CN103457649A - Beamforming transmission method and device - Google Patents

Abstract

An embodiment of the invention discloses beamforming transmission method and device used to improve beamforming transmission performance and relates to the technical field of wireless communication. According to the scheme, a beamforming vector is distributed for a transmission layer corresponding to each codon; the beamforming vectors distributed to the transmission layers are different, and the difference of transmission performances of the codons during beamforming transmission according to the distributed beamforming vectors is the smallest; with regard to one transmission layer that each codon corresponds to, a data symbol of the codon in the transmission layer is mapped to one current antenna according to the beamforming vector distributed to the transmission layer, and the data symbol is sent. The method and device has the advantages that beamforming transmission performance is improved effectively.

Description

The beamforming transmission method and apparatus

Technical field

The present invention relates to wireless communication field, relate in particular to a kind of beamforming transmission method and apparatus.

Background technology

The wave beam forming that is based on Eigenvalues Decomposition (Eigenvalue Based Beamforming, the EBB) algorithm that the wave beam forming technology adopted in multiaerial system at present extensively adopts.The EBB algorithm is determined the figuration vector of employing according to following formula (1), and according to this figuration vector, the signal sent is carried out to beam forming processing.

$w=\arg \underset{w_k}{\max }{w_k}^H{R}_{\mathrm{xx}}{w}_k...\left(1\right)$

According to formula (1), the EBB algorithm is to choose the vectorial w that can make transmission obtain maximum power gain _kas figuration vector w, this figuration vector w is channel correlation matrix R _xxthe characteristic vector of eigenvalue of maximum mapping.If there is the transmission of multilayer, need by R _xxcarry out Eigenvalues Decomposition and obtain a plurality of characteristic vectors:

(N _lthe number of plies that means transmission), the characteristic value of the subchannel equivalent gain that each characteristic vector means is respectively:

meet

common i layer (i ∈ { 1 .., N _l) adopt i characteristic vector v _ifiguration vector as the i layer data.

While adopting the EBB algorithm, because the difference of the equivalent gain of subchannel is more obvious, cause the signal to noise ratio difference of interlayer larger.

The another kind of algorithm that the wave beam forming technology adopts is dirty paper (DP) algorithm.DP algorithm carries out the QR decomposition by the transposition of the channel matrix to uplink, obtains unitary matrice Q, uses the complex-conjugate matrix of Q matrix as the figuration matrix, and the i row in the figuration matrix are the figuration vector of i layer data.

The interference that DP algorithm can cause each layer to be subject to varies in size, and the signal to noise ratio difference of interlayer also can be apparent in view, makes a concrete analysis of as follows:

In following mode, y means to receive vector, and x means the symbolic vector of transmission, and n means Gaussian noise vector.H is descending transmission channel matrix (N _l* N _l, suppose that the transmission number of plies and reception antenna number equate),

h _umean corresponding up channel, up channel is carried out to the QR decomposition and obtain H _u=Q _ur _u.

$y=\mathrm{Hconj}\left(Q_u\right)x+n$

$={\left(Q_u^H{H}^T\right)}^{T}x+n$

$={\left(Q_u^H{H}_u\right)}^{T}x+n$

$={\left(R_u\right)}^{T}x+n$ Make R=R _u ^t

$=\mathrm{Rx}+n;$

Because R _uthe upper triangular matrix that QR decomposes output, so R is a lower triangular matrix, is shown below

$R=\left(\begin{array}{cccc}{r}_{\mathrm{1,1}}& 0& 0& 0\\ r_{\mathrm{1,2}}& r_{\mathrm{2,2}}& ...& 0\\ .& & & .\\ .& ...& ...& .\\ .& & & .\\ r_{1,N_L}& r_{2,N_L}& ...& r_{N_L,N_L}\end{array}\right);$

Mode can be written as

$\left(\begin{array}{c}{y}_1\\ y_2\\ .\\ .\\ .\\ y_{N_L}\end{array}\right)=\left(\begin{array}{cccc}{r}_{\mathrm{1,1}}& 0& 0& 0\\ r_{\mathrm{1,2}}& r_{\mathrm{2,2}}& ...& 0\\ .& & & .\\ .& ..& ...& .\\ .& & & .\\ r_{1,N_L}& r_{2,N_L}& ...& r_{N_L,N_L}\end{array}\right)\left(\begin{array}{c}{x}_1\\ x_2\\ .\\ .\\ .\\ x_{N_L}\end{array}\right)+\left(\begin{array}{c}{n}_1\\ n_2\\ .\\ .\\ .\\ n_{N_L}\end{array}\right);$

From above formula, for the symbol x of ground floor transmission ₁be not subject to the interference of other symbol, the symbol x of second layer transmission ₂be subject to symbol x ₁interference, the like, N _lindividual transmission symbol

be subject to symbol

interference.Interference just because of each layer successively increases, and the detection performance of each layer also has significantly successively reduction.

In realizing process of the present invention, the inventor finds in prior art to exist following technical problem:

When adopting the EBB algorithm to carry out wave beam forming, due to

make this scheme in the situation that many codeword transmission, the performance difference between code word is excessive.Four layers of transmission mode 9 under long-term evolution upgrading shown in Fig. 1 (LTE-A) system of usining are transmitted as example: larger characteristic value characteristic of correspondence vector has all been distributed to first code word as the figuration vector, and second code word used, is all the figuration vector that the characteristic of correspondence value is less.

Due to the method for salary distribution of figuration vector, cause two performance gap between code word larger like this.Thereby can make in the situation that high s/n ratio, the performance of such transmission plan can descend, and because the equivalent channel of second code word is very poor, makes the transmission of second code word be difficult to reach peak rate.And the performance difference of two code words is excessive, from the angle of pattern switching, consider that this figuration algorithm can't be used real system.

In like manner, although cause the reason that interlayer signal to noise ratio difference is larger different from the EBB algorithm when using DP algorithm, the phenomenon caused is similar, so also there will be the excessive problem of codeword performance difference in the EBB algorithm.

Factor except aspect of performance, in Long Term Evolution (LTE)/LTE-A system, in the situation that beamforming transmission, can allocating pre-coding matrix (PMI)/feedback of order indication (RI), now terminal (UE) is only fed back the channel quality indication (CQI) of a code word, and the CQI of another one code word obtains by the reconstruct of base station side, if the performance difference of two code words is larger, the dynamic range of CQI difference relatively also can be larger, and certain requirement can be arranged the precision of reconstruct.And if two codeword performance difference are less, can consider not carry out CQI reconstruct.

A kind of mode that makes the performance balance between code word is that different figuration vectors is carried out to the power adjustment, makes performance approach.But, in the situation that every antenna power rating is limited, the method can make the loss of transmitted power more serious.

Summary of the invention

The embodiment of the present invention provides a kind of beamforming transmission method and apparatus, for improving the performance of beamforming transmission.

A kind of beamforming transmission method, be applied in the beamforming transmission scheme of two code words, and the sum of corresponding at least one transport layer of each code word and transport layer is greater than 2, and the method comprises:

For each transport layer that each code word is corresponding is distributed wave beam forming vector, the wave beam forming vector distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector distributed, carrying out beamforming transmission all;

Corresponding each transport layer for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, sent.

A kind of beamforming transmission device, be applied in the beamforming transmission scheme of two code words, and the sum of corresponding at least one transport layer of each code word and transport layer is greater than 2, and this device comprises:

Figuration vector allocation units, be used to each transport layer corresponding to each code word to distribute wave beam forming vector, the wave beam forming vector distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector distributed, carrying out beamforming transmission all;

The beamforming transmission unit, for each transport layer corresponding for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, sent.

In this programme, for each transport layer that each code word is corresponding is distributed wave beam forming vector, the wave beam forming vector wherein distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector of distribution, carrying out beamforming transmission all; Then, corresponding each transport layer for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, sent.The gap minimum of the transmission performance owing in this programme, according to the wave beam forming vector distributed, carrying out beamforming transmission between code word, therefore can effectively improve the performance of beamforming transmission, especially in the situation that high s/n ratio.

The accompanying drawing explanation

The schematic flow sheet that Fig. 1 is beamforming transmission in prior art;

The method flow schematic diagram that Fig. 2 provides for the embodiment of the present invention;

The schematic flow sheet that Fig. 3 A is the embodiment of the present invention one;

The schematic flow sheet that Fig. 3 B is the embodiment of the present invention two;

The apparatus structure schematic diagram that Fig. 4 provides for the embodiment of the present invention.

Embodiment

In order to improve the performance of beamforming transmission, the embodiment of the present invention provides a kind of beamforming transmission method, is applied in the beamforming transmission scheme of two code words, and the sum of corresponding at least one transport layer of each code word and transport layer is greater than 2.

Referring to Fig. 2, the beamforming transmission method that the embodiment of the present invention provides comprises the following steps:

Step 20: be that each transport layer corresponding to each code word distribute wave beam forming vector, the wave beam forming vector distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector distributed, carrying out beamforming transmission all;

Step 21: corresponding each transport layer for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, is sent.

As a kind of execution mode, in step 20, for each transport layer that each code word is corresponding, distribute the wave beam forming vector, specific implementation can be as follows:

At first, channel correlation matrix is carried out to Eigenvalues Decomposition, obtain a plurality of characteristic vectors;

Then, determine each possible combination of the characteristic vector that in two code words, each transport layer corresponding to the first code word used, each transport layer is used different characteristic vectors; Be to comprise the characteristic vector that each transport layer corresponding to the first code word used in each combination, and the characteristic vector in each combination does not repeat.If transport layer add up to Q, the number of the combination of the characteristic vector that each transport layer corresponding to the first code word used is the number that A is transport layer corresponding to the first code word.

Then, for each combination of determining, determine the difference of the equivalent capacity of two code words under this combination, and choose combination corresponding to minimal difference obtained;

Finally, using the characteristic vector in the combination selected as the wave beam forming vector, distribute to one by one each transport layer corresponding to the first code word; Using other characteristic vectors the characteristic vector in the combination selected in a plurality of characteristic vectors as the wave beam forming vector, distribute to one by one each transport layer corresponding to the second code word in two code words.

Concrete, for each combination of determining, to determine the difference of the equivalent capacity of two code words under this combination, and choose combination corresponding to minimal difference obtained, specific implementation can be as follows:

Suppose that a plurality of characteristic vectors that channel correlation matrix is carried out obtaining after Eigenvalues Decomposition are respectively n _lsum for transport layer; The characteristic vector that each transport layer corresponding to the first code word used is respectively

can determine according to following formula

$i_1,\·\·\·i_{N_1}=\underset{k_1,\·\·\·,k_{N_1}\∈\{1,\·\·\·,N_L\}}{\arg \min }|\underset{m=k_1}{\overset{k_{N1}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_m}{N_L})-\underset{n=k_{N_1+1}}{\overset{k_{N_L}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_n}{N_L})|;$

Wherein, λ _mfor Vm characteristic of correspondence value; λ _nfor V _nthe characteristic of correspondence value;

the average power that is expressed as each transport layer distribution is gross power

situation under the equivalent power gain of subchannel.

be the equivalent capacity of the first code word, it is the equivalent capacity of the second code word; Wherein ∏ takes advantage of symbol for connecting.

mean to find the A that makes the B minimum, above formula is to find and makes

a class value of value minimum

and

Will

as the characteristic vector of choosing in combination corresponding to the minimal difference that obtains.

As another kind of execution mode, in step 20, for each transport layer that each code word is corresponding, distribute the wave beam forming vector, specific implementation can be as follows:

Obtain the wave beam forming vector method of salary distribution obtained by statistics in advance;

According to the described wave beam forming vector method of salary distribution, for each transport layer that each code word is corresponding is distributed the wave beam forming vector.

Concrete, in the transmission number of plies, be 4 and while adopting the EBB algorithm, be the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁, V ₂, V ₃, V ₄for in advance channel correlation matrix being carried out to Eigenvalues Decomposition, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, λ ₄, and λ ₁λ ₂λ ₃λ ₄.

In the transmission number of plies, being 4 and while adopting DP algorithm, is that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed, V ₄for the 4th of described wave beam formed matrix is listed as the vector formed.In the situation that adopt DP algorithm, adopt V ₁the symbol performance of transmission is better than adopting V ₂the symbol performance of transmission, adopt V ₂the symbol performance of transmission is better than adopting V ₃the symbol performance of transmission, adopt V ₃the symbol performance of transmission is better than adopting V ₄the symbol performance of transmission.

In the transmission number of plies, being 3 and while adopting the EBB algorithm, is that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁, V ₂, V ₃for adopting in advance the EBB algorithm to carry out Eigenvalues Decomposition to channel correlation matrix, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, and λ ₁λ ₂λ ₃.

In the transmission number of plies, being 3 and while adopting DP algorithm, is that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed.In the situation that adopt DP algorithm, adopt V ₁the symbol performance of transmission is better than adopting V ₂the symbol performance of transmission, adopt V ₂the symbol performance of transmission is better than adopting V ₃the symbol performance of transmission.

Below in conjunction with specific embodiment, the present invention will be described:

Embodiment mono-:

4 layers with the transmission mode 9 in long-term evolution upgrading (LTE-A) system are transmitted as example, at λ ₁λ ₂... λ ₄situation under, code word 1 adopts characteristic vector { v ₁, v ₄as the figuration vector, code word 2 adopts characteristic vector { v ₂, v ₃as the figuration vector, as shown in Figure 3A.

Step 1: for transport layer 1 and the transport layer 2 of code word 1 correspondence are distributed respectively wave beam forming vector { v ₁, v ₄, distribute respectively wave beam forming vector { v for the transmitting layer 3 of code word 2 correspondences and transport layer 4 ₂, v ₃;

Step 2: code word 1 is mapped to transport layer 1(port 7) and transport layer 2(port 8) upper, code word 2 is mapped to transmitting layer 3 (port 9) and transport layer 4(port one 0) on;

Step 3: according to being the wave beam forming vector v that transport layer 1 is distributed ₁after being mapped on each current antenna by the data symbol on this transport layer 1, sent;

According to being the wave beam forming vector v that transport layer 2 is distributed ₄after being mapped on each current antenna by the data symbol on this transport layer 2, sent;

According to the wave beam forming vector v of distributing for transmitting layer 3 ₂after being mapped on each current antenna by the data symbol on this transmitting layer 3, sent;

According to being the wave beam forming vector v that transport layer 4 is distributed ₃after being mapped on each current antenna by the data symbol on this transport layer 4, sent.

Embodiment bis-:

If the transmission number of plies is 3 layers, at λ ₁λ ₂λ ₃situation under, code word 1 adopts characteristic vector { v ₂as the figuration vector, code word 2 adopts characteristic vector { v ₁, v ₃as the figuration vector, as shown in Figure 3 B.

Step 1: for the transport layer 1 of code word 1 correspondence is distributed wave beam forming vector { v ₂, distribute respectively wave beam forming vector { v for the transport layer 2 of code word 2 correspondences and transmitting layer 3 ₁, v ₃;

Step 2: code word 1 is mapped to transport layer 1(port 7) upper, code word 2 is mapped to transport layer 2(port 8) and transmitting layer 3 (port 9) on;

Step 3: according to being the wave beam forming vector v that transport layer 1 is distributed ₂after being mapped on each current antenna by the data symbol on this transport layer 1, sent;

According to being the wave beam forming vector v that transport layer 2 is distributed ₁after being mapped on each current antenna by the data symbol on this transport layer 2, sent;

According to the wave beam forming vector v of distributing for transmitting layer 3 ₃after being mapped on each current antenna by the data symbol on this transmitting layer 3, sent.

Referring to Fig. 4, the embodiment of the present invention also provides a kind of beamforming transmission device, is applied in the beamforming transmission scheme of two code words, and the sum of corresponding at least one transport layer of each code word and transport layer is greater than 2, and this device comprises:

Figuration vector allocation units 40, be used to each transport layer corresponding to each code word to distribute wave beam forming vector, the wave beam forming vector distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector distributed, carrying out beamforming transmission all;

Beamforming transmission unit 41, for each transport layer corresponding for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, sent.

Further, described figuration vector allocation units 40 for:

Channel correlation matrix is carried out to Eigenvalues Decomposition, obtain a plurality of characteristic vectors;

Determine each possible combination of the characteristic vector that in two code words, each transport layer corresponding to the first code word used, each transport layer is used different characteristic vectors;

For each combination of determining, determine the difference of the equivalent capacity of two code words under this combination, and choose combination corresponding to minimal difference obtained;

Using the characteristic vector in the combination selected as the wave beam forming vector, distribute to one by one each transport layer corresponding to the first code word; Using other characteristic vectors the characteristic vector in this combination in a plurality of characteristic vectors as the wave beam forming vector, distribute to one by one each transport layer corresponding to the second code word in two code words.

Further, described figuration vector allocation units 40 for:

Suppose that described a plurality of characteristic vector is respectively

n _lsum for transport layer; The characteristic vector that each transport layer corresponding to the first code word used is respectively

according to following formula, determine

$i_1,\·\·\·i_{N_1}=\underset{k_1,\·\·\·,k_{N_1}\∈\{1,\·\·\·,N_L\}}{\arg \min }|\underset{m=k_1}{\overset{k_{N1}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_m}{N_L})-\underset{n=k_{N_1+1}}{\overset{k_{N_L}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_n}{N_L})|;$

Wherein, λ _mfor V _mthe characteristic of correspondence value; λ _nfor V _nthe characteristic of correspondence value;

Will

as the characteristic vector of choosing in combination corresponding to the minimal difference that obtains.

Further, described figuration vector allocation units are used for:

Obtain the wave beam forming vector method of salary distribution obtained by statistics in advance;

According to the described wave beam forming vector method of salary distribution, for each transport layer that each code word is corresponding is distributed the wave beam forming vector.

Further, described figuration vector allocation units 40 for:

In the transmission number of plies, being 4 o'clock, is that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁, V ₂, V ₃, V ₄for in advance channel correlation matrix being carried out to Eigenvalues Decomposition, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, λ ₄, and λ ₁λ ₂λ ₃λ ₄.

Further, described figuration vector allocation units 40 for:

In the transmission number of plies, being 4 o'clock, is that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed, V ₄for the 4th of described wave beam formed matrix is listed as the vector formed.In the situation that adopt DP algorithm, adopt V ₁the symbol performance of transmission is better than adopting V ₂the symbol performance of transmission, adopt V ₂the symbol performance of transmission is better than adopting V ₃the symbol performance of transmission, adopt V ₃the symbol performance of transmission is better than adopting V ₄the symbol performance of transmission.

Further, described figuration vector allocation units 40 for:

In the transmission number of plies, being 3 o'clock, is that the wave beam forming vector of the transport layer distribution of the first code word of a corresponding transport layer in two code words is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁, V ₂, V ₃for in advance channel correlation matrix being carried out to Eigenvalues Decomposition, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, and λ ₁λ ₂λ ₃.

Further, described figuration vector allocation units 40 for:

In the transmission number of plies, being 3 o'clock, is that the wave beam forming vector of the transport layer distribution of the first code word of a corresponding transport layer in two code words is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed.In the situation that adopt DP algorithm, adopt V ₁the symbol performance of transmission is better than adopting V ₂the symbol performance of transmission, adopt V ₂the symbol performance of transmission is better than adopting V ₃the symbol performance of transmission, adopt V ₃the symbol performance of transmission is better than adopting V ₄the symbol performance of transmission.

To sum up, beneficial effect of the present invention comprises:

In the scheme that the embodiment of the present invention provides, for each transport layer that each code word is corresponding is distributed wave beam forming vector, the wave beam forming vector wherein distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector of distribution, carrying out beamforming transmission all; Then, corresponding each transport layer for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, sent.The gap minimum of the transmission performance owing in this programme, according to the wave beam forming vector distributed, carrying out beamforming transmission between code word, therefore can effectively improve the performance of beamforming transmission, especially in the situation that high s/n ratio.

Simultaneously, compared with prior art, there is the lifting of complexity hardly in the present invention.

The present invention, by having reduced the gap of transmission performance between code word, can reduce the required precision to transmitting terminal CQI reconstruct.

The present invention describes with reference to flow chart and/or the block diagram of method, equipment (system) and computer program according to the embodiment of the present invention.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.

These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction be stored in this computer-readable memory produce the manufacture that comprises command device, this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

These computer program instructions also can be loaded on computer or other programmable data processing device, make and carry out the sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out on computer or other programmable devices is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.

Although described the preferred embodiments of the present invention, once those skilled in the art obtain the basic creative concept of cicada, can make other change and modification to these embodiment.So claims are intended to all changes and the modification that are interpreted as comprising preferred embodiment and fall into the scope of the invention.

Obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention also is intended to comprise these changes and modification interior.

Claims (16)

1. a beamforming transmission method, be applied in the beamforming transmission scheme of two code words, and the sum of corresponding at least one transport layer of each code word and transport layer is greater than 2, it is characterized in that, the method comprises:

For each transport layer that each code word is corresponding is distributed wave beam forming vector, the wave beam forming vector distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector distributed, carrying out beamforming transmission all;

Corresponding each transport layer for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, sent.

2. the method for claim 1, is characterized in that, described is that each transport layer corresponding to each code word distributed the wave beam forming vector, specifically comprises:

Channel correlation matrix is carried out to Eigenvalues Decomposition, obtain a plurality of characteristic vectors;

Determine each possible combination of the characteristic vector that in two code words, each transport layer corresponding to the first code word used, each transport layer is used different characteristic vectors;

For each combination of determining, determine the difference of the equivalent capacity of two code words under this combination, and choose combination corresponding to minimal difference obtained;

Using the characteristic vector in the combination selected as the wave beam forming vector, distribute to one by one each transport layer corresponding to the first code word; Using other characteristic vectors the characteristic vector in this combination in a plurality of characteristic vectors as the wave beam forming vector, distribute to one by one each transport layer corresponding to the second code word in two code words.

3. method as claimed in claim 2, is characterized in that, described each combination for determining, determine the difference of the equivalent capacity of two code words under this combination, and choose combination corresponding to minimal difference obtained, and specifically comprises:

Suppose that described a plurality of characteristic vector is respectively n _lsum for transport layer; The characteristic vector that each transport layer corresponding to the first code word used is respectively

according to following formula, determine

$i_1,\·\·\·i_{N_1}=\underset{k_1,\·\·\·,k_{N_1}\∈\{1,\·\·\·,N_L\}}{\arg \min }|\underset{m=k_1}{\overset{k_{N1}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_m}{N_L})-\underset{n=k_{N_1+1}}{\overset{k_{N_L}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_n}{N_L})|;$

Wherein, λ _mfor V _mthe characteristic of correspondence value; λ _nfor V _nthe characteristic of correspondence value;

Will

as the characteristic vector of choosing in combination corresponding to the minimal difference that obtains.

4. the method for claim 1, is characterized in that, described is that each transport layer corresponding to each code word distributed the wave beam forming vector, specifically comprises:

Obtain the wave beam forming vector method of salary distribution obtained by statistics in advance;

According to the described wave beam forming vector method of salary distribution, for each transport layer that each code word is corresponding is distributed the wave beam forming vector.

5. method as claimed in claim 4, is characterized in that, in the transmission number of plies, is 4 o'clock, described according to the described wave beam forming vector method of salary distribution, is each transport layer distribution wave beam forming vector corresponding to each code word, specifically comprises:

Be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁, V ₂, V ₃, V ₄for channel correlation matrix is carried out to Eigenvalues Decomposition, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, λ ₄, and λ ₁λ ₂λ ₃λ ₄.

6. method as claimed in claim 4, is characterized in that, in the transmission number of plies, is 4 o'clock, described according to the described wave beam forming vector method of salary distribution, is each transport layer distribution wave beam forming vector corresponding to each code word, specifically comprises:

Be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed, V ₄for the 4th of described wave beam formed matrix is listed as the vector formed.

7. method as claimed in claim 4, is characterized in that, in the transmission number of plies, is 3 o'clock, described according to the described wave beam forming vector method of salary distribution, is each transport layer distribution wave beam forming vector corresponding to each code word, specifically comprises:

The wave beam forming vector that is the transport layer distribution of the first code word of a corresponding transport layer in two code words is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁, V ₂, V ₃for in advance channel correlation matrix being carried out to Eigenvalues Decomposition, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, and λ ₁λ ₂λ ₃.

8. method as claimed in claim 4, is characterized in that, in the transmission number of plies, is 3 o'clock, described according to the described wave beam forming vector method of salary distribution, is each transport layer distribution wave beam forming vector corresponding to each code word, specifically comprises:

The wave beam forming vector that is the transport layer distribution of the first code word of a corresponding transport layer in two code words is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed.

9. a beamforming transmission device, be applied in the beamforming transmission scheme of two code words, and the sum of corresponding at least one transport layer of each code word and transport layer is greater than 2, it is characterized in that, this device comprises:

Figuration vector allocation units, be used to each transport layer corresponding to each code word to distribute wave beam forming vector, the wave beam forming vector distributed for each transport layer is the not identical and gap minimum transmission performance between code word while according to the wave beam forming vector distributed, carrying out beamforming transmission all;

The beamforming transmission unit, for each transport layer corresponding for each code word, after being mapped on each current antenna according to the wave beam forming vector distributed for this transport layer by the data symbol of the code word on this transport layer, sent.

10. device as claimed in claim 9, is characterized in that, described figuration vector allocation units are used for:

Channel correlation matrix is carried out to Eigenvalues Decomposition, obtain a plurality of characteristic vectors;

Determine each possible combination of the characteristic vector that in two code words, each transport layer corresponding to the first code word used, each transport layer is used different characteristic vectors;

For each combination of determining, determine the difference of the equivalent capacity of two code words under this combination, and choose combination corresponding to minimal difference obtained;

Using the characteristic vector in the combination selected as the wave beam forming vector, distribute to one by one each transport layer corresponding to the first code word; Using other characteristic vectors the characteristic vector in this combination in a plurality of characteristic vectors as the wave beam forming vector, distribute to one by one each transport layer corresponding to the second code word in two code words.

11. device as claimed in claim 10, is characterized in that, described figuration vector allocation units are used for:

Suppose that described a plurality of characteristic vector is respectively n _lsum for transport layer; The characteristic vector that each transport layer corresponding to the first code word used is respectively

according to following formula, determine

$i_1,\·\·\·i_{N_1}=\underset{k_1,\·\·\·,k_{N_1}\∈\{1,\·\·\·,N_L\}}{\arg \min }|\underset{m=k_1}{\overset{k_{N1}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_m}{N_L})-\underset{n=k_{N_1+1}}{\overset{k_{N_L}}{\mathrm{\Π}}}(1+\frac{{\mathrm{\λ}}_n}{N_L})|;$

Wherein, λ _mfor V _mthe characteristic of correspondence value; λ _nfor V _nthe characteristic of correspondence value;

Will

as the characteristic vector of choosing in combination corresponding to the minimal difference that obtains.

12. device as claimed in claim 9, is characterized in that, described figuration vector allocation units are used for:

Obtain the wave beam forming vector method of salary distribution obtained by statistics in advance;

According to the described wave beam forming vector method of salary distribution, for each transport layer that each code word is corresponding is distributed the wave beam forming vector.

13. device as claimed in claim 12, is characterized in that, described figuration vector allocation units are used for:

In the transmission number of plies, being 4 o'clock, is that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁, V ₂, V ₃, V ₄for in advance channel correlation matrix being carried out to Eigenvalues Decomposition, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, λ ₄, and λ ₁λ ₂λ ₃λ ₄.

14. device as claimed in claim 12, is characterized in that, described figuration vector allocation units are used for:

In the transmission number of plies, being 4 o'clock, is that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₄, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₃; Perhaps, be that the wave beam forming vector that in two code words, each transport layer corresponding to the first code word distributed is respectively V ₁, V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₂, V ₄;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed, V ₄for the 4th of described wave beam formed matrix is listed as the vector formed.

15. device as claimed in claim 12, is characterized in that, described figuration vector allocation units are used for:

In the transmission number of plies, being 3 o'clock, is that the wave beam forming vector of the transport layer distribution of the first code word of a corresponding transport layer in two code words is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁, V ₂, V ₃for in advance channel correlation matrix being carried out to Eigenvalues Decomposition, a plurality of characteristic vectors that obtain, each characteristic vector characteristic of correspondence value is respectively λ ₁, λ ₂, λ ₃, and λ ₁λ ₂λ ₃.

16. device as claimed in claim 12, is characterized in that, described figuration vector allocation units are used for:

In the transmission number of plies, being 3 o'clock, is that the wave beam forming vector of the transport layer distribution of the first code word of a corresponding transport layer in two code words is respectively V ₂, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₃; Perhaps, be that the wave beam forming vector that the transport layer of the first code word of a corresponding transport layer in two code words is distributed is respectively V ₃, be that the wave beam forming vector that in two code words, each transport layer corresponding to the second code word distributed is respectively V ₁, V ₂;

Wherein, V ₁for the vector that the first row of the wave beam formed matrix that adopts in advance DP algorithm to obtain forms, V ₂for the vector that the secondary series of described wave beam formed matrix forms, V ₃for the 3rd of described wave beam formed matrix is listed as the vector formed.

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