WO2012113185A1

WO2012113185A1 - Method and apparatus for preprocessing and transmitting transmission signal

Info

Publication number: WO2012113185A1
Application number: PCT/CN2011/075435
Authority: WO
Inventors: 宁迪浩; 朱登魁; 肖华华; 鲁照华
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-02-22
Filing date: 2011-06-08
Publication date: 2012-08-30
Also published as: CN102647247A; CN102647247B

Abstract

A method and an apparatus for preprocessing and transmitting transmission signal are disclosed in the invention. The method includes that: W _1,k and W _2,k , which are the independent and optimal pre-coding vectors of a first transmission terminal and a second transmission terminal to the k^th user, are calculated by the first transmission terminal and the second transmission terminal respectively according to downlink channel coefficient matrixes H _1,kand H _2,kof the k^th user acquired through measurement or feedback; phase circumrotation is not performed for the transmission signal of the first transmission terminal, that is, the phase circumrotation matrix is R₁=1, and a final pre-coding vector of the first transmission terminal is W ^~ _1,k=W _1,k; a phase circumrotation matrix R₂ of the second transmission terminal is calculated, and a final pre-coding vector of the second transmission terminal is calculated by W ^~ _2,k= W _2,k•e ^jθ according to the phase circumrotation matrix R₂ of the second transmission terminal, wherein e ^jθis a phase circumrotation factor; the final pre-coding vectors W ^~ _1,kand W ^~ _2,kare made as processing weight values of the transmission sides which are used to multiply the respective original transmission signals, and the obtained results by multiplying are transmitted through antennas as final transmission signals. The invention reduces interference at the edge of cells and improves the frequency spectrum efficiency at the edge of cells.

Description

Transmitting signal pre-processing transmitting method and device

The present invention belongs to the field of wireless communication technologies, and in particular, to a method and a device for transmitting and transmitting a signal. Background technique

With the continuous development of multi-antenna communication technology, it is found that for the current cellular network topology, the standard 802.16e/m and long-term evolution of OFDM A (Orthogonal Frequency Division Multiple Access) technology In the practice of LTE, Long Term Evolution, etc., the true-frequency networking has not been realized in practice, resulting in high spectral efficiency and low networking efficiency of isolated cells. In addition to the cell edge rate problem, the average frequency of the same frequency network is also significantly reduced. The same frequency network is one of the most important problems faced by the Worldwide Interoperability for Microwave Access (WiM AX) and LTE in the current OFDM A standard. Multi-point transmission performs simultaneous co-frequency (cooperative) multi-point transmission through different radio remote units (RRUs), base stations (BS, Base Stations) and their associated relay stations (Relays). Technical measures for edge interference, improving spectrum efficiency at the cell edge, and increasing effective coverage. Single-site multi-antenna technology or non-multi-point transmission technology can increase the data transmission rate, but it can not significantly improve the performance of the cell edge, and the multi-antenna technology has many working modes such as multiplexing, beamforming and other technologies. Sex is not very good; and through multi-point cooperation, virtual MIMO (Multiple Input Multiple Output) can be constructed, which can increase cell edge performance and is not very demanding on the terminal.

A plurality of neighboring base stations, which may be a BS, a relay, a femto base station (femeto) and a plurality of user terminals communicating on the same time-frequency resource, are called multi-point transmission technologies, as shown in FIG. Technologies include cooperative multipoint transmission (Comp) technology and distributed precoding technology (DPS, Distributed Precode Scheme, where coordinated multipoint transmission includes CoBend Beamforming (CB) and Joint Processing (JP, Joint Processing).

Joint processing technology, although it can obtain superior data transmission performance, each participating base station needs to acquire channel information between each user and all cooperative base stations, and the information transmission amount is very large, and the uplink channel and The interface between base stations is a huge challenge, so in practice, people tend to retreat to the second best data transmission mode, that is, each cooperative base station only obtains all users to their own channel information (so-called local information, Local CSI And then use this information for optimal precoding processing to expect interference avoidance and maximize transmission, which is the idea of distributed precoding.

For a distributed precoding system, if there are ^ cooperative base stations composing a cooperative set ^ and simultaneously transmitting data for each user, the data received by the user can be expressed as:

Y, =∑HW _{; A} +XXH W _; , ₇ S _; +η,

,=1

i* ^k ( 1 )

N _r

Where ^{e C} represents the channel coefficient matrix between the first base station and the first user, k ^{€ D} represents the precoding matrix between the first base station and the first user, indicating user correspondence

∑∑HW,, _jS

The number of data streams, where ^ ... represents the user's desired signal, ~ represents the interference between multiple users, and n _fe represents the antenna noise vector.

For such a distributed precoding system, the key to its excellent reception performance is whether the user k expects to receive the signal term '·= ι '' to perform coherence combining because it is generally a complex coefficient vector. When they are directly superimposed, they are likely to cause mutual cancellation, so that the gain is impaired or reduced to 0, so only when H ¹ ^, with the same phase, can the real multi-base station be obtained. Combine gain.

Let's use a concrete example to explain what is a coherent merge. Take a two-dimensional real number vector as an example. For real numbers, the equivalent vectors have opposite directions, ie δ ^ -δ , so for the two vectors δ and 6 shown in Figure 2, in order to maximize Ι ^{3 + β} Ι , an equivalence relation can be used. When the angle between δ and 6 is an acute angle, Ι ^δ+β Ι is the largest. When the angle with 6 is obtuse, it is obvious that ΙΙ ^δ+ (_ ^β )ΙΙ is the largest.

.

Therefore, in order for the user k to coherently combine the desired signal components in the received signal on the receiving side, the base station side needs to phase rotate the transmitted signal, and thus the formula (1) becomes

Here, ^ denotes the phase rotation matrix of the i-th base station. For a single-stream transmission system, the result of the product of ^H " ^W " in equation (2) is a complex number, at which point the rotation matrix ^ degenerates to a complex value of unit modulus.

In summary, in the downlink distributed precoding, in the scenario of single-stream transmission, the base station side performs phase rotation to enable the receiving side to perform the merging, and the key lies in the rotation matrix, how to obtain the optimal rotation matrix, There are urgent problems to be solved at this stage. Summary of the invention

In view of this, the present invention provides a method and a device for transmitting and transmitting pre-transmission signals, which solves the problem of related merging in the multi-point transmission technology, thereby reducing co-channel interference during system transmission.

The present invention provides a method for transmitting and transmitting a signal pre-processing, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, and the method includes:

The first transmitting end and the second transmitting end respectively calculate the optimal precoding vectors W _w and W for the kth user independently according to the kth user downlink channel coefficient matrix Hw and H ₂ , _fc obtained by measurement or feedback. ₂ , _fc ;

No phase rotation is performed on the transmitted signal of the first transmitting end, the phase rotation matrix = 1 , the first round The final precoding vector of the sending end is W^ = W^;

Calculating a phase rotation matrix of the second transmitting end, according to a phase rotation matrix of the second transmitting end

R ₂ , calculating a final precoding vector of the second transmitting end ^^=^^.^, which is a phase rotation factor; and using the final precoding vector sum as the transmitting side processing weight, multiplying the original processing weight by the original original The signal is transmitted, and the result obtained by multiplying is transmitted as a final transmission signal through the antenna.

According to an aspect of the present invention, a method for transmitting a pre-processing of a transmitted signal is provided, which is applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, the method comprising:

The first transmitting end, the second transmitting end, and the third transmitting end respectively calculate, according to the kth user downlink channel coefficient matrix Hw, H ₂ , _k and H ₃ , _k obtained by measurement or feedback, respectively, for each of the kth users. The most abrupt precoding vectors W _k , W _2>3⁄4 and W _u ;

No phase rotation is performed on the transmission signal of the first transmitting end, that is, the phase rotation matrix=1, and the final precoding vector of the first transmitting end is = W _k ;

Calculating phase rotation matrices R ₂ and R _{3 of the} second transmitting end and the third transmitting end, and calculating finals of the second transmitting end and the third transmitting end according to the phase rotation matrices R ₂ and R ₃ of the second transmitting end and the third transmitting end respectively Precoding vector = ₂ · e ^p , W _u = W · e ^A ; The final precoding vector Ww, and the processing weight of the transmission side are multiplied by the original transmission signal by the transmission side processing weight, and multiplied The resulting result is sent as a final transmitted signal through the antenna.

In addition, the present invention further provides a transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, and the apparatus includes:

Precoding vector calculation module for the kth user downlink letter obtained according to measurement or feedback The channel coefficient matrices HW and H ₂ calculate respective optimal precoding vectors w _w and ^ for the kth user independent;

a first pre-coding pre-coding vector calculation module, configured to determine a final pre-coding vector of the first transmitting end as Ww=W _{l fc} . A final pre-coding vector calculation module, configured to calculate a phase rotation matrix R _{2 of the} second transmitting end, according to Phase rotation matrix of the second transmitting end? ₃ , calculating the final precoding vector of the second transmitting end

And a data sending module, configured to use the transmitting side processing weights to multiply the respective original transmitting signals by using the transmitting side processing weights as the transmitting side processing weights, and use the multiplied result as the final transmitting signal to be sent through the antenna.

The present invention further provides a transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, the apparatus comprising: a precoding vector calculating module, configured to Measure or feedback the obtained kth user downlink channel coefficient matrices H _lfc , H ₂ , _fc and H ₃ , and calculate respective optimal precoding vectors w _w , w ₂ ^w _k for the kth user;

a first pre-coding pre-coding vector calculation module, configured to determine that a final pre-coding vector of the first transmitting end is Ww=W _{l fc} ;

The final pre-coding vector calculation means for calculating a second sending end, the third phase rotation matrix R of the transmission side _2, R _3, respectively, the rotation matrix R according to a second phase the transmitting side, the transmitting side of the third _2, R _3, Calculation The final precoding vector W^=W ₂ , _fc , W _u = W · e ^{A of the} second transmitting end and the third transmitting end; the data sending module is configured to use the final precoding vector and the processing weight as the transmitting side, The transmit side processing weight is multiplied by the respective original transmit signal, which will be multiplied The result is sent out through the antenna as the final transmitted signal.

Through the above technical solution, by acquiring the phase rotation matrix, the receiving end can effectively coherently combine the signals transmitted by the multiple transmitting ends, thereby effectively utilizing the multi-point transmission technology, reducing the interference of the cell edge, and improving the cell. The edge spectrum efficiency increases the effective coverage of the cell. DRAWINGS

The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is a schematic diagram of a multipoint transmission technique in the prior art;

2 is a schematic diagram of coherent combining in the prior art;

3 is a flowchart of a technical solution when the number of cooperative base stations of the present invention is 2;

4 is a flow chart of a technical solution when the number of cooperative base stations of the present invention is 3. DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make the technical problems, technical solutions and beneficial effects of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Considering that the form and calculation method of the phase rotation matrix are different under the condition that the number of cooperative base stations is different, the calculation method of the rotation matrix when the number of cooperative base stations is 2 and 3 and single-stream transmission is respectively given.

The number of cooperative base stations is 2

As shown in FIG. 3, when the number of cooperative base stations is 2, the method includes:

1. The first transmitting end and the second transmitting end respectively calculate optimal precoding for each kth user according to the kth user downlink channel coefficient matrix Hw and H obtained by measurement or feedback. Vector ^^ and ^^;

2. The phase of the transmit signal of the first transmitting end is not rotated, that is, the phase rotation matrix is 1, and the final precoding vector of the first transmitting end is = W _uk ;

3. Calculating the phase rotation matrix of the second transmitting end? ₂ , calculating the final precoding vector of the second transmitting end according to the phase rotation matrix R ₂ of the second transmitting end ^^=^^.^.

4. The final precoding vector sum is used as the transmitting side processing weight, and the transmitting side processing weight value is multiplied by the original original transmitting signal, and the multiplied result is sent as the final transmitting signal through the antenna.

Further description will be made below, assuming that the base stations participating in the cooperation are the base station 1 and the base station 2, and the number of service users under the two cooperative base stations is K.

Use the following procedure to calculate the rotation matrix required for the two base stations to transmit to the kth user.

step 1

The base station 1 and the base station 2 respectively obtain the kth user downlink channel coefficient matrices H _13⁄4 and H _2i according to measurement or feedback, and calculate respective optimal precoding vectors W _13⁄4 and W ₂ for the kth user.

Step 2

The transmitted signal of the base station 1 is not phase rotated, that is, the phase rotation matrix is =1, and the final precoding vector of the base station 1 is = step 3

The transmission signal of the base station 2 is used to calculate the rotation matrix in one of two ways.

method 1:

量化 Quantizing the angle in the twiddle factor with n bits of information, that is, constructing a codeword set φ of quantized S, comprising a total of 2" codewords, wherein the mth codeword is AND (.m-l) + /3, m = l , 2,...,2" , /3 is Any constant. Select a codeword from the set^ to make the following formula get the maximum value.

^ = max|HW + H ₂ ,, W ₂ ^^

Where H _{l fc} and H _{2 k} represent the downlink channel coefficient matrix of base station 1 and base station 2 to user k, respectively, and the final precoding vector of base station 2 is = W _k · e ^{] e} .

Method 2:

直接 Calculate the phase rotation factor e ^{ie of} base station 2 directly using the following formula: wm

Where H _{l fc} and H _{2 k} represent the downlink channel coefficient matrix of base station 1 and base station 2 to user k, respectively, and the final precoding vector of base station 2 is = · .

Step 4

The cooperative base station uses the final precoding vector sum obtained by the above calculation to process the transmission signal as the transmission side processing weight, that is, multiply the transmission side processing weight by the respective original transmission signals, and multiply the result obtained as the final transmission. Signal, ie

Where ^ denotes the signal vector finally transmitted by the base station i to the user k, W is the final precoding vector of the i-th base station to the kth user, and s _fc is the original transmitted signal transmitted to the kth user. The number of cooperative base stations is 3

As shown in FIG. 4, when the number of cooperative base stations is 3, the method includes:

1. The first sending end, the second sending end, and the third sending end respectively calculate the kth user downlink channel coefficient matrices H _{l fc} , H ₂ , _k and H ₃ , _k obtained by measurement or feedback, respectively k user-independent final precoding vectors W _k , W _2rk and W _u ;

2 No phase rotation is performed on the transmitted signal of the first transmitting end, that is, the phase rotation matrix 9^ = 1 , The final precoding vector of the first transmitting end is = w _lk ;

3 ,, calculating a second sending end, the third phase rotation matrix R ₂ of the transmitting side, R _3, respectively, the rotation matrix R according to a second phase the transmitting side, the transmitting side of the third _2, R _3, calculating a second sending end, the third The final precoding vector at the transmitting end = W ₂ e ^A , W _u =W _u -e ^] ^;

4, using the final precoding vector Ww, and as the transmitting side processing weight, multiplying the transmission side processing weight by the respective original transmission signals, and multiplying the obtained result as a final transmission signal through the antenna.

Further description will be made hereinafter, assuming that the base stations participating in the cooperation are the base station 1, the base station 2, and the base station 3, and the number of service users under the three cooperative base stations is K.

The following steps are used to calculate the rotation matrix required for the three base stations to transmit to the kth user.

step 1

The base station 1, the base station 2, and the base station 3 respectively obtain the kth user downlink channel coefficient matrices H _w , H ₂ , _fc and H ₃ , _fc according to measurement or feedback, and calculate respective optimal precodings for the kth user independently. Vectors W _u , ^ _23⁄4 and ^ _33⁄4 .

Step 2

The transmitted signal of the base station 1 is not phase rotated, that is, the phase rotation matrix _{1 =} 1, and the final precoding vector of the base station 1 is = W _13⁄4 step 3

The base station 2, the base station 3's transmit signal 进行 uses one of the following two methods to calculate the rotation matrix. method 1:

量化 Quantizing the angle in the twiddle factor with n bits of information, that is, constructing the codeword set φ of the quantized S, comprising a total of 2" codewords, where the mth codeword is = ^(m- l) + /3, m = l , 2,...,2", /3 is an arbitrary constant. Select two codewords from the set ^, and find the sum of the maximum values of the following formula {Θ ₂ } = max H _u W _u + H ₂ , W ₂ , e^ + H _33⁄4 W ₃ where H _lk , H _2fc and H _3fc represent the downlink channels of base station 1, base station 2 and base station 3 to user k, respectively Coefficient matrix. The final precoding vector of the base station 2 is ^^=^^.^, and the final precoding vector of the base station 3 is W _w = W _{3 3⁄4} .

Method 2:

First, preclude the use of the following formula to calculate the phase rotation factor of the base station 2 _{_{_{^:; W t Hf, H}}} , t W, " where, H _lfc and H _2, _fc denote downlink channel base stations 1 and 2 to a user k.

Next, based on the phase rotation factor ^ of the obtained base station 2, the phase rotation factor of the base station 3 is calculated using the following formula

Where H _lk , H _2fc and H _3fc represent the downlink channels of the base station 1, the base station 2 and the base station 3 to the user k, respectively.

The final precoding vector of the base station 2 is = W ₂ e^, and the final precoding vector of the base station 3 is

W = W · ε ^Λ .

Step 4: The cooperative base station uses the final precoding vector obtained by the above calculation, and processes the transmitted signal as the transmission side processing weight, that is, multiplies the transmission side processing weight by the original original transmission signal, and multiplies the result. As the final transmitted signal, ie

P„ =W..„s„ Where ^ denotes the signal vector that base station i finally transmits to user k, w is the final precoding vector of the i-th base station to the kth user, and _Sfc is the original transmitted signal transmitted to the kth user.

The method and apparatus for calculating the phase rotation matrix of the distributed precoding described in the present invention will be described below in conjunction with specific application scenarios.

Example 1

In a distributed cooperative communication system, the number of base stations participating in the current cooperation is 2, and there are a total of K users in the current coordinated base station.

The base station 1 and the base station 2 respectively obtain the kth user downlink channel information H _lk and H _{2 k} according to measurement or feedback, and calculate respective optimal precoding vectors and W ₂ , _fc base station 1 for each kth user independent. The signal is not phase rotated, ie _{1 =} 1, and the final precoding vector of base station 1 is =^. From the pre-designed angle codebook, the base station 2 seeks an optimal rotation angle 根据 according to the following formula, so that the following formula holds:

^ = max|H _u W _u + H _23⁄4 W ₂ ^^ where H _lk and H _{2 k} represent the downlink channel coefficient matrix of base station 1 and base station 2 to user k, respectively, and the final precoding vector of base station 2 is = · .

Distributed precoding is accomplished by multiplying the final precoding vector calculated above by the original transmitted signal.

Example 2

In a distributed cooperative communication system, the number of base stations participating in the current cooperation is 2, and the number of users currently working in the set of coordinated base stations is one.

The base station 1 and the base station 2 respectively obtain the kth user downlink channel coefficient matrices H _lk and H _2k according to measurement or feedback, and calculate respective optimal precoding vectors _k and independent for the kth user. The transmitted signal of the base station 1 is not phase rotated, that is, =1, and the final precoding vector of the base station 1 is =.直接 Calculate the phase rotation factor e ^{ie of the} base station 2 directly using the following formula.

Where H _lk and H _{2 k} represent the downlink channel coefficient matrix of base station 1 and base station 2 to user k, respectively. The final precoding vector of base station 2 is = · .

Example 3

It is assumed that the base stations participating in the cooperation are the base station 1, the base station 2, and the base station 3, and the number of service users under the three cooperative base stations is Κ.

The base station 1, the base station 2, and the base station 3 respectively obtain the kth user downlink channel coefficient matrices H _w , H ₂ , _fc and H ₃ , _fc according to measurement or feedback, and calculate respective optimal precodings for the kth user independently. Vector W _lfc , ^ and ^

The base station 2 and the base station 3 seek an optimal rotation angle sum from the pre-designed codebook according to the following formula, so that the following formula holds:

Where H _lk , H _2fc and H _3fc represent the downlink channel coefficient matrix of the base station 1, the base station 2 and the base station 3 to the user k, respectively. The final precoding vector of base station 2 is =W _i e ^A , and the final precoding vector of base station 3 is W _w = W ₃ e ^A .

Distributed by multiplying the final precoding vector calculated above by the original transmitted signal Precoding.

Example 4

It is assumed that the base stations participating in the cooperation are the base station 1, the base station 2, and the base station 3, and the number of service users under the three cooperative base stations is K.

计算 Calculate the phase rotation factor of base station 2 using the following formula.

W ^H H ^H HW

⁶ ~|W«H^H _U W _U |

Where H _lfc and H ₂ , _fc represent the downlink channel coefficient matrix of base station 1 and base station 2 to user k, respectively.

Based on the obtained phase rotation factor ^ of the base station 2, the phase rotation factor of the base station 3 is calculated using the following formula

3 _=; Rm "m, _k

^{_{6 ~ | W ^ ¾H 3,}} ¾ W 3, ¾ + e ^ W ^ H ^ H 3, ¾ W 3, ¾, wherein, H _lk, H _2fc and _H 3fc respectively base station 1, base stations 2 and 3 to User k's downlink channel coefficient matrix.

The final precoding vector of base station 2 is =W _u -e^, and the final precoding vector of base station 3 is W = W · ε ^Λ .

It is to be noted that the method, except for those described in detail in the embodiments, is a prior art that is known or familiar to those of ordinary skill in the art without the inventive work. The present invention also provides a transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, and includes:

a precoding vector calculation module, configured to calculate respective optimal precoding vectors w _w and ^ for the kth user independent according to the kth user downlink channel coefficient matrix HW and H^ obtained by measurement or feedback;

a first pre-coding pre-coding vector calculation module, configured to determine a final pre-coding vector of the first transmitting end as w^=w _lfc . A final pre-coding vector calculation module, configured to calculate a phase rotation matrix R _{2 of the} second transmitting end, according to Phase rotation matrix of the second transmitting end? ₂ , calculating the final precoding vector of the second transmitting end

In addition, the present invention further provides another transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, including: a precoding vector computing module, Calculating respective optimal precoding vectors w _13⁄4 , w ₂ ^w _k for the kth user independently according to the kth user downlink channel coefficient matrices H _lfc , H and H^ obtained according to the measurement or feedback;

a first pre-coding pre-coding vector calculation module, configured to determine that a final pre-coding vector of the first transmitting end is w^=w _lfc ;

The final pre-coding vector calculation means for calculating a second sending end, the third phase rotation matrix R of the transmission side _2, R _3, respectively, the rotation matrix R according to a second phase the transmitting side, the transmitting side of the third _2, R _3, Calculation The final precoding vector of the second transmitting end and the third transmitting end = W ₂ e^, W = W - e^; a data sending module, configured to use the final precoding vector, W ₂ , _fc and W ₃ , _fc as the transmitting side processing weight, and multiply the original transmitting signal by the transmitting side processing weight, and multiply the result The final transmitted signal is sent out through the antenna.

The transmitting end in the present invention may be a control device such as a base station, a relay station, a radio remote device, or a pico base station in a downlink in a wireless communication system. Similarly, the user is a data signal for receiving the transmitting end, and the user may be a terminal device in the uplink in the wireless communication system, such as a mobile phone, a notebook computer, a handheld computer, or the like. The method and apparatus of the present invention are applicable to wireless communication systems such as LTE and WIMAX.

The above description shows and describes one or more preferred embodiments of the present invention, but as described above, it should be understood that the invention is not limited to the form disclosed herein, and It can be used in a variety of other combinations, modifications, and environments, and can be modified by the teachings or related art or knowledge within the scope of the inventive concept described herein. All changes and modifications made by those skilled in the art are intended to be within the scope of the appended claims.

Claims

Claim

A method for transmitting a signal pre-processing, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, wherein the method comprises:

The first transmitting end and the second transmitting end respectively calculate respective optimal precoding vectors W for the kth user according to the kth user downlink channel coefficient matrices HW and H obtained by measurement or feedback;

The phase of the first transmitting end is not rotated, the phase rotation matrix is =1, and the final precoding vector of the first transmitting end is Η^=Η. The phase rotation matrix of the second transmitting end is calculated, and the phase rotation matrix according to the second transmitting end is used.

R ₂ , calculating a final precoding vector Η^=Η^·^ of the second transmitting end, which is a phase rotation factor; and using the final precoding vector sum as a transmitting side processing weight, multiplying the original processing weight by the original original The signal is transmitted, and the result obtained by multiplying is transmitted as a final transmission signal through the antenna.

The transmit signal pre-processing transmission method according to claim 1, wherein the calculating the phase rotation matrix R ₂ of the second transmitting end is:

量化 Quantizing the angle in the twiddle factor with n bits of information, that is, constructing a codeword set φ of quantized S, comprising a total of 2" codewords, wherein the mth codeword is +?, m = l, 2, ..., 2 " , /3 is

Arbitrary constant, select a codeword from the set ^ to calculate the following formula to get the maximum value

_{^ = Max | HW + H 2} ,, the phase rotation matrix W ₂ ^^ a second transmission terminal, i.e., the phase rotation matrix.

The method for transmitting a pre-processing of a transmitted signal according to claim 1, wherein the calculating a phase rotation matrix of the second transmitting end is: Calculate the phase rotation matrix according to the formula = ., ^VV ".

|W^H^H W |

The transmitting signal pre-processing transmitting method according to claim 1, wherein the first and second transmitting ends comprise a base station, a relay station, and a 亳 pico base station.

The transmission signal pre-processing transmission method according to any one of claims 1 to 4, wherein the method is applicable to a Worldwide Interoperability for Microwave Access (WIMAX) or Long Term Evolution (LTE) wireless communication system.

A method for transmitting and transmitting a signal pre-processing, which is applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, wherein the method includes: a first transmitting end, a second The transmitting end and the third transmitting end respectively calculate the last possible precoding for the kth user independently according to the kth user downlink channel coefficient matrix H _w , H ₂ , _k and H ₃ , _k obtained by measurement or feedback. Vectors W _k , W _2rk and W _k ;

Calculating a phase rotation matrix R2, R3 of the second transmitting end and the third transmitting end, respectively calculating a final precoding vector of the second transmitting end and the third transmitting end according to the phase rotation matrix of the second transmitting end and the third transmitting end, and R _{3 respectively} W _k · e ^je , W _k = W _k · ε ^Ά ; the final precoding vectors ^ _fc , 1⁄2^ and 1⁄2^ are used as the transmission side processing weights, and the transmission side processing weights are multiplied by the respective original transmission signals, The result obtained by multiplying is transmitted as a final transmission signal through the antenna.

The transmitting signal pre-processing transmitting method according to claim 6, wherein the calculating a phase rotation matrix of the second transmitting end and the third transmitting end, and R ₃ is:

量化 Quantizing the angle in the rotation matrix ^ with n bits of information, that is, constructing a quantized codeword set φ, comprising a total of 2" codewords, wherein the mth codeword is AND (.m-l) + ?, m = l, 2,...,2" , β is Any constant. Select two codewords from the set ^, and find the sum of the maximum values of the following formula

{Θ ₂ } = max ||HW + H ₂ , W ₂ ^^ + H ₃ , _FC W

θ ₂ , θ ₃ φ ₃ Zf

The phase rotation matrix of the second transmitting end is e ^A , and the phase rotation matrix of the third transmitting end is e .

The transmit signal pre-processing transmission method according to claim 6, wherein the calculating a phase rotation matrix of the second transmitting end and the third transmitting end, and R ₃ is: calculating a phase rotation matrix of the second transmitting end ^ ,

According to the calculated phase rotation matrix of the second transmitting end, the phase rotation matrix of the third transmitting end is calculated by the following formula

W ^H , H ^H , H, , W, , + e ^i< W" Hf, H, , W, ,

The transmitting signal pre-processing transmitting method according to claim 6, wherein the first and second transmitting ends comprise a base station, a relay station, and a pseudo-pico base station.

The transmission signal pre-processing transmission method according to any one of claims 6 to 9, characterized in that the method is applicable to a WIMAX or LTE wireless communication system.

A transmitting signal pre-processing transmitting apparatus, which is applicable to a wireless communication system including a first transmitting end and a second transmitting end participating in cooperation, wherein the apparatus comprises:

a precoding vector calculation module, configured to calculate, according to the kth user downlink channel coefficient matrix H _w and H ₂ , _fc obtained by measurement or feedback, an optimal precoding vector and w ₂ , _fc respectively for the kth user independent ;

a first pre-coding pre-coding vector calculation module, configured to determine a final pre-coding vector of the first transmitting end as = w _{l fc} . A final pre-coding vector calculation module, configured to calculate a phase rotation matrix A of the second transmitting end, Calculating a final precoding vector of the second transmitting end according to the phase rotation matrix of the second transmitting end

a data sending module, configured to use a final pre-coding vector W _w and a processing weight of the transmitting side, multiply the original processing signal by the transmitting side, and multiply the result obtained by multiplying the result as a final transmitting signal through the antenna .

12. A transmitting signal pre-processing transmitting apparatus, applicable to a wireless communication system including a first transmitting end, a second transmitting end, and a third transmitting end participating in cooperation, wherein the apparatus comprises: a precoding vector calculating module, Calculating the optimal precoding vectors w _{l fc} , w ₂ for the kth user independently for the kth user downlink channel coefficient matrix H _{l fc} , H ₂ , _fc and H ₃ , _fc obtained according to the measurement or feedback. ^w _k ;

a first pre-coding pre-coding vector calculation module, configured to determine that a final pre-coding vector of the first transmitting end is =w _{l fc} ;

a final precoding vector calculation module, configured to calculate a phase rotation matrix of the second transmitting end and the third transmitting end, R ₃ , and calculate a second transmitting end according to a phase rotation matrix of the second transmitting end and the third transmitting end, and R ₃ respectively The final precoding vector of the third transmitting end ^ _fc = W ₂ , _fc , W _k = W _k · e ^A ; a data transmitting module for using the final precoding vectors ^ _fc , and W „ as the transmitting side processing weights, using The transmitting side processing weight is multiplied by the respective original transmitting signals, and the result obtained by multiplying is transmitted as a final transmitted signal through the antenna.