CN106685520B - Pilot signal generation method and device and CDMA uplink synchronisation method and device - Google Patents
Pilot signal generation method and device and CDMA uplink synchronisation method and device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2662—Arrangements for Wireless System Synchronisation
- H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
- H04B7/2678—Time synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/38—Demodulator circuits; Receiver circuits
- H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
- H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/0005—Synchronisation arrangements synchronizing of arrival of multiple uplinks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7073—Synchronisation aspects
- H04B1/7075—Synchronisation aspects with code phase acquisition
- H04B1/70754—Setting of search window, i.e. range of code offsets to be searched
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Abstract
The invention discloses a kind of pilot signal generation method and devices and CDMA uplink synchronisation method and device.The pilot frequency creating method includes: according to the first matrix W=[Wan Wan…Wan] and scrambler sequence P, obtain the single pilot signal of i-th of user equipmentAccording to the single pilot signal Pilot of i-th of user equipmentiConstruct the pilot signal Pilot more than j-th of i-th of user equipmentij, K≤n, Piloti,j=Piloti*Cij, K > n, Piloti,j=Piloti*CI (j%n), i≤n, j=1~K, CijFor WanI-th row jth column bit, K and j are positive integer, and K is the quantity of more pilot signals.Technical solution provided by the invention distributed insertion pilot signal in the frame signal of user equipment, so that base station accurately quickly carries out channel estimation.
Description
Technical field
The present embodiments relate to wireless communication technology field more particularly to a kind of pilot signal generation method and device and
CDMA uplink synchronisation method and device.
Background technique
CDMA (Code Division Multiple Access, CDMA) is based on the basis of spread spectrum technic
A kind of communication for having many advantages, such as low strong antijamming capability, good confidentiality, power spectral density, networking flexibility to grow up
Technical system has been widely used for 2G, 3G and other wireless communication fields.The common multiple users of CDMA technology uplink
The asynchronous arrival receiver side of the signal of terminal transmission, has lost its orthogonality, causes being remarkably decreased and connecing for power system capacity
Receipts machine complexity greatly improves.
The it is proposed of synchronization CDMA greatly alleviates this problem, and is applied in the systems such as SCDMA, TD-SCDMA.
Each terminal signaling of synchronous CDMA system uplink guarantees synchronous or plesiochronous arrival base station side, between code channel it is orthogonal or it is quasi- just
It hands over, reduces and interfere between code channel, greatly improve power system capacity.Meanwhile terminal signaling orthogonality makes the synchronization of receiver, solution
Expansion, demodulating algorithm greatly simplify, and reduce the complexity of receiver.
How to guarantee that each terminal uplink signal synchronously arrives at base station, is emphasis and difficulty during synchronization CDMA technical application
Point.General synchronous CDMA system mostly uses the special time period period to send synchronization signal or using user uplink pilot frequency with reference to letter
Number carry out upstream synchronous timing estimation.There are two types of the mode of uplink synchronous cdma system progress uplink synchronization tracking is general.One
Kind is user using fixed time slot timesharing periodicity sending uplink synchronizing signals, such as SCDMA system.Another kind is that direct utilize is held
Carry pilot reference signal on a traffic channel, such as TD-SCDMA system.
It needs multi-subscriber time shared using a certain time interval resource in the way of period transmission uplink synchronizing signals, works as user volume
User's transmission uplink synchronizing signals time interval is longer when more, and in certain high-speed mobiles, user's synchronous adjustment speed can
It can be difficult to meet the speed of synchronous variation.In addition, specific uplink synchronizing signals are generally only used to carry out uplink synchronization tracking dimension
Operation is held, a large amount of running time-frequency resources are occupied, causes the waste of power system capacity.Uplink synchronous is carried out using user's pilot reference signal
Tracking, generally requires user's pilot signal and has good autocorrelation performance and cross correlation.
Existing system generally uses the longer continuous pilot signal of centralization, is used to carry out to provide higher freedom degree
Sequence search, search meet the signal sequence of system requirements, reach preferable correlation properties to meet uplink channel estimation and determine
When, offset estimation requirement.Synchronous CDMA system in order to guarantee the reliability and higher power system capacity of multi-user's uplink synchronous,
It will limit the number of users of single carrier carrying under normal circumstances, single user spread spectrum coefficient is not too high.For certain synchronization CDMAs
Application scenarios, under rate is lower or power limited situation, system design mostly uses the list for not dividing time slot compared with low bit piece rate
One code division multiple access format.In this way can number of users excessive to avoid single carrier when synchronous difficulty increase.Meanwhile single CDMA
Form guarantees that terminal transmitter works long hours, and reduces the transmission power requirement of single terminal, simplifies system design.For this
Kind situation, centralized pilot tone generally concentrate on certain time period, it is more difficult to which the channel shorter to coherence time is accurately estimated
Meter.Meanwhile when using a pilot for offset estimation, the precision of estimated value is generally inversely proportional to the time interval of pilot signal, concentrates
Formula pilot tone general persistence is limited, is unfavorable for obtaining accurate offset estimation value.Distributed pilot form can be preferable
It solves the above problems, but distributed pilot is faced with that single pilot length is limited, how to find leading of meeting that every estimation requires
Frequency sequence is the important problem faced.This just needs a kind of design method for distributed pilot and its uplink synchronous maintenance side
Method, to cope with a variety of application demands.
Summary of the invention
The present invention provides a kind of pilot signal generation method and device and CDMA uplink synchronisation method and device, passes through
Distributed insertion pilot signal, enables base station quickly and accurately to carry out channel estimation in the frame signal of user equipment.
In a first aspect, the invention discloses a kind of pilot signal generation methods, comprising:
According to the first matrix W=[Wan Wan…Wan] and scrambler sequence P, obtain the single pilot tone letter of i-th of user equipment
NumberWherein, WanFor the Walsh matrix of n row n column, W includes m WanMatrix, WiFor the i-th row vector of W, P
For the vector of 1 row n × m column, n is that user's maximum spreads multiple, and n × m is the number of chips that each pilot signal includes, m, n and i
It is positive integer, and i≤n, operatorIt is defined as WiWith P dot product；
According to the single pilot signal Pilot of i-th of user equipmentiI-th of user equipment are constructed to lead more
Frequency signal Pilotij, wherein as K≤n, the pilot signal Pilot more than j-th of i-th of user equipmenti,j=Piloti*Cij,
As K > n, the pilot signal Pilot more than j-th of i-th of useri,j=Piloti*CI (j%n), i≤n, j=1~K, CijFor
Walsh matrix WanThe i-th row jth column bit, K and j are positive integer, and K is the quantity of more pilot signals.
Second aspect, the invention also discloses a kind of CDMA uplink synchronisation methods, comprising:
Receive the frame signal that user equipment is sent, wherein distributed insertion institute in the frame signal that i-th of user equipment is sent
State more pilot signal Pilot of i-th of user equipmenti,j, j=1~K, more pilot signals of i-th of user equipment
Piloti,jTo be obtained according to any pilot signal generation method of first aspect, wherein i, j and K are positive integer；
According to more pilot signal Pilot of i-th of user equipmenti,jThe uplink for obtaining i-th of user equipment is fixed
When reference value.
The third aspect, the invention also discloses a kind of pilot signal generating means, comprising:
Single pilot signal generation module, for according to the first matrix W=[Wan Wan…Wan] and scrambler sequence P, it obtains
The single pilot signal of i-th of user equipmentWherein, WanFor the Walsh matrix of n row n column, W includes m
WanMatrix, WiFor the i-th row vector of W, P is the vector of 1 row n × m column, and n is that user's maximum spreads multiple, and n × m is each pilot tone
The number of chips that signal includes, m, n and i are positive integer, and i≤n, operatorIt is defined as WiWith P dot product；
More pilot signal generation modules, for the single pilot signal Pilot according to i-th of user equipmenti
Construct more pilot signal Pilot of i-th of user equipmentij, wherein as K≤n, the pilot tone more than j-th of i-th of user equipment
Signal Piloti,j=Piloti*Cij, as K > n, the pilot signal Pilot more than j-th of i-th of useri,j=Piloti*
CI (j%n), i≤n, j=1~K, CijFor Walsh matrix WanThe i-th row jth column bit, K and j are positive integer, and K is that more pilot tones are believed
Number quantity.
Fourth aspect, the invention also discloses a kind of CDMA uplink synchronous devices, comprising:
Frame signal receiving module, for receiving the frame signal of user equipment transmission, wherein what i-th of user equipment was sent
The distributed more pilot signal Pilot for being inserted into i-th of user equipment in frame signali,j, j=1~K, i-th of user
More pilot signal Pilot of equipmenti,jTo be obtained according to the pilot signal generation method of any of the above-described first aspect, wherein i, j
It is positive integer with K；
Uplink timing reference value obtains module, for more pilot signal Pilot according to i-th of user equipmenti,jIt obtains
Take the uplink timing reference value of i-th of user equipment.
It is distributed in technical solution provided by the invention, the pilot signal by generation and the frame signal in user equipment
It is inserted into pilot signal, base station is enabled quickly and accurately to carry out channel estimation.
Detailed description of the invention
Fig. 1 is a kind of flow diagram of pilot signal generation method of the embodiment of the present invention one；
Fig. 2 is a kind of flow diagram of CDMA ascending synchronous control method of the embodiment of the present invention two；
Fig. 3 is a kind of flow diagram of CDMA ascending synchronous control method of the embodiment of the present invention two；
Fig. 4 is a kind of composition schematic diagram of frame signal of the embodiment of the present invention three；
Fig. 5 is a kind of structural schematic diagram of pilot signal generating means of the embodiment of the present invention four；
Fig. 6 is a kind of structural schematic diagram of CDMA uplink synchronous control device of the embodiment of the present invention five.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
It should be mentioned that some exemplary embodiments are described as before exemplary embodiment is discussed in greater detail
The processing or method described as flow chart.Although operations (or step) are described as the processing of sequence by flow chart,
Many of these operations can be implemented concurrently, concomitantly or simultaneously.In addition, the sequence of operations can be pacified again
Row.The processing can be terminated when its operations are completed, it is also possible to have the additional step being not included in attached drawing.Institute
Stating processing can correspond to method, function, regulation, subroutine, subprogram etc..
Embodiment one
Fig. 1 be the embodiment of the present invention one provide a kind of pilot signal generation method flow diagram the method includes
Following steps S110- step S120:
S110, according to the first matrix W=[Wan Wan…Wan] and scrambler sequence P, obtain the single of i-th of user equipment
Pilot signalWherein, WanFor the Walsh matrix of n row n column, W includes m WanMatrix, WiFor the i-th row of W
Vector, P are the vector of 1 row n × m column, and n is that user's maximum spreads multiple, and n × m is the number of chips that each pilot signal includes,
M, n and i is positive integer, and i≤n, operatorIt is defined as WiWith P dot product.
Wherein, single pilot signal PilotiSequence length it is shorter.For example, it is 8 that system maximum spread spectrum multiple, which is 8 i.e. n,
A chip, when m is 1 or 2 i.e. 1 or 2 symbol, when pilot length is 8 or 16 chips.When pilot signal sequence is shorter, from
All there is disadvantage in related, the relatively long sequence of cross-correlation parameter.As multi-user and when depositing, cross-correlation problem is especially prominent.If choosing
Random sequence is taken, the interference of the relatively single other sequences of the result after itself correlation of each sequence has certain gain, still
The interference of relatively other all sequences is without any processing gain, so that channel estimation, timing estimation and frequency deviation cannot be obtained
The measured values such as estimation.Therefore, single pilot signal PilotiNeed special design and single pilot signal PilotiSequence
Length needs are designed according to specific system or device.
Walsh matrix has good orthogonal property, is equally had by the first matrix W that Walsh matrix constructs good
Orthogonal performance, orthogonal property can guarantee to obtain when multi-user is synchronous preferably without correlation properties and reduction plesiochronous mode
Multi-user interference.But Walsh matrix autocorrelation performance is poor, i.e. the autocorrelation performance of the first matrix W is poor, is unfavorable for
Timing estimation.Therefore the first matrix W and specific scrambler sequence P are combined, the i-th row vector W of W is takeni, obtain i-th of user and set
Standby single pilot signalPreferably, scrambler sequence P has autocorrelation performance.Scrambler sequence P is by being
The sequence with certain length and that there are correlation properties that system or device are randomly generated.Therefore, ideal by meeting
The W matrix of cross correlation and the scrambler sequence P for meeting preferable autocorrelation performance, obtain with the single of preferable performance
Pilot tone Piloti。
S120, the single pilot signal Pilot according to i-th of user equipmentiConstruct i-th of user equipment
More pilot signal Pilotij, as K≤n, the pilot signal Pilot more than j-th of i-th of user equipmenti,j=Piloti*Cij, when
When K > n, the pilot signal Pilot more than j-th of i-th of useri,j=Piloti*CI (j%n), i≤n, j=1~K, CijFor Walsh
Matrix W anThe i-th row jth column bit, K and j are positive integer, and K is the quantity of more pilot signals.
When the frame signal of user is unable to maintain that ideal orthogonal performance, single pilot signal PilotiIt may still be difficult to full
The requirement of sufficient timing estimation.At this point, the further lifting system performance in such a way that more pilot signals merge.But if
It is distributed in frame signal to be inserted into same single pilot signal Piloti, the multi-user interference situation that multiple pilot tones face is identical,
The ability of resisting multi-user interference cannot be provided on more pilot tone amalgamating theories, greatly reduce system performance.Pass through Walsh matrix
WanThe further pilot signal Pilot more than j-th of i-th of user equipment of constructioni,j, obtain the ability of resisting multi-user interference.
Further, pilot signal generation method further includes establishing more pilot signals inquiry list of i-th of user, institute
State more pilot signal Pilot that more pilot signal inquiry lists include i-th of useri,j, j=1~K, i≤n.It is stored in system
In the case that capacity is sufficiently large, by more pilot signal Pilot of above-mentioned i-th of useri,j(j=1~K) is stored in memory,
The calculation amount that system can be reduced improves the acquisition speed of more pilot signals.In addition, if the calculating speed of system it is sufficiently fast or
Memory capacity is limited, can calculate more pilot signal Pilot of i-th of user in real timei,j, reduce and account for memory-aided space.
Technical solution provided in an embodiment of the present invention obtains i-th of user's using the first orthogonal matrix and scrambler sequence
Single pilot signal Piloti, then pass through single pilot signal PilotiMore pilot tones of i-th of user are obtained with Walsh matrix
Signal Piloti,j, base station is enabled rapidly and accurately to carry out channel estimation to user.
Embodiment two
Fig. 2 is a kind of flow diagram of CDMA ascending synchronous control method provided by Embodiment 2 of the present invention.It should
Method can be executed by base station, be realized with software or example, in hardware.The CDMA ascending synchronous control method includes step
S210- step S220:
S210, the frame signal that user equipment is sent is received, wherein distributed in the frame signal that i-th of user equipment is sent
It is inserted into more pilot signal Pilot of i-th of user equipmenti,j, j=1~K, more pilot tones letter of i-th of user equipment
Number Piloti,jTo be obtained according to the pilot signal generation method any in embodiment one, wherein i, j and K are positive integer；
S220, more pilot signal Pilot according to i-th of user equipmenti,jObtain i-th of user equipment
Uplink timing reference value.
Wherein, uplink timing reference value is for calculating uplink timing error.
Preferably, distribution is inserted into the quantity K of more pilot signals not in the frame signal of i-th of user equipment
Greater than the 20% of the frame signal total quantity of i-th of user equipment, the frame signal of i-th of user by more pilot signals and
Data-signal composition.
Preferably, uniform or non-uniform Distribution formula insertion i-th of the use in the frame signal that i-th of user equipment is sent
More pilot signal Pilot of family equipmenti,j, wherein j=1~K.Wherein, K more pilot signals are in an uniform way or non-homogeneous
The frame signal that mode is inserted into the transmission of i-th of user equipment depends on the specific requirement of channel estimation and offset estimation.
Further, referring to Fig. 3, step S220, according to more pilot signal Pilot of i-th of user equipmenti,jIt obtains
Take the uplink timing reference value of i-th of user equipment, including step S2201- step S2203:
S2201, j-th of pilot signal Pilot that i-th of user equipment is obtained in uplink synchronous search windowi,j's
Associated vector Eijk, wherein k and L is positive integer, and-L≤k≤L, search window length is 2L+1, i≤n, j=1~K；
S2202, according to EijkCalculate the search window associated vector of i-th of user equipment；
S2203, the search window associated vector element absolute value that i-th of user equipment is obtained in uplink synchronous search window
Maximum value, using the corresponding k value of the maximum value as the uplink timing reference value of i-th of user equipment.
Wherein, the timing offset of i-th of user equipment is used to control the modulation of the uplink timing of i-th of user equipment
Direction, after modulation direction is obtained by i-th of user equipment, i-th of user equipment on the basis of the step-length that its system defines to
Modulation direction adjusts transmission timing, to compensate the uplink synchronous deviation of i-th of user equipment.
Further, in step S2202, the search window associated vector of i-th of user equipment is
Or the search window associated vector of i-th of user equipment isWherein, conj
(Eijk) it is EijkComplex conjugate.Timing offset is calculated when frequency deviation is smaller to be passed throughIt calculates, using EikForm
It can use multiple more pilot tones and all or part of counteracting directly carried out to multi-user interference using Walsh matrix；When frequency deviation is larger
When calculate timing offset can pass throughIt calculates, usesForm can also be used multiple more
The Walsh coding form of pilot tone is offset most of since more pilot signals are multiplied the subscriber signal of generation, interference signal two-by-two
The quadratic term of cross term and interference signal.
Technical solution provided by the invention is obtained accurate using the pilot signal generated in embodiment one in base station
Uplink timing error.
Embodiment three
Fig. 4 is a kind of composition schematic diagram of the applicable frame signal of the embodiment of the present invention three.In the present embodiment, in a kind of code point
In the synchronous control system of multiple access, spreading rate is 240Kcps (chip per-second), and uplink frame signal duration is 10ms.
Channel code uses ovsf code, and maximum spread spectrum multiple is 16.Each frame signal includes 2400 chips, corresponding 150 16 times of spread spectrums
Symbol, pilot signal rate 15k.Each frame signal is inserted into pilot signal more than 16 groups, and 32 chips of every group of occupancy separately have 118
A data-signal.The structure of specific frame signal is as shown in Figure 4.Wherein, scrambler sequence is P=[1-1-1-1-1111-111-11-
1-1-1-1-1-1-1-111-1-1-11-1-11-1-1]；Pilot tone generator matrix W=[Wa16 Wa16], wherein Wa16For 16 rows 16
The Walsh matrix of column.The single pilot signal Pilot of i-th of user equipmentiBy the i-th row vector of W WiIt is obtained with scrambler sequence P dot product
It arrives, i.e.,And the frequency pilot sign Pilot more than j-th of i-th of user equipmenti,j=Piloti*Cij, CijFor
Walsh matrix Wa16The i-th row jth column bit, j=1~16." D " is data-signal in Fig. 1, and " P " is more pilot signals.Every 10
Millisecond is 1 frame, 150 signals of every frame, wherein data-signal 118, pilot signal 32.
Base station is when receiving the frame signal of i-th of user equipment, and in 8 times of over-sampling 960k sample rates, base station is utilized
The single pilot signal Pilot of i-th of user equipment for being locally stored or calculating in real timeiWith received i-th of user equipment
The long associated window search arithmetic of the latter chip, can be obtained k-th of j-th of position window of i-th of user equipment before frame signal is done
The estimated value E of mouth positionijk(i=1~16, j=1~16, k=-8~8).In order to remove the influence of frequency deviation, can calculate i-th
The final estimated value of user
E can be used at this timeij0The channel estimation value of j-th of position as i-th of user equipment is simultaneously equal after progress
Weighing apparatus operation.Meanwhile it being searched in the range of k=-8~8Maximum value, corresponding k value symbol embodies i-th of use
The uplink timing error direction of family equipment, after i-th of user equipment obtains the bias direction, in the base of this equipment current setting
Corresponding timing step-length is adjusted on plinth to compensate uplink deviation.It utilizesIt can also estimate the size of terminal uplink frequency spectrum,
The range estimated in the present embodiment is -833~833Hz.After obtaining frequency deviation data, further frequency deviation can be completed by base station and is rectified
Just or i-th of user equipment is notified to carry out frequency deviation adjustment with compensating frequency deviation.
Example IV
Fig. 5 is a kind of structural schematic diagram for pilot signal generating means that the embodiment of the present invention four provides.The pilot tone letter
Number generating means can integrate in the terminal device of user, also can integrate in base station equipment.Referring to Fig. 5, pilot signal
Generating means, comprising:
Single pilot signal generation module 40, for according to the first matrix W=[Wan Wan…Wan] and scrambler sequence P, it obtains
Take the single pilot signal of i-th of user equipmentWherein, WanFor the Walsh matrix of n row n column, W includes m
A WanMatrix, WiFor the i-th row vector of W, P is the vector of 1 row n × m column, and n is that user's maximum spreads multiple, and n × m is each to lead
The number of chips that frequency signal includes, m, n and i are positive integer, and i≤n, operatorIt is defined as WiWith P dot product；
More pilot signal generation modules 41, for the single pilot signal according to i-th of user equipment
PilotiConstruct more pilot signal Pilot of i-th of user equipmentij, wherein as K≤n, j-th of i-th of user equipment
More pilot signal Piloti,j=Piloti*Cij, as K > n, the pilot signal Pilot more than j-th of i-th of useri,j=
Piloti*CI (j%n), i≤n, j=1~K, CijFor Walsh matrix WanThe i-th row jth column bit, K and j are positive integer, and K is more
The quantity of pilot signal.
Technical solution provided in an embodiment of the present invention, it is raw by single pilot signal generation module and more pilot generation modules
At pilot signal, base station is enabled rapidly and accurately to carry out channel estimation to user equipment.
Embodiment five
Fig. 6 is a kind of structural schematic diagram for CDMA uplink synchronous control device that the embodiment of the present invention five provides.Institute
It is integrated in a base station to state CDMA uplink synchronous control device.Referring to Fig. 6, CDMA uplink synchronous control device, comprising:
Frame signal receiving module 50, for receiving the frame signal of user equipment transmission, wherein i-th of user equipment is sent
Frame signal in the distributed more pilot signal Pilot for being inserted into i-th of user equipmenti,j, j=1~K, i-th of the use
More pilot signal Pilot of family equipmenti,jTo be obtained according to the pilot signal generation method any in embodiment one, wherein
I, j and K is positive integer；
Uplink timing reference value obtains module 51, for more pilot signal Pilot according to i-th of user equipmenti,j
Obtain the uplink timing reference value of i-th of user equipment.
Technical solution provided in an embodiment of the present invention obtains mould by frame signal receiving module and uplink timing reference value
Block quickly and accurately carries out channel estimation to user equipment.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, any to be familiar with this profession
Technical staff, without departing from the scope of the present invention, when the technology contents using the disclosure above make a little change
More or modify etc., any modification, equivalent replacement or improvement done within the spirit and principles of the present invention etc. should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of pilot signal generation method characterized by comprising
According to the first matrix W=[Wan Wan…Wan] and scrambler sequence P, obtain the single pilot signal of i-th of user equipmentWherein, WanFor the Walsh matrix of n row n column, W includes m WanMatrix, WiFor the i-th row vector of W, P is
The vector of 1 row n × m column, n are that user's maximum spreads multiple, and n × m is the number of chips that each pilot signal includes, and m, n and i are equal
For positive integer, operatorIt is defined as WiWith P dot product；
According to the single pilot signal Pilot of i-th of user equipmentiConstruct more pilot signals of i-th of user equipment
Pilotij, wherein as K≤n, the pilot signal Pilot more than j-th of i-th of user equipmenti,j=Piloti*Cij, work as K > n
When, the pilot signal Pilot more than j-th of i-th of useri,j=Piloti*CI (j%n), i≤n, j=1~K, CijFor Walsh matrix
WanThe i-th row jth column bit, K and j are positive integer, and K is the quantity of more pilot signals.
2. the method according to claim 1, wherein establishing more pilot signals inquiry list of i-th of user, institute
State more pilot signal Pilot that more pilot signal inquiry lists include i-th of useri,j。
3. the method according to claim 1, wherein the scrambler sequence P has autocorrelation performance.
4. a kind of CDMA uplink synchronisation method characterized by comprising
Receive the frame signal that user equipment is sent, wherein distributed insertion described the in the frame signal that i-th of user equipment is sent
More pilot signal Pilot of i user equipmenti,j, more pilot signal Pilot of i-th of user equipmenti,jFor according to right
It is required that 1~3 any pilot signal generation method obtains, wherein i, j and K are positive integer；
According to more pilot signal Pilot of i-th of user equipmenti,jThe uplink timing for obtaining i-th of user equipment is joined
Examine value.
5. according to the method described in claim 4, it is characterized in that, distributed in the frame signal of i-th of user equipment
Be inserted into the quantity K of more pilot signals no more than i-th of user equipment frame signal total quantity 20%, described i-th
The frame signal of a user is made of more pilot signals and data-signal.
6. according to the method described in claim 4, it is characterized in that, i-th of user equipment send frame signal in uniformly or
Non-uniform Distribution formula is inserted into more pilot signal Pilot of i-th of user equipmenti,j。
7. according to the method described in claim 4, it is characterized in that, according to more pilot signals of i-th of user equipment
Piloti,jObtain the uplink timing reference value of i-th of user equipment, comprising:
J-th of pilot signal Pilot of i-th of user equipment is obtained in uplink synchronous search windowi,jK-th of window position
The associated vector E setijk, wherein k and L is positive integer, and-L≤k≤L, search window length is 2L+1；
According to EijkCalculate the search window associated vector of i-th of user equipment；
The maximum value of the search window associated vector element absolute value of i-th of user equipment is obtained in uplink synchronous search window, it will
Uplink timing reference value of the corresponding k value of the maximum value as i-th of user equipment.
8. the method according to the description of claim 7 is characterized in that the search window associated vector of i-th of user equipment isOr the search window associated vector of i-th of user equipment is
Wherein, conj (Eijk) it is EijkComplex conjugate.
9. a kind of pilot signal generating means characterized by comprising
Single pilot signal generation module, for according to the first matrix W=[Wan Wan…Wan] and scrambler sequence P, obtain i-th
The single pilot signal of a user equipmentWherein, WanFor the Walsh matrix of n row n column, W includes m Wan
Matrix, WiFor the i-th row vector of W, P is the vector of 1 row n × m column, and n is that user's maximum spreads multiple, and n × m is each pilot tone letter
Number number of chips for including, m, n and i are positive integer, operatorIt is defined as WiWith P dot product；
More pilot signal generation modules, for the single pilot signal Pilot according to i-th of user equipmentiBuilding the
More pilot signal Pilot of i user equipmentij, wherein as K≤n, the pilot signal more than j-th of i-th of user equipment
Piloti,j=Piloti*Cij, as K > n, the pilot signal Pilot more than j-th of i-th of useri,j=Piloti*CI (j%n), i
≤ n, j=1~K, CijFor Walsh matrix WanThe i-th row jth column bit, K and j are positive integer, and K is the number of more pilot signals
Amount.
10. a kind of CDMA uplink synchronous device characterized by comprising
Frame signal receiving module, for receiving the frame signal of user equipment transmission, wherein the frame letter that i-th of user equipment is sent
The distributed more pilot signal Pilot for being inserted into i-th of user equipment in numberi,j, more pilot tones of i-th of user equipment
Signal Piloti,jTo be obtained according to any pilot signal generation method of claims 1 to 3, wherein i, j and K are positive whole
Number；
Uplink timing reference value obtains module, for more pilot signal Pilot according to i-th of user equipmenti,jObtain institute
State the uplink timing reference value of i-th of user equipment.
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| CN110912850B (en) * | 2019-11-25 | 2022-08-05 | 重庆邮电大学 | Interference elimination method and device applied to UFMC-MIMO system |
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| CN1951077A (en) * | 2004-03-05 | 2007-04-18 | 高通股份有限公司 | Pilot transmission and channel estimation for miso and mimo system |
| EP2254265A2 (en) * | 2005-01-05 | 2010-11-24 | ATC Technologies, LLC | Adaptive beam forming with multi-user detection and interference reduction in satellite communication systems and methods |
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| CN1951077A (en) * | 2004-03-05 | 2007-04-18 | 高通股份有限公司 | Pilot transmission and channel estimation for miso and mimo system |
| EP2254265A2 (en) * | 2005-01-05 | 2010-11-24 | ATC Technologies, LLC | Adaptive beam forming with multi-user detection and interference reduction in satellite communication systems and methods |
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