CN102025665B - Transmission method and equipment - Google Patents

Abstract

The invention discloses a transmission method and transmission equipment. The method is applied to an X channel consisting of a plurality of receivers and a plurality of transmitters and comprises: generating a pre-coding matrix for each of the plurality of receivers; pre-coding signal vectors to be transmitted to the plurality of receivers by using the pre-coding matrixes; and transmitting the pre-coded signal vectors to the plurality of receivers. According to the technical scheme provided by the embodiment of the invention, an X channel transmission scheme which is easy to implement and can provide high degree of freedom is provided.

Description

A kind of transmission method and equipment thereof

Technical field

Embodiments of the present invention are broadly directed to wireless communication technology, especially, relate to a kind of transmission method and equipment thereof.

Background technology

Along with the requirement to higher wireless data rates and better quality of wireless services increases fast, for cellular system, presence of intercell interference (ICI) has become serious day by day problem.In recent years, attracted a lot of attentivenesss about the research of so-called X channel, the X channel provide solve a kind of of ICI problem may approach.The X channel be have a plurality of transmitters and a plurality of receivers wireless system.Each transmitter sends independently message to each receiver, no matter and all do not have between the transmitter or between receiver collaborative, i.e. transmitter and receiver shared data information not.Compare with the complete cooperative approach of shared data completely of transmitter and receiver and channel information, the X channel all has much lower requirement to the transmission bandwidth and the propagation delay time of backbone network.Only compare from the interference channel of a transmitter reception message with each receiver, the X channel has certain advantage aspect the degree of freedom (DoF).

Because the good compromise between performance and complexity, the X channel becomes a kind of solution that is hopeful to solve the ICI problem.The realization technology that two kinds of X channels are arranged now, a kind of is collaborative multiple-input and multiple-output (Co-MIMO), another kind is to disturb alignment techniques (Interferencealignment).Co-MIMO allows a plurality of base stations (BS) to provide service simultaneously for the different mobile terminal (MS) in the different districts, and uses multi-user pre-coding to avoid presence of intercell interference under the situation that does not reduce resource utilization.Owing to only need local channel state information (CSI) (CSI in the X channel between this BS and all MS) at each place, base station, this technology is simple and be easy to realization, but can not obtain the maximum degree of freedom of X channel.Disturb alignment techniques can obtain the maximum degree of freedom of X channel, but all require overall CSI (CSI in the X channel between all BS and all MS) at each BS place, this is a kind of Utopian hypothesis, is difficult to realize in reality.

Therefore, need a kind of X Channel Transmission scheme that is easy to realize also can provide than high-freedom degree.

Summary of the invention

Embodiments of the present invention have proposed a kind of transmission method and equipment thereof.

According to an aspect of the present invention, propose a kind of transmission method, be used for the X channel of forming by a plurality of receivers and a plurality of transmitter.This method comprises: produce at each pre-coding matrix in a plurality of receivers; According in the pre-coding matrix corresponding one the signal phasor that will be sent to a plurality of receivers carried out precoding; Signal phasor after a plurality of receivers send precoding.

According to another aspect of the present invention, also proposed a kind of transmission method, be used for the X channel be made up of a plurality of receivers and a plurality of transmitter, this method comprises: receive the signal phasor from a plurality of transmitters; The signal phasor that sends for other receiver in a plurality of receivers in the signal phasor that filtering receives; Signal phasor after the filtering is decoded, to recover in a plurality of transmitters, to use the signal phasor of pre-coding matrix precoding respectively.

According to a further aspect of the invention, also proposed a kind of transmitter, be used for the X channel be made up of a plurality of receivers and a plurality of transmitter, this transmitter comprises: the pre-coding matrix generation unit is used for that each produces pre-coding matrix to a plurality of receivers; Precoding unit is used for according to corresponding one of pre-coding matrix the signal phasor that will be sent to a plurality of receivers being carried out precoding; And first Transmit-Receive Unit, be used to send the signal phasor after the precoding.

In accordance with a further aspect of the present invention, proposed a kind of receiver, be used for the X channel be made up of a plurality of receivers and a plurality of transmitter, this receiver comprises: second Transmit-Receive Unit is used to receive the signal phasor from a plurality of transmitters; Filter unit is used for the signal phasor that signal phasor that filtering receives sends for other receiver in a plurality of receivers; And codec unit, be used for the signal phasor after the filtering is decoded, to recover in a plurality of transmitters, to use the useful signal vector of pre-coding matrix precoding respectively.

According to a further aspect in the invention, propose a kind of communication system, comprised a plurality of above-mentioned transmitter and receivers.

By above-mentioned technical scheme, provide the X Channel Transmission scheme that is easy to realize also can provide than high-freedom degree.

Description of drawings

In conjunction with the accompanying drawings embodiments of the present invention are described in detail, can understand the present invention better, wherein:

Fig. 1 shows that transmitter is the base station in the embodiment of the present invention, and receiver is the system schematic of portable terminal;

Fig. 2 shows that receiver is the base station in the embodiment of the present invention, and transmitter is the system schematic of portable terminal;

Fig. 3 shows the structured flowchart of transmitter in the embodiment of the present invention;

Fig. 4 shows the structured flowchart of receiver in the embodiment of the present invention;

Fig. 5 shows the flow chart of X Channel Transmission in the embodiment of the present invention;

Fig. 6 shows the flow chart that pre-coding matrix generates in the embodiment of the present invention;

Fig. 7 shows the schematic diagram of performance simulation result in the embodiment of the present invention.

Embodiment

To a preferred embodiment of the present invention will be described in detail, having omitted in the description process is unnecessary details and function for the present invention with reference to the accompanying drawings, obscures to prevent that the understanding of the present invention from causing.

Embodiments of the present invention have proposed a kind of Fig. 1 and/or system shown in Figure 2, and this system comprises the Receiver And Transmitter of the following stated, wherein, in Fig. 1, transmitter is the base station, and receiver is a portable terminal, in Fig. 2, transmitter is a portable terminal, and receiver is the base station.

Embodiments of the present invention have also proposed transmitter as shown in Figure 3, comprise pre-coding matrix generation unit 310, are used for each generation pre-coding matrix of a plurality of receivers; Precoding unit 320 is used for according to corresponding one of pre-coding matrix the signal phasor that will be sent to a plurality of receivers being carried out precoding; First Transmit-Receive Unit 330 is used to send the signal phasor after the precoding.

This transmitter also comprises expanding element 350, is used for the signal phasor after sending precoding on a plurality of time slots or the subcarrier.

This transmitter also comprises selected cell 340, is used for selecting to obtain according to a plurality of transmitters and a plurality of receiver antenna number separately the portable terminal number of the maximum degree of freedom; Pre-coding matrix generation unit 310 also is used for according to selected portable terminal number each generation pre-coding matrix of a plurality of receivers.

This transmitter also comprises first memory cell 360, is used to store the parameter that above each unit uses.

Embodiments of the present invention have also proposed receiver as shown in Figure 4, comprise second Transmit-Receive Unit 410, are used to receive the signal phasor from a plurality of transmitters; Filter unit 420, be used for the signal phasor that signal phasor other receiver in a plurality of receivers that filtering receives sends, codec unit 430, be used for filtered signal phasor is decoded, to recover in a plurality of transmitters, to use the signal phasor of pre-coding matrix precoding respectively.

This receiver can also comprise matrix generation unit 450, is used to generate filtering matrix; If receiver is a portable terminal, second Transmit-Receive Unit 410 also is used for and will sends to a plurality of transmitters through the uplink detection signal after the conjugate transpose precoding of filtering matrix, so that a plurality of transmitter can utilize filtering matrix to each produces pre-coding matrix in a plurality of receivers; The signal phasor that signal phasor other receiver in a plurality of receivers that filter unit 420 also is used for utilizing the filtering matrix filtering to receive sends.

This receiver can also comprise extraction unit 440, and the signal phasor that is used for receiving on a plurality of time slots or the subcarrier is merged into a signal phasor.

This receiver can also comprise second memory cell 460, is used for storing the parameter that above each unit uses.

Though above with the formal description of the functional module of separating the transmitter and receiver of the embodiment of the invention, but each assembly shown in Fig. 3 and Fig. 4 can realize with a plurality of devices in actual applications, and a plurality of assemblies that illustrate also can be integrated in chip piece or the equipment in actual applications.Transmitter and receiver also can comprise any unit and the device that is used for other purpose.

The purpose of this programme is to be many separate channels with the X channel decomposing.In down link (DL), this X channel will be broken down into separate multiple access and insert (MA) channel, and in up link (UL), this X channel will be broken down into separate broadcasting (BC) channel.

Below with base station (BS) as transmitter, portable terminal (MS) is an example as receiver, in conjunction with Fig. 5 and Fig. 6 embodiments of the present invention is described.

Referring to Fig. 5, in step 510, the pre-coding matrix generation unit 310 of transmitter i is at first to each produces pre-coding matrix in a plurality of receivers.

With DL is example, and supposes the scene of two BS and three MS.Under this scene, the X channel will be broken down into 3 and not disturb the MA channel of (that is, separate) each other.For realizing this purpose, the pre-coding matrix of generation must meet the following conditions:

For receiver 1:

Ψ ₁H _1,1Q _2,1=0 and Ψ ₁H _1,1Q _3,1=0 (1a)

Ψ ₁H _1,2Q _2,2=0 and Ψ ₁H _1,2Q _3,2=0 (1b)

For receiver 2:

Ψ ₂H _2,1Q _1,1=0 and Ψ ₂H _2,1Q _3,1=0 (2a)

Ψ ₂H _2,2Q _1,2=0 and Ψ ₂H _2,2Q _3,2=0 (2b)

For receiver 3:

Ψ ₃H _3,1Q _1,1=0 and Ψ ₃H _3,1Q _2,1=0 (3a)

Ψ ₃H _3,2Q _1,2=0 and Ψ ₃H _3,2Q _2,2=0 (3b)

Wherein: H _{J, i}: the channel matrix from transmitter i to receiver j, Q _{J, i}: at the transmission to receiver j, the employed pre-coding matrix of transmitter i, Ψ _j: the employed matrix that accepts filter of receiver j, d _{J, i}: the number (DoF) of data flow from transmitter i to receiver j.Above constraints means that for receiver the signal that only aims at this receiver transmission could be by its matrix Ψ that accepts filter _j

Next, introduce the concrete steps that pre-coding matrix produces in conjunction with Fig. 6.

At first, the matrix generation unit 450 of each receiver j produces the matrix Ψ that accepts filter at random _j, codec unit 430 is used the conjugate transpose Ψ of this matrix then _j ^HCome a detection (sounding) burst is carried out precoding, second Transmit-Receive Unit 410 sends the detectable signal after the precoding.Different receivers sends separately detectable signal with orthogonal manner.

Then, the detectable signal sent by each receiver of each transmitter i is estimated

With the pre-coding matrix at receiver 1 is example, and in embodiments of the present invention, transmitter i is according to Ψ ₂H _{2, i}And Ψ ₃H _{3, i}Calculate Q _{1, i}

In step 610, according to Ψ ₂H _{2, i}Ψ is satisfied in acquisition ₂H _{2, i}Q _{1, i}=0 Q _{1, i}'.

Concrete steps can be to carry out Ψ ₂H _{2, i}SVD (singular value decomposition):

${\mathrm{\Ψ}}_2{H}_{2,i}=U\left[\begin{array}{cc}\mathrm{\Σ}& 0\\ 0& 0\end{array}\right]\left[\begin{array}{c}{V}^{{\left(1\right)}^H}\\ V^{{\left(0\right)}^H}\end{array}\right]---\left(4\right)$

Wherein, U and $\left[\begin{array}{c}{V}^{{\left(1\right)}^H}\\ V^{{\left(0\right)}^H}\end{array}\right]$ All be unitary matrice, ∑ is a diagonal matrix, and its diagonal element is Ψ ₂H _{2, i}Singular value.V ⁽¹⁾Singular vector by the singular value correspondence of non-zero is formed V ⁽⁰⁾Form by the singular vector that is zero singular value correspondence.With V ⁽⁰⁾Be elected to be Q _{1, i}'.

In step 620, according to Q _{1, i}' and Ψ ₃H _{3, i}Ψ is satisfied in acquisition ₃H _{3, i}Q _{1, i}'=0 Q _{1, i}"

Concrete steps can be to carry out Ψ ₃H _{3, i}Q _{1, i}' SVD decompose:

${\mathrm{\Ψ}}_3{H}_{3,i}{Q_{1,i}}^{\′}=U\left[\begin{array}{cc}\mathrm{\Σ}& 0\\ 0& 0\end{array}\right]\left[\begin{array}{c}{V}^{{\left(1\right)}^H}\\ V^{{\left(0\right)}^H}\end{array}\right]---\left(5\right)$

Wherein, Q _{1, i}" by V ⁽⁰⁾D _{1, i}Row constitute.

In step 630, based on Q _{1, i}' and Q _{1, i}" calculate Q _{1, i}:

Q _1，i＝Q _1，i′Q _1，i″ (6)

In like manner, transmitter i is from Ψ ₁And Ψ ₃The middle Q that calculates _{2, i}, from Ψ ₁And Ψ ₂The middle Q that calculates _{3, i}

Next, in step 520, the precoding unit 320 of transmitter i is based on Q _{J, i}To the signal s that will be launched _IjCarry out precoding:

X _j，i(t)＝Q _j，is _j，i(t) (7)

Wherein, s _{J, i}(t) be the signal phasor that transmitter i sends to receiver j, X _{J, i}(t) be signal phasor after the precoding.

In step 530, the transmitting element 330 of transmitter i sends the signal X after the precoding _{J, i}(t).

The parameter that is used in the above step can be stored in first memory cell 360 in advance, calls during for needs.

At receiver side, in the step 540, the signal that 410 couples of transmitter i of second Transmit-Receive Unit of receiver j send receives, and the signal that receives is:

$y_i\left(t\right)=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{H}_{j,i}\left(t\right)\underset{j^{\′}=1}{\overset{3}{\mathrm{\Σ}}}{X}_{j^{\′},i}\left(t\right)+n_j\left(t\right)---\left(8\right)$

In the step 550, the filter unit 420 of each receiver j is by the matrix Ψ that accepts filter _jCarry out filtering, can eliminate the interference of other user's signal.In embodiments of the present invention, three filtered signals of receiver are respectively:

y ₁＝Ψ ₁(H _1，1Q _1，1s _1，1+H _1，2Q _1，2s _1，2)+Ψ ₁n ₁

y ₂＝Ψ ₂(H _2，1Q _2，1s _2，1+H _2，2Q _2，2s _2，2)+Ψ ₂n ₂

y ₃＝Ψ ₃(H _3，1Q _3，1s _3，1+H _3，2Q _3，2s _3，2)+Ψ ₃n ₃

As seen, because the constraints from 1 (a) to 3 (b), only remaining signal and noise in the signal after accepting filter for this receiver transmission.Subsequently, because H _{J, i}, Q _{J, i}And Ψ _jAll known, in step 560, codec unit 430 can extract signal s respectively easily by combined decoding _{I, j}, wherein, for example, be the base station at transmitter, receiver is under the situation of portable terminal, H _{J, i}And Q _{J, i}Can inform receiver by descending training sequence by transmitter, and be stored in second memory cell 460.

The parameter that is used in step 540～560 can be stored in second memory cell 460, uses during for needs.

Simultaneously, as can be seen, only use local CSI in the embodiments of the present invention, promptly each transmitter i only need know between own and all receivers

, do not need exchange channel information between the transmitter, therefore be not subjected to of the influence of backbone network transmission delay, and reduced requirement, thereby be more convenient in real system, realizing the transmission bandwidth of backbone network to the CSI real-time.

Below the DoF performance of above-mentioned decomposition algorithm is analyzed.

In order to satisfy constraints (1a), following restriction is arranged in the selection of preconditioning matrix to (3b):

Q _{1, i}Must be at Ψ ₂H _{2, i}And Ψ ₃H _{3, i}The common factor of kernel in;

Q _{2, i}Must be at Ψ ₁H _{1, i}And Ψ ₃H _{3, i}The common factor of kernel in;

Q _{3, i}Must be at Ψ ₁H _{1, i}And Ψ ₂H _{2, i}The common factor of kernel in.

Produced following constraints thus:

d _1，1≤M-(d _2，1+d _2，2)-(d _3，1+d _3，2) (9a)

d _2，1≤M-(d _1，1+d _1，2)-(d _3，1+d _3，2) (9b)

d _3，1≤M-(d _1，1+d _1，2)-(d _2，1+d _2，2) (9c)

d _1，2≤M-(d _2，1+d _2，2)-(d _3，1+d _3，2) (9d)

d _2，2≤M-(d _1，1+d _1，2)-(d _3，1+d _3，2) (9e)

d _3，2≤M-(d _1，1+d _1，2)-(d _2，1+d _2，2) (9f)

Wherein, suppose that the antenna number of all transmitters is equal, M is the number of transmit antennas of transmitter.

In order to obtain glitch-free transmission, also should consider two constraintss: the total data streams number of each transmitter can not surpass the number of its transmitting antenna, and the total receiving data stream number of each receiver can not surpass the number of its reception antenna.

d _1，1+d _2，1+d _3，1≤M (10a)

d _1，2+d _2，2+d _3，2≤M (10b)

d _1，1+d _1，2≤N (11a)

d _2，1+d _2，2≤N (11b)

d _3，1+d _3，2≤N (11c)

Wherein, suppose that the antenna number of all receivers is equal, N is the reception antenna number of receiver.

When considering constraints (9a) to (9f), obtain

$\underset{i,j}{\mathrm{\Σ}}{d}_{j,i}\≤6M/5---\left(12\right)$

When considering constraints (10a) and (10b), obtain

$\underset{i,j}{\mathrm{\Σ}}{d}_{j,i}\≤2M---\left(13\right)$

When considering constraints (11a) to (11c), obtain

$\underset{i,j}{\mathrm{\Σ}}{d}_{j,i}\≤3N---\left(14\right)$

(12)～(14) are merged, release maximum obtainable DoF and be:

${\mathrm{\η}}^{*}=\max \left(\underset{i=1}{\overset{2}{\mathrm{\Σ}}}\underset{j=1}{\overset{3}{\mathrm{\Σ}}}{d}_{j,i}\right)=\min (2M,3N,6M/5)---\left(15\right)$

The situation of 3 above-mentioned receivers can be generalized to other situation, for example the situation of 4 receivers is identical with above-mentioned analysis, can release under the situation of 4 receivers:

η ^*＝min(2M，4N，8M/7) (16)

And under the situation of 2 receivers, maximum obtainable DoF is:

η ^*＝min(2M，2N，4M/3)(17)

Can obtain the problem of better DoF when existing the base station to serve what portable terminals simultaneously thus.By comparing (15) and (17), very clear, when transmitter is the base station, when receiver is portable terminal, have only under the following conditions, 3 portable terminals could obtain higher DoF than 2 portable terminals:

min(2M，3N，6M/5)＞min(2M，2N，4M/3)

Be equivalent to:

$6M/5>2N\⇒M>5N/3---\left(18\right)$

Similarly, relatively (15) and (16) can draw, and under the following conditions, 4 receivers can obtain than 3 DoF that portable terminal is higher:

$8M/7>3N\⇒M>21N/8---\left(19\right)$

At N=2, when 6 〉=M 〉=4,3 portable terminals are best, and when 8＞M 〉=6,4 portable terminals are best.

Should be noted that when transmitter is a portable terminal, when receiver was the base station, those skilled in the art also can derive best portable terminal number easily according to the above.For example, in this case, can think that also the DoF that is obtained according to formula (15) is at the obtainable maximum DoF of 2 portable terminals (transmitter).

Should be noted that when M=4 and N=3, maximum obtained DoF is 4.8, and attainable DoF (that is the number of independent data stream) must be an integer.This means and to round downwards DoF, promptly

Cause the loss of DoF.

And in yet another embodiment of the present invention, can use the sign extended technology to address this problem on the basis of the above.

At transmitter side, expanding element 350 carries out the T sign extended.Each transmitter i regards send symbol on T time slot or the subcarrier as the signal that sends from T virtual-antenna as, thereby it is carried out the associating precoding, will $d_i=\underset{j}{\mathrm{\Σ}}{d}_{j,i}$ Individual data are flowed through and are sent from T symbol after the precoding.Equally, a receiver is regarded the symbol that receives on T time slot or the subcarrier as receive from T virtual-antenna signal, thereby it is united reception.Like this, can be expressed as through the channel model after the expansion:

${\stackrel{\‾}{y}}_j\left(t\right)=\underset{i=1}{\overset{2}{\mathrm{\Σ}}}{\stackrel{\‾}{H}}_{j,i}\left(t\right){\stackrel{\‾}{x}}_i\left(t\right)+{\stackrel{\‾}{n}}_j\left(t\right)---\left(20\right)$

Wherein, x _i(t) be t the transmission signal vector on the extended channel, the dimension of this column vector is TM * 1, and it has comprised T the symbolic vector that dimension is M * 1 that sends, y on T time slot/subcarrier _j, H _{J, i}And n _jRepresent received signal vector, channel matrix and noise vector on the extended channel respectively.

In extended channel, the precoding unit 320 among the transmitter i uses dimension to be TM * d _iPre-coding matrix Q _i=[Q _{1, i}Q _{2, i}Q _{3, i}] with d _iIndividual independent data stream $\{s_i^{\left(k\right)},k=1~d_i\}$ Carry out precoding, form TM transmitting data stream, that is:

${\stackrel{\‾}{x}}_i\left(t\right)=\underset{k=1}{\overset{d_i}{\mathrm{\Σ}}}{s}_i^{\left(i\right)}\left(t\right)q_{i,k}=Q_i{s}_i\left(t\right)---\left(21\right)$

Wherein, each Q _{J, i}All be to adopt the method for similar (4)～(6) to produce s to extended channel _i ^(k)(t) be s _i ^(k)In t symbol, and $s_i\left(t\right)={[s_i^{\left(1\right)}\left(t\right)s_i^{\left(2\right)}\left(t\right)...s_i^{\left(d_i\right)}\left(t\right)]}^T,$ q _{I, k}Be Q _iK row, Q _iAll s have been comprised _i ^(k)(t) pairing precoding vector.After sign extended, it is extended T times to transmit and receive antenna.In order to obtain integer-valued DoF, according to (15), (16) and (17) at 2 receivers, are chosen as 3 multiple with T, are chosen as 5 multiple at 3 receivers, are chosen as 7 multiple at 4 receivers.The normalization DoF of every channel user is

Correspondingly, at receiver side, obtain signal phasor after codec unit 430 decodings of receiver $s_i\left(t\right)={[s_i^{\left(1\right)}\left(t\right)s_i^{\left(2\right)}\left(t\right)...s_i^{\left(d_i\right)}\left(t\right)]}^T,$ Extraction unit 440 is from s _i(t) recover the preceding signal of expansion in.

Mode with emulation illustrates the advantage of embodiments of the present invention at other technology below.In this emulation, use two transmitters and two receivers, each transmitter has two transmit antennas, and each receiver has two reception antennas.Each is independent identically distributed rayleigh fading channel to the channel between the transmitter and receiver, and has identical path loss.And shannon formula is used for calculated capacity.Show total capacity in the drawings to all receivers that are averaged in a large amount of channel realizations.

In Fig. 7, the scheme 1 expression technical scheme that embodiment of the present invention proposed wherein, is used the sign extended of T=3, and in 3 symbol periods, each transmitter sends 2 data flow to each receiver.

Scheme 2 expression Co-MIMO technical schemes are not used sign extended.Wherein, each transmitter sends 1 data flow to each receiver in a symbol period, and uses block diagonalization (block diagonalization) to avoid the interference between the user.

Scheme 3 is to disturb the sign extended of alignment techniques (interference alignment) in conjunction with T=3, and in three symbol periods, each transmitter sends 2 data flow to each receiver.

As can be seen from Fig. 7, scheme 1 all has advantage with respect to scheme 2 and scheme 3 in very wide SNR scope.

Those skilled in the art should be easy to recognize that as receiver, portable terminal is as the situation of transmitter at the base station, and its difference part only is that the channel independent of each other after the X signal decomposition is broadcast channel rather than MA channel.

Those skilled in the art should be easy to recognize, can realize the different step of said method by programmed computer.At this, some execution modes comprise equally machine readable or computer-readable program storage device (as, digital data storage medium) and the coding machine can carry out or the executable program command of computer, wherein, some or all steps of said method are carried out in this instruction.For example, program storage device can be digital storage, magnetic storage medium (as Disk and tape), hardware or the readable digital data storage medium of light.Execution mode comprises the programmed computer of the described step of carrying out said method equally.

Description and accompanying drawing only illustrate principle of the present invention.Therefore should be appreciated that those skilled in the art can advise different structures,, embodied principle of the present invention and be included within its spirit and scope though these different structures are not clearly described herein or illustrated.In addition, all examples of herein mentioning mainly only are used for teaching purpose clearly helping the design of reader understanding's principle of the present invention and promotion this area that the inventor was contributed, and should be interpreted as not being the restriction to these specific examples of mentioning and condition.In addition, all statement and specific examples thereof of mentioning principle of the present invention, aspect and execution mode comprise its equivalent interior herein.

Top description only is used to realize embodiments of the present invention; it should be appreciated by those skilled in the art; any modification that does not depart from the scope of the present invention or local the replacement; all should belong to claim of the present invention and come restricted portion; therefore, protection scope of the present invention should be as the criterion with the protection range of claims.

Claims (12)

1. transmission method is used for the X channel be made up of a plurality of receivers and a plurality of transmitter, and described method comprises:

Generation is at each pre-coding matrix in described a plurality of receivers;

According in the described pre-coding matrix corresponding one the signal phasor that will be sent to described a plurality of receivers carried out precoding;

Signal phasor after described a plurality of receivers send precoding.

Wherein said pre-coding matrix is to generate at the extended channel that T time slot or subcarrier are formed, the number of transmit antennas of described extended channel and reception antenna number be original channel T doubly;

Described according in the pre-coding matrix corresponding one the signal phasor that will be sent to described a plurality of receivers carried out precoding comprise:

According in the pre-coding matrix of described extended channel corresponding one signal phasor carried out precoding;

Described signal phasor after a plurality of receivers send precoding comprises:

At the signal phasor after a plurality of receivers send precoding on the described extended channel.

2. method according to claim 1 also comprises:

Select to obtain the portable terminal number of the maximum degree of freedom according to described a plurality of transmitters and described a plurality of receiver antenna number separately;

Described generation comprises at the pre-coding matrix of each in described a plurality of receivers:

Produce at each pre-coding matrix in described a plurality of receivers according to selected portable terminal number.

3. method according to claim 2 also comprises:

When described a plurality of transmitters are base stations, when described a plurality of receiver is portable terminal, reception is from the uplink detection signal of described a plurality of receivers, described uplink detection signal comprises the information at one filtering matrix corresponding in described a plurality of receivers, and described filtering matrix is by corresponding in a described a plurality of receivers signal phasor that is used for the described a plurality of transmitters of filtering to other receiver transmission;

According to described uplink detection signal estimation that receives and the channel information between each receiver, described channel information comprises the information of one filtering matrix corresponding in described a plurality of receiver,

Wherein, the described generation according to selected portable terminal number comprises at the pre-coding matrix of each in described a plurality of receivers:

Use the channel information of the filtering matrix information that comprises that described estimation obtains, described receiver is carried out precoding according to selected receiver number.

4. transmission method is used for the X channel be made up of a plurality of receivers and a plurality of transmitter, and described method comprises:

Reception is from the signal phasor of described a plurality of transmitters;

The signal phasor that other receiver in the signal phasor that filtering receives in described a plurality of receivers sends;

Signal phasor after the filtering is decoded, to recover in described a plurality of transmitters, to use the useful signal vector of pre-coding matrix precoding respectively;

Wherein said pre-coding matrix is to generate at the extended channel that T time slot or subcarrier are formed, the number of transmit antennas of described extended channel and reception antenna number be original channel T doubly; Described precoding be according in the pre-coding matrix of described extended channel corresponding one signal phasor carried out.

5. method according to claim 4, wherein, the described signal phasor that receives is to be merged by the acknowledge(ment) signal vector on a plurality of time slots or the subcarrier to form.

6. method according to claim 4 also comprises:

Generate filtering matrix, described filtering matrix is sent to described a plurality of transmitter, so that described a plurality of transmitter can carry out precoding to a plurality of receivers according to described filtering matrix;

The signal phasor that other receiver in the signal phasor that described filtering receives in described a plurality of receivers sends comprises:

Utilize the signal phasor that other receiver in described a plurality of receivers sends in the signal phasor that described filtering matrix filtering receives.

7. transmitter is used for the X channel be made up of a plurality of receivers and a plurality of transmitter, and described transmitter comprises:

The pre-coding matrix generation unit is used for a plurality of receivers are produced corresponding pre-coding matrix;

Precoding unit is used for according to corresponding one of described pre-coding matrix the signal phasor that will be sent to described a plurality of receivers being carried out precoding; And

First Transmit-Receive Unit is used to send the signal phasor after the precoding;

Wherein said pre-coding matrix is to generate at the extended channel that T time slot or subcarrier are formed, the number of transmit antennas of described extended channel and reception antenna number be original channel T doubly;

Wherein said precoding unit further is configured to be used for corresponding one of pre-coding matrix according to described extended channel signal phasor is carried out precoding;

Wherein said first Transmit-Receive Unit further is configured to be used at the signal phasor after a plurality of receivers send precoding on the described extended channel.

8. transmitter according to claim 7 also comprises:

Expanding element is used for the signal phasor after sending precoding on a plurality of time slots or the subcarrier.

9. transmitter according to claim 8 also comprises:

Selected cell is used for selecting to obtain according to described a plurality of transmitters and described a plurality of receiver antenna number separately the portable terminal number of the maximum degree of freedom;

Described pre-coding matrix generation unit is used for according to selected portable terminal number a plurality of receivers being produced corresponding pre-coding matrix.

10. receiver is used for the X channel be made up of a plurality of receivers and a plurality of transmitter, and described receiver comprises:

Second Transmit-Receive Unit is used to receive the signal phasor from described a plurality of transmitters;

Filter unit is used for the signal phasor that signal phasor other receiver in described a plurality of receivers that filtering receives sends; And

Codec unit is used for filtered signal phasor is decoded, to recover to use the useful signal vector of pre-coding matrix precoding respectively in described a plurality of transmitters;

Wherein said pre-coding matrix is to generate at the extended channel that T time slot or subcarrier are formed, the number of transmit antennas of described extended channel and reception antenna number be original channel T doubly; Wherein said precoding be according in the pre-coding matrix of described extended channel corresponding one signal phasor carried out.

11. receiver according to claim 10 also comprises:

The matrix generation unit is used to generate filtering matrix;

If described a plurality of receiver is a portable terminal, described second Transmit-Receive Unit also is used for the uplink detection signal of gripping altogether after the transposition precoding through described filtering matrix is sent to described a plurality of transmitter, so that described a plurality of transmitter can obtain to comprise the channel information of described filtering matrix, and utilize this channel information that a plurality of receivers are carried out precoding;

The signal phasor that signal phasor other receiver in described a plurality of receivers that described filter unit also is used for utilizing described filtering matrix filtering to receive sends.

12. a communication system comprises a plurality of according to any described transmitter in the claim 7 to 9 and a plurality of according to claim 10 or 11 described receivers.

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