CN103067064A - Determining method and determining device for pre-encoding vector - Google Patents

Abstract

The invention discloses a determining method and a determining device for a pre-encoding vector. The determining method comprises the steps that a terminal obtains a cooperating transmitting terminal which conducts combined processing with a service transmitting terminal of the terminal, and the terminal transmits first information channel state information of an information channel between the terminal and the cooperating transmitting terminal to the cooperating transmitting terminal, wherein the first information channel state information is used for enabling the cooperating transmitting terminal to determine the pre-encoding vector of data sent to a terminal which the cooperating transmitting terminal serves by the cooperating transmitting terminal. According to the determining method and the determining device for the pre-encoding vector, sending accuracy of cooperating wave bound-type data is improved.

Description

Definite method and the device of precoding vectors

Technical field

The present invention relates to the communications field, in particular to definite method and the device of precoding vectors.

Background technology

Along with the fast development of wireless communication technology, the frequency spectrum resource of wretched insufficiency becomes the principal element of restriction Development of Wireless Communications gradually, how to take full advantage of limited frequency spectrum resource, and improving the availability of frequency spectrum is the great difficult problem of radio communication.Multiple-input and multiple-output (Multiple-Input Multiple-Output is referred to as MIMO) technology can be in the situation that do not increase that bandwidth improves efficiency of transmission and the availability of frequency spectrum obtains extensive favor because of it.The MIMO technology has been utilized space diversity gain by transmitting and receiving diversity, has utilized antenna array gain by beam forming technique, has utilized the spatial reuse gain by space multiplexing technique.Particularly, obtain the weak dependence that diversity gain utilizes space channel, and the selectivity on binding time/frequency, transmit diversity provides more copy for the transmission of signal, receive diversity is to have received a plurality of copies in the space that transmit, and then improve the reliability of signal transmission, thereby improve the signal to noise ratio that receives signal, for example space-frequency block codes (Space Frequency Block Code); Obtain array gain and utilize the strong correlation of space channel, by little spacing aerial array is installed, thereby so that producing, the electromagnetic wave that transmits in the space interferes the antenna pattern that forms highly directive, so that the main lobe of antenna pattern points to arrival bearing user adaptively, thereby raising signal to noise ratio, improve power system capacity or coverage, for example single current beam forming (Single Stream Beamforming); Obtaining the spatial reuse gain also is the weak dependence that utilizes space channel, transmit different data flow at a plurality of separate space channels, thereby improve the peak rate of transfer of data, multiuser MIMO (Mutiple User MIMO for example, referred to as MU-MIMO) can on same resource block (Resource Block is referred to as RB), send data for a plurality of users simultaneously.

In Long Term Evolution (Long Term evolution is referred to as LTE) Release 8/9, defined public reference signal (Common Reference Signal is referred to as CRS).Subscriber equipment (User Equipment is referred to as UE) can carry out channel measurement by CRS, provides basic reference information for UE and Cell (enhanced Node Base station) select different MIMO transmission mode and scheduling of resource.LTE Release 8/9 supported transmission mode comprises diversity, open loop Single User MIMO (Single User MIMO is referred to as SU-MIMO), closed loop Single User MIMO and closed loop MU-MIMO.

In LTE Release 10, defined new reference signal channel information reference signal (Channel State Information-Reference Signal is referred to as CSI-RS) and be exclusively used in channel measurement.UE can measure and calculate pre-coding matrix index (Precoding Matrix Indicator to base station feedback by CSI-RS, referred to as PMI), channel quality information indication (Channel Quality Indicator, referred to as CQI) and order indication information such as (Rank Indicator are referred to as RI).CSI-RS provides possibility for further improving cell spectrum utilance, especially the cell edge availability of frequency spectrum, because CSI-RS is coordinate multipoint (Cooperative Multi-Point, referred to as CoMP) application of technology provides may, the CoMP technology makes the MIMO technology no longer be confined to single residential quarter, but but multi-plot joint is processed and coordination.Descending CoM P technology mainly comprises two kinds of forms:

Cooperative scheduling/cooperative beam figuration (Coordinated Scheduling/Coordinated Beamforming is referred to as CS/CB): data are only from the Serving cell emission, but UE scheduling or BF mode are jointly to be finished by cooperation point.

Unite emission (Joint Transmission is referred to as JT): data are by each cooperation point Combined Treatment, and namely the data of each UE are united emission by all cooperation points, to improve the quality of reception, eliminate and disturb.JT is made of a plurality of transmitting terminals and one or more receiving terminal.

At present, in the technology that current C S/CB realizes, leak based on letter that to make an uproar than (Signal to Leakage and Noise Ratio is referred to as SLNR) be typical CB technology, namely maximize desired signal power and the adjacent area is disturbed and the ratio of noise power.For example, as shown in Figure 1.

But there is a more serious problem in the CB technology that is based on SLNR, namely need adjacent end to the channel coefficients between the Serving cell (Cell) of the terminal that is scheduled, in real system because the problem such as feedback overhead, this to Channel Technology of adjacent base station be obtain unavailable, obtain at the most adjacent end to the pre-coding matrix index between the serving BS of the terminal that is scheduled, this has a strong impact on the CB technique effect based on SLNR.Particularly:

In the CB technology based on SLNR, Fig. 1 is the schematic diagram of combination treatment method of the cooperative beam figuration of correlation technique, as shown in Figure 1, relate to 2 terminals as example take CB, the service transmitting terminal of receiving terminal 1 is transmitting terminal 1, transmitting terminal 1 is wished the precoding vectors that uses when determining to receiving terminal 1 transmission data based on following formula when adopting the CB of SLNR:

$\arg \underset{W}{\max }\frac{{\left|\right|H_{11}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2}{{\left|\right|\underset{n\&NotEqual;1}{\overset{2}{\mathrm{\&Sigma;}}}{H}_{1n}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2+{\mathrm{\&sigma;}}^2}$ (formula 1)

Wherein, H _1nFor transmitting terminal 1 to the channel coefficient matrix between the receiving terminal n, obviously, optimum precoding vectors is under the SLNR criterion

Maximal eigenvector corresponding to eigenvalue of maximum, but receiving terminal 1 and 2 only can feed back optimum PMI, directly feedback channel coefficient matrix H.In the existing CB technology based on SLNR, all be directly to replace channel coefficient matrix H to determine optimum precoding vectors by code word corresponding to PMI, obtain following formula:

$\arg \underset{W}{\max }\frac{{\left|\right|W_{11}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2}{{\left|\right|\underset{n\&NotEqual;1}{\overset{2}{\mathrm{\&Sigma;}}}{W}_{1n}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2+{\mathrm{\&sigma;}}^2}$ (formula 2)

There is deviation in formula 1 with the optimal solution of formula 2, with rank (H _1n)=1 is as follows for the example concrete analysis:

Spectral factorization according to matrix:

${(H_{12}^H{H}_{12}+{\mathrm{\&sigma;}}^{2}I)}^{-1}\left(H_{11}^H{H}_{11}\right)={({\mathrm{\&lambda;}}_{12}{v}_{\mathrm{12,1}}{v}_{\mathrm{12,1}}^H+{\mathrm{\&sigma;}}^{2}I)}^{-1}\left({\mathrm{\&lambda;}}_{11}{v}_{\mathrm{11,1}}{v}_{\mathrm{11,1}}^H\right)={\mathrm{\&lambda;}}_{11}{\mathrm{\&lambda;}}_{12}{(v_{\mathrm{12,1}}{v}_{\mathrm{12,1}}^H+\frac{{\mathrm{\&sigma;}}^2}{{\mathrm{\&lambda;}}_{12}}I)}^{-1}\left(v_{\mathrm{11,1}}{v}_{\mathrm{11,1}}^H\right)$ (formula 3)

Wherein, v _1nFor

Eigenvalue of maximum λ _1nThe characteristic of correspondence vector, λ _1n≈ 1, n ≠ 1 o'clock, and it is feasible replacing complete channel information H with code word W corresponding to limited channel information PMI, code word W is v _1nQuantification.

Usually, the CB technology is mainly used in the receiving terminal at the edge that is in the transmitting terminal covering, in order to guarantee transmission quality, does not generally adopt the multithread transmission, so for rank (H _1n)＞1 o'clock only has when eigenvalue of maximum to approximate more greatly 1, and the further feature value replaces complete channel information H to be only with code word corresponding to limited channel information PMI approximate feasible when smaller.

For the poor lower problem of accuracy rate that causes cooperative beam figuration data to send of precoding vectors accuracy in the correlation technique, effective solution is proposed not yet at present.

Summary of the invention

For the poor lower problem of accuracy rate that causes cooperative beam figuration data to send of precoding vectors accuracy in the correlation technique, the invention provides a kind of definite method and device of precoding vectors, to address the above problem at least.

According to an aspect of the present invention, provide a kind of definite method of precoding vectors, having comprised: terminal is obtained the transmitting terminal that cooperates that carries out Combined Treatment with the service transmitting terminal of this terminal; Described terminal sends the first channel condition information of channel between this terminal and the described cooperation transmitting terminal to described cooperation transmitting terminal, wherein, described the first channel condition information is used for the precoding vectors that described cooperation transmitting terminal is determined the terminal transmission data that this cooperation transmitting terminal is served to this cooperation transmitting terminal.

Preferably, before described terminal sent the first channel condition information of channel between this terminal and the described cooperation transmitting terminal to described cooperation transmitting terminal, also comprise: described terminal was determined described the first channel condition information according to the information of described cooperation transmitting terminal.

Preferably, described terminal comprises to the first channel condition information that described cooperation transmitting terminal sends channel between this terminal and the described cooperation transmitting terminal: described terminal sends first channel condition information with the feedback system at the second interval to described cooperation transmitting terminal in the mode of the first interval feedback or at frequency domain in time domain.

Preferably, described and the service transmitting terminal of this terminal transmitting terminal that cooperates that carries out Combined Treatment refer to this terminal between channel fading and the service transmitting terminal of this terminal satisfy the transmitting terminal that cooperates of predetermined threshold to the ratio of the channel fading between this terminal.

Preferably, the information of described cooperation transmitting terminal comprise following one of at least: the Physical Cell Identifier of the pilot frequency locations information of described cooperation transmitting terminal, the pilot sequence information of described cooperation transmitting terminal, described cooperation transmitting terminal.

Preferably, described the first channel condition information comprise following one of at least: pre-coding matrix index; The characteristic value index of channel coefficient matrix; The singular value index of channel coefficient matrix; The modulation coding mode index; The order of space channel.

Preferably, described terminal comprises: portable terminal, macro base station, Home eNodeB or relay station.

According to another aspect of the invention, a kind of definite method of precoding vectors is provided, comprise: the cooperation transmitting terminal receives the second channel state information of the terminal transmission that the first channel condition information that terminal that transmitting terminal that the transmitting terminal that cooperate with this carries out Combined Treatment serves sends and this cooperation transmitting terminal serve, described the first channel condition information is the terminal of serving with the transmitting terminal that the described transmitting terminal that cooperates the carries out Combined Treatment channel condition information with the described channel between the transmitting terminal of cooperating, and described second channel state information is the described cooperation transmitting terminal terminal of serving and the channel condition information of the described channel between the transmitting terminal of cooperating; Described cooperation transmitting terminal uses described the first channel condition information and second channel state information to determine that this cooperation transmitting terminal sends the precoding vectors of data to the terminal of serving.

Preferably, the precoding vectors that the terminal that described cooperation transmitting terminal uses described the first channel condition information and second channel state information to determine that this cooperation transmitting terminal is served to this cooperation transmitting terminal sends data comprises: described cooperation transmitting terminal uses described the first channel condition information to determine the first channel information that this first channel condition information is corresponding, wherein, described the first channel information comprise following one of at least: the characteristic value of the first channel coefficient matrix, the first channel coefficient matrix, the first channel correlation matrix; Described cooperation transmitting terminal uses described second channel state information to determine the second channel information that this second channel state information is corresponding, wherein, described second channel information comprise following one of at least: second channel eigenvalues of the coefficient matrix, second channel coefficient matrix, second channel correlation matrix; Described cooperation transmitting terminal uses the first channel information and described second channel information to determine described precoding vectors.

Preferably, described cooperation transmitting terminal uses described the first channel information and described second channel information to determine that described precoding vectors comprises: described cooperation transmitting terminal is determined described precoding vectors by following formula:

$\arg \underset{W}{\max }\frac{{\left|\right|W_{\mathrm{ser}}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2}{{\left|\right|\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}_{\mathrm{co},i}^2{W}_{\mathrm{co},i}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2+{\mathrm{\&sigma;}}^2}$

W is described precoding vectors, W _SerBe described second channel coefficient matrix, W _{Co, i}Be i described the first channel coefficient matrix, λ _{Co, i}Be the characteristic value of described i the first channel coefficient matrix, σ ²Be noise power, the N representative sends the terminal number of the first channel condition information to the cooperation transmitting terminal, Two norms operation for compute matrix X.

According to a further aspect in the invention, provide a kind of definite device of precoding vectors, having comprised: acquisition module is used for obtaining the transmitting terminal that cooperates that carries out Combined Treatment with the service transmitting terminal of the terminal at this acquisition module place; Sending module, be used for sending to described cooperation transmitting terminal the first channel condition information of channel between this terminal and the described cooperation transmitting terminal, wherein, described the first channel condition information is used for the precoding vectors that described cooperation transmitting terminal is determined the terminal transmission data that this cooperation transmitting terminal is served to this cooperation transmitting terminal.

In accordance with a further aspect of the present invention, a kind of definite device of precoding vectors is provided, comprise: receiver module, be used for receiving the second channel state information of the first channel condition information of the terminal transmission of serving with the transmitting terminal that the described transmitting terminal that cooperates carries out Combined Treatment and the terminal transmission that this cooperation transmitting terminal is served, wherein, described the first channel condition information is described terminal and the channel condition information of the described channel between the transmitting terminal of cooperating, and described second channel state information is the described cooperation transmitting terminal terminal of serving and the channel condition information of the described channel between the transmitting terminal of cooperating; Determination module is used for using described the first channel condition information and second channel state information to determine that this cooperation transmitting terminal sends the precoding vectors of data to the terminal of serving.

By the present invention, terminal sends this terminal to the channel condition information of channel between this cooperation transmitting terminal to the cooperation transmitting terminal of this terminal, be used for the cooperation transmitting terminal and determine to send to the terminal that this cooperation transmitting terminal is served the precoding vectors of data, so that the cooperation transmitting terminal can obtain this transmitting terminal channel condition information to channel between this terminal that cooperates of the terminal transmission of serving with its transmitting terminal of uniting emission, and determine precoding vectors according to this channel condition information, improved the accuracy rate that cooperative beam figuration data send.

Description of drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, and illustrative examples of the present invention and explanation thereof are used for explaining the present invention, do not consist of improper restriction of the present invention.In the accompanying drawings:

Fig. 1 is the schematic diagram of combination treatment method of the cooperative beam figuration of correlation technique;

Fig. 2 is the first pass figure according to definite method of the precoding vectors of the embodiment of the invention;

Fig. 3 is the second flow chart according to definite method of the precoding vectors of the embodiment of the invention;

Fig. 4 is the first structured flowchart according to definite device of the precoding vectors of the embodiment of the invention;

Fig. 5 is the second structured flowchart according to definite device of the precoding vectors of the embodiment of the invention;

Fig. 6 is the schematic diagram according to the feedback of the cooperative beam figuration of the embodiment of the invention;

Fig. 7 is the channel feedback schematic diagram one according to the receiving terminal of the cooperative beam figuration of the embodiment of the invention;

Fig. 8 is the channel feedback schematic diagram two according to the receiving terminal of the cooperative beam figuration of the embodiment of the invention;

Fig. 9 is the sequential schematic diagram one according to the periodic feedback of the receiving terminal of the embodiment of the invention:

Figure 10 is the sequential schematic diagram two according to the periodic feedback of the receiving terminal of the embodiment of the invention; And

Figure 11 is the sequential schematic diagram three according to the periodic feedback of the receiving terminal of the embodiment of the invention.

Embodiment

Hereinafter also describe in conjunction with the embodiments the present invention in detail with reference to accompanying drawing.Need to prove, in the situation that do not conflict, embodiment and the feature among the embodiment among the application can make up mutually.

The present embodiment provides a kind of definite method of precoding vectors, and Fig. 2 is the first pass figure according to definite method of the precoding vectors of the embodiment of the invention, comprises that following step S202 is to step S204.

Step S202: terminal is obtained the transmitting terminal that cooperates that carries out Combined Treatment with the service transmitting terminal of this terminal.

Step S204: terminal sends the first channel condition information of channel between this terminal and this cooperation transmitting terminal to this cooperation transmitting terminal, wherein, the first channel condition information is used for the precoding vectors that this cooperation transmitting terminal is determined the terminal transmission data that this cooperation transmitting terminal is served to this cooperation transmitting terminal.

Pass through above-mentioned steps, terminal sends this terminal to the channel condition information of channel between this cooperation transmitting terminal to the cooperation transmitting terminal of this terminal, be used for the cooperation transmitting terminal and determine to send to the terminal that this cooperation transmitting terminal is served the precoding vectors of data, so that the cooperation transmitting terminal can obtain this transmitting terminal channel condition information to channel between this terminal that cooperates of the terminal transmission of serving with its transmitting terminal of uniting emission, and determine precoding vectors according to this channel condition information, improved the accuracy rate that cooperative beam figuration data send.

As one preferred embodiment, before step S204, terminal can be obtained the first channel condition information in several ways, for example, can terminal self determine this first channel condition information, also can obtain the first channel condition information that this cooperation transmitting terminal is determined by the cooperation transmitting terminal.More excellent, can determine this first channel condition information according to the information of cooperation transmitting terminal.When implementing, the information of this cooperation transmitting terminal can comprise following one of at least: the pilot sequence information of the pilot frequency locations information of cooperation transmitting terminal, cooperation transmitting terminal, the Physical Cell Identifier of the transmitting terminal that cooperates.In the preferred embodiment, terminal is determined the first channel condition information according to the information of cooperation transmitting terminal, can save the load of signaling, determine the first channel condition information by the pilot frequency locations information of cooperation transmitting terminal, the pilot sequence information of cooperation transmitting terminal, the Physical Cell Identifier of cooperation transmitting terminal simultaneously, improved the accuracy of this first channel condition information.

When implementing, terminal can select a plurality of cooperation emissions to bring in the emission that cooperates, and is just passable as long as terminal can receive the signal of cooperation transmit diversity, but, in the operation of practical communication system, cooperation transmitting terminal quantity is too much, causes this computational process more complicated.More excellent, the decline of determining to arrive in all cooperation transmitting terminals of this terminal this terminal and this service transmitting terminal to the ratio of the decline of this terminal satisfies the transmitting terminal of predetermined threshold as the transmitting terminal that cooperates.Like this, terminal select signal

As one preferred embodiment, terminal among the step S204 can be periodically or aperiodicity ground feed back at frequency domain or time domain, for feedback system periodically, terminal can send first channel quality with the feedback system at the second interval sends feedback system from the first channel condition information to the cooperation transmitting terminal to the cooperation transmitting terminal in the mode of the first interval feedback or at frequency domain in time domain.Like this, can send demand according to system and adopt flexibly feedback system, can improve the flexibility of feedback system, can reduce the signaling traffic load of terminal feedback the first channel quality simultaneously.

As a more excellent execution mode, it is one of following that the first channel condition information comprises: pre-coding matrix index; The characteristic value index of channel coefficient matrix; The singular value index of channel coefficient matrix; Modulation coding mode; The order of space channel.This execution mode has been set terminal and the content that the channel condition information of channel comprises between the transmitting terminal that cooperates, and different channel condition informations can be set as required, has improved the flexibility of feeding back the first channel condition information.

As another more excellent execution mode, terminal comprises: portable terminal, macro base station, Home eNodeB or relay station.The type that this execution mode defines terminal not only comprises portable terminal, also comprises and macro base station, Home eNodeB and relay station have improved the applicable scope of the method.

The present embodiment provides a kind of definite method of precoding vectors, and Fig. 3 is the second flow chart according to definite method of the precoding vectors of the embodiment of the invention, and as shown in Figure 3, the method comprises the steps that S302 is to step S304.

Step S302: the cooperation transmitting terminal receives the second channel state information of the terminal transmission that the first channel condition information that terminal that transmitting terminal that the transmitting terminal that cooperate with this carries out Combined Treatment serves sends and this cooperation transmitting terminal serve, the first channel condition information carries out the channel condition information of terminal that the transmitting terminal of Combined Treatment serves and the channel between the transmitting terminal of cooperating for the transmitting terminal that cooperate with this, the second channel state information is the channel condition information of terminal that transmitting terminal serves and the channel between the transmitting terminal of cooperating of cooperating.

Step S304: the cooperation transmitting terminal uses the first channel condition information and second channel state information to determine that this cooperation transmitting terminal sends the precoding vectors of data to the terminal of serving.

Pass through above-mentioned steps, the cooperation transmitting terminal receives cooperate with this second channel state information of the terminal feedback that the first channel condition information that transmitting terminal carries out the terminal transmission that transmitting terminal that JT launches serves and this cooperation transmitting terminal serve of this cooperation transmitting terminal, then determine to send to the terminal that this cooperation transmitting terminal is served the precoding vectors of data, improved the accuracy rate that cooperative beam figuration data send.

As a more excellent execution mode, step S302 can be in the following way: the cooperation transmitting terminal uses the first channel condition information to determine the channel information that this first channel condition information is corresponding; The cooperation transmitting terminal uses the second state quality information to determine the channel information that this second channel state information is corresponding; Wherein, the first channel information comprise following one of at least: the first channel coefficients base station, the first channel correlation matrix, the first channel covariance matrices; Second channel information comprise following one of at least: second channel coefficient base station, second channel correlation matrix, second channel covariance matrix; The cooperation transmitting terminal uses the first channel information and second channel information to determine precoding vectors.This embodiment at first determines to comprise the channel information of the information such as channel correlation matrix, then uses channel information to determine precoding vectors, has improved the accuracy of precoding vectors.More excellent, can use following mode to determine precoding vectors:

W is precoding vectors, W _SerBe second channel coefficient matrix, W _{Co, i}Be i the first channel coefficient matrix, λ _{Co, i}Be the characteristic value of i the first channel coefficient matrix, σ ²Be noise power, the N representative sends the terminal number of the first channel condition information to the cooperation transmitting terminal, Two norms operation for compute matrix X.

As another more excellent execution mode, the cooperation transmitting terminal comprises: portable terminal, macro base station, Home eNodeB or relay station.The type that this execution mode defines the cooperation transmitting terminal not only comprises portable terminal, also comprises macro base station, Home eNodeB and relay station, has improved the applicable scope of the method.

Need to prove, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.

As another more excellent execution mode, the cooperation transmitting terminal comprises: portable terminal, macro base station, Home eNodeB or relay station.The type that this execution mode defines the cooperation transmitting terminal not only comprises portable terminal, also comprises macro base station, Home eNodeB and relay station, has improved the applicable scope of the method.

In another embodiment, also provide a kind of definite software of precoding vectors, this software be used for to be carried out the technical scheme that above-described embodiment and preferred embodiment are described.

In another embodiment, also provide a kind of storage medium, stored above-mentioned data transmission software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.

The embodiment of the invention also provides a kind of definite device of precoding vectors, definite device of this precoding vectors can be used for realizing definite method and the preferred implementation of above-mentioned precoding vectors, carried out explanation, repeat no more, the module that relates in definite device of the below to this precoding vectors describes.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described system and method for following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also may and be conceived.

Fig. 4 is the first structured flowchart according to definite device of the precoding vectors of the embodiment of the invention, and this device can be applied to terminal, and as shown in Figure 4, this device comprises: acquisition module 42 and sending module 44, the below is elaborated to said structure.

Acquisition module 42 is used for obtaining the transmitting terminal that cooperates that carries out Combined Treatment with the service transmitting terminal of the terminal at this acquisition module place; Sending module 44, be connected to acquisition module 42, be used for to the first channel condition information that obtains the 42 cooperation transmitting terminals that get access to and send channel between this terminal and the cooperation transmitting terminal, wherein, the first channel condition information is used for the precoding vectors that the cooperation transmitting terminal is determined the terminal transmission data that this cooperation transmitting terminal is served to this cooperation transmitting terminal.

In another embodiment, also provide a kind of definite software of precoding vectors, this software be used for to be carried out the technical scheme that above-described embodiment and preferred embodiment are described.

In another embodiment, also provide a kind of storage medium, stored above-mentioned data transmission software in this storage medium, this storage medium includes but not limited to: CD, floppy disk, hard disk, scratch pad memory etc.

The embodiment of the invention also provides a kind of definite device of precoding vectors, definite device of this precoding vectors can be used for realizing definite method and the preferred implementation of above-mentioned precoding vectors, carried out explanation, repeat no more, the module that relates in definite device of the below to this precoding vectors describes.As used below, the combination of software and/or the hardware of predetermined function can be realized in term " module ".Although the described system and method for following examples is preferably realized with software, hardware, perhaps the realization of the combination of software and hardware also may and be conceived.

Fig. 5 is the second structured flowchart according to definite device of the precoding vectors of the embodiment of the invention, and this device can be applied to the transmitting terminal that cooperates, and as shown in Figure 5, this device comprises: receiver module 52 and determination module 54, and the below is described in detail said structure:

Receiver module 52, be used for to receive the second channel state information of carrying out the terminal transmission that the first channel condition information that terminal that the transmitting terminal of Combined Treatment serves sends and this cooperation transmitting terminal serve with the transmitting terminal that cooperate, wherein, the first channel condition information is terminal and the channel condition information of the channel between the transmitting terminal of cooperating, the channel condition information of the terminal that the second channel state information is served for the cooperation transmitting terminal and the channel between the transmitting terminal of cooperating; The second determination module 54 is connected to receiver module 52, the precoding vectors that be used for to use the first channel condition information that receiver module 52 receives and second channel state information to determine the terminal transmission data that this cooperation transmitting terminal is served.

Describe below in conjunction with preferred embodiment, following preferred embodiment combines above-described embodiment and preferred implementation.

Preferred embodiment one

The present embodiment provides channel feedback and the precoding coordination approach in a kind of cooperative beam figuration technology, and the method in the present embodiment comprises the steps:

Step S1: receiving terminal to its cooperation transmitting terminal with the channel condition information on the feedback system feedback resource block of interval.

Step S2: the cooperation transmitting terminal is determined the cooperative beam vector according to the channel condition information of feedback.

When implementing, receiving terminal can select a plurality of cooperation emissions to bring in the emission that cooperates, and is just passable as long as receiving terminal can receive the signal of cooperation transmit diversity, but, in the operation of practical communication system, cooperation transmitting terminal quantity is too much, causes the computational process more complicated of receiving terminal.More excellent, can screen all cooperation transmitting terminals of this receiving terminal according to pre-defined rule, for example: can select except the service transmitting terminal of this receiving terminal, the decline that arrives this receiving terminal and this service transmitting terminal satisfy the transmitting terminal that cooperates of predetermined threshold to the ratio of the decline of this receiving terminal.

As a more excellent execution mode, channel condition information comprises at least: order, optimum pre-coding matrix index, the characteristic value index of channel coefficient matrix, the modulation coding mode of the space channel between receiving terminal and the transmitting terminal (comprising cooperate transmitting terminal and service transmitting terminal).

As another more excellent execution mode, the interval feedback system can adopt following dual mode to feed back:

Mode one: transmitting terminal on time domain interval to cooperation transmitting terminal feeding back channel state information.More excellent, this time interval is the time interval of different lengths, for example: a plurality of subframes or a plurality of frame.In mode one, transmitting terminal at the interval a plurality of subframes or a plurality of frame can send out feedback different channels state information to the cooperation transmitting terminal.

Mode two: transmitting terminal on frequency domain interval to cooperation transmitting terminal feeding back channel state information.

Preferably, the feedback system of mode one and mode two all can be cycle or aperiodic mode.Mode for the cycle refers to interval fixedly subframe or frame number feeding back channel state information; For aperiodic mode refer to interval on-fixed subframe or frame number feeding back channel state information.When implementing, for aperiodic mode can trigger in several ways, for example: can trigger by transmitting terminal.Feedback system adopt the cycle or aperiodic mode can determine in several ways: for example: can or can indicate by the message that is sent to receiving terminal by transmitting terminal by the system default setting.

Step S2 comprises: the cooperation transmitting terminal is determined precoding vectors and/or the precoding vectors index that the cooperation transmitting terminal uses according to the channel condition information of receiving terminal feedback.

Preferably, the cooperation transmitting terminal recovers channel information between cooperation transmitting terminal and the receiving terminal according to the channel condition information of the receiving terminal feedback transmitting terminal that refers to cooperate according to the channel condition information of receiving terminal feedback, comprise the channel coefficients coefficient matrix, correlation matrix, covariance matrix.

In the present embodiment, by receiving terminal to its cooperation transmitting terminal with the channel condition information on the feedback system feedback resource block of interval, the cooperation transmitting terminal is determined the cooperative beam vector according to the channel condition information of feedback, when realizing the down collaboration multiple spot, promotes the receptivity of coordinate multipoint.

Preferred embodiment two

The present embodiment provides a kind of precoding vectors generation method, Fig. 7 is the channel feedback schematic diagram one according to the receiving terminal of the cooperative beam figuration of the embodiment of the invention, as shown in Figure 7, receiving terminal in the present embodiment comprises receiving terminal 1 and receiving terminal 2, for receiving terminal 1, its service transmitting terminal is transmitting terminal 1, and its cooperation transmitting terminal is transmitting terminal 2, and transmitting terminal 1 sends data to receiving terminal 1; For receiving terminal 2, its service transmitting terminal is transmitting terminal 2, and its cooperation transmitting terminal is transmitting terminal 1, and transmitting terminal 2 sends data to receiving terminal 2.

Feedback method in the present embodiment comprises:

For receiving terminal 1, except to transmitting terminal 1 feeding back channel state information, need to be to its transmitting terminal that cooperates, i.e. transmitting terminal 2 feeding back channel state informations.

For receiving terminal 2, except to transmitting terminal 2 feeding back channel state informations, need to be to its transmitting terminal that cooperates, i.e. transmitting terminal 1 feeding back channel state information.

Precoding vectors in the present embodiment generates can be in the following way:

For receiving terminal 1, transmitting terminal 1 has been dispatched the Resource Block A that belongs to transmitting terminal 1 for it, when transmitting terminal 2 has also distributed the Resource Block A that belongs to transmitting terminal 2 for receiving terminal 2, at this moment, transmitting terminal 1 can determine that new precoding vectors is used for sending data to receiving terminal 1 according to channel condition information, according to channel condition information except receiving terminal 1 to the channel condition information of transmitting terminal 1 feedback, comprise that also receiving terminal 2 is to the channel condition information of transmitting terminal 1 feedback.

Fig. 8 is the channel feedback schematic diagram two according to the receiving terminal of the cooperative beam figuration of the embodiment of the invention, and as shown in Figure 8, the receiving terminal in the present embodiment comprises receiving terminal 2 and receiving terminal 1:

For receiving terminal 2, transmitting terminal 2 has been dispatched the Resource Block B that belongs to transmitting terminal 2 for it, when transmitting terminal 2 has also distributed the Resource Block B that belongs to transmitting terminal 1 for receiving terminal 1, at this moment, transmitting terminal 2 can determine that new precoding vectors is used for sending data to receiving terminal 2 according to channel condition information, according to channel condition information except receiving terminal 2 to the channel condition information of transmitting terminal 2 feedback, comprise that also receiving terminal 1 is to the channel condition information of transmitting terminal 2 feedbacks.

Need to prove, be 1 with the cooperation transmitting terminal number of receiving terminal in the present embodiment and carry out the example explanation, and cooperation transmitting terminal number can be selected according to the signal strength signal intensity of cooperation transmitting terminal, is not limited to 1.

Preferred embodiment three

The present embodiment provides a kind of precoding vectors generation method, receiving terminal in the present embodiment is identical with above preferred embodiment two with the cooperation transmitting terminal, the present embodiment adopts periodic feedback, Fig. 9 is the sequential schematic diagram one according to the periodic feedback of the receiving terminal of the embodiment of the invention, as shown in Figure 9, in the present embodiment

Transmitting terminal 1 determines the precoding vectors of the receiving terminal of transmitting terminal 1 service by the periodic feedback channel condition information of receiving terminal;

Transmitting terminal 2 determines the precoding vectors of the receiving terminal of transmitting terminal 2 services by the periodic feedback channel condition information of receiving terminal.

For receiving terminal 1, its service transmitting terminal is transmitting terminal 1, and its cooperation transmitting terminal is transmitting terminal 2, and transmitting terminal 1 sends data to receiving terminal 1;

For receiving terminal 2, its service transmitting terminal is transmitting terminal 2, and its cooperation transmitting terminal is transmitting terminal 1, and transmitting terminal 2 sends data to receiving terminal 2.

Receiving terminal 1 comprises the RI of channel, PMI, and MCS to its service transmitting terminal 1 periodic feedback channel condition information.

Receiving terminal 2 comprises the RI of channel, PMI, channel matrix characteristic value and MCS to its service transmitting terminal 1 periodic feedback channel condition information.

Transmitting terminal 1 obtains transmitting terminal 1 to the channel matrix relevant information of receiving terminal and 2 according to the channel condition information of receiving terminal 1 and 2 feedbacks.

For example:

Receiving terminal 1 has fed back PMI11 to transmitting terminal 1, and its corresponding precoding vectors is W11.

Receiving terminal 2 has fed back PMI12 to transmitting terminal 1, and its corresponding precoding vectors is W12.

In addition, receiving terminal 2 has also fed back the eigenvalue of maximum index E12 of channel coefficient matrix H12 to transmitting terminal 1, and its corresponding eigenvalue of maximum is λ ₁₂

Then: H ₁₁≈ W ₁₁

H ₁₂≈ λ ₁₂W ₁₂(formula 4)

Receiving terminal 1 is estimated the channel coefficients correlation matrix as follows

With

$H_{11}^H{H}_{11}\&ap;W_{11}^H{W}_{11}$

$H_{12}^H{H}_{12}\&ap;{\mathrm{\&lambda;}}_{12}^2{W}_{12}^H{W}_{12}$ (formula 5)

The precoding vectors that receiving terminal 1 uses when determining as follows to receiving terminal 1 transmission data:

$\arg \underset{W}{\max }\frac{{\left|\right|W_{11}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2}{{\left|\right|{\mathrm{\&lambda;}}_{12}^2{W}_{12}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2+{\mathrm{\&sigma;}}^2}$ (formula 6)

The method of the precoding vectors that uses when determining to receiving terminal 1 transmission data with receiving terminal 1 is similar, the precoding vectors that transmitting terminal 2 uses when determining to receiving terminal 2 transmission data according to following formula:

$\arg \underset{W}{\max }\frac{{\left|\right|W_{12}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2}{{\left|\right|{\mathrm{\&lambda;}}_{11}^2{W}_{11}W\left|\right|}_{\mathrm{<figure-callout\; id="2"\; label="F"\; filenames="HDA0000101064170000031.png"\; state="\{\{state\}\}">F</figure-callout>}}^2+{\mathrm{\&sigma;}}^2}$ (formula 7)

Preferred embodiment four

The present embodiment provides a kind of precoding vectors generation method, receiving terminal in the present embodiment is identical with above preferred embodiment two with the cooperation transmitting terminal, the present embodiment adopts non-periodic feedback, Figure 11 is the sequential schematic diagram three according to the periodic feedback of the receiving terminal of the embodiment of the invention, as shown in figure 11, the RI/PMI/MCS in the present embodiment and characteristic value can be carried out non-periodic feedback.

Need to prove, the transmitting terminal among the application can be the equipment such as base station, Home eNodeB, relay station, also can be communication terminal, notebook computer, Hand Personal Computer etc.Similarly, receiving terminal is used for the data-signal of receiving end/sending end, and receiving terminal can be the terminal equipments such as mobile phone, notebook computer, Hand Personal Computer, also can be the base station, the control appliances such as relay station.

Pass through above-described embodiment, a kind of definite method and device of precoding vectors are provided, receive cooperate with this second channel state information of the terminal feedback that the first channel condition information that transmitting terminal carries out the terminal transmission that transmitting terminal that JT launches serves and this cooperation transmitting terminal serve of this cooperation transmitting terminal by the cooperation transmitting terminal, then determine to send to the terminal that this cooperation transmitting terminal is served the precoding vectors of data, improved the accuracy rate that cooperative beam figuration data send.Need to prove, these technique effects are not that above-mentioned all execution modes have, and some technique effect is that some preferred implementation just can obtain.

Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, carried out by calculation element thereby they can be stored in the storage device, perhaps they are made into respectively each integrated circuit modules, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.

The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (13)

1. definite method of a precoding vectors is characterized in that, comprising:

Terminal is obtained the transmitting terminal that cooperates that carries out Combined Treatment with the service transmitting terminal of this terminal;

Described terminal sends the first channel condition information of channel between this terminal and the described cooperation transmitting terminal to described cooperation transmitting terminal, wherein, described the first channel condition information is used for the precoding vectors that described cooperation transmitting terminal is determined the terminal transmission data that this cooperation transmitting terminal is served to this cooperation transmitting terminal.

2. described method according to claim 1, it is characterized in that, before described terminal sent the first channel condition information of channel between this terminal and the described cooperation transmitting terminal to described cooperation transmitting terminal, also comprise: described terminal was determined described the first channel condition information according to the information of described cooperation transmitting terminal.

3. method according to claim 1 is characterized in that, described terminal comprises to the first channel condition information that described cooperation transmitting terminal sends channel between this terminal and the described cooperation transmitting terminal:

Described terminal sends first channel condition information with the feedback system at the second interval to described cooperation transmitting terminal in the mode of the first interval feedback or at frequency domain in time domain.

4. each described method in 3 according to claim 1, it is characterized in that, the transmitting terminal that cooperates that described and the service transmitting terminal of this terminal carry out Combined Treatment refer to this terminal between channel fading and the service transmitting terminal of this terminal satisfy the transmitting terminal that cooperates of predetermined threshold to the ratio of the channel fading between this terminal.

5. each described method in 3 according to claim 1, it is characterized in that, the information of described cooperation transmitting terminal comprise following one of at least: the Physical Cell Identifier of the pilot frequency locations information of described cooperation transmitting terminal, the pilot sequence information of described cooperation transmitting terminal, described cooperation transmitting terminal.

6. each described method in 3 according to claim 1 is characterized in that, described the first channel condition information comprise following one of at least:

Pre-coding matrix index;

The characteristic value index of channel coefficient matrix;

The singular value index of channel coefficient matrix;

The modulation coding mode index;

The order of space channel.

7. each described method in 3 according to claim 1 is characterized in that, described terminal comprises: portable terminal, macro base station, Home eNodeB or relay station.

8. definite method of a precoding vectors is characterized in that, comprising:

The cooperation transmitting terminal receives the second channel state information of the terminal transmission that the first channel condition information that terminal that transmitting terminal that the transmitting terminal that cooperate with this carries out Combined Treatment serves sends and this cooperation transmitting terminal serve, described the first channel condition information is the terminal of serving with the transmitting terminal that the described transmitting terminal that cooperates the carries out Combined Treatment channel condition information with the described channel between the transmitting terminal of cooperating, and described second channel state information is the described cooperation transmitting terminal terminal of serving and the channel condition information of the described channel between the transmitting terminal of cooperating;

Described cooperation transmitting terminal uses described the first channel condition information and second channel state information to determine that this cooperation transmitting terminal sends the precoding vectors of data to the terminal of serving.

9. method according to claim 8, it is characterized in that, the precoding vectors that the terminal that described cooperation transmitting terminal uses described the first channel condition information and second channel state information to determine that this cooperation transmitting terminal is served to this cooperation transmitting terminal sends data comprises:

Described cooperation transmitting terminal uses described the first channel condition information to determine the first channel information that this first channel condition information is corresponding, wherein, described the first channel information comprise following one of at least: the characteristic value of the first channel coefficient matrix, the first channel coefficient matrix, the first channel correlation matrix;

Described cooperation transmitting terminal uses described second channel state information to determine the second channel information that this second channel state information is corresponding, wherein, described second channel information comprise following one of at least: second channel eigenvalues of the coefficient matrix, second channel coefficient matrix, second channel correlation matrix;

Described cooperation transmitting terminal uses the first channel information and described second channel information to determine described precoding vectors.

10. method according to claim 9 is characterized in that, described cooperation transmitting terminal uses described the first channel information and described second channel information to determine that described precoding vectors comprises:

Described cooperation transmitting terminal is determined described precoding vectors by following formula:

$\arg \underset{W}{\max }\frac{{\left|\right|W_{\mathrm{ser}}W\left|\right|}_F^2}{{\left|\right|\underset{i=1}{\overset{N}{\mathrm{\&Sigma;}}}{\mathrm{\&lambda;}}_{\mathrm{co},i}^2{W}_{\mathrm{co},i}W\left|\right|}_F^2+{\mathrm{\&sigma;}}^2}$

W is described precoding vectors, W _SerBe described second channel coefficient matrix, W _{Co, i}Be i described the first channel coefficient matrix, λ _{Co, i}Be the characteristic value of described i the first channel coefficient matrix, σ ²Be noise power, the N representative sends the terminal number of the first channel condition information to the cooperation transmitting terminal, Two norms operation for compute matrix X.

11. each described method in 10 is characterized in that according to claim 8, described cooperation transmitting terminal comprises: portable terminal, macro base station, Home eNodeB or relay station.

12. definite device of a precoding vectors is applied to terminal, it is characterized in that, comprising:

Acquisition module is used for obtaining the transmitting terminal that cooperates that carries out Combined Treatment with the service transmitting terminal of the terminal at this acquisition module place;

Sending module, be used for sending to described cooperation transmitting terminal the first channel condition information of channel between this terminal and the described cooperation transmitting terminal, wherein, described the first channel condition information is used for the precoding vectors that described cooperation transmitting terminal is determined the terminal transmission data that this cooperation transmitting terminal is served to this cooperation transmitting terminal.

13. definite device of a precoding vectors is applied to the transmitting terminal that cooperates, and it is characterized in that, comprising:

Receiver module, be used for receiving the second channel state information of the first channel condition information of the terminal transmission of serving with the transmitting terminal that the described transmitting terminal that cooperates carries out Combined Treatment and the terminal transmission that this cooperation transmitting terminal is served, wherein, described the first channel condition information is described terminal and the channel condition information of the described channel between the transmitting terminal of cooperating, and described second channel state information is the described cooperation transmitting terminal terminal of serving and the channel condition information of the described channel between the transmitting terminal of cooperating;

Determination module is used for using described the first channel condition information and second channel state information to determine that this cooperation transmitting terminal sends the precoding vectors of data to the terminal of serving.

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