WO2012034514A1

WO2012034514A1 - Method, apparatus, and system for determining target beam-forming weight vector

Info

Publication number: WO2012034514A1
Application number: PCT/CN2011/079607
Authority: WO
Inventors: 索士强; 张静; 张健飞; 韩波
Original assignee: 电信科学技术研究院
Priority date: 2010-09-14
Filing date: 2011-09-14
Publication date: 2012-03-22
Also published as: CN102404030A; CN102404030B

Abstract

The present invention relates to the field of communication. Disclosed are a method, apparatus, and system for determining a target beam-forming weight vector. The method comprises the following steps: determining each data sending unit in the system, and calculating initial beam-forming weight vectors set used by each data sending unit, and then, based on the number of data streams to be transmitted and the initial beam-forming weight vectors set corresponding to the specified data sending units, determining the respective target beam-forming weight vector for each specified data sending unit in sending the data stream, wherein the grade of each target beam-forming weight vector used for sending the same data stream is different. In this manner, it is ensured that the initial beam-forming weight vectors of all grades are used in sending each data stream and the number of times that each initial beam-forming weight vector of each grade used is the same, and therefore, the quality of equivalent channels used during data steam transmission is balanced. The initial beam-forming weight vector of the grades used is the same, and therefore, the quality of the equivalent channel during data steam transmission is balanced.

Description

The present invention claims to be submitted to the Chinese Patent Office on September 14, 2011, and the application number is 201010282516. 1. The invention name is "a method and device for determining a target shaping weight vector" The priority of the Chinese Patent Application, the entire disclosure of which is incorporated herein by reference. Technical field

The present invention relates to the field of communications, and in particular, to a method, device and system for determining a target shaping weight vector. Background technique

Beamforming (BF) is a signal preprocessing technique based on an antenna array. BF produces a directional beam by adjusting the weighting system of each element in the antenna array, so that significant array gain can be obtained.

In the prior art, BF is divided into single stream BF and double stream BF. The so-called dual-flow BF, that is, the covariance matrix of the calculation channel, the first two feature vectors of the feature decomposition correspond to the two shape-of-weight vectors of the dual-stream transmission, the largest feature vector corresponds to the codeword 1, and the second largest feature vector corresponds to the codeword 2 .

In practical applications, dual-stream BF has multiple implementations, including:

1. Joint shaping: that is, each data stream is transmitted using all antennas.

实现This method is used to implement dual-flow BF. When the channel independence is not high, there will usually be two codewords with one performance and one performance, that is, the performance of the two codewords is not balanced, resulting in the dual-flow advantage not being fully realized, even In some cases the performance is worse than the result under open loop.

2. Packet shaping: that is, different data streams are transmitted using different antennas that do not overlap, that is, each data stream is transmitted using only part of the antenna. For example, for 4+4 dual polarization, the same polarized antenna transmits one data, and two sets of different polarized antennas transmit different data streams.

实现This way to achieve dual-flow BF, can not fully utilize the antenna, the performance is sub-optimal.

With the development of technology, the system will gradually upgrade to use multi-stream BF to send data streams. Then, the problem under dual-flow BF will be more obvious in the multi-flow BF environment. In view of this, how to use it in the system In the case of multi-stream BF, determining the appropriate target shaping weight vector for the transmission of the data stream to ensure the equalization of the shield balance of each equivalent channel in the multi-stream transmission becomes the most problem to be solved at present.

Summary of the invention

Embodiments of the present invention provide a method, apparatus, and system for determining a target shaping weight vector, which are used to ensure that the shield amount of each equivalent channel is equalized when the system uses the multi-stream method for beamforming. The specific technical solutions provided by the embodiments of the present invention are as follows:

A method for determining a target shaping weight vector, comprising:

Determining each data transmitting unit in the system, and separately calculating an initial set of shaping weight vectors used by each data transmitting unit;

Determining, according to the number of data streams to be transmitted, and the initial set of weighting vectors corresponding to the designated data transmitting units, the target shaping weight vectors used by each of the designated data transmitting units to transmit each data stream, wherein In the target shaping weight vector determined by each designated data transmitting unit, the levels of the respective shaping weight vectors for transmitting the same data stream are different.

An apparatus for determining a target shaping weight vector includes:

a calculating unit, configured to determine each data sending unit in the system, and calculate an initial set of weighting vector used by each data sending unit;

a determining unit, configured to determine, according to the number of data streams to be transmitted, and a set of initial shaping weight vectors corresponding to each designated data transmitting unit, respectively, for each designated data transmitting unit, to determine a target to be used when transmitting each data stream The weight vector, wherein each of the target shaping weight vectors determined for each of the designated data transmitting units has different levels of the target shaping weight vectors for transmitting the same data stream.

A system for determining a target shaping weight vector, comprising a plurality of base stations, wherein

The base station is configured to determine each data sending unit in the system, and calculate an initial set of weighting vector used by each data sending unit, and based on the number of data streams to be transmitted, and corresponding to each specified data sending unit. a set of initial shaping weight vectors for determining, by each designated data transmitting unit, a target shaping weight vector used for transmitting each data stream, wherein each of the target shaping weight vectors determined by each specified data transmitting unit is used for The levels of the target weighting vectors for sending the same data stream are different.

In this embodiment, each data sending unit in the system is first determined, and an initial shaping right vector set used by each data transmitting unit is calculated, and then based on the number of data streams to be transmitted, and corresponding to each designated data sending unit. a set of initial shaping weight vectors for determining, by each designated data transmitting unit, a target shaping weight vector used for transmitting each data stream, wherein each of the target shaping weight vectors determined by each specified data transmitting unit is used for The levels of the target weighting vectors for sending the same data stream are different. In this way, it can be guaranteed that each data stream is transmitted using all levels of initial shaping weight vectors, and the number of times the initial shaping weight vectors of each level are used is equivalent, thus ensuring the equivalent of each data stream when transmitted. The shield of the channel is balanced, which effectively improves the system performance and improves the system service shield.

DRAWINGS

1 is a schematic structural diagram of a communication system according to an embodiment of the present invention; 2 is a schematic structural diagram of a base station according to an embodiment of the present invention;

FIG. 3 is a flowchart of determining a target shaping weight vector by a base station when the multi-stream BF method is used in the embodiment of the present invention.

detailed description

In the embodiment of the present invention, in the embodiment of the present invention, each data transmission unit in the system is determined, and an initial use of each data transmission unit is calculated. The set of shaping weight vectors, based on the number of data streams to be transmitted, and the initial set of shaping weight vectors corresponding to each designated data transmitting unit, respectively, are determined for each designated data transmitting unit to be used when transmitting each data stream. The target shaping weight vector, wherein each of the target shaping weight vectors determined for each of the designated data transmitting units has different levels of the target shaping weight vectors for transmitting the same data stream.

The above data sending unit has different meanings in different application scenarios.

For example, when the system uses Orthogonal Frequency Division Multiplexing (OFDM) technology, the data sending unit is a frequency domain resource of a specified width, which is also called a subband, and one subband may be a subcarrier, a single Physical Resource Block (PRB) or PRB group. At this time, the system usually uses the frequency domain interleaving method to determine the target shaping weight vector used by each designated data transmitting unit to transmit each data stream based on the initial shaping right vector set corresponding to each designated data transmitting unit. This will be described in detail in the subsequent embodiments.

For another example: The system may also group the antennas according to the number of antennas on the network side, and use each antenna group as a data transmitting unit. At this time, the system usually determines the target shaping weight vector used when each designated data transmitting unit transmits each data stream based on the initial shaping right vector set corresponding to each designated data transmitting unit by means of spatial domain interleaving. This will also be described in detail in the subsequent embodiments.

For another example, the system may also group the antennas according to the number of antennas on the network side, and use each antenna group and a frequency domain resource (ie, a subband) of a specified width as a data transmitting unit. In this case, the system generally uses the spatial domain-domain joint interleaving method to determine the target shaping weight vector used by each designated data transmitting unit to transmit each data stream based on the initial set of shaping weight vectors corresponding to each specified data transmitting unit. . This will also be described in detail in subsequent embodiments.

On the other hand, in the embodiment of the present invention, preferably, the timing for determining the corresponding target shaping weight vector based on the initial shaping weight vector set is also set. E.g,

After calculating the initial set of shaping weight vectors used by each data sending unit, determining the number of data streams to be sent directly, and the initial set of shaping weight vectors corresponding to each data transmitting unit, respectively, determining for each data transmitting unit The target shaping weight vector used when transmitting each data stream; at this time, the corresponding target shaping weight vector needs to be determined for each data transmitting unit. After calculating the initial set of weighting vector used by each data sending unit, further determining, after the terminal is scheduled and completing the scheduling resource allocation, and before sending the data stream to the terminal, based on the number of data streams to be sent, and sending The initial shaping weight vector set corresponding to each data transmitting unit used in the data stream is determined by each data transmitting unit used when transmitting the data stream, and the target shaping weight vector used when transmitting each data stream; It is only necessary to determine the corresponding target shaping weight vector for the partial data transmitting unit used when transmitting the data stream.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 , in the embodiment of the present invention, a communication system includes a plurality of base stations and terminals, wherein the base station is configured to determine each data sending unit in the system, and calculate an initial shaping weight vector used by each data sending unit. a set, and a number of data streams to be transmitted, and an initial set of weighting vectors corresponding to each of the designated data transmitting units, respectively, determining, for each designated data transmitting unit, a target forming right to be used when transmitting each data stream The vector, wherein each of the target shaping weight vectors determined for each of the designated data transmitting units has different levels of the target shaping weight vectors for transmitting the same data stream.

Referring to FIG. 2, in the embodiment of the present invention, the base station includes a calculating unit 20 and a determining unit 21, where the calculating unit 20 is configured to determine each data sending unit in the system, and calculate an initial shape used by each data sending unit. Weight vector set;

a determining unit 21, configured to determine, according to the number of data streams to be transmitted, and an initial set of weighting vector corresponding to each designated data sending unit, respectively, for each designated data sending unit, to use a target for transmitting each data stream a shaping weight vector, wherein, in the target shaping weight vector determined by each designated data transmitting unit, each target shaping weight vector for transmitting the same data stream has different levels;

As shown in FIG. 2, a storage unit 22 and a communication unit 23 are further disposed in the base station, where

The storage unit 22 is configured to save a corresponding target shaping right vector used when transmitting each data stream determined by the determining unit 21;

The communication unit 23, for each target shaping weight vector determined by the determining unit 21, transmits the corresponding data stream through the corresponding data transmitting unit.

In this embodiment, after determining the target shaping weight vector, the determining unit 21 may be used immediately or may be saved to the storage unit 22 for subsequent use. The use of the target shaping weight vector is not limited to the transmission of the data stream. Can be used for system simulation, system testing, and will not be described here.

Based on the above system architecture, referring to FIG. 3, in the embodiment of the present invention, when the system uses the multi-stream BF mode, the detailed process of determining the target shaping weight vector by the base station is as follows:

Step 300: Determine each data sending unit in the system, and calculate an initial shaping right vector set used by each data sending unit. In the embodiment of the present invention, when performing step 300, preferably, the initial set of weighting vector used by any data sending unit is calculated, and the manner of using includes but is not limited to:

For example, suppose the data transmitting unit is a frequency domain resource of a specified width, for example, a PRB group, one PRB group includes G PRBs, each PRB includes k0 subcarriers, and a channel ringing on the kth subcarrier between the receiving antenna and the transmitting antenna Ττ M _R M _T

The matrix is denoted as ^ne L , then the channel covariance matrix ^{k in the} G PRBs is calculated.

And decomposing the feature, obtaining a set of feature vectors, sorting the set of feature vectors according to their eigenvalues from large to d, and taking the first N feature vectors to form an initial set of shaped vectors, called a set. S, in each of the PR PRBs, each PRB uses the set S as its initial set of weighting vectors, where is a conjugation of ¹ ^,

^Mr is the dimension, ^Mr is the number of receiving antennas, ^Μ τ is the number of transmitting antennas, and Ν is the number of data streams to be transmitted.

For another example, if the data transmitting unit is an antenna group, or an antenna group and a frequency domain resource of a specified width,

The channel covariance matrix between the antenna group and the terminal is characterized and decomposed to obtain a set of feature vectors. The set of feature vectors are sorted according to their eigenvalues in descending order, and the first N feature vectors are taken. An initial set of shaped vectors, called set S, uses the set S as its initial set of shaped weight vectors.

Step 310: Determine, according to the number of data streams to be transmitted, and the initial set of weighting vectors corresponding to each designated data sending unit, respectively, for each designated data sending unit, the target shaping right used when transmitting each data stream The vector, wherein each of the target shaping weight vectors determined for each of the designated data transmitting units has different levels of the target shaping weight vectors for transmitting the same data stream.

In the embodiment of the present invention, when the step 310 is performed, the operation mode is different according to the actual application environment. The following describes each operation mode separately.

1. First, step 310 can be implemented by using frequency domain interleaving. Specifically, the subband is used as the data sending unit. Then, the number of data streams to be sent is determined, and the initial assignment corresponding to each designated data sending unit is determined. a set of shape weight vectors, and in each set of initial shape weight vectors, respectively, a target shape weight vector selected for the corresponding designated data transmitting unit to transmit each data stream, wherein, for each designated data transmitting unit, In the target shaping weight vector, the first level of each object shaping weight vector used to transmit the same data stream is different, and the first level is the target shaping weight vector in its initial initial shaping weight vector set. level. For example, the system uses the dual-flow BF method as an example. Then, the number of data streams to be transmitted is 2, and the number of used sub-bands is also 2. Each sub-band needs to use two target shaping weight vectors respectively. Data stream 1 and data stream 2 are transmitted. It is assumed that the initial set of weighting vector corresponding to subband 1 is { ^W i ^T , ^W } where , , and ^ ⁷ are the set of feature vectors obtained by eigen-decomposing the channel covariance matrix, and the eigenvalues are the largest and the second largest. The two eigenvectors, then, the level of ^w i ^T is level 1, and the level of ^W is level 2; for the same reason, it is assumed that the initial set of weighting vector corresponding to subband 2 is { ^w , w'^ }, ^w The level is level 1, and the level of ^w is level 2. Next, from the initial shaping weight vector set { ^W , ^W } , the target shaping weight vector used when the data stream 1 is transmitted as the sub-band 1 is selected, and ^{W is} selected as the target used when the sub-band i transmits the data stream 2 The shaping weight vector, at the same time, in the initial shaping weight vector set { ^w , ^w ' }, ^{w is} selected as the target shaping weight vector used when the subband 2 transmits the data stream 1, and ^{w is} selected as the subband 2 transmission. The target weight vector used when data stream 2 is used. Of course, ^W can also be selected as the target shaping weight vector used when subband 1 transmits data stream 1, ^{W is} selected as the target shaping weight vector used when subband 1 transmits data stream 2, and ^{w is} selected as The target shaping weight vector used when subband 2 transmits data stream 1 is selected as the target shaping weight vector used when subband 2 transmits data stream 2. The previous embodiment of the present invention is described by way of example only, but is not limited thereto. Other implementation manners may also be flexibly selected according to the actual application environment, and the following is also the case in other embodiments, and details are not described herein again.

For another example, the system uses the 4-stream BF method as an example. Then, the number of data streams to be transmitted is 4, the number of used sub-bands is also 4, and each target sub-band needs to use 4 target shaping weight vectors. Used to send data stream 1, data stream 2, data stream 3, and data stream 4, respectively. Suppose that the initial set of weighting vector corresponding to subband 1 is { ^w i ^T , ^W 2 ^T , ^W 3 ^T , ^w } where w , ^W 3 ^T , ^W are a set of features obtained by decomposing the channel covariance matrix. In the feature vector, after the feature values are sorted from large to small, the first 4 bits of the feature vector, then the level of ^w i ^T is level 1, and the level of ^W is level 2, the level of ^w is level 3, the level of ^w For level 4; for the same reason, suppose the initial set of weighting vector corresponding to subband 2 is { ^W , ^W '2 ^T , ^W '3 ^T , ^W '4 ^T }, ^ is of level 1, ^w '2 level For level 2, the level of ^W '3 ^T is level 3, and the level of ^w is level 4; assuming that the initial set of weighting vector vectors corresponding to subband 3 is { ^w "ι ^Γ , , w % ^τ . w "/ _} , The level of w is level i, the level of w " is level 2, the level of ^w "2 ^T is level 3, and the level of ^w " is level 4; assuming that the initial set of weighting vector vectors corresponding to subband 4 is { ^w 1 , ^w 2 , ^w 3 , ^w 4 }, the level of ^w 1 is level 1, the level of ^W ' is level 2, w'", the level of level is level 3, and the level of level 4 is level 4. Then, from the initial set of weighting vectores { ^W i ^T , ^W ' , ^W ' , ^W ' }, the target shaping weight vector used when subband 1 transmits data stream 1 is selected, and ^{W is} selected as a subband. 1 The target shaping weight vector used when transmitting the data stream 2, ^{W is} selected as the target shaping weight vector used when the sub-band 1 transmits the data stream 3, and ^{W is} selected as the target used when the sub-band 1 transmits the data stream 4. Shape weight vector; in the initial shape vector set { ^w ^ , ^w , ^w ,

}, select ^w 2 as the target shaping weight vector used when subband 2 transmits data stream 1, and ^w 3 as the target shaping weight vector used when subband 2 transmits data stream 2, and select ^w as sub The target shaping weight vector used when 2 transmits the data stream 3, and ^{w is} selected as the target shaping weight vector used when the subband 2 transmits the data stream 4; in the initial shaping weight vector set { ^W , ^W "2 ^T , ^{In W} "3 ^T , ^W "4 ^T }, ^W "3 ^{T is} selected as the target shaping weight vector used when subband 3 transmits data stream 1, and the target used to transmit data stream 2 in subband 3 is selected. The shape weight vector, ^w "i ^{r is} selected as the target shaping weight vector used when subband 3 transmits data stream 3, and ^{W is} selected as the target shaping weight vector used when subband 3 transmits data stream 4; In the shape weight vector set { w '"^ , , , ^w "'4 ^r }, the target shaping weight vector used when the data stream 1 is sent for the subband 4 is selected, and ^W ' is selected as the subband 4 to send the data stream. The target shaping weight vector used at 2 o'clock, select ^W '", select the target shaping weight vector used when subband 4 transmits data stream 3, and select ^w '", select subband 4 to send data. The target weight vector used when stream 4.

In summary, in this embodiment, when calculating the initial set of shaping weight vectors used on any one of the sub-bands, the initial shaping weight vectors are arranged in descending order of the feature values, then, in each Between the initial set of weight vector used by the subband, the shield of the equivalent channel corresponding to the initial weight vector of the same level is equivalent; and the frequency domain interleaving method is used to select among the initial set of weight vector When the target shaping weight vector used by each data stream is transmitted on each sub-band, different initial weighting weight vectors are selected as different target shaping weight vectors on different sub-bands for the same data stream, so In terms of transmission bandwidth, each data stream is transmitted using all levels of initial shaping weight vectors, and the number of times the initial shaping weight vectors of each level are used is equivalent. Therefore, the equivalent channel of each data stream is transmitted. The amount of shield is balanced.

2. Secondly, step 310 can be implemented by using airspace interleaving, which is specifically as follows: Each transmitting antenna is divided into N groups.

^Μ τ ^{≥ Ν} where , is the number of data streams to be transmitted, ^Mr is the number of transmitting antennas, and the data transmitting unit is an antenna group. Then, the number of data streams to be transmitted is determined, and corresponding to each designated data transmitting unit is determined. An initial set of shaping weight vectors, and based on each initial set of weighting vector vectors, generating an intermediate set of weighting vectors, wherein The number of intermediate shaping weight vectors included in the weight vector set is the same as the number of initial shaping weight vectors included in the initial shaping weight vector set corresponding to each data transmitting unit; the intermediate shaping weight vector set contains any middle The shaping weight vector is composed of initial shaping weight vectors respectively selected from each initial shaping weight vector set, and the first level of each initial shaping weight vector used to combine the same intermediate shaping weight vector is different. The first level is the level of the initial shaping weight vector in the initial set of shaping weight vectors to which it belongs; next, in the set of intermediate shaping weight vectors, respectively, when each designated data transmitting unit selects to send each data stream a target weighting vector for use, wherein, in the target shaping weight vector selected by each designated data transmitting unit, the second level of each of the target shaping weight vectors for transmitting the same data stream is different, The second level is the level of the target shaping weight vector in the middle of the weighting vector set.

For example, if the system uses the dual-flow BF method and uses a 4+4 dual-polarized antenna as an example, then the number of data streams to be transmitted is 2, and the 4+4 dual-polarized antennas are divided into two groups, called poles. For group 1 and polarization group 2, each polarization group needs to use two target weighting vectors for transmitting data stream 1 and data stream 2, respectively. It is assumed that the initial set of weighting vector corresponding to polarization group 1 is { ^W ,, ^W }, where ^W and ^W are a set of feature vectors obtained by eigen-decomposing based on the covariance matrix of the polarization group 1 and the inter-terminal channel, The two feature vectors with the largest and the second largest eigenvalues, then, the level is level 1, and the level of ^w is level 2. Similarly, the initial set of weighting vector corresponding to polarization group 2 is assumed to be { ^w Ί ^Γ , ^W }, ^w Ί ^Γ is level 1, and ^W is level 2. Subsequently, from a set of initial forming weight vectors ^{W i ^T,} select ^W ^'T, set ^{^{W, W}} from the initial shaping weight vector ^{W is} selected combination to obtain an intermediate shaping weight vector ^W L, and from the initial The set of shaping weight vectors { ^W 1 ^T , ^W } is selected from the initial set of weighting vectores { ^W I' , ^W '2 ^T } to select ^W to obtain the intermediate shaping weight vector ^W 21 ^T , { ^W 12 ^T , ^W 21 ^T ; M £ is a set of intermediate shaping weight vectors, where the level is A, and the level is B, where the values of the A and B levels and the intermediate shaping weight vectors are irrelevant, only Is the level set for differentiation. Finally, the selection will be a polarization group.

1 The target shaping weight vector used when transmitting data stream 1, and ^W ^ is selected as the target shaping weight vector used when polarization group 1 transmits data stream 2, and ^{W is} selected as leveling group 2 to send data stream 1 The target shaping weight vector used at the time will be selected as the target shaping weight vector used when the polarization group 2 transmits the data stream 2. Of course, ^{W is} selected as the target shaping weight vector used when the polarization group 1 transmits the data stream 1, and ^{W is} selected as the target shaping weight vector used when the polarization group 1 transmits the data stream 2, and at the same time, it is selected as the level. It is also feasible to select ^w 2i ^T as the target shaping weight vector used when the polarization group 2 transmits the data stream 2, and the above case is only an example, and No restrictions. In the foregoing embodiment, the two initial shaping weight vectors are combined in multiple implementation manners, including but not limited to the following two modes: Method 1: Direct combination,

The initial shaping weight vector is grouped, where W is the initial shaping weight vector set, ^W "■■ is the initial shaping weight vector; mode 2: shaping optimization combination, that is, using the formula W = Cv for initial shaping Weight vector combination, where, w

w, 0 0

0 w 0

C =

0 0

For the initial set of weighting vector, V is the specified eigenvector of the equivalent channel output by each antenna group, and ^{Wl W2} "' ^W W is the eigenvalue corresponding to each initial shaping weight vector.

In summary, in this embodiment, when calculating the initial set of shaping weight vectors used on any one of the antenna groups, the initial shaping weight vectors are arranged in descending order of the feature values, then, in each antenna Between the initial set of weight vector used by the group, the shield of the equivalent channel corresponding to the initial weight vector of the same level is equivalent; and based on the initial set of weight vector, the equal channel shield equalization is guaranteed. Under the premise, each initial shaping weight vector is combined according to a set manner to generate an intermediate shaping weight vector set, and the spatial shaping interlacing method is used to select each data stream to be sent on each antenna group in the intermediate shaping weight vector set. When the target weighting vector is used, different levels of intermediate shaping weight vectors are selected as the target shaping weight vectors for different antenna groups for the same data stream. Therefore, for all antennas, each data stream is transmitted. All the intermediate shaping weight vectors are used, that is, the initial shaping weight vectors of all levels are used, and the initial shaping weight vectors of each level are used. The number of uses is the same, so the shield of the equivalent channel is balanced when each stream is sent.

3. Again, step 310 can be implemented by using the spatial frequency domain joint interleaving method, specifically: dividing each transmit antenna into N' groups, N'<N, where N is the number of data streams to be transmitted, data The sending unit is an antenna group and a subband, then determining the number of data streams to be sent, determining an initial set of shaping weight vectors corresponding to each specified data sending unit, and generating an intermediate assignment based on each initial set of weighting vector vectors a set of shape weight vectors, wherein any intermediate shape weight vector included in the set of intermediate shape weights is composed of initial shape weight vectors respectively selected from each set of initial weight vector sets, and is used to combine the same middle The first level of each initial shape weight vector of the shape weight vector is different, and the first level is the level of the initial shape weight vector in the initial set of weight vector to which it belongs; In the vector set, each of the designated data transmitting units selects a target shaping right vector to be used when transmitting each data stream, where the target selected for each specified data transmitting unit is selected In the shaping weight vector, the second level of each object shaping weight vector used to transmit the same data stream is different, and the second level is the object shaping weight vector in the middle shaping weight vector set. The level of the middle.

For example, if the system uses the 4-stream BF method and uses the 4+4 dual-polarized antenna, and uses the sub-band 1 and the sub-band 2 as an example, then the number of data streams to be transmitted is 4, 4+4 dual-polarization. The antennas are divided into two groups, called polarization group 1 and polarization group 2. Each polarization group needs to use four target weighting vectors for transmitting data stream 1, data stream 2, and data stream 3 respectively. And data stream 4. It is assumed that the initial set of weighting vector corresponding to polarization group 1 is { ^WT }, where w , ^W 3 ^T , ^w are group feature vectors obtained by eigen decomposition based on the covariance matrix of polarization group 1 and the inter-terminal channel. According to the feature value from large to, after sorting, the first 4 bits of the feature vector, then, the level of ^w i ^T is level 1, and the level of ^w is level 2, the level of ^w is level 3, and the level of ^w is level 4. Similarly, the set of initial shaping weight vectors corresponding to polarization group 2 is { , ^W '2 ^T , ^W '3 ^T , ^W '4 ^T }, the level of ^WT is level 1, and the level of ^W '2 ^T For level 2, the level of ^w is level 3, and the level of ^w is level 4. Subsequently, from a set of initial forming weight vectors ^{w i ^T, www _/} select _Wl ^T, set (w from the initial forming weight vectors', w 'w' W ' /} selection ^w' are combined to obtain an intermediate Fu The weight vector ^w i , and the set of initial weighting vectors { ^w i ^T , ^w ' , w ,

^W 4 ^T} select ^W 2 ^T, set ^{^{^{{W 'Λ W' 2 T}}} , W from the initial forming weight ^{^{^{vectors' 3 T, W '4 T}}} } select ^W' 1 are combined to obtain an intermediate forming weight vectors ^W 21 ^T, from the set initial forming weight vectors ^{^{^{^{{W 1 T, W 2 T}}}} , W 3 T, W 4 T} select ^W 3 ^T, from the set initial forming weight vectors ^{^{W, W}} ^{W is} selected combination to obtain The intermediate shaping weight vector is selected from the initial shaping weight vector set { W ^ , ^W 2 ^T , ^W 3 ^T , ^W } from the initial shaping weight vector set { ^W I' , ^W '2 ^T , ^W '3 ^T , ^W '4 ^T } selects ^W '3 ^T for combination, and obtains the intermediate shaping weight vector ^W 43 ^T , { ^W U , W ₂₁ ^T W ₃₄ ^T W ₄₃ ^T ^3⁄4 3⁄4 r1⁄2 ^ H y W ₁₀ ^T W ₀₁ ^T pl \ W

} Is a set of intermediate forming weight vectors, wherein, ^WL2 and irrelevant "level Class A ^ ^1, ^w 43 levels of Class B, Class A and B herein with the intermediate vector forming weight values, Only the level set for differentiation; then, the target shaping weight vector used when the polarization group 1 and the polarization group 2 transmit the data stream 1 on the sub-band 1 will be selected, and ^{34 is} selected as the polarization group 1 and The target shaping weight vector used when the polarization group 2 transmits the data stream 1 on the sub-band 2, and ^{W is} selected as the target shaping used when the polarization group 1 and the polarization group 2 transmit the data stream 2 on the sub-band 1 The weight vector will be selected as the target shaping weight vector used when polarization group 1 and polarization group 2 transmit data stream 2 on subband 2, and ^{W is} selected as polarization group 1 and polarization group 2 in subband 1 Target shaping used when sending data stream 3 Weight vector, ^{W is} selected as the target shaping weight vector used when polarization group 1 and polarization group 2 transmit data stream 3 on subband 2, and ^{w is} selected as polarization group 1 and polarization group 2 in subband The target shaping weight vector used when transmitting the data stream 4 is selected, and ^{W is} selected as the target shaping weight vector used when the polarization group 1 and the polarization group 2 transmit the data stream 4 on the sub-band 2. Of course, in other ways, in { w , ^W 3 ^T , ^W }, the target shaping weight vector for sending data stream 1, data stream 2, data stream 3, and data stream 4 on the corresponding subband is selected for each group. It is also feasible. The above situation is only an example and is not limited.

On the other hand, in the foregoing embodiment, the two initial shaping weight vectors are combined in multiple implementation manners, including but not limited to "direct combination" and "formation optimization combination". The specific implementation manner has been detailed. Introduction, no more details here.

In summary, in this embodiment, when calculating the initial set of shaping weight vectors used on any one of the antenna groups, the initial shaping weight vectors are arranged in descending order of the feature values, then, in each antenna Between the initial set of weight vector used by the group, the shield of the equivalent channel corresponding to the initial weight vector of the same level is equivalent; and based on the initial set of weight vector, the equal channel shield equalization is guaranteed. Under the premise, each initial shaping weight vector is combined according to the set mode to generate an intermediate shaping weight vector set, and the spatial domain frequency joint interleaving method is used in the middle shaping weight vector set data stream, in different antenna groups and corresponding The intermediate shaping weight vector of different levels is selected as the target shaping weight vector on the subband. Therefore, for all antennas and corresponding subbands, each data stream is transmitted using all levels of intermediate shaping weight vectors. That is, the initial shaping weight vector of all levels is used, and the number of times the initial shaping weight vector of each level is used is equivalent, therefore, each data stream is sent. Shield amount which is equivalent channel equalization.

Based on the foregoing embodiments, in the technical solution provided by the embodiment of the present invention, each data sending unit in the system is first determined, and an initial set of weighting vector used by each data sending unit is calculated, and then based on the number of data streams to be transmitted. And an initial set of shaping weight vectors corresponding to each of the designated data transmitting units, and each of the designated data transmitting units determines a target shaping weight vector used for transmitting each data stream, wherein each of the designated data transmitting units In the determined target shaping weight vector, the levels of the object shaping weight vectors used to transmit the same data stream are different. In this way, it can be guaranteed that each data stream is transmitted using all levels of initial shaping weight vectors, and the number of times the initial shaping weight vectors of each level are used is equivalent ("the same" can be regarded as "equivalent" Special cases), therefore, ensure that the shield of the equivalent channel is balanced when each data stream is transmitted, thereby effectively improving the system performance and improving the system service shield.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be applied to one or more computers in which computer usable program code is included. A form of computer program product embodied on a storage medium (including but not limited to disk storage, CD-ROM, optical storage, etc.).

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

A method for determining a target shaping weight vector, comprising:

Determining each data transmitting unit in the system, and calculating an initial set of shaping weight vectors used by each data transmitting unit; based on the number of data streams to be transmitted, and an initial set of shaping weight vectors corresponding to each designated data transmitting unit, Determining, for each designated data transmitting unit, a target shaping weight vector used for transmitting each data stream, wherein each target for transmitting the same data stream is respectively used in a target shaping weight vector determined by each specified data transmitting unit The levels of the shape vector are different.

The method according to claim 1, wherein the number of data streams to be transmitted and the initial set of weighting vector corresponding to each of the designated data transmitting units are respectively designated data transmitting units Determine the target shaping weight vector to use when sending each data stream, including:

Determining, for each data transmitting unit, a target shaping weight vector used for transmitting each data stream, based on the number of data streams to be transmitted, and the initial set of shaping weight vectors corresponding to each data transmitting unit; or

After determining that the terminal is scheduled and completing the scheduling resource allocation, and before transmitting the data stream to the terminal, based on the number of data streams to be transmitted, and the initial set of weighting vectors corresponding to each data transmitting unit used when transmitting the data stream Each data transmitting unit used for transmitting the data stream determines a target shaping weight vector used when transmitting each data stream.

The method according to claim 1 or 2, wherein the data transmitting unit is a frequency domain resource of a specified width.

The method according to claim 3, wherein the number of data streams to be transmitted and the initial set of weighting vector corresponding to each of the designated data transmitting units are respectively designated data transmitting units Determining a target shaping weight vector used when transmitting each data stream, wherein each of the target shaping weight vectors for transmitting the same data stream in each of the target shaping weight vectors determined by each designated data transmitting unit Not the same, including:

Determine the number of streams to send:

Determining an initial set of shaping weight vectors corresponding to each of the designated data transmitting units;

In each of the initial shaping weight vector sets, a target shaping weight vector used for transmitting each data stream is selected for the corresponding designated data transmitting unit, wherein the target shaping weight vector selected for each specified data transmitting unit is The first level of each of the target shaping weight vectors for transmitting the same data stream is different, and the first level is a level of the target shaping weight vector in its initial set of shaping weight vector.

The method according to claim 1 or 2, wherein the data transmitting unit is an antenna group, and when the antenna group is set, each transmitting antenna is divided into N groups, ≥ N ² , wherein, N For the number of data streams to be transmitted, M _T is the number of transmitting antennas; or

The data sending unit is an antenna group and a frequency domain resource of a specified width, and when the antenna group is set, each transmitting antenna is divided into N′ groups, N′<N, where N is the number of data streams to be transmitted. .

The method according to claim 5, wherein the number of data streams to be transmitted and the initial set of weighting vector corresponding to each of the designated data transmitting units are respectively designated data transmitting units Determining a target shaping weight vector used when transmitting each data stream, wherein each of the target shaping weight vectors for transmitting the same data stream in each of the target shaping weight vectors determined by each designated data transmitting unit Not the same, including:

Determine the number of streams to send:

Generating an intermediate shaping weight vector set based on each initial shaping weight vector set, wherein any intermediate shaping weight vector included in the intermediate shaping weight vector set is respectively selected from each initial shaping weight vector set The initial shaping weight vectors are combined, and the first levels of the initial shaping weight vectors for combining the same intermediate shaping weight vectors are different, and the first level is an initial shaping weight vector at the initial of its attribution. The level in the set of weighted vectores;

In the intermediate shaping weight vector set, the target shaping weight vector used for each data stream is selected for each designated data transmitting unit, wherein, for the target shaping weight vector selected by each specified data transmitting unit, The second level of each target shaping weight vector for transmitting the same data stream is different, and the second level is the level of the target shaping weight vector in the intermediate shaping weight vector set.

7. The method according to claim 6, wherein when the initial shaping weight vector combination is used as the initial shaping weight vector set, the formula \¥ = [ ^ w ... w J, where W is the initial assignment Shape vector collection,

^W ' ^W '"■■ is the initial shaping weight vector; or,

When the initial shape weight vector combination becomes the initial shape of the weight vector, use the formula \¥ = ¥ , where w, 0 · · · 0

0 w, ... 0

W is the initial set of weighting vector, C = , V is the designation of the equivalent channel for each antenna group output

0 0 w Feature vector, w ₂ ... w _w is the eigenvalue corresponding to each initial shaping weight vector.

The method according to claim 1 or 2, wherein after determining, for each of the designated data transmitting units, the target shaping weight vector used for transmitting each data stream, the method further comprises:

The corresponding data shaping unit sends the corresponding data stream through the corresponding data sending unit.

9. An apparatus for determining a target shaping weight vector, comprising:

a calculation unit, configured to determine each data transmission unit in the system, and calculate an initial assignment used by each data transmission unit Shape vector collection

10. The apparatus according to claim 9, wherein the determining unit is configured to:

The device according to claim 9 or 10, wherein the data transmitting unit determined by the calculating unit is a frequency domain resource of a specified width.

The device according to claim 11, wherein the determining unit is configured to:

Determine the number of streams to send:

The device according to claim 9 or 10, wherein the data transmitting unit determined by the calculating unit is an antenna group, and when the antenna group is set, each transmitting antenna is divided into N groups, _{^Τ ≥Ν Ί,} wherein, Ν is the number of data streams to be _transmitted, Μ τ is the number of transmit antennas; or

The data sending unit determined by the calculating unit is an antenna group and a frequency domain resource of a specified width, and when the antenna group is set, each transmitting antenna is divided into N′ groups, where Ν’<Ν, where The number of streams of data transmitted.

14. The apparatus according to claim 13, wherein the determining unit is configured to:

Determine the number of streams to send:

Generating an intermediate shaping weight vector set based on each initial shaping weight vector set, wherein any intermediate shaping weight vector included in the intermediate shaping weight vector set is respectively selected from each initial shaping weight vector set Initial shaped weight vector The first levels of the initial shaping weight vectors for combining the same intermediate shaping weight vectors are different, and the first level is the initial shaping weight vector of the initial shaping weight vector The level in the collection;

The determining unit, in the set of intermediate shaping weight vectors, respectively, selects a target shaping right vector for each designated data transmitting unit to transmit each data stream, wherein the target shaping right selected for each specified data sending unit In the vector, the second levels of the target shaping weight vectors for transmitting the same data stream are different, and the second level is the level of the target shaping weight vector in the intermediate shaping weight vector set.

The device according to claim 14, wherein the determining unit is configured to:

When using the initial shape weight vector combination to become the initial set of weight vector, use the formula τ τ W W

W W, W-, w , where W is the initial set of weight vector, and N is the initial weight vector; or

When the initial composition vector combination is used as the initial shape vector set, the formula \¥ = ¥ is used, where

w, 0 0

0 w 0

0 0 · · · w N

The feature vectors, W, W w _N are the feature values corresponding to the initial shape weight vectors.

The device according to claim 9 or 10, further comprising: a communication unit, configured to: send, by using a corresponding data sending unit, a corresponding data stream by using each target shaping right vector determined by the determining unit .

17. A system for determining a target shaped weight vector, comprising a plurality of base stations, wherein the base station is configured to determine each data transmitting unit in the system, and calculate an initial shape used by each data transmitting unit. a set of weight vectors, and a number of data streams to be transmitted, and an initial set of weighting vectors corresponding to each of the designated data transmitting units, respectively, for each of the designated data transmitting units to determine a target to be used when transmitting each data stream The weight vector, wherein each of the target shaping weight vectors determined for each of the designated data transmitting units has different levels of the target shaping weight vectors for transmitting the same data stream.