CN101632279A - A method of transmitting using phase shift-based precoding and an apparatus for implementing the same in a wireless communication system - Google Patents

Abstract

A method of transmitting data using a plurality of subcarriers in a multi-antenna wireless communication system is disclosed. More specifically, the method includes receiving feedback information from a mobile station (MS), performing channel encoding and modulation independently on user data to be transmitted by each antenna using the received feedback information, determining a phase shift-based precoding matrix for increasing a phase angle of the user data by a fixed amount, and performing precoding using the determined phase shift-based precoding matrix on the user data.

Description

Use is based on the sending method of the precoding of phase shift and the equipment that is used to implement it in wireless communication system

Technical field

The present invention is relevant with a kind of sending method, and particularly a kind of use is based on the sending method of the precoding of phase shift and the equipment that is used to implement it in wireless communication system.

Background technology

At Wideband Code Division Multiple Access (WCDMA) (W-CDMA) system aspects, the research of just carrying out at present passes through to implement for example wave beam formation of various schemes, multiple-input and multiple-output (MIMO) and transmission diversity to increase power system capacity, data transmission bauds and link reliability by using many antennas.Particularly, this MIMO scheme is similar to V-BLAST, promotes high-speed transfer by space diversity, and it is adopted by third generation partner program (3GPP).

Moreover, two (2) antenna systems that adopt in 99 distribution these (Release 99) and 4 distribution these (Release 4) are that the basis has been improved to a kind of new diversity scheme type with the transmission diversity, for example every day, wire rate was controlled (PARC) or each user's rate controlled at the tenth of the twelve Earthly Branches (PU2RC), and it considers to use the operation that surpasses three (3) antennas.

Figure 1A is an exemplary plot, and its explanation is used for the structure of sole user's PARC.Figure 1B is an exemplary plot, and its explanation is used for the structure of a plurality of users' PARC.

For traditional V-BLAST, need not can use identical modulation and coding to dispose each transmitting antenna from the feedback information of channel quality information (CQI).Yet shown in Figure 1A and 1B, this PARC uses the feedback information about this channel conditions, for example modulating-coding collection (MCS) and/or transmitting antenna subclass (TAS), and select will be by the customer traffic that each antenna transmitted.

With reference to Figure 1A, because it only is the exemplary illustration that is used for sole user's PARC, so select in three (3) customer traffics any.With reference to Figure 1B, because it only is the exemplary illustration that is used for a plurality of users' PARC, so at least two (2) individual in selection three (3) the individual customer traffics.

After this, use about the modulation of the feedback information of channel conditions and coding and be used to be stored in behind the demultiplexing customer traffic in the buffer.Operational version (for example OFDM (OFDMA)) is come multiplexing this customer traffic and is passed through each antenna transmission subsequently.

In other words, the base station (BS) of using this PARC scheme uses feedback information operation dispatching from mobile radio station (MS) transmission with the optimization transmission rate.Based on this, MS or two or more MS can share frequency and the time resource in the spatial domain simultaneously.Moreover this PARC scheme allows the increase along with the diversity gain of the quantity increase of the MS that this BS dispatched.

By using the PARC scheme,, can reduce feedback added burden (overhead) owing to only have CQI to be used as feedback information.If added burden less or that reduce is arranged, then the wrong probability in this feedback processing is relatively low, and can be used for sole user's PARC and be used for switching between a plurality of users' the PARC.Yet in the situation of the PARC that is used for a plurality of users, the interference between the user may take place and influence efficiency of transmission.

Fig. 2 is the exemplary plot of the structure of explanation PU2RC.The PU2RC usage space is multiplexing to transmit a plurality of user's data streams.Therefore, a plurality of data flow are selected transfers to a plurality of users.In this PU2RC, (unitary) matrix at the tenth of the twelve Earthly Branches that decomposes according to the singular value (singular value decomposition) of mimo channel is used to carry out precoding.

Particularly, the unitary matrice in transmitter is the set by the selected unit of all users (or mobile radio station) basis vector.If it is fixing that this vector set is combined into, represented by M, this unit basis vector is user-selected by one or more.

Moreover PU2RC can be used to reduce the internal user interference and reach the high efficiency gain.Yet,,, thereby increase the possibility of error of transmission owing to the large scale of feedback information so the size of feedback information may be very big owing to can comprise preferable matrix index the preferable vector of information in this matrix.

Summary of the invention

Technical scheme

Therefore, present invention is directed at sending method and a kind of equipment of in wireless communication system implementing this method of a kind of use based on the precoding of phase shift, it can be avoided substantially because the restriction of correlation technique and one or more problems that shortcoming caused.

One object of the present invention is to provide a kind of and uses a plurality of subcarriers to send the method for data in multi-aerial radio communication system.

Another object of the present invention provides a kind of transmission and receiving system that uses a plurality of subcarriers in multi-user, multiple antenna communication.

Additional advantage of the present invention, purpose and characteristic will propose in following description, and the part will by those skilled in the art by read over hereinafter understands or by enforcement the present invention learnt.Can be understood and obtained purpose of the present invention and other advantage by structure that particularly points out in the written description of this paper and the claim and accompanying drawing.

In order to reach these purposes and other advantage and according to purpose of the present invention, as institute's enforcements and broadly described herein, a kind of method that a plurality of subcarriers of use transmit data in multi-aerial radio communication system comprises from mobile radio station (MS) receiving feedback information; The feedback information that uses this reception will be to will independently carrying out chnnel coding and modulation by the user data of each antenna transmission; Be identified for making the phase angle of this user data to increase the pre-coding matrix based on phase shift of fixing amount; And use this pre-coding matrix of determining that this user data is carried out precoding based on phase shift.

In another aspect of this invention, a kind of transmission and receiving system that in multi-user, multiple antenna communication, uses a plurality of subcarriers, comprise channel encoder and modulator, it is configured to independently carry out chnnel coding and modulation from the feedback information of receiving system for the user data on each antenna by using; And first precoder, it is configured to determine based on the pre-coding matrix of phase shift and uses this pre-coding matrix based on phase shift of determining that this user data is carried out precoding, wherein, determined according to the phase angle of the user data that increases each antenna regularly.

Description of drawings

The included accompanying drawing of the present invention is used to provide to further understanding of the present invention, and they are bonded to this part that has also constituted this specification, and these accompanying drawings show embodiments of the invention, and is used from explanation principle of the present invention with specification one.

In the accompanying drawings:

Figure 1A and 1B figure are exemplary plot, and it illustrates the structure of the PARC that is used for sole user and a plurality of users respectively;

Fig. 2 is an exemplary plot, the structure of its explanation PU2RC;

Fig. 3 A is an exemplary plot, and its explanation is according to the transmitter of the communication system of embodiment #1;

Fig. 3 B and 3C are exemplary plot, the processing or the process of the precoder of the transmitter of its key diagram 3A;

Fig. 4 is an exemplary plot, and its explanation is based on the precoding of phase shift;

Fig. 5 is an exemplary plot, and it illustrates the change of the channel size that causes because of circulation delay;

Fig. 6 is an exemplary plot, and it illustrates multiaerial system, and this multiaerial system has been employed traditional spatial reuse and cyclic delay diversity scheme, and it has four (4) transmitting antennas and spatial reuse rate 2;

Fig. 7 is the exemplary plot of multiaerial system, and this system has been employed the pre-coding matrix based on phase shift of equation 10;

Fig. 8 is the exemplary plot of four antenna systems, and wherein the specific part of pre-coding matrix is selected;

Fig. 9 is an exemplary plot, and its explanation is according to the transmitter of embodiment #2;

Figure 10 is an exemplary plot, and its explanation is supported based on transmitter and receiver in the multiaerial system of the precoding of code book;

Figure 11 A is an exemplary plot, and its explanation conventional P ARC and method of the present invention do not have the comparison in the environment of spatial coherence in ITU PedA channel;

Figure 11 B is an exemplary plot, and its explanation conventional P ARC and method of the present invention are comparison in 70% the environment at spatial coherence;

Figure 12 A is an exemplary plot, and its explanation conventional P ARC and method of the present invention have the optionally comparison in the TU channel of high-frequency;

Figure 12 B is another exemplary plot, and its explanation conventional P ARC and method of the present invention have the optionally comparison in the TU channel of high-frequency.

The preferred forms of invention

Be elaborated referring now to the preferred embodiment of the present invention, its example is represented in the accompanying drawings.In any part, identical Reference numeral is used to indicate identical or similar part in the accompanying drawings.

Discussion related to the present invention can be used in the various wireless communication systems.This wireless communication system can be used to provide and relevant services such as voice, audio frequency, grouped data.Moreover, below discuss can be used in the transmission of up and down link.Herein, this downlink transmission is meant the transmission from BS to MS; On the contrary, this ul transmissions is meant the transmission from MS to this BS.

This BS generally is meant fixed station, and also can be called as Node B, other title such as base transceiver device system (BS), access point (AP), network and service station.This MS can be mobile and/or fixing, and can be called as other titles such as subscriber equipment (UE), user terminal (UT), subscriber station (SS), mobile subscriber station (MSS), portable terminal (MT) and wireless device.

Can be used to single carrier or multi-carrier communications systems about discussion of the present invention.Multicarrier system can be used various modulation schemes, for example OFDM (OFDM) and OFDM (OFDMA).This OFDM/OFDMA is that the frequency range of total system is split into the scheme that several have the subcarrier of orthogonality.Herein, this subcarrier also can be called as sub-band or tone (tone).Alternatively, this single-carrier system can use various modulation schemes, comprises single-carrier frequency division multiple access (SC-CDMA) or code division multiple access (CDMA).

Generally speaking, communication system comprises transmitter and receiver.Herein, unit or the module that can carry out the function of this transmitter and this receiver can be called as transceiver.Yet for the purpose of feedback information is discussed, this transmitter and this receiver can be by independent uses.

In the down link direction, transmitter can be the part of BS, and receiver can be the part of MS.Alternatively, transmitter can be the part of MS, and receiver can be the part of BS.BS can comprise a plurality of transmitters and/or receiver.Similarly, MS can comprise a plurality of transmitters and/or receiver.

Embodiment #1

This embodiment and modulation by each transmitting antenna among the separate configurations multi-user, multiaerial system and coding and the optimization efficiency of transmission is relevant.Herein, can be used to minimize based on the precoding of phase shift or reduce interference between the user.

Fig. 3 A is an exemplary plot, and its explanation is according to the transmitter of the communication system of embodiment #1.With reference to Fig. 3 A, this transmitter 100 comprises scheduler/multiplexer 110, a plurality of channel encoder/modulator (120-1～120-N), precoder 130, a plurality of serial/parallel (SP) transducer (140-1～140-Nt), a plurality of modulator (150-1～150-Nt).

Fig. 3 B and 3C are exemplary plot, the processing or the process of the precoder of the transmitter of its key diagram 3A.

In Fig. 3 A, can be when message bit stream be imported by each user configuration schedules device/multiplexer 110 with dispatched users (or MS).From the user of this scheduling, can select to be actually used in the user of transmission, and the information bit of this selection can be re-used.

(120-1～120-N) is with by encoding this multiplexing information and the data of output encoder according to the predictive encoding scheme for configurable a plurality of channel encoder/modulator.After this, can use predetermined modulation schemes to modulate this coded data.This information bit can comprise literal, audio frequency, video or other data type.

Moreover, these a plurality of channel encoder/modulators (120-1～120-N) can add or add error detection bits (for example Cyclical Redundancy Check (CRC)) to this information bit and further increasing additionally to encode to be used for error correcting.This error correcting code can comprise TURBO sign indicating number, low density parity check code (LDPC) and convolution code and various other error correcting code.

(120-1～120-N) is with the symbol of this coded data of mapping (or distribution) on amplitude and the phase constellation figure for configurable a plurality of channel encoder/modulator.The modulation scheme that can be employed is unrestricted and can be changed, and these schemes can be m-Quadrature Phase Shift Keying (m-PSK) scheme or m-quadrature amplitude modulation (m-QAM) scheme.For instance, this m-PSK scheme comprises binary phase shift keying (BPSK), Quadrature Phase Shift Keying (QPSK) or 8-PSK.Moreover this m-QAM comprises 16-QAM, 64-QAM or 256-QAM.

Configurable precoder 130 is to use precoding based on phase shift to institute's mapped symbol.Herein, these precoder 130 exportable transmission symbols, it is for during the transmission or the assemble of symbol that transmits in the time slot.The precoding based on phase shift that this precoder 130 is carried out hereinafter will be discussed.

(140-1～140-Nt) is to export corresponding a plurality of modulator (precoding transmission symbol of 150-1～150-Nt) for configurable a plurality of S/P transducer.Configurable a plurality of modulator (150-1～150-Nt) with the modulation of foundation multiple-access modulation scheme from S/P transducer (each transmission symbol of 140-1～140-Nt).The multiple-access modulation scheme that can be employed is not for limited, and these schemes can be single-carrier modulation scheme (for example CDMA) or multi carrier modulation scheme (for example OFDMA).

The pre-coding scheme of using in dual-antenna system that uses the OFDM multi carrier modulation scheme and/or four antenna systems based on phase shift below is discussed.Moreover this discussion is relevant to the application of the multiaerial system with Nt antenna amount with the precoding based on phase shift.Particularly, this discussion can be according to the structure based on the pre-coding matrix of phase shift of generalization, and it can be used to improve the multiaerial system with Nt antenna amount.

Pre-coding scheme based on phase shift

Fig. 4 is an exemplary plot, and its explanation is based on the precoding of phase shift.Should can be defined as data flow by all antennas but multiply each other and the scheme transmitted based on precoding of phase shift with the phase sequence of different (or independences).Generally speaking, if little circulation delay can be used to set up phase sequence, then to select be to be provided by this receiver (for example MS) aspect to the frequency of channel, and the visual frequency domain of the size of this channel and increase or reduce.

Fig. 5 is an exemplary plot, the change of the channel size that its explanation circulation delay causes.With reference to Fig. 5, this transmitter 100 can by distributing user (or MS) to the part of this frequency to reach frequency diversity, wherein the increase owing to the frequency of frequency domain improves channel conditions.Herein, the fluctuation that has big frequency range and not caused by relatively little circulation delay numerical value of the specific part of frequency domain influences.In order to use the circulation delay numerical value that evenly increases or reduce for each antenna, can use the pre-coding matrix based on phase shift represented as equation 1.

[equation 1]

Cf. equation 1, k represents the index or the frequency resource index of subcarrier, wherein specific frequency range is assigned to each resource, and W _{I, j} ^k(i=1 ..., N, j=1,1 ..., R) expression is according to the definite complex weighted value (complex weight) of k.Moreover Nt represents the quantity of transmitting antenna or virtual-antenna (quantity of for example a plurality of spatial reuse rates), and R representation space reusability.Herein, this complex weighted value can and increase to the corresponding subcarrier of antenna and changes according to the OFDM symbol.In addition, complex weighted value can be by channel conditions and/or feedback information and is determined.Preferably, the pre-coding matrix P of equation 1 is by using unitary matrice to be disposed so that reduce the loss of the channel capacity of multiaerial system.

Following equation can be used to indicate the channel capacity of many antennas open cycle system so that define the element (or part) of this unitary matrice.

[equation 2]

$\mathrm{Cu}\left(H\right)={\log }_2\left(\det (I_{N_r}+\frac{\mathrm{SNR}}{N}{\mathrm{HH}}^H)\right)$

Cf. equation 2, H represents the multi-antenna channel matrix, it has size Nr * Nt, and Nr represents the quantity of reception antenna.If equation 2 is applied to the pre-coding matrix P based on phase shift, then the result can be represented by equation 3.

[equation 3]

$C_{\mathrm{precoding}}={\log }_2\left(\det (I_{N_r}+\frac{\mathrm{SNR}}{N}{\mathrm{HPP}}^H{H}^H)\right)$

Cf. equation 3 is in order to minimize or eliminate channel capacity loss, PP ^HBe necessary for unit matrix.Therefore, should must satisfy the following condition of equation 4 based on the matrix P of phase shift.

[equation 4]

PP ^H＝I _N

In order to make this pre-coding matrix P based on phase shift be converted into unit matrix, two (2) conditions must be satisfied.That is Power Limitation condition and orthogonality restrictive condition must be satisfied simultaneously.This Power Limitation condition is to equal 1 relevant with the size of each row that makes this matrix.Moreover this orthogonality restrictive condition is to classify relevant (perhaps those row are orthogonal) of quadrature as with making each.Equation 5 and equation 6 are these example.

[equation 5]

${\left|{\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{1,1}}^k\right|}^2+{\left|{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{2,1}}^k\right|}^2+...+{\left|w_{N_t,1}^k\right|}^2=1,$

${\left|{\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{1,2}}^k\right|}^2+{\left|{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{2,2}}^k\right|}^2+...+{\left|w_{N_t,2}^k\right|}^2=1,$

.

.

.

${\left|{\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{1,R}^k\right|}^2+{\left|{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{2,R}^k\right|}^2+...+{\left|w_{N_t,R}^k\right|}^2=1,$

[equation 6]

${\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{1,1}}^{k^{*}}{\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{1,2}}^k+{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{2,1}}^{k^{*}}{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{2,2}}^k+...+w_{N_t,1}^{k^{*}}{w}_{N_t,2}^k=0,$

${\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{1,1}}^{k^{*}}{\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{1,3}}^k+{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{2,1}}^{k^{*}}{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{2,3}}^k+...+w_{N_t,1}^{k^{*}}{w}_{N_t,3}^k=0,$

.

.

.

${\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{1,1}}^{k^{*}}{\mathrm{<figure-callout\; id="1"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{1,R}^k+{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{\mathrm{2,1}}^{k^{*}}{\mathrm{<figure-callout\; id="2"\; label="w"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">w</figure-callout>}}_{2,R}^k+...+w_{N_t,1}^{k^{*}}{w}_{N_t,R}^k=0$

Aforementioned discussion about equation 2-6 is relevant with unitary matrice.After this, the discussion of this unitary matrice is relevant with the pre-coding matrix based on phase shift with 2 * 2 matrix size.

The pre-coding matrix based on phase shift of equation 7 expression broad sense, it is used to have in the system of spatial reuse rate and two (2) individual transmitting antennas.

[equation 7]

$p_{2x2}^k=\left(\begin{array}{cc}{\mathrm{\&alpha;}}_1{e}^{{\mathrm{jk\&theta;}}_1}& {\mathrm{\&beta;}}_1{e}^{\mathrm{jk}{\mathrm{\&theta;}}_2}\\ {\mathrm{\&beta;}}_2{e}^{\mathrm{jk}{\mathrm{\&theta;}}_3}& {\mathrm{\&alpha;}}_2{e}^{\mathrm{jk}{\mathrm{\&theta;}}_4}\end{array}\right)$

Cf. equation 7, α _i, β _i(i=1,2) expression real number, θ _i(i=1,2,3,4) expression phase value, and k represents the sub-carrier indices or the resource index of ofdm signal.

In order to change this pre-coding matrix (for example equation 7) is unit matrix, and the Power Limitation condition of equation 8 and the orthogonality restrictive condition of equation 9 need be satisfied.

[equation 8]

${\left|{\mathrm{\&alpha;}}_1{e}^{\mathrm{jk}{\mathrm{\&theta;}}_1}\right|}^2+{\left|{\mathrm{\&beta;}}_2{e}^{\mathrm{jk}{\mathrm{\&theta;}}_3}\right|}^2=1,{\left|{\mathrm{\&alpha;}}_2{e}^{\mathrm{jk}{\mathrm{\&theta;}}_4}\right|}^2+{\left|{\mathrm{\&beta;}}_1{e}^{{\mathrm{jk\&theta;}}_2}\right|}^2=1$

[equation 9]

${\left({\mathrm{\&alpha;}}_1{e}^{{\mathrm{jk\&theta;}}_1}\right)}^{*}+{\mathrm{\&beta;}}_1{e}^{{\mathrm{jk\&theta;}}_2}=1+{\left({\mathrm{\&beta;}}_2{e}^{\mathrm{jk}{\mathrm{\&theta;}}_3}\right)}^{*}+{\mathrm{\&alpha;}}_2{e}^{\mathrm{jk}{\mathrm{\&theta;}}_4}=0$

In equation 8 and 9, * represents conjugate complex number.Satisfy equation 7-9 if size is 2 * 2 the pre-coding matrix based on phase shift, this matrix can be as hereinafter being represented as shown in the equation 10.

[equation 10]

$p_{2x2}^k=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}1& e^{{\mathrm{jk\&theta;}}_2}\\ e^{{\mathrm{jk\&theta;}}_3}& 1\end{array}\right)$

Cf. equation 10, θ ₂And θ ₃Keep orthogonality relation according to satisfying this orthogonality restrictive condition.This can be shown in the equation 11.

[equation 11]

kθ ₃＝-kθ ₂+π

This pre-coding matrix can the code book form be stored in transmitter and the receiver.This code book can comprise the different θ that use specific quantity ₂The various pre-coding matrixes that numerical value is set up.Herein, θ ₂Whether numerical value can be provided and be disposed according to channel conditions and feedback information.If this feedback information is provided (perhaps being used), θ ₂Numerical value can be configured to little numerical value.If this feedback information is not provided (perhaps not being used), θ ₂Numerical value can be configured to big numerical value so that reach the high-frequency diversity gain.

Even should be established based on the matrix of phase shift, similar with equation 7, this reusability R can consider the actual antennas quantity that channel conditions causes and must be set as low.In this case, corresponding to the quantity based on the particular column of the present spatial reuse rate (for example spatial reuse rate of Jiang Diing) of the pre-coding matrix of phase shift of this foundation can be selected to reconfigure the pre-coding matrix based on phase shift.In other words, the new pre-coding matrix that is applied to corresponding system when being changed, each spatial reuse rate is not set up.Opposite, this is initial, and (or at first setting up) is used based on the pre-coding matrix of phase shift is sustainable, and particular column that should the correspondence pre-coding matrix can be selected to reconfigure pre-coding matrix.

For instance, cf. equation 10, this multiple antenna communication comprises two (2) transmitting antennas, and this spatial reuse rate is 2.Yet this spatial reuse rate can change and can be reduced to 1.In this case, the row of the pre-coding matrix of equation 10 can be selected and these selecteed row can be used to precoding.

For instance, if select secondary series, then the pre-coding matrix based on phase shift can be represented as shown in equation 12.Moreover, this equation form and cyclic delay diversity scheme be used in two (2) system of transmit antennas form class seemingly.

[equation 12]

$P_{2x1}^k=\frac{1}{\sqrt{2}}\left(\begin{array}{c}{e}^{\mathrm{jk}{\mathrm{\&theta;}}_2}\\ 1\end{array}\right)$

Equation 12 is the exemplary illustration about the system with two (2) transmitting antennas.Yet this equation also can be applied to the system with four (4) transmitting antennas.In other words, in four (4) system of transmit antennas, after this pre-coding matrix based on phase shift is established, can select particular column according to the spatial reuse rate (for example the spatial reuse rate becomes 1 from 2) that changes, and selecteed particular column can be used to precoding.

Fig. 6 is the exemplary plot of explanation multiaerial system, and this system has four (4) transmitting antennas and the spatial reuse rate is 2, this system applies traditional spatial reuse and cyclic delay diversity scheme.Fig. 7 is for using the exemplary plot based on the multiaerial system of the pre-coding matrix of phase shift of equation 10.

With reference to Fig. 6, the first sequence S ₁And the second sequence S ₂Be transferred into first antenna (for example ANT#1) and third antenna (for example ANT#3) respectively.Moreover, phase shift first sequence

And phase shift second sequence

Be transferred into second antenna (for example ANT#2) and the 4th antenna (for example ANT#4) respectively.According to this configuration, the spatial reuse rate is 2 significantly, with reference to Fig. 7, and sequence

Be transferred into first antenna (for example ANT#1), sequence

Be transferred into third antenna (for example ANT#3), sequence $s_1{e}^{\mathrm{jk}{\mathrm{\&theta;}}_1}+s_2{e}^{\mathrm{jk}({\mathrm{\&theta;}}_1+{\mathrm{\&theta;}}_2)}$ Be transferred into second antenna (for example ANT#2), and sequence $s_1{e}^{\mathrm{jk}({\mathrm{\&theta;}}_1+{\mathrm{\&theta;}}_1)}+s_2{e}^{\mathrm{jk}{\mathrm{\&theta;}}_1}$ Be transferred into the 4th antenna (for example ANT#4).

Compare with the system of Fig. 6, the system of Fig. 7 uses the unitary pre-coding matrix to carry out circulation delay (perhaps phase shift) so that utilize cyclic delay diversity scheme on four (4) antennas.

The pre-coding matrix based on phase shift of each spatial reuse rate can be organized as following table in two (2) antenna systems and four (4) antenna systems.

[table 1]

With reference to table 1, θ _i(i=1,2,3) expression is according to the circulation delay numerical value at phase angle, and k represents the index or the resource index of OFDM subcarrier.Can by from the spatial reuse rate be 2 four (4) antenna systems select the specific part of pre-coding matrix to obtain to show the table 1 four (4) plant the pre-coding matrix types.This is illustrated among Fig. 8, and it is the exemplary plot of four antenna systems of the specific part of this pre-coding matrix of selection.

In addition, owing to four (4) pre-coding matrixes shown in the table 1 do not need to be provided in this code book individually or independently, so the storage of this transmitter and this receiver or internal memory can be retained.Moreover, as previously mentioned, should can be used to according to identity logic have the M antenna amount and the spatial reuse rate is that N is (in the system of N≤M) based on pre-coding matrix of phase shift.

Be used to implement first precoder based on the pre-coding scheme of phase shift

The first precoder 130-1 comprises that pre-coding matrix is set up module 131-1, matrix reconfigures module 133-1 and precoding module 134-1.Particularly, pre-coding matrix is set up module 131-1 and can be configured to by the definite reference line corresponding to first subcarrier of regulation pre-coding matrix, and carries out phase shift to determine the residue row.Herein, phase shift is based on phase angle one constant or the same amount that increase progressively reference line and carries out.

In the present invention, can use and have specific dimensions the unitary matrice of ((quantity of transmitting antenna) * (spatial reuse rate)) is carried out precoding.This unitary matrice can be provided to the index or the index resource of each subcarrier, can be and be used for the unitary matrice of first index by phase shift, thereby the unitary matrice that is used to remain index can be determined.

Pre-coding matrix is set up module 131-1 can select any first pre-coding matrix from the code book being stored in this internal memory 150.Second pre-coding matrix that is used for the subcarrier of second index can little move to first pre-coding matrix mutually and set up by using.Herein, whether the amount of phase shift can be received and determined according to channel conditions and/or feedback information.

Moreover the 3rd pre-coding matrix that is used for the subcarrier of the 3rd index can little move to the second pre-sign indicating number matrix partially mutually and set up by using.Similarly, all the other pre-coding matrixes of predetermined matrices to the last can be set up according to aforementioned processing.

Matrix reconfigures module 133-1 can be configured to the particular column quantity of selection corresponding to the spatial reuse rate of being set up each pre-coding matrix that module 131 set up by this pre-coding matrix (for example 1 or 2), and ignores residue (perhaps unselected) row when reconfiguring this pre-coding matrix.Herein, pre-coding matrix can only be set up according to the row of selecting.Moreover, can select to be listed as arbitrarily by pre-coding matrix as this particular column, perhaps can be according to regulation Scheme Choice particular column.

At last, precoding module 134-1 can be configured to by replacing or distributing corresponding to OFDM symbol to each pre-coding matrix of determining of subcarrier and carry out precoding.

The pre-coding scheme based on phase shift of broad sense

Aforementioned is to be 2 system according to having four (4) transmitting antennas and spatial reuse rate about configuration based on the discussion of the pre-coding matrix of phase shift.As previously mentioned, aforementioned discussion also can be used to have the Nt antenna number (Nt is more than or equal to 2 and for natural number) and spatial reuse rate is the system of R (R＞1 and be natural number).But can using aforesaid processing, this application implemented or user's formula 13 is summarized.

[equation 13]

Cf. equation 13, the matrix notation on equal sign ('=') the right is used for the unitary matrice of phase shift, and matrix U satisfies for being used to $U_{N_t\&times;R}^H\&times;U_{N_t\&times;R}^H=I_{R\&times;R}$ The unitary matrice of specific purpose.

Moreover if system has two (2) transmitting antennas and uses 1 bit code book, then the pre-coding matrix based on phase shift can be represented as shown in equation 14.

[equation 14]

Cf. equation 14, in case because being determined, α can determine β relatively easily, so α can be preset two (2) numerical value and can be sent back to by the form of code book index about the information of this default value.For instance, if this feedback code book index is 0, α can be 0.2, and if the feedback code book index is 1, then α can be 0.8.This numerical value can be determined in advance and be shared between this transmitter and receiver.In addition, every row can be assigned to different user.

As the example of matrix U, the regulation pre-coding matrix can be used to reach the signal to noise ratio (snr) diversity gain.So far, if use the Walsh sign indicating number, then should can be represented as shown in equation 15 based on the pre-coding matrix P of phase shift.

[equation 15]

${\mathrm{<figure-callout\; id="4"\; label="P"\; filenames="A2007800348160037H1.png,A2007800348160037H2.png"\; state="\{\{state\}\}">P</figure-callout>}}_{4\&times;4}^k=\frac{1}{\sqrt{4}}\left(\begin{array}{cccc}{e}^{{\mathrm{j\&theta;}}_1\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="A2007800348160036H1.png,A2007800348160041H2.png"\; state="\{\{state\}\}">k</figure-callout>}}& 0& 0& 0\\ 0& e^{j{\mathrm{\&theta;}}_2\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="A2007800348160036H1.png,A2007800348160041H2.png"\; state="\{\{state\}\}">k</figure-callout>}}& 0& 0\\ 0& 0& e^{j{\mathrm{\&theta;}}_3\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="A2007800348160036H1.png,A2007800348160041H2.png"\; state="\{\{state\}\}">k</figure-callout>}}& 0\\ 0& 0& 0& e^{j{\mathrm{\&theta;}}_4\mathrm{<figure-callout\; id="1"\; label="k"\; filenames="A2007800348160030H1.png,A2007800348160031H1.png"\; state="\{\{state\}\}">k</figure-callout>}}\end{array}\right)\left(\begin{array}{cccc}1& 1& 1& 1\\ 1& -1& 1& -1\\ 1& 1& -1& -1\\ 1& -1& -1& 1\end{array}\right)$

Cf. equation 15, it is to be 4 system according to having four (4) transmitting antennas and spatial reuse rate.Herein, second matrix on this equal sign the right (for example is represented as 1s and reaches-1s) can be reconfigured to select specific antenna (for example day line options) and/or to adjust spatial reuse rate (for example speed adjustment).

Equation 16 expressions reconfigure unit matrix for select two (2) antennas in the system with four (4) transmissions or virtual-antenna.

[equation 16]

${\mathrm{<figure-callout\; id="4"\; label="P"\; filenames="A2007800348160037H1.png,A2007800348160037H2.png"\; state="\{\{state\}\}">P</figure-callout>}}_{4\&times;4}^k=\frac{1}{\sqrt{4}}\left(\begin{array}{cccc}{e}^{{\mathrm{j\&theta;}}_1\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="A2007800348160036H1.png,A2007800348160041H2.png"\; state="\{\{state\}\}">k</figure-callout>}}& 0& 0& 0\\ 0& e^{j{\mathrm{\&theta;}}_2\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="A2007800348160036H1.png,A2007800348160041H2.png"\; state="\{\{state\}\}">k</figure-callout>}}& 0& 0\\ 0& 0& e^{j{\mathrm{\&theta;}}_3\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="A2007800348160036H1.png,A2007800348160041H2.png"\; state="\{\{state\}\}">k</figure-callout>}}& 0\\ 0& 0& 0& e^{j{\mathrm{\&theta;}}_4\mathrm{<figure-callout\; id="0"\; label="k"\; filenames="A2007800348160036H1.png,A2007800348160041H2.png"\; state="\{\{state\}\}">k</figure-callout>}}\end{array}\right)\left(\begin{array}{cccc}0& 0& 1& 1\\ 0& 0& 1& -1\\ 1& 1& 0& 0\\ 1& -1& 0& 0\end{array}\right)$

As previously mentioned, the spatial reuse rate can change or change owing to the various factorss such as influence that comprise time and/or channel conditions.Following table 2 shows a kind of method, its reconfigure this equal sign the right second matrix (by 0s, 1s and-1s is represented) with (or in changing) spatial reuse rate to changing.

[table 2]

With reference to table 2, first row, first and second row and/or first to fourth leu are selected according to reusability (for example reusability 1,2 or 4).Yet this reusability (perhaps Lie selection) is not limited to the example of table 2, can select any of four row but reusability can be (1).Moreover, if reusability is two (2), then can select wantonly two row (for example 1-2,2-3,3-4 or 4-1) of four row.

Moreover one in the table 2 in matrix or multiple row can be assigned to different user to share the spatial domain resource.

In addition, second matrix can be provided for transmitter and receiver by the form of code book.In this case, transmitter can receive the index information of this code book from receiver.After this, transmitter can be from the unitary matrice (for example second matrix) of this manipulative indexing of codebook selecting and user's formula 13 with the pre-coding matrix of configuration based on phase shift.

Moreover the circulation delay numerical value that is used for based on the pre-coding matrix of phase shift can be at transmitter and the predetermined numerical value of receiver.Alternatively, this numerical value can be the numerical value that is provided for this transmitter by this feedback information.Moreover this spatial reuse rate R can be the predetermined value in transmitter and receiver.Yet, at receiver periodic measurement channel conditions and after the computer memory reusability, this spatial reuse rate R can be provided for transmitter with feedback information by receiver.Herein, transmitter can use the channel information of sending back to from receiver to calculate and/or to control this spatial reuse rate.

About additional description relevant and/or more details with embodiments of the invention, can be with reference to Korea S invention No.2006-97216 that filed an application on October 2nd, 2006 and the korean patent application book No.2007-37008 that filed an application on April 16th, 2007, it is included in the reference.

Be used to implement first precoder of broad sense based on the pre-coding scheme of phase shift

The first precoder 130-2 comprises pre-coding matrix determination module 131-2, Antenna Selection Module 132, matrix and reconfigures module 133-2 and precoding module 134-2.

Particularly, pre-coding matrix determination module 131-2 can be configured, to determine pre-coding matrix based on phase shift by satisfying to multiply each other about second matrix (for example equation 13) of the condition of first matrix and unitary matrice.

Antenna Selection Module 132 can be configured to be selected to have corresponding to specific antenna size by second matrix (for example equation 16) (at least one of 0＜n＜N) be matrix partly, and is the specific antenna that zero (0) selects to be used for transfer of data by all elements of configuration except this selecteed element for n * n.

Matrix reconfigures module 133-2 can be configured to the number of columns of selection corresponding to the spatial reuse rate of second matrix (for example table 2), and reconfigures second matrix in order to the row that only use this selection.

Though preamble is not addressed, also has other assembly that needed transmitter is gone up in other operations.For instance, for example the internal memory (not shown) can be used to store various information, receiver circuit (not shown) and can be used to the various assemblies that receiving feedback information and controller (not shown) can be used to control this transmitter.

Specifically, this internal memory can store and be used for encoding and modulation (AMC) scheme for the support adaptability channel based on the pre-coding matrix of phase shift and/or the code book and encoding scheme (MCS) question blank of modulation.This code book can comprise with based on relevant at least one of the pre-coding matrix of phase shift and at least one relevant with each matrix index.Moreover this MCS question blank can comprise relevant at least one, at least one relevant with modulation scheme and at least one relevant with the MCS level index with encoding rate with the information bit that will be used to import.

Receiver circuit can receive transmission signals, change this received signal by antenna from receiver is that digital signal and the signal that transmits this digital translation are to controller.The signal of this reception can comprise the information as channel quality information (CQI).This CQI can be included in the feedback information and can be used to provide information about channel conditions, encoding scheme and/or modulation scheme.Particularly, this CQI can be relevant with the index based on the pre-coding matrix of phase shift, relevant with the index of specific coding rate and/or modulation scheme or modulation size.As index information, can use the MCS level index.

Embodiment #2

In another embodiment of the present invention, can be used to more effectively scheduled transmission power so that increase transmission reliability and transmittability according to the precoding of code book.Moreover the method may be implemented in transmitter and the receiver.

Fig. 9 is an exemplary plot, and its explanation is according to the transmitter of this embodiment #2.With reference to embodiment #1, transmitter 100 comprises scheduler/multiplexer 110, a plurality of channel encoder/modulator (120-1～120-N), precoder 130, a plurality of serial/parallel (SP) transducer (140-1～140-Nt), a plurality of modulator (150-1～150-Nt).

With reference to Fig. 9, this transmitter comprises scheduler/multiplexer 210, a plurality of channel encoder/modulator (220-1～220-N), precoder 240, a plurality of serial/parallel (SP) transducer (250-1～250-Nt), a plurality of modulator (260-1～260-Nt).In addition, more comprise precoder according to code book 230.

For differentiate by precoder 240 carry out based on the performed precoding based on phase shift (being called precoding #1) of the precoding of code book and precoder 130, this precoding based on code book will be called as precoding #2.Precoding #2 is relevant with scheme, can reach the SNR gain as feedback by the index of the pre-coding matrix known to receiver receiver/transmitter and receiver whereby.

Figure 10 is an exemplary plot, the processing of its explanation transmitter and receiver in supporting based on the multiaerial system of the precoding of code book.With reference to Figure 10, this transmitter and this receiver respectively have fixedly pre-coding matrix (P ₁～P _L).This receiver can use channel information to transmit best pre-coding matrix index as feeding back to this transmitter.After receiving this feedback information, the precoder 240 of this transmitter can be used the pre-coding matrix (X to the index that should transmit data subsequently ₁～X _Mt).

Table 3 shows and can be applied to having the example that two (2) transmitting antennas and spatial reuse rate are the code book of 2 system, and this system uses the feedback information of 3 bits.

[table 3]

If based on the precoding of code book and used simultaneously based on the precoding of phase shift, then transmitter can regularly receive this receiver preferable precoding index information, CQI and have the best frequency range that maybe can accept channel conditions.Based on this feedback information, this transmitter can use this identical precoding index and can carry out the scheduling that passes toward the preferred flow of data of different receivers (for example MS) on same frequency and identical time frame.

Moreover the internal memory of embodiment #2 can comprise that compared to embodiment #1 more code books are for precoding.Moreover the receiving circuit (not shown) of embodiment #2 can receive about the more information of code book index with from this codebook selecting pre-coding matrix compared to the receiving circuit of embodiment #1.

Transmitter and receiver about embodiment #1 and #2 can comprise that the interleaver (not shown) interweaves so that be minimized in the loss that noise caused in the transmission data for carrying out by the analysis of encoding bit.Moreover inverse fast fourier transform conversion (IFFT) (not shown) can be included to for the subcarrier of the transmission symbol that distributes precoding to the time domain.In addition, also can comprise that about the transmitter of embodiment #1 and #2 and receiver the filter (not shown) is a high-frequency signal for the conversion transmission symbol, and comprise the analog converter (not shown).

Moreover, below discuss with in multi-user, multiaerial system based on the emulation of the precoding of phase shift or test relevant.Table 4 shows the result that this emulation maybe should be tested.

[table 4]

Parameter	Configuration
		System configuration	3GPP LTE system (OFDMA formula down link)
The OFDM parameter	5MHz (300+1 subcarrier)
		Subframe lengths)	??0.5ms
The Resource Block size)	75 subcarrier * 4OFDM symbols
		Channel model	ITU Pedestrian A, typical urban (6-light)
Translational speed (km/h)	??3

Modulation scheme and channel encoding rate	?QPSK(R＝1/3，1/2，3/4) ?16-QAM(R＝1/2，5/8，3/4) ?64-QAM(R＝3/5，2/3，3/4，5/6)
		Chnnel coding	Turbo code assembly decoder:: max-log-MAP
The MIMO pattern	?MU-MIMO
		Resource allocation	The compartmentalization pattern
Antenna configurations	?[2Tx，2Rx]
		Spatial coherence (Tx, Rx)	?(0％，0％)，(70％，70％)
The MIMO receiver	The MMSE receiver
		Channel estimating	Perfect channel estimating
??H-ARQ	Bit levels is followed the tracks of the maximum quantity of transmission again in conjunction with (chase combining): 3TTIs is the quantity of transmission delay again: 3TTIs

Figure 11 A is an exemplary plot, and its explanation does not have the comparison between conventional P ARC in the environment of spatial coherence and the method for the present invention in ITU PedA channel.Figure 11 B is an exemplary plot, and its explanation is the comparison between conventional P ARC and the method for the present invention in 70% the environment at spatial coherence.

With reference to Figure 11 A and 11B, always foundation output of the present invention is higher than the sending method of PARC, no matter what kind of the spatial coherence of this transmitter and receiver is.Moreover if the spatial coherence of this transmitter and receiver increases, then difference to each other can obviously be amplified.That is to say, cause the lifting of overall transfer ability owing to the reduction of multi-user interference.

Figure 12 A is an exemplary plot, and its explanation is the comparison between conventional P ARC and the method for the present invention in having the TU channel that high frequency selects.Figure 12 B is another exemplary plot, and its explanation is the comparison between conventional P ARC and the method for the present invention in having the TU channel that high frequency selects.

With reference to Figure 12 A, the difference between this PARC and the present invention is minimum, no matter this spatial coherence how.In Figure 12 B, the spatial coherence of this transmitter and receiver is 70%, and then the SNR gain that causes based on the precoding of code book causes this output to be raised 15%.

Those skilled in the art may appreciate that in the present invention to have various modifications and variation, and do not deviate from spirit of the present invention and scope.Therefore, wish that the present invention contains these modifications of the present invention and variation, as long as it is in claims and the equivalent regions thereof.

Claims (18)

1. one kind is used a plurality of subcarriers to send the method for data in multi-aerial radio communication system, and described method comprises:

From mobile radio station (MS) receiving feedback information;

The feedback information that uses described reception will be to will independently carrying out chnnel coding and modulation by the user data of each antenna transmission;

Be identified for making the phase angle of described user data to increase the pre-coding matrix based on phase shift of fixing amount; And

Use described definite pre-coding matrix that described user data is carried out precoding based on phase shift.

2. definite step of the method for claim 1, wherein described pre-coding matrix based on phase shift comprises uses first matrix being used for phase shift, and with described first matrix and second matrix multiple so that described first matrix becomes unitary matrice.

3. method as claimed in claim 2, wherein, described first matrix is the diagonal matrix that the phase angle evenly increases along with row, and described second matrix is the pre-coding matrix based on phase shift that satisfies the unitary matrice condition.

4. method as claimed in claim 3, wherein, described second matrix is selected from code book, it comprises the matrix with relatively low spatial reuse rate, and is configured to have the part of another matrix of relative higher spatial reusability.

5. method as claimed in claim 3 further comprises:

From the row of described second matrix selection corresponding to the specific quantity of spatial reuse rate; And

Only the column weight with described selection newly disposes described second matrix.

6. method as claimed in claim 4, wherein, the product of described first matrix and second matrix is

Wherein, θ _iThe expression phase value, k represents the index of subcarrier or the index of resource, N _tThe quantity of expression transmitting antenna or virtual-antenna, and R representation space reusability.

7. the method for claim 1 more comprises execution based on the precoding of the code book channel power for each transmitting antenna of scheduling.

8. the method for claim 1, wherein described pre-coding matrix based on phase shift is

And wherein, k represents the index of subcarrier or the index of resource, w _{I, j} ^k(i=1 ..., N _t, j=1,1 ..., R) expression is according to the definite complex weighted value of k, N _tThe quantity of expression transmitting antenna or virtual-antenna, and R representation space reusability.

9. method as claimed in claim 8, wherein, described pre-coding matrix based on phase shift is to derive by using described precoding to unitary matrice based on phase shift.

10. method as claimed in claim 9, wherein, based on satisfied two conditions of the pre-coding matrix of phase shift, first condition is

${\left|w_{\mathrm{1,1}}^k\right|}^2+{\left|w_{\mathrm{2,1}}^k\right|}^2+...+{\left|w_{N_t,1}^k\right|}^2=1,$

${\left|w_{1,2}^k\right|}^2+{\left|w_{2,2}^k\right|}^2+...+{\left|w_{N_t,2}^k\right|}^2=1,$

.

${\left|w_{1,R}^k\right|}^2+{\left|w_{2,R}^k\right|}^2+...+{\left|w_{N_t,R}^k\right|}^2=1,$

And second condition is

$w_{\mathrm{1,1}}^{k*}{w}_{\mathrm{1,2}}^k+w_{\mathrm{2,1}}^{k*}{w}_{\mathrm{2,2}}^k+...+w_{N_t,1}^{k*}{w}_{N_t,2}^k=0,$

$w_{\mathrm{1,1}}^{k*}{w}_{\mathrm{1,3}}^k+w_{\mathrm{2,1}}^{k*}{w}_{\mathrm{2,3}}^k+...+w_{N_t,1}^{k*}{w}_{N_t,3}^k=0,$

.

$w_{\mathrm{1,1}}^{k*}{w}_{1,R}^k+w_{\mathrm{2,1}}^{k*}{w}_{2,R}^k+...+w_{N_t,1}^{k*}{w}_{N_t,R}^k=0.$

11. the emission and the receiving system of a plurality of subcarriers of use in multi-user, multiple antenna communication, it comprises:

Channel encoder and modulator, it is configured to independently carry out chnnel coding and modulation from the feedback information of receiving system for the user data on each antenna by using; And

First precoder, it is configured to determine based on the pre-coding matrix of phase shift and uses described definite pre-coding matrix based on phase shift that described user data is carried out precoding,

Wherein, described pre-coding matrix based on phase shift is determined according to the phase angle of the user data that increases each antenna regularly.

12. device as claimed in claim 11, wherein, described first precoder comprises that matrix reconfigures module, is used to select a plurality of row corresponding to the spatial reuse rate, and only uses the described matrix of the new configuration of column weight of described selection.

13. device as claimed in claim 11, wherein, described first precoder comprises the pre-coding matrix determination module, use for by first matrix and second matrix multiple are determined described pre-coding matrix based on phase shift relevant and described second matrix of described first matrix and be that unitary matrice is relevant with described first matrix conversion with phase shift.

14. device as claimed in claim 13, wherein, described first matrix is the phase angle along with row are fixed the diagonal matrix that increases, and described second matrix is the matrix that satisfies the unitary matrice condition.

15. device as claimed in claim 13, wherein, the product of described first matrix and described second matrix is

Wherein, θ _iThe expression phase value, k represents the index of subcarrier or the index of resource, N _tThe quantity of expression transmitting antenna or virtual-antenna, and R representation space reusability.

16. device as claimed in claim 15 more comprises matrix and reconfigures module to be used for:

From the row of described second matrix selection corresponding to the specific quantity of spatial reuse rate; And

Only the column weight with described selection newly disposes described second matrix.

17. device as claimed in claim 11 more comprises second precoder to be used to carry out precoding based on code book to dispatch the channel power of each transmitting antenna.

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