1 is obtained. Is to be generated. This signal is fed to the next stage as an error signal r _n. The delay element 16-n is connected to the ICU 14-
This is a circuit which delays the error signal r _{n- 1} to the input signal by the time required for the signal processing of nm. Also, ICU14-
mn output interference replicas hn _{, m} , respectively, which correspond to the corresponding ICU in the next stage.
14- (n + 1) -m (2 ≦ n ≦ N−1:
1 ≦ m ≦ M).

In the N-th stage 12-N, the error signal r _N-1 generated in the previous stage is input to the ICU 14-N-m (1 ≦ m ≦ M). And ICU14-N-
m, the error signal r _N−1 and the (N−1) th stage 12
-ICU1 provided correspondingly in (N-1)
4- (N-1) -m interference replica h
_{Based on N−1, m} , a demodulated signal R _m for the m-th user is generated (1 ≦ m ≦ M). The demodulated signal R _m is an external output, used in the base station host apparatus (not shown).

In the interference canceling apparatus 10 shown in FIG. 1, the m-th user is from ICU 14-1-m to 14-N-.
m. At this time, the user can be assigned as a main user or as a sub-user. Here, a case where the first to (M-1) th users are registered as main users and the Mth user is registered as subusers will be described.

FIG. 3 is a diagram showing the configuration of the ICU 14-nm (m ≠ M) for performing signal interference removal processing for the main user. As shown in the figure, ICU14-nm
Is configured to include a front-stage finger 28 and a rear-stage finger 42. First stage finger 28 and second stage finger 42
Are provided according to the multipath. The pre-finger 28 is configured to include a despreading unit 30, an adder 32, a transmission path estimating unit 34, and a multiplier 36. On the other hand, the latter-stage finger 42 includes a multiplier 44, an adder 46, and a spreading unit 48, respectively.

The error signal r _n-1 generated in the previous stage is input from the terminal 64 to the previous stage finger 28 (the baseband signal R in the first stage 12-1).
_b ). The error signal rn _-1 is distributed to a despreading unit 30 provided in each preceding finger 28. The spreading code of the main user is registered in the despreading unit 30 by the searcher 5, and the multipath user signal is despread using the spreading code. The despread signal is generated by the adder 32 for the same user in the previous stage and added to the interference replica h _{n-1, m} (null signal in the first stage 12-1) input from the terminal 66. It has become. The output of the adder 32 is supplied to a transmission path estimating unit 34 and also to a multiplier 36.

In the transmission path estimating section 34, for example, the adder 32
The phase difference and the signal level difference generated in the transmission path are detected by using the pilot signal portion included in the output signal from. The detection result is supplied to the multiplier 36 and the multiplier 44 included in the subsequent finger 42 as transmission path estimation information.
In the multiplier 36, the conjugate signal of the transmission path estimation information and the adder 3
The signal is multiplied by the output signal from the second signal, thereby generating a signal in which the phase difference and the signal level difference generated in the transmission line are canceled, that is, a received symbol. The received symbols generated by each of the first-stage fingers 28 are supplied to the path selection unit 37. The path selection unit 37 includes an ICU for performing interference removal processing related to the sub-user,
Are also provided. The path selection unit 37 supplies the received symbols to the RAKE combining unit 38 by, for example, selecting a predetermined number with a large signal level from the received symbols, or selecting all of them regardless of the signal level. The RAKE combining section 38 RAKE combines the received symbols to generate a combined symbol.

The composite symbol is supplied to hard decision section 40. The hard decision unit 40 tentatively decides a signal that would have been transmitted from the user, that is, an information symbol, based on the combined symbol. The information symbols are respectively distributed to the respective subsequent-stage fingers 42, and are provided in another interference canceling device 10 via the bus 3 and the signal relay unit 4.
It is also supplied to the ICU for the interference removal processing for the sub-user. In particular, in the final N-th stage 12-N,
The information symbols output from the hard decision section 40 are externally output as demodulated signals.

In the latter stage finger 42, a multiplier 44
The transmission path information generated by the transmission path estimating section 34 and the hard decision section 4
0 is multiplied by the information symbol generated. Thereby, the phase difference and the signal level difference generated in the transmission path are added to the information symbol again. The output signal from the multiplier 44 is output from the terminal 68 as an interference replica h _{n, m} .

The output signal from the multiplier 44 is also supplied to an adder 46. To the adder 46, the interference replica h _{n-1, m} generated for the same main user in the previous stage and input from the terminal 66 is input with a negative sign. That is, the adder 46 calculates, for a certain main user, the interference replica h _{n, m} generated in the current stage and the interference replica h _n generated in the previous stage.
A signal representing the difference between _{n-1 and m} is output.

The output signal from the adder 46 is supplied to a spreading section 48, where respreading processing is performed using the same code as the spreading code used in the despreading section 30. The output of the spreading unit 48 is supplied to an adder 50, where the spread signals generated by the respective subsequent-stage fingers 42 are added. The output of the adder 50 is output from the terminal 70 as an interference residual estimation signal en _{, m} .

FIG. 4 shows an IC provided in the interference canceling apparatus 10 for interference removal processing for a sub-user.
It is a figure which shows the structure of U14-nM (1 <= n <= N).
The ICU 14-nM shown in the figure is for performing the interference cancellation processing for the sub-user, and the ICU 14-n-M (1 ≦ n ≦ N: m ≠) for performing the interference cancellation processing for the main user.
Similarly to M), it is configured to include the front stage finger 28 and the rear stage finger 42. IC for sub-user shown in FIG.
U14-nm is ICU14-nm for main user
The difference from (m ≠ M) is the following two points.

The first difference is that, instead of using the RAKE combining section 38 and the hard decision section 40 to independently perform the provisional decision of the information symbol, the output of the multiplier 36 provided in the front-stage finger 28 is connected to the bus. 3 and the main user ICU 14-nm (m ≠ M) provided in the other interference canceling device 10 via the signal relay unit 4 and in which the same user is registered as the main user. This is the point of transfer. The second difference is that the information symbols obtained by the tentative decision there are returned to the original sub-user ICU 14-n-M via the bus 3 and the signal relay unit 4 and are used in the subsequent finger 42. It is a point to do.

Thus, the ICU 14-n for the sub-user
In −M, the terminal 70 outputs the interference residual estimation signal en _{, M} for the sub-user, and the terminal 68 outputs the interference replica h _{n, M} for the sub-user. Further, the interference replica hn _{-1, M} related to the sub-user generated in the previous stage is input from the terminal 66.

In the CDMA base station apparatus 1 according to the first embodiment, the detection result of the searcher 5 is registered in the signal relay unit 4. For example, when a certain user is performing handover from the sector corresponding to the sector antenna 6A to the sector corresponding to the sector antenna 6B, the user is registered as a main user in the interference cancellation apparatus 10A before the handover. Registered as a sub-user with the interference canceling device 10B. The registered contents are obtained by matching the spreading code corresponding to the user with the baseband signal output from the receiving unit 2A and the baseband signal output from the receiving unit 2B, and obtaining a correlation value between the two. It is determined. For example, the baseband signal output from the receiving unit 2A includes a path having the highest correlation value, and the baseband signal output from the receiving unit 2B includes a path having a correlation value equal to or higher than a predetermined threshold value. If so, the main user registration may be performed on the interference canceling apparatus 10A, and the sub-user registration may be performed on the interference canceling apparatus 10B.

As described above, since a certain user is registered as a main user in the interference canceling apparatus 10A and registered as a sub-user in the interference canceling apparatus 10B, the interference generated between the main users in the interference canceling apparatus 10B can be reduced. Not only can the interference be removed, but also the interference between the main user and the sub-user can be eliminated. At this time, in the CDMA base station apparatus 1 according to the first embodiment, the ICU 14-nm for the main user is used.
The information symbol generated by (m ≠ M) is transmitted to the sub-user ICU 1 provided in another interference canceling apparatus 10.
4-n-M and the same user is registered as a sub-user, and transfer is performed. For example, in the above example, since a certain user is registered as the main user with the interference canceling device 10A and registered with the interference canceling device 10B, the ICU 14-n for the main user of the interference canceling device 10A is used. −
The information symbol is transferred from m (m シ ン ボ ル M) to the ICU 14-n-M for the sub-user of the interference cancellation apparatus 10B. For this transfer, the registered contents of the signal relay unit 4 are referred to. That is, the signal relay unit 4 registers which interference canceller 10 a certain user is registered as a main user and which interference canceller 10 is registered as a sub-user. The unit 4 transfers the information symbols sent to the bus 3 to another interference canceling device 10 according to the registered contents.

The ICU 14-n-M for the sub-user
Then, the received symbol (the output signal from the multiplier 36) generated there is transmitted via the bus 3 and the signal relay unit 4 to the ICU 14- for the main user of the other interference canceling apparatus 10.
mn (m ≠ M) and the same user is registered as the main user. For example, in the above-described example, the interference canceling device 1 is transmitted from the ICU 14-n-M for the sub-user of the interference canceling device 10B.
ICU14-nm for main user of 0A (m ≠ M)
Are received. Upon receiving this received symbol, ICU 14-nM (m ≠) for the main user
In M), in addition to the received symbols generated by the preceding-stage finger 28, RAKE combining is performed based on the received symbols transferred from another interference canceling device 10, and a hard decision is made. As described above, the reception symbol generated by the sub-user ICU 14-nm of the other interference canceling apparatus 10 is converted to the main user ICU 14-nm.
By using it as the basis of the provisional decision at (m ≠ M), the reliability of the provisional decision at the ICU 14-nm (m ≠ M) for the main user can be improved.

In CDMA base station apparatus 1 according to Embodiment 1, the received symbols are transferred from sub-user ICU 14-nM to main user 14-nm (mｎM). However, as described later, transmission path estimation information (or a conjugate signal thereof) output from the transmission path estimating unit 34 may be transferred instead of the received symbol. The transmission path estimation information is generated based on a fixed number of symbols, and is updated every fixed number of symbols. Therefore, only the updated transmission path estimation information is transmitted via the bus 3 and the signal relay unit 4 to another interference canceling device 1.
It is enough to transfer to 0. ICU14 for main user
-Nm (m ≠ M), the ICU 14-
Using the transmission path estimation information received from nM and the information symbols already generated in the ICU 14-nm (m ≠ M) for the main user, an equivalent symbol corresponding to the received symbol is obtained. Generate. Then, the equivalent symbol is supplied to the path selection unit 37. Even in this case, as in the case where the received symbol itself is transferred from the sub-user ICU 14-nm to the main user ICU 14-nm (m ≠ M), the main user ICU 14-nm (m
The accuracy of the provisional determination in (M) can be improved.

Embodiment 2 Embodiment 1 described above
In the CDMA base station apparatus 1 according to the first embodiment, the interference canceling apparatus 10 having the configuration shown in FIG. 2 is used. Instead, the interference canceling apparatus 10a shown in FIG.
May be used. This interference canceling device 10a is of a so-called sequential processing type, and includes a first stage 12a-
It is configured to include first to Nth stages 12a-N.
The interference canceling device 10a is also provided with a level ranking circuit 20. The level ranking circuit 20 ranks the signal levels of the user signals of the first user to the M-th user, and according to the ranking,
A user is assigned to the ICU 14-nm provided in each stage (1 ≦ n ≦ M; 1 ≦ m ≦ M). Specifically, at each stage, the ICU 14-n-1 to ICU 14-n-1 are sequentially assigned from a user having a higher signal level to a user having a lower signal level.
14-14a-n-M. However, in the interference cancellation apparatus 10a, the registered users include the main user and the sub-user. Here, since the signal level of the sub-user is often low, the sub-user may be assigned to the lower-level ICU 14a-nm. Here, a description will be given assuming that a sub-user is allocated to the lowest ICU 14a-n-M.

In the first stage 12a-1, ICUs 14a-1-1 to 14a-1-M respectively corresponding to M users (main users and sub-users) are connected in series. m is the delay element 1
6a-1-m are connected in parallel (1 ≦ m ≦ M). I
Each of the CUs 14a-1-m outputs an interference residual estimation signal e _{1, m} . The interference residual estimation signal e _{1, m} is added to the adder 18a-1 after the negative sign is given.
-M has been entered. The adder 18a-1-m is connected to the higher-order adder 18 via the delay element 16a-1-m.
An output signal of a-1- (m-1) is provided (the baseband signal _Rb at the highest level). Thus, the adder 18
In a-1-m, a signal obtained by sequentially subtracting the interference residual estimation signal e _{1, m} from the baseband signal R _b , that is, an error signal r
_{1, m} is generated. The error signal r _{1, m} is
Delay element 16a-1- (m + 1) and ICU 14a-1
− (M + 1). Also, the lowest adder 18
The error signal r1 _{, M} output from a-1-M is the following second signal:
ICU1 provided at the top of stage 12a-2
4a-2-1.

After the second stage 12a-2, on the n-th stage 12a-n, ICUs 14a-n-1 to 14a-n-M corresponding to M users are provided in series. (2 ≦ n ≦ N−1). These ICs
A delay element 16a-nm is also connected in parallel to U14a-nm. The output signal from the delay element 16a-nm (the error signal r _{n, m} , or the error signal r
_The signal obtained by delaying _{n-1, M} ) is input to the adder 18a-nm, and the adder 18a-nm further receives I
Interference residual estimation signal e output from CU 14a-nm
_{n and m} are input with a negative sign, and the difference between them, that is, an error signal r _{n, m} is calculated. The error signal rn _{, m} is supplied to the next delay element 16a-n- (m + 1) (in the case of the lowest order, the delay element 16a- (n + 1) -1), and the ICU 14a-n- (m + 1) ( In the case of the lowest order, it is supplied to the ICU 14a- (n + 1) -1).

The Nth stage 12a which is the final stage
N also has an ICU 14a corresponding to each of the M users
-N-1 to 14a-NM are provided in series. For the ICU 14a-Nm, the delay element 16
aNm are connected in parallel (1 ≦ m ≦ M−1).
The output of the delay element 16a-N-m is added to the adder 18a-N-m.
Is supplied to Note that a delay element and an adder corresponding to the ICU 14a-NM are not required. And ICU1
From 4a-N-m output demodulated signal R _m according to m user (m ≠ M). ICU14a-1-M to 14a-
Since the sub-user is allocated to NM as described above, no demodulated signal is output from the ICU 14a-NM.

In the configuration described above, the ICU 14a-1-M for the sub-user includes the ICU 14-1-1 shown in FIG.
n-M is used. Also, ICU1 for the main user
4a-nm (m ≠ M) includes the ICU1 shown in FIG.
4-nm (m ≠ M) is used. In addition, a certain IC
When a sub-user is assigned to U14a, FIG.
Functions as the 14-nM shown in FIG. 3, and conversely, when the main user is assigned, the ICU 1 shown in FIG.
4-nm (m ≠ M) so that each ICU1
4a may be configured.

Even if the above-described interference canceling apparatus 10a is used, a user registered as a main user in another sector can be registered as a sub-user, so that interference cancellation processing for the sub-user can be performed.

Embodiment 3 FIG. 6 is a diagram showing a configuration of an interference cancellation device used in a CDMA base station device according to Embodiment 3 of the present invention. An interference canceling device 10b shown in FIG. 2 is used in the CDMA base station device 1 shown in FIG. 1 instead of the interference canceling device 10 shown in FIG. In the interference cancellation device 10 shown in FIG. 2, with the error signal r _n output from the adder 18-n at each stage is supplied to the 16 delay elements of the next stage (n + 1), IC
U14- (n + 1) -m (1 ≦ m ≦
M), in the interference canceling device 10b shown in the figure, the baseband signal _Rb that has undergone n-times delay processing via the delay elements 16b-1 to 16b-n is converted into an n-th stage 12b
-N adder 18b-n and the (n
+1) stage 12b- (n + 1) delay element 16b-
(N + 1). And the n-th stage 1
Error signal r output from adder 18b-n of 2b-n
_n is supplied to the next stage ICU 14b- (n + 1) -m (1 ≦ m ≦ M). The interference replica h _{n, m} is
ICU14 provided for the next stage
It is the same as FIG. 2 in that it is supplied to b- (n + 1) -m.

In this configuration, instead of the error signal, the baseband signal _Rb with a required delay is input to the adders 18b-n provided at each stage. In addition, the signal given a negative sign and input to the adder 18b-n is the interference residual estimation signal en _{, m} in FIG. 2, whereas the interference cancellation device 10b shown in FIG. Is the interference replica spread signal H _{n, m} . This interference replica spread signal H _{n, m} is obtained by re-spreading the interference replica h _{n, m} with the spreading code of the corresponding user and RAKE combining the same.

FIG. 7 shows an ICU 14 for performing interference removal processing for a main user in the interference canceling device 10b.
FIG. 3 is a diagram illustrating a configuration of bnm (m ≠ M). 3 is different from the ICU 14-nm (m ≠ M) shown in FIG.
_{n-1 and m} are not supplied to the latter-stage finger 42a. That is, in the latter-stage finger 42a, the multiplier 4
4 is not provided with an adder 46 at the subsequent stage.
Is re-spread with the spreading code used in. As a result, the signal of each path obtained by re-spreading the interference replica h _{n, m} is added by the adder 50. Then, the result of the addition is output from the terminal 70b as an interference replica spread signal H _{n, m} . The point that the information symbol obtained by the hard decision unit 40 is supplied to the other interference canceling device 10 via the bus 3 and the signal relay unit 4, and the received symbol generated for the sub-user in the other interference canceling device 10. Is input via the bus 3 and the signal relay unit 4 and is input to the path selection unit 37, similarly to the ICU 14-nm (m ≠ M) shown in FIG.

FIG. 8 is a block diagram showing an ICU 14b for performing interference cancellation processing for a sub-user in the interference canceling apparatus 10b.
It is a figure showing composition of nM. ICU 14b shown in FIG.
-NM, the ICU14-n- shown in FIG.
The difference from M is that the interference replica hn _{-1, m} supplied to the adder 32 is not provided to the subsequent finger 42a. The received symbol generated by the first-stage finger 28 is transmitted via the bus 3 and the signal relay unit 4 to a main user IC provided in another interference canceling apparatus 10.
U14b-nm (m ≠ M) which is supplied to the same user registered, and its ICU1
The point that information symbols are returned from 4b-nm (m ≠ M) is the same as that of ICU 14-n-M shown in FIG.

The interference canceling device 10b shown in these figures is replaced with the interference canceling device 1 shown in FIG.
Even if it is used as 0A to 10H, it is possible to reduce the influence of the main user on a neighboring sector when the demodulated signal of the main user is to be generated by registering the user as a sub-user.

Embodiment 4 FIG. 9 is a diagram showing a configuration of an interference cancellation apparatus according to Embodiment 4 of the present invention.
The interference cancellation apparatus 10c shown in FIG.
Is used in place of the interference canceling device 10 shown in FIG. The interference cancellation device 10c shown in FIG. 1 includes a first stage 12c-1 and a second stage 12c-2. Although not shown in the figure, up to the N-th stage is provided. The first stage 12c-1 receives a baseband signal _Rb in which a plurality of user signals are code-division multiplexed, and reduces mutual interference between the user signals,
From the N stage, the demodulated signal R _m for registration main user is output. Also, the interference canceling device 10c
Although not shown, a level ranking circuit 20 is provided similarly to the interference canceling apparatus 10a according to the second embodiment. Thus, the signal levels of the user signals related to the first user to the M-th user are ranked, and the ICUs 14c-n-1 to 14c are arranged in each stage in order from the user having the higher signal level to the user having the lower signal level.
-N-M. Also in this interference canceling device 10c, the registered users include a main user and a sub-user. Here, since the signal level of the sub-user is often low, regardless of the ranking by the level ranking circuit 20,
The sub-user may be assigned to the lower ICU 14c-nm. Here, the lowest ICU 14c-
Description will be made assuming that sub-users are assigned to nM.

In the first stage 12c-1, ICUs 14c-1-1 to 14c-1-M corresponding to each of M users (main users and sub-users) are connected in parallel. The ICU 14c-nm outputs a signal component related to the m-th user included in the input spread signal as an interference replica spread signal H _{n, m} . ICU14c
The adder 18c-1 is provided at the preceding stage of -1-2 to 14c-1-M.
−2 to 18c-1-M are connected, and further, delay elements 16c-1-2 to 16c-1-M are connected at the preceding stage.
The adder 18c-1-m receives the baseband signal _Rb via the delay element 16c-1-m with the same code and the interference replica spread signal relating to the first to (m-1) th users. H _{1,1 to} H _{1, m-1} are input with a negative sign (2 ≦ m ≦ M). The delay element 16c-1-m is an IC
The time from when the signal processing of U14c-1-1 to 14c-1- (m-1) is completed and the interference replica spread signals H _{1,1 to} H _{1, m-1} are completed, the baseband signal _Rb It gives a delay. Further, a delay element 11-1 is provided in the first stage 12c-1. The delay element 11-1
Is I after signal processing in ICU14c-1-1 starts.
The delay is applied to the baseband signal _Rb until the signal processing in the CU 14c-1-M is completed.
The output of the delay element 11-1 is supplied to the second stage 12c-2.

Also in the second stage 12c-2, the ICUs 14c-2-1 to ICU14c-2-1 correspond to each of the M users.
4c-2-M are provided in parallel connection. IC
An adder 18c-2-m is connected in front of the U14c-2-m, and in particular, the adders 18c-2-2 to 18c-2
Regarding −M, the delay elements 16c-2-2 to
16c-2-M is connected. Adder 18c-2-
1, a baseband signal _Rb output from the delay element 11-1 is input to the first stage 12c.
The interference replica spread signals H _{1,2 to} H _{1, M} generated at −1 are input with a negative sign. In this way, the adder 18c-2-1 generates a signal obtained by subtracting the interference replica spread signals H _{1,2 to} H _{1, M} related to the users other than the first user from the baseband signal _Rb . ICU14c-
This signal is input to 2-1 as a basic signal for generating the interference replica spread signal H _2,1 . on the other hand,
The baseband signal _Rb via the delay element 11-1 and the delay element 16c-2-m is input to the adder 18c-2-m, and an interference replica spread signal related to a user other than the m-th user is input. H _{n, m ′} (n is 1 or 2; m ′ ≠
m) is input with a minus sign (2 ≦ m ≦
M). Specifically, the adder 18c-2-m includes the interference replica spread signal H generated in the second stage 12c-2.
_{2,1 to} H _{2, m-1} and the interference replica spread signals H _{1, m + 1 to} H _{1, M} already generated in the first stage 12c-1 are given negative signs and input. I have. In short, ICU14c
−nm, the latest spread replica spread signal H _{n, m} (n is 1 or 2; m ′ ≠) related to a user other than the m-th user already obtained at the time of starting the interference cancellation processing there.
m) is subtracted from the baseband signal _Rb . As a result, the accuracy of the interference replica spread signal H _{n, m} is improved each time the stages are overlapped.

Here, the delay element 16c-2-m is an IC
The time from when the signal processing of U14c-2-1 to 14c-2- (m-1) is completed and the interference replica spread signals H _{2,1 to} H _{2, m-1} are obtained, the delay element 11-1 This is to further delay the output baseband signal _Rb . The second stage 12c-2 includes a delay element 11
-2 is provided. The delay element 11-2 is an ICU
ICU14 after signal processing in 14c-2-1 has started
Until the signal processing in c-2-M is completed, a further delay is given to the baseband signal _Rb . The output of the delay element 11-2 is supplied to the next stage. First
And similarly interference removing process until the final stage is advanced to the second stage, in the final of the N-stage interference replica spreading signal H _n, instead of _m, the demodulated signal R _m for each main user is output.

In each stage, ICU14c-nm
(M ≠ M) is assigned to a main user. Further, a sub-user is assigned to the ICU 14c-n-M. FIG. 10 shows the ICU 14c for the main user.
The configuration of −nm (m ≠ M) is shown.

The ICU 14c-nm (m
≠ M) is different from the ICU 14 shown in FIG. 3 in that the adder 32 is not provided on the front-stage finger 28b, and the terminal 66 is not provided accordingly. further,
The second stage finger 42b is also different in that the adder 46 is not provided and the output of the multiplier 44 is supplied to the spreading section 48 as it is. Thus, the terminal 70c outputs the interference replica spread signal H _{n, m} . Embodiments 1 to 3 are different from Embodiments 1 to 3 in that a reception symbol is supplied to the path selection unit 37 from another interference cancellation device 10c and that an information symbol obtained by the hard decision unit 40 is supplied to another interference cancellation device 10c. This is the same as Embodiment 3.

FIG. 11 shows the configuration of the ICU 14c-nM for performing the interference removal processing for the sub-user. The ICU 14c-nM shown in the figure performs an interference removal process relating to the sub-user, and is configured to include the front stage finger 28b and the rear stage finger 42b. They are the first finger 28b and the second finger 42b.
b is the ICU 14c for the main user shown in FIG.
Same as nm (m ≠ M). Then, the received symbol generated by the front-stage finger 28b is supplied to another interference canceling device 10c via the bus 3 and the signal relay unit 4, and the information symbol generated by the other interference canceling device 10c is transmitted to the bus 3 and the signal It is similar to the first to third embodiments in that it is provided to the rear finger 42b via the relay unit 4.

The interference canceling apparatus 1 having the above configuration
Even if 0c is used in place of the interference cancellation device 10 shown in FIG. 2, the interference cancellation processing can be performed not only for the main user but also for the sub-user. At this time, signal processing for the sub-user is performed for the main user by 14c-n
This is performed by diverting information symbols obtained from −m (m ≠ M). As a result, although it is considered that the baseband signal input to the interference cancellation apparatus 10c registered with the sub-user does not include many signal components related to the sub-user, information obtained by signal processing regarding the main user is obtained. By diverting the symbols to the signal processing for the sub-user, it is possible to preferably perform the interference removal processing for the sub-user.

Embodiment 5 FIG. 12 is a diagram showing an overall configuration of a CDMA base station apparatus according to Embodiment 5 of the present invention. The CDMA base station device 100 shown in FIG. 1 has an eight-sector configuration, and sector antennas 6A to 6H are provided in each sector. These sector antennas 6A-6
H are connected to receiving units 2A to 2H, perform frequency conversion and quadrature detection on signals received by each sector antenna 6, and output baseband signals. The baseband signals output from the receiving units 2A to 2H are supplied to the searcher 5a and the real-time processing unit 104. The searcher 5a sequentially matches all spread codes to be processed with the baseband signal supplied from each reception unit 2, and detects a multipath timing (symbol timing) and a correlation value. Then, for each user, a predetermined number of baseband signals (sectors) and multipath timings for which a high correlation value is obtained are selected, and the sector information, the multipath timing and the information indicating the correlation value are transmitted to the sector distribution unit 106 and the multipath control. To the unit 102. Multipath control unit 102
Determines which multipath timing user signal of the baseband signal supplied from which receiver 2 should be synthesized based on the information supplied from the searcher 5a,
The contents of the decision are passed to the real-time processing unit 104 on the multipath control signal. That is, the multipath control signal is used to determine which multipath timing of the baseband signal output from the receiver 2 of which sector is RAK for all users.
This is a signal indicating whether the information symbols should be subjected to the E-combination and the provisional determination of the information symbol should be performed.

The real-time processing unit 104 generates information symbols for each user from the baseband signal supplied from the receiving unit 2 based on the multipath control signal, and the transmission path information used as a basis for generating the information symbols. Generate These information symbols and transmission path information are supplied to the sector distribution unit 106. As described above, the sector distribution unit 10
6, sector information, multipath timing, and correlation values are registered for each user from the searcher 5a. In the sector distribution unit 106, based on these information,
For each sector, it is determined which sector should be registered as a main user and which sector should be registered as a sub-user. This decision is supplied to each high-speed processing section 116 as a sector distribution signal. Further, according to the content of the determination, the information symbol and the transmission path information output from the real-time processing section 104 are transferred to the high-speed processing sections 116A to 116H. At this time, the information symbol is supplied to the high-speed processing unit 116 registered as a user as either a main user or a sub-user. On the other hand, regarding transmission path information,
The transmission path information is determined for which baseband signal of which sector, and is distributed to the corresponding high-speed processing unit 116. For example, the real-time processing unit 104 combines two paths included in the baseband signal output from the receiving unit 2A and three paths included in the baseband signal output from the receiving unit 2B. When the information symbol is obtained, the transmission path information on the two paths obtained in the process is sent to the high-speed processing unit 116A,
The transmission path information on the above three paths is stored in the high-speed
Sent to B. The information symbols are sent to both high-speed processing sections 116A and 116B.

The high-speed processing unit 116 has a corresponding receiving unit 2
, A baseband signal is input via a real-time processing unit 104. Then, the high-speed processing unit 116 separates and extracts the demodulated signal related to the registered main user from the input baseband signal. At this time, the high-speed processing unit 116
It is configured to include a plurality of U (MICU and SICU), and by cooperating with each other, mutual interference between the main user and the sub-user is reduced.

The high-speed processing units 116A to 116H are connected to each other by buses 112 and 114 so that they can communicate with each other. The bus 112 is connected to a first channel sorting unit 108, and the bus 114 is connected to a second channel sorting unit 110. The multi-path control signal output from the multi-path control unit 102 is input to the first channel classification unit 108. This multipath control signal is also supplied to the second channel classification unit 110. And the first
In the channel classification unit 108, any of the high-speed processing units 11
When a received symbol for the registered sub-user is generated at 6 and transmitted to the bus 112, the received symbol is transferred to the high-speed processing unit 116 registered as the main user. On the other hand, the second channel separation unit 1
When the information symbol for the main user is generated by any one of the high-speed processing units 116 and transmitted to the bus 114, the information symbol is sent to the high-speed processing unit 116 in which the same user is registered as a sub-user. Forward.
The information symbols obtained by the signal processing for the main user are diverted to the signal processing for the sub-user, so that the reliability of the signal processing for the sub-user can be improved. In addition, the reliability of the signal processing for the main user can be improved by using the received symbols obtained by the signal processing for the sub-user for the signal processing for the main user.

FIG. 13 is a diagram showing the configuration of the real-time processing unit 104. As shown in the figure, the real-time processing unit 104 includes ICUs 118-1 to 118-J. Here, “J” corresponds to the number of users who can be managed by the CDMA base station apparatus 100. Each IC
All baseband signals output from the receiving unit 2 are input to U118. A multipath control signal supplied from the multipath control unit 102 is also input to each ICU 118, and a baseband signal of each sector is appropriately selected based on the multipath control signal, and the selected baseband signal , An information symbol and transmission path information are generated.

FIG. 14 is a diagram showing a configuration of ICU 118 included in real-time processing section 104. As shown in the figure, the ICU 118 has a finger 132 and a RAK.
It is configured to include an E combining unit 38 and a hard decision unit 40. The finger section 132 includes a sector switching section 134, a despreading section 30, a transmission path estimating section 34, and a multiplier 36. A baseband signal group is input to the sector switching unit 134 from the terminal 130. That is, all the baseband signals output from the receiving unit 2 are temporarily input to each finger unit 132. The sector switching section 134 selects one of the baseband signals for each finger section 132 based on the multipath control signal supplied from the multipath control section 102, and supplies the baseband signal to the despreading section 30 at the subsequent stage. ing. The despreading unit 30 is also supplied with a multipath control signal from the multipath control unit 102. Then, the baseband signal output from the sector switching unit 134 is matched with the spreading code specified by the multipath control signal at the multipath timing specified by the multipath control signal, and despreading is performed. The despread signal output from the despreading section 30 is
, And also to the multiplier 36. The transmission channel estimation unit 34 estimates the transmission channel for each path based on the output of the despreading unit 30, and outputs transmission channel information. The conjugate signal of the transmission path information is input to the multiplier 36, where a signal in which the phase difference and the signal level difference generated in the transmission path are canceled, that is, a received symbol is generated. The received symbol of each path is stored in the RAKE combining unit 3.
8 where the RAKE synthesis is performed. RAK
The combined symbol obtained by the E-combination is supplied to the hard decision unit 40, where the most probable transmission symbol for each user, that is, the information symbol, is provisionally determined and supplied to the sector distribution unit 106. I have. Also,
The transmission path information output from the transmission path estimating section 34 is also supplied to the sector distribution section 106.

Next, FIG. 15 is a diagram showing the configuration of the high-speed processing section 116. As shown in FIG.
Are the error signal memory 120 and the interference replica memory 12
2, MICU 124-1 to 124-M, and SICU 1
26-1 to 126-M 'and an adder 128. The MICU 124 performs signal processing for the main user, and “M” corresponds to the number of main users that can be registered. The SICU 126 performs signal processing on sub-users, and “M ′” corresponds to the number of sub-users that can be registered.

The MICU 124, SICU 126 and adder 128 correspond to the interference canceling device 10 shown in FIG.
Corresponds to the ICU 14-nm for one certain stage. And MI for these one stage
By repeatedly using the CU 124, the SICU 126, and the adder 128 at high speed, interference removal processing for a plurality of stages is performed. That is, the MICU 124 is supplied with information symbols, transmission path information, and sector distribution signals from the sector distribution unit 106, and based on these signals, the first
Perform interference removal processing on the stage. That is, MICU
When the operation is performed in the first stage, the operation of the ICU 14 shown in FIG. And from MICU124,
The interference replica and the interference residual estimation signal are output, and the interference replica is supplied to the interference replica memory 122. On the other hand, the interference residual estimation signal is supplied to the adder 128 with a negative sign.

The SICU 126 also has the sector distribution unit 106
, An information symbol, transmission path information, and a sector distribution signal are provided. In the first stage, an interference residual estimation signal and an interference replica are generated based on these signals. These interference residual estimation signals and interference replicas relate to sub-users. The interference residual estimation signal for the sub-user is also given a negative sign and supplied to the adder 128. In addition, an interference replica for the sub-user is also supplied to the interference replica memory 122. The adder 128 includes
The error signal already stored in the error signal memory 120 is also supplied with the same sign. The error signal already stored in the error signal memory 120 has been generated in the previous stage. In the first stage, the error signal memory 120 stores the baseband signal _Rb . Then, the adder 128 subtracts all the interference residual estimation signals from the error signal or the baseband signal _Rb, and generates a new error signal. This error signal is overwritten in the error signal memory 120. The error signal stored in the error signal memory 120 is also supplied to the MICU 124 and the SICU 126. Then, the interference replica stored in the interference replica memory 122 is also M
It is supplied to the ICU 124 and the SICU 126. M
In the second and subsequent stages, the ICU 124 and the SICU 126 continuously generate an interference residual estimation signal and an interference replica based on these signals. Then, in the final stage, MICU124 outputs a demodulated signal R ₁ to R _M for registration main user. These demodulated signals R _m is used in the higher-level device of the base station (not shown).

FIG. 16 is a diagram showing the configuration of the MICU 124. As shown in the drawing, the MICU 124 includes a pre-stage finger 28, a path selecting unit 37, and a RAKE combining unit 38.
, A hard decision unit 40, switches 136 and 138, a post-finger 42, and an adder 50. The first-stage finger 28 includes a despreading unit 30 and an adder 32.
, A transmission path estimating unit 34, and a multiplier 36, and are the same as those included in the ICU 14 shown in FIG. In addition, the latter-stage finger 42 is connected to the multiplier 4
4, the adder 46, and the spreading unit 48, and are the same as those included in the ICU 14 shown in FIG. What is unique about MICU 124 is that
A switch 136 is provided at a stage subsequent to the hard decision unit 40, and information symbols output from the hard decision unit 40 and information symbols output from the real-time processing unit 104 are selectively supplied to the subsequent stage finger 42. It is. That is, a switching signal is supplied from a control device (not shown) to the switch 136. When the switch 136 is used as the first stage, the information symbol supplied from the real-time processing unit 104 is supplied to the subsequent finger 42, In, the information symbols output from the hard decision section 40 are supplied to the subsequent finger 42. Further, a switch group 138 is provided at a stage subsequent to the transmission path estimating unit 34. A plurality of switch groups 138 are provided according to the multipath.
Each switch belonging to the switch group 138 includes, in addition to the transmission path information output from the previous-stage finger 28, the real-time processing unit 1
The transmission path information supplied from the real-time processing unit 104 is supplied to the subsequent finger 42 in the first stage based on a switching signal supplied from a control device (not shown). After the second stage, the transmission path information output from the preceding finger 28 is supplied to the subsequent finger 42. That is, in the first stage, the information symbol and the transmission path information output from the real time
36, 138, and the second-stage finger 42
Supplied to The latter finger 42 generates an interference residual estimation signal e _{n, m} and an interference replica h _{n, m} based on these signals. The interference residual estimation signal en _{, m} is output from the terminal 70 and supplied to the adder 128. The interference replica hn _{, m} is output from the terminal 68, and the interference replica memory 1
22. That is, when the MICU 124 is used in the first stage, the processing is performed on the subsequent fingers 42 and thereafter.

In the figure, an error signal r _n−1 output from the error signal memory 120 is input to a terminal 64. The error signal r _n-1 input from the terminal 64 is supplied to the despreading unit 30 provided in the preceding finger 28.
The despreading unit 30 is supplied with a sector distribution signal from the sector distribution unit 106, and the spreading code and multipath timing are specified by the sector distribution signal. The despreading unit 30 despreads the error signal rn _{-1 with} the specified spreading code and multipath timing, and outputs the result to the adder 32. Subsequent processing is
This is the same as the ICU 14 shown in FIG. Front finger 28
Are supplied to the path selection unit 37, and the path selection unit 37 further receives the SICU12
The received symbol generated in 6 is input via the bus 112 and the first channel classification unit 108. That is, the SICU 126 transmits a received symbol relating to a sub-user to the bus 112, and the first channel discriminating unit 108 determines the transmitted received symbol by the same user as the main channel based on the multipath control signal. High-speed processing unit 116 registered as a user,
Specifically, the high-speed processing unit 116 supplies the data to the MICU 124 to which the same user is assigned. The received symbols are supplied to the path selection section 37, where path selection is performed. As a criterion for path selection in the path selection unit 37, for example, a predetermined number of received symbols are selected in descending order of signal level. Alternatively, all the paths are unconditionally supplied to the RAKE combining unit 38 at the subsequent stage.
The information symbol output from the hard decision unit 40 is sent to the bus 114, and is transmitted via the second channel classification unit 110 to the SICU 126 provided in another high-speed processing unit 116.
It is supplied to. That is, in the signal processing for the sub-user, the SICU 126 does not directly perform the temporary determination of the information symbol, but is generated by the MICU 124 provided in another high-speed processing unit 116 in which the same user is registered as the main user. Reuse information symbols. The second channel classification unit 110 converts the information symbol transmitted to the bus 114 based on the multipath control signal supplied from the multipath control unit 102 into the high-speed processing unit 1 in which the same user is registered as a sub-user.
16 and supplies the information symbol to the SICU 126 assigned to the same user contained therein.

FIG. 17 shows the high-speed processing unit 1 shown in FIG.
16 is a diagram illustrating a configuration of a SICU 126 included in the SICU 126. FIG.
The SICU 126 shown in the figure includes a plurality of fingers 142 and an adder 50. Finger 142
Are the despreading unit 30, the adders 32 and 46, and the transmission channel estimation unit 3.
4, multipliers 36 and 44, switches 144 and 146, and a spreading unit 48. The despreading unit 30
The error signal r _n-1 input from the terminal 64 is input. The error signal rn _-1 is supplied from the error signal memory 120. The despreading unit 30 includes the sector distribution unit 10
6, and the despreading process is performed with the spreading code and multipath timing specified by the sector distribution signal. The sector distribution signal is also supplied to the spreading unit 48, and the spreading unit 48 performs a re-spreading process with a spreading code and multipath timing specified by the sector distribution signal. Terminal 6
6, the interference replica h _{n−1, m} stored in the interference replica memory 122 is input. The interference replica hn _{-1, m} is supplied to the adder 32, and is also supplied to the adder 46 with a negative sign. The adder 32 adds the interference replica hn _{-1, m} and the output of the despreading unit 30, and adds the result to the transmission channel estimating unit 34 and the multiplier 3
6 and supply. In the multiplier 36, the transmission path estimation unit 3
The conjugate signal of the transmission path information generated in step 4 is multiplied by the output of the adder 32, and the received symbol of each path, which is the output, is transmitted to the bus 112. As described above, the received symbol is processed by another high-speed processing unit 116 corresponding to the first channel classification unit 108.
Is transferred to the MICU 124.

Fingers 142 include switches 144 and 14
6 are provided. The information symbol output from the real-time processing unit 104 is input to the switch 144, and the information symbol transferred from the MICU 124 of the other high-speed processing unit 116 by the second channel classification unit 110 is input to the switch 144. Then, based on a switching signal supplied from a control unit (not shown), the information symbol output from the real-time processing unit 104 is given to the subsequent multiplier 44 in the first stage, and the MICU 1
The information symbols supplied from 24 are provided to a multiplier 44 at the subsequent stage. Similarly, switch 146
Is input with the transmission path information output from the real-time processing unit 104, and is also input with the transmission path information generated by the transmission path estimating unit 34 included in the SICU 126. The switch 146 supplies the transmission path information supplied from the real-time processing unit 104 to the subsequent multiplier 44 in the first stage based on the switching signal supplied from the control unit (not shown), and transmits the transmission line information in the second and subsequent stages. The transmission path information generated by the path estimating unit 34 is supplied to a multiplier 44 at a subsequent stage. Therefore, in the first stage, the multiplier 44, the adder 46, the spreading section 48 and the adder 50 function, and in the second and subsequent stages, the finger 1
All of the 42 configurations function. Thus, terminal 70 outputs interference residual estimation signal e _{n, m} for the sub-user, and terminal 68 outputs interference replica h _{n, m} for the sub-user. Interference residual estimation signal e _{n, m} are supplied to the adder 128, the interference replica h
_{n and m} are stored in the interference replica memory 122 and prepared for use in the next stage.

CDMA according to Embodiment 5 described above
According to the base station apparatus 100, the reception symbol generated by the SICU 126 is
4 to be subjected to RAKE synthesis there. Therefore, when the information symbol is provisionally determined using the result of the RAKE combining, the accuracy can be improved. Further, the SICU126, interference residual estimation signal e _n by using the information symbols generated by MICU124 other high-speed processing unit _{116, m} and interference replica h _n, generation of _m is performed. Each high-speed processing unit 116 for sub-users
If the information symbols are to be provisionally determined, the accuracy of the provisional determination is considered to be low since the baseband signal of each sector contains only a low level of signal components related to sub-users. However, Embodiment 5
In the CDMA base station apparatus 100 according to the above, such a temporary determination is avoided, and the result of the
Since it is used at 126, a more accurate interference residual estimation signal e _{n, m} and interference replica h _{n, m} can be generated for the sub-user. For this reason, it is possible to preferably perform the interference removal processing for the sub-user.

Further, in the CDMA base station apparatus 100,
In the high-speed processing unit 116, the MICU 124, the SICU
126 and the adder 128 are repeatedly used over a plurality of stages. Therefore, the size of the apparatus can be reduced as compared with a case where circuits for each stage are separately provided.

Embodiment 6 FIG. FIG. 18 is a diagram showing an overall configuration of a CDMA base station apparatus according to Embodiment 6 of the present invention. The CDMA base station device 100a shown in FIG.
2 differs from the CDMA base station apparatus 100 already shown in FIG. First, the real-time processing unit 104a
The difference is that received symbols are supplied to the channel classification unit 108a. That is, the CDMA base station device 1
The real-time processing unit 104a provided in the real-time processing unit 104a is provided with ICUs 118a-1 to 118a-J as shown in FIG.
4 in that received symbols are output from each ICU 118a and the received symbols are supplied to the first channel classification unit 108a. Second,
The difference is that the first channel classification unit 108a supplies the received symbol received from the SICU 126 or the real-time processing unit 104a to the MICU 124 of the next stage. Thus, with one stage delay, the received symbols are processed by the real-time processing unit 1.
By transferring the received symbol from the SI 04a or the SICU 126 to the MICU 124, the transfer time of the received symbol having a large data amount can be increased, and the system design can be simplified.

FIG. 20 is a diagram showing a configuration of the ICU 118a provided in the real-time processing section 104a. The ICU 118a shown in the figure is different from the ICU 118 already shown in FIG. 14 in that the output of the multiplier 36 is supplied to the RAKE combiner 38 and is output to the outside. This externally output received symbol is supplied to the first channel
8a. In the first channel separation unit 108a,
When receiving a received symbol from the ICU 118a included in the real-time processing unit 104a, the received symbol related to the sector registered as a sub-user among the received symbols is transferred to the high-speed processing unit 116 which has registered the same user as a main user. I do. In the transfer of the received symbols, the received symbols obtained from the real-time processing unit 104a are supplied to the MICU 124 in the second stage, and the received symbols obtained from the SICU 126 in the second stage are transmitted to the MICU 124 in the third stage.
124. Thus, in MICU124,
The received symbols related to the sub-user generated in the immediately preceding stage are received, and the information symbols are temporarily determined using the received symbols. In this way, a time allowance for receiving symbol transfer is provided only for one stage processing time, so that system design can be simplified.

That is, in CDMA base station apparatus 100 according to Embodiment 5, the received symbols supplied to MICU 124 via first channel discriminating section 108 are subjected to parallel-serial conversion in order to reduce the number of wires, for example. Thereafter, it is desirable that the data be sent to the bus 112 at a high speed.
However, as the number of bits of symbol data, the number of data channels, and the symbol rate increase, the data amount of the received symbols transmitted to the MICU 124 increases, and higher-speed transfer processing is required. In CDMA base station apparatus 100a according to Embodiment 6, MIC
Since the received symbol already generated in the previous stage is supplied to U124, the received symbol is transmitted to the MICU 124 of the next stage even while the interference replica hn _{-1, m} is being generated in the previous stage. Can be sent. For this reason, it has succeeded in avoiding difficulties in hardware configuration.

Since the received symbols supplied to MICU 124 are generated in the previous stage, the received symbols generated in the same stage are
There is a possibility that the reliability of the signal processing in the MICU 124 is degraded as compared with the case where the signal is supplied to the MICU 124. FIG.
1 includes a MICU 124 according to a modification of the MICU 124.
The configuration of a is shown. MICU12 shown in the figure
4a in the high-speed processing unit 116 shown in FIG.
It is used in place of MICU 124-1 to 124-M. MICU1 shown in the figure
In 24 a, a multiplier 152 and a weight coefficient supply unit 150 are provided in a stage preceding the path selection unit 37. And SI
For the received symbol supplied from the CU 126 via the first channel classification unit 108a, the multiplier 152
Is multiplied by a weight coefficient α of less than and supplied to the path selection unit 37. In this way, the MICU 124a treats the inferior received symbol as inferior to the received symbol generated by the preceding finger 28.
Can improve the accuracy of the tentative determination performed in step (1).

Embodiment 7 FIG. FIG. 22 is a diagram showing an overall configuration of a CDMA base station apparatus according to Embodiment 7 of the present invention. The CDMA base station device 100b shown in FIG.
2 differs from the CDMA base station apparatus 100 shown in FIG. 2 in the configuration and operation of the real-time processing unit 104b, the first channel classification unit 108b, the second channel classification unit 110b, and the high-speed processing unit 154. The real-time processing unit 104b has the same configuration as the real-time processing unit 104a shown in FIG. 19, and in particular, the ICU 11 shown in FIG.
8b is used. That is, the ICU 118
In b, the output of the hard decision unit 40 is supplied to the sector distribution unit 106 and is output to the outside. Further, the transmission path information generated by the transmission path estimating section 34 is also supplied to the sector distribution section 106 and output to the outside. These externally output information symbols and transmission line information are
The signal is supplied to the channel sorting unit 108b. Next, the high-speed processing unit 154 is different from the high-speed processing unit 116 shown in FIG. 15 in that the MICU 124 shown in FIG.
CU124b is used, and SICU126
In that SICU 126b shown in FIG. 25 is used instead of. MICU 124b is different from MICU 124 shown in FIG. 16 in that a multiplier 152, a weighting factor supply unit 150, and an equivalent symbol generation unit 156 are provided in a stage preceding path selection unit 37. The equivalent symbol generation section 156 generates an equivalent symbol that is substantially equivalent to the received symbol based on the transmission path information and the information symbol supplied from the first channel classification section 108b. This equivalent symbol is supplied to the multiplier 152, and is multiplied by a weight coefficient α less than 1 output from the weight coefficient supply unit 150. The multiplication result is supplied to the path selection unit 137.

On the other hand, SICU 126b shown in FIG.
In the finger 142b, the multiplier is not provided at the subsequent stage of the adder 32 in the finger 142b, and the received symbol is not generated. In this SICU 126b, instead of transmitting the received symbol to the bus 112, the transmission path estimating section 34
Is transmitted to the bus 112 as it is. Since the transmission path estimation information is generated for each of a fixed number of symbols based on a fixed number of symbols, one transmission path estimation information is supplied to the channel classification unit 108b for each of the fixed number of symbols. I suffice. For this reason, by transmitting the transmission path information instead of the reception symbol, the amount of data transmitted on the bus 112 can be suppressed, and the hardware configuration can be simplified.

More specifically, the first channel sorting section 108b
Now, the ICU 118b included in the real-time processing unit 104b
Are supplied to the MICU 124b of the second stage. The transmission path information generated by the second stage SICU 126b is transmitted to the second stage MICU by the first channel classification unit 108b.
Paired with the information symbol generated by the CU 124b,
It is supplied to the MICU 124b in the third stage.
As described above, the first channel classification unit 108b sets the transmission path information generated in the previous stage and the information symbol corresponding to the transmission path information, and
To supply. The MICU 124b generates an equivalent symbol based on the pair of the transmission line information and the information symbol, multiplies the equivalent symbol by a weight coefficient α of less than 1, and supplies the multiplied symbol to the path selection unit 37.

In this manner, as described above, the transmission path estimation information has a small amount of data to be actually transferred, and furthermore, the information symbol has a small number of bits. . As a result, the hardware configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a CDMA base station apparatus according to Embodiment 1 of the present invention.

FIG. 2 is a diagram illustrating a configuration of an interference cancellation device used in the CDMA base station device according to Embodiment 1 of the present invention.

FIG. 3 is a diagram showing a configuration of an ICU for a main user according to Embodiment 1 of the present invention.

FIG. 4 is a diagram showing a configuration of an ICU for a sub-user according to Embodiment 1 of the present invention.

FIG. 5 is a diagram showing a configuration of an interference cancellation device used in a CDMA base station device according to Embodiment 2 of the present invention.

FIG. 6 is a diagram illustrating a configuration of an interference cancellation apparatus used in a CDMA base station apparatus according to Embodiment 3 of the present invention.

FIG. 7 is a diagram showing a configuration of an ICU for a main user according to Embodiment 3 of the present invention.

FIG. 8 is a diagram showing a configuration of an ICU for a sub-user according to Embodiment 3 of the present invention.

FIG. 9 is a diagram showing a configuration of an interference cancellation device used in a CDMA base station device according to Embodiment 4 of the present invention.

FIG. 10 is a diagram showing a configuration of an ICU for a main user according to Embodiment 4 of the present invention.

FIG. 11 is a diagram showing a configuration of an ICU for a sub-user according to Embodiment 4 of the present invention.

FIG. 12 is a diagram showing an overall configuration of a CDMA base station apparatus according to Embodiment 5 of the present invention.

FIG. 13 is a diagram illustrating a configuration of a real-time processing unit of a CDMA base station apparatus according to Embodiment 5 of the present invention.

FIG. 14 is a diagram showing a configuration of an ICU provided in a real-time processing unit according to Embodiment 5 of the present invention.

FIG. 15 is a diagram showing a configuration of a high-speed processing unit of a CDMA base station apparatus according to Embodiment 5 of the present invention.

FIG. 16 is a diagram showing a configuration of an MICU provided in a high-speed processing unit of a CDMA base station apparatus according to Embodiment 5 of the present invention.

FIG. 17 is a diagram showing a configuration of a SICU provided in a high-speed processing unit of a CDMA base station apparatus according to Embodiment 5 of the present invention.

FIG. 18 is a diagram illustrating an overall configuration of a CDMA base station apparatus according to Embodiment 6 of the present invention.

FIG. 19 is a diagram showing a configuration of a real-time processing unit of a CDMA base station device according to Embodiment 6 of the present invention.

FIG. 20 is a diagram showing a configuration of an ICU provided in a real-time processing unit according to Embodiment 6 of the present invention.

FIG. 21 is a diagram illustrating a configuration of an MICU provided in a high-speed processing unit of a CDMA base station apparatus according to Embodiment 6 of the present invention.

FIG. 22 is a diagram illustrating an overall configuration of a CDMA base station apparatus according to Embodiment 7 of the present invention.

FIG. 23 is a diagram showing a configuration of an ICU provided in a real-time processing unit according to Embodiment 7 of the present invention.

FIG. 24 is a diagram illustrating a configuration of an MICU provided in a high-speed processing unit of a CDMA base station apparatus according to Embodiment 7 of the present invention.

FIG. 25 is a diagram illustrating a configuration of a SICU provided in a high-speed processing unit of a CDMA base station device according to Embodiment 7 of the present invention.

FIG. 26 is a diagram illustrating a configuration example of a CDMA base station apparatus according to the related art.

[Explanation of symbols]

1, 100, 100a, 100b CDMA base station device, 2 receiving unit, 3, 112, 114 bus, 4 signal relay unit, 5 searcher, 6 sector antenna, 10, 1
0a, 10b, 10c Interference cancellation device, 12, 1
2a, 12b, 12c stage, 14, 14a, 14
b, 14c, 118, 118a, 118b ICU, 1
6, 16a, 16b, 16c, 11 delay elements, 18,
18a, 18b, 18c, 32, 46 adders, 28
Pre-finger, 30 despreading unit, 34 transmission channel estimation unit,
36,44 Multiplier, 37 pass selector, 38,50
RAKE synthesis unit, 40 hard decision unit, 42 post-finger, 48 diffusion unit, 64, 66, 70, 70a, 70b
Terminals, 124, 124a MICU, 126, 126
a, 126b SICU, 136, 138, 144, 1
46 switch.

Claims (8)

[Claims] 1. A system comprising a plurality of first sector interference canceling units respectively associated with any registered main user belonging to a first sector registered main user group, and cooperation of the first sector interference canceling unit group. A first sector for separating and extracting a demodulated signal relating to a first sector registered main user group from a spread signal received by a first sector antenna while reducing mutual interference generated between the first sector registered main user groups. An interference canceling device, a plurality of second sector interference canceling units respectively associated with any of the registered main users belonging to the second sector registered main user group, and a sub interference canceling unit associated with a predetermined registered sub-user. The plurality of second sector interference cancellation units and the With the cooperation of the sub-interference canceling unit, the demodulated signal relating to the second sector registered main user group is transmitted to the second sector antenna while reducing the mutual interference between the second sector registered main user group and the registered sub user. A second sector interference canceling device for separating and extracting from the received spread signal, wherein at least one of the first sector interference cancel units is caused by the spread signal received by the first sector antenna or the spread signal. A temporary decision unit for temporarily determining an information symbol associated with the first sector registration main user associated with the first sector interference cancellation unit based on the signal; The same user is assigned as the registration sub-user and the first sector registration By performing signal processing based on the information symbols provisionally determined with respect to the in-user, the registered sub-users cooperate with the plurality of second sector interference canceling units so that the registered sub-users become the second sector registered main users. A CDMA base station apparatus, which reduces applied interference. 2. The CDMA base station apparatus according to claim 1, wherein, based on the spread signals received by the first and second sector antennas, a detection unit detects a correlation value between the spread signals and a predetermined spread code group. Means, and a user allocating means for allocating the registered sub-user based on a detection result by the detecting means. 3. The CDMA base station apparatus according to claim 1, wherein the sub-interference cancellation unit performs the registration based on a spread signal received by the second sector antenna or a signal resulting from the spread signal. A reception symbol generation unit configured to generate a reception symbol related to a sub-user for each path, wherein the provisional determination unit further includes the reception symbol, C. the information symbol relating to the corresponding first sector registered main user is provisionally determined based on the received symbol generated by the generating means.
DMA base station device. 4. The CDMA base station apparatus according to claim 3, wherein the plurality of first sector interference cancellation units have a multi-stage configuration, and the first sector interference cancellation unit includes the tentative determination unit in each stage except a head stage. A one-sector interference canceling unit is provided, and the plurality of second-sector interference canceling units and the sub-interference canceling unit also have a multi-stage configuration corresponding to a multi-stage configuration in the plurality of first sector interference canceling units; The sub-interference canceling unit is provided at each stage, and the provisional determination means is based on a reception symbol generated by the sub-interference canceling unit provided at the previous stage, and an information symbol related to a corresponding first sector registered main user. CDMA group characterized by temporarily determining Local equipment. 5. The CDMA base station apparatus according to claim 4, wherein the provisional determination unit generates the received symbol by comparing a spread signal received by the first sector antenna or a signal caused by the spread signal. A CDMA base station apparatus, wherein the received symbol generated by the means is treated as inferior, and the information symbol for the corresponding first sector registered main user is provisionally determined. 6. The CDMA base station apparatus according to claim 1, wherein the sub-interference cancellation unit performs the registration based on a spread signal received by the second sector antenna or a signal caused by the spread signal. Transmission path estimating means for estimating transmission path information for a sub-user for each path, wherein the tentative determination means includes: the information symbol tentatively determined by the tentative determination means; and transmission path information estimated by the transmission path estimation means. Including an equivalent symbol generation means for generating an equivalent symbol corresponding to a received symbol related to the registered sub-user for each path, in addition to a spread signal received by the first sector antenna or a signal resulting from the spread signal, Further, based on the equivalent symbol, the information symbol relating to the corresponding first sector registered main user is provisionally determined. CD, wherein the door
MA base station device. 7. The CDMA base station apparatus according to claim 6, wherein the plurality of first sector interference cancellation units have a multi-stage configuration, and the first sector interference cancellation unit includes the tentative determination unit in each stage except a first stage. A one-sector interference canceling unit is provided, and the plurality of second-sector interference canceling units and the sub-interference canceling unit also have a multi-stage configuration corresponding to a multi-stage configuration in the plurality of first sector interference canceling units; The sub-interference canceling unit is provided at each of the stages, and the equivalent symbol generation unit performs the registration sub-based on the basis of the transmission path information estimated at the previous stage and the information symbol tentatively determined at any stage. Equivalent symbol corresponding to the received symbol for the user A CDMA base station apparatus for generating a vol for each path. 8. The CDMA base station apparatus according to claim 7, wherein the provisional determination unit compares the equivalent symbol with a spread signal received by the first sector antenna or a signal caused by the spread signal. A CDMA base station apparatus, wherein the information symbol relating to the first sector registered main user is provisionally determined after being treated as inferior.