CN107342799A - A kind of 3DMU MIMO pre-coding matrixes building method and device - Google Patents

A kind of 3DMU MIMO pre-coding matrixes building method and device Download PDF

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Publication number
CN107342799A
CN107342799A CN201710748275.7A CN201710748275A CN107342799A CN 107342799 A CN107342799 A CN 107342799A CN 201710748275 A CN201710748275 A CN 201710748275A CN 107342799 A CN107342799 A CN 107342799A
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mrow
msub
matrix
coding matrix
mimo
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杜凯铭
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Nanjing Kexing New Mstar Technology Ltd
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Nanjing Kexing New Mstar Technology Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Abstract

The present invention relates to wireless communication technology field, more particularly to a kind of 3D MU MIMO pre-coding matrixes building methods and device.Wherein, the 3D MU MIMO pre-coding matrix building methods, including：It is the first codebook matrix W for representing broadband or long-term channel characteristics to construct pre-coding matrix W1The second code book matrix W with representing arrowband or short-term channel behaviors2Product, first codebook matrix is：

Description

A kind of 3DMU-MIMO pre-coding matrixes building method and device
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of 3D MU-MIMO pre-coding matrixes building method and Device.
Background technology
The multiple antenna communication of multiple-input and multiple-output (Multiple-Input Multiple-Output, MIMO) can Support parallel data flow to send, therefore the handling capacity of system can be greatly increased, have become academic research and real system In enjoy technology of concern.In normal circumstances, the data streams in parallel in multi-antenna transmission carry out first it is independent before Encode to error correcting code, then the code word after coding is mapped in one or more transport layer.When code word is mapped as multiple biographies During defeated layer, it is corresponding multilayer that the serial data of encoder output is carried out into serial to parallel conversion.In once transmitting, system branch All transmission numbers of plies held are also known as the rank number of this transmission.
The implementation of MIMO technology will depend on the utilization for channel condition information (CSI), in order to by entering in transmitting terminal Row precoding improves system transmission performance, and transmitting terminal needs to know channel condition information (Channel Statement Information, CSI), and channel condition information CSI carries out channel estimation using reference sequences generally by receiving terminal and obtained, This usually requires receiving terminal channel condition information CSI and is fed back to transmitting terminal, is suitably prelisted for being calculated in transmitting terminal Code or beam forming parameter.However, the finiteness of CSI feedback channel determines that the design of precoding codebook is necessary.For Reduction feedback quantity, a kind of dicode this W=W by forming for two layers is proposed in situation on high order and low-rank1*W2Prelist Code method, W1With W2It is long-term pre-coding matrix (that is, the precoding square calculated using the long-time statistical of channel condition information respectively Battle array) and short-term pre-coding matrix (that is, the pre-coding matrix calculated using the short term statistics of channel condition information).
Although the pre-coding scheme based on dicode sheet is proposed in the prior art, for example existing LTE R8 systems are bases It is main in 4 antenna codebooks and 8 antenna codebooks of the LTE R10 systems based on dicode the design of mirror transformation Householder designs Level to be directed to Antenna Design, does not account for vertically being filled in the free degree of space resources to the free degree of antenna Divide and utilize, be especially not efficiently used in the space resources of perpendicular domains, thus in multiple user distributions in same building thing Different floors in the case of, these schemes be difficult to support multi-user transmission, be directly used in AAS antenna for base station deployment when, system Performance is by degradation.
The content of the invention
The present invention in view of the shortcomings of the prior art, proposes a kind of 3D MU-MIMO pre-coding matrixes building method and device, Applied in 4G LTE, LTE-A and 5G IMT-2020 GSMs eMBB, using including support vertical direction with it is horizontal The pre-coding matrix that direction quantifies, the free degree of active antenna system vertical direction can be made full use of, so as to improve CSI feedback Precision and throughput of system.
In a first aspect, the present invention proposes a kind of 3D MU-MIMO pre-coding matrix building methods, including：
Reference signal is sent to receiving device；
Receive the pre-coding matrix instruction PMI that the receiving device is sent；
Determine that the receiving device is based on reference signal and constructs the pre-coding matrix W according to the PMI；
The pre-coding matrix W is the first codebook matrix W for representing broadband or long-term channel characteristics1With representing arrowband or short Second code book matrix W of the phase characteristic of channel2Product, first codebook matrix is：
Wherein, RCLA,H、RCLA,V、RULA,H、RULA,VIt is diagonal matrix, matrix DCLA,H、DCLA,V、DULA,H、DULA,VBe respectively classified as Discrete Fourier transform DFT vectors.
Preferably, the W2For selection matrix W1In column vector or linear weighted combination matrix W1In column vector from And form matrix W.
Preferably, it is described when the transmission antenna of the 3D MU-MIMO systems is four antennas and only transmits a code word Channel independence precoding transmissions are one layer of transmission, or carry out re-transmission transmission using two layers for a code word.
Preferably, when the transmission antenna of the 3D MU-MIMO systems is eight antennas and only transmits a code word, institute State channel independence precoding transmissions and use four layers or eight layers transmission for one layer of transmission, or for two code words.
Preferably, the first codebook matrix W1In matrix RCLA,H、RCLA,V、RULA,H、RULA,VBe respectively listed in [0,2 π] Chosen in phase interval in equally distributed discrete Fourier transform DFT vectors.
Preferably, the first codebook matrix W1In matrix RCLA,H、RCLA,V、RULA,H、RULA,VThe ripple that is formed of each row It is adjacent overlapping between beam group subset.
Preferably, when the pre-coding matrix W set in matrix it is more than one when, to different subcarriers in turn according to Positive sequence is using the logm in pre-coding matrix W set according to progress precoding.
Preferably, the pre-coding matrix W is at least one class index RI, the second code book matrix W2It is each Code word is in the second code book matrix W2Every other code word on distinguished by every layer of at least two beam selection vector.
Preferably, in the pre-coding matrix W code books each code word basic beam pattern corresponding to distribution feelings Condition, vertical and horizontal direction average packet is carried out to code book.
Second aspect, the present invention propose a kind of 3D MU-MIMO pre-coding matrix constructing apparatus, including：
Transmitter, for sending reference signal to receiving device；
Receiver, the pre-coding matrix instruction PMI sent for receiving the receiving device；
Determiner, for determining that the receiving device is based on reference signal and constructs the pre-coding matrix according to the PMI W。
Beneficial effects of the present invention：A kind of the 3D MU-MIMO pre-coding matrixes building method and device of the present invention, utilize Including the pre-coding matrix for supporting vertical direction to quantify with horizontal direction, active antenna system vertical direction can be made full use of The free degree, solve 4G LTE, the precision and system of CSI feedback in LTE-A and 5G IMT-2020 GSMs eMBB The problem of handling capacity.
Brief description of the drawings
With accompanying drawing, the invention will be further described, but the embodiment in accompanying drawing does not form any limitation of the invention.
Fig. 1 is the example structure schematic diagram of 3D MU-MIMO pre-coding matrixes constructing apparatus one of the present invention.
Embodiment
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings, and this is presently preferred embodiments of the present invention.
The cross-polarized arrays with vertical and horizontal polarization are set to tend to lead to the transmission of good separation at transmitter Passage, this sends attractive for multithread MIMO.Because use and the block diagonal of block diagonal structure pre-coding matrix The block diagonal structure matching of channel matrix, so being suitable using the precoding of block diagonal structure.From this view, typically The +/- 45 degree of cross-polarized arrays used are because send two not same polarizations in both vertical polarization and horizontal polarization Mixing, then it is block diagonal like that channel matrix, which is likely to not use horizontal and vertical polarization for another example, and this potentially increases Inter-stream interference is added, and has thus damaged MIMO performances, thus be considered as unattractive.Accordingly, for +/- 45 degree of cross-poles For change situation, block diagonal pre-coding matrix structure is not optimal, but it is very common that it, which is arranged in existing deployment,.
In this case, pre-coding matrix product structure is beneficial, because it is related to resolves into two by pre-coding matrix The product of individual matrix, cause the newly-generated channel with the trend as block diagonal.Because it is empty effectively to obtain block diagonal Intend channel, so the block diagonal pre-coding matrix W in product structure can be used now1To match its feature.
The present invention proposes a kind of 3D MU-MIMO pre-coding matrix building methods, including：
It is the first codebook matrix W for representing broadband or long-term channel characteristics to construct pre-coding matrix W1With representing arrowband or short Second code book matrix W of the phase characteristic of channel2Product W=W1*W2。
For the user terminal UE of the different floors positioned at same building, traditional bidimensional MIMO sometimes can not be spatially They are distinguished, so as to cause them to tend not to enough while be dispatched with same running time-frequency resource, i.e., can not use MU-MIMO.
When the transmission antenna of 3D MU-MIMO systems is four antennas and only one code word of transmission, the precoding of channel independence passes Defeated is one layer of transmission, or carries out re-transmission transmission using two layers for a code word；When the transmission antenna of 3D MU-MIMO systems is When transmitting for eight antennas and only a code word, channel independence precoding transmissions are one layer or two layers transmission, or are two code words Use four layers or eight layers transmission.
When the matrix in pre-coding matrix W set is more than one, different subcarriers is used according to positive sequence in turn pre- Logm in encoder matrix W set is according to progress precoding.
Based on common phase and selection W2Design follow structure for R10 version 8Tx codebook designs, common phase allows at two Phase adjusted is carried out between polarization group and generates DFT vectors according to two block diagonal matrixs.Due to W2Represent arrowband or short-term letter The codebook matrix of road characteristic, feedback cycle is shorter, thus excessively depends on W2Common phase regulation is carried out, is unfavorable for feedback and opens Pin.
Pre-coding matrix W is at least one class index RI, the second code book matrix W2Each code word in the second code book Matrix W2Every other code word on distinguished by every layer of at least two beam selection vector.Wherein, it is each in pre-coding matrix W code books The distribution situation of individual code word basic beam pattern corresponding to, vertical and horizontal direction average packet is carried out to code book.
The present embodiment, the horizontal direction at transmitter have to dual polarized antenna, have in vertical direction to dual polarized antenna, They collectively form dual polarization uniform planar aerial array, can spatially distinguish different UE.So, the first codebook matrix For：
Wherein, RCLA,H、RCLA,V、RULA,H、RULA,VIt is diagonal matrix, matrix DCLA,H、DCLA,V、DULA,H、DULA,VBe respectively classified as Discrete Fourier transform DFT vectors, the vector form with antenna-array response matches well.
In addition, W2For selection matrix W1In column vector or linear weighted combination matrix W1In column vector so as to forming Matrix W.
The present embodiment, W1Represent the codebook matrix of broadband or long-term channel characteristics, W2Represent arrowband or short-term channel behaviors Codebook matrix.W2It can be used for selection matrix W1In column vector so as to forming matrix W, or for linear weighted combination matrix W1In column vector so as to forming matrix W.The selection operation of wave beam group allows resource block (RB) of the field angle in same sub-band On refinement or adjustment so that frequency selectivity pre-coding gain is maximum, and the main origin W of phase-adjusted function1Undertake, Efficiently solve the problem of short-term code book feedback overhead is higher.
In the implementation, to ensure the selection accuracy of each beam vectors group inward flange wave beam, adjacent beams vector is directly Generally there is certain overlap.The overlapping of field angle can be favourable for reducing " edge effect ", i.e., prelisted when using subband When code or CSI feed back, it is ensured that public W1Matrix can more preferably be selected for the different resource block in identical precoding subband (RB)。
First codebook matrix W1In matrix RCLA,H、RCLA,V、RULA,H、RULA,VBe respectively listed in [0,2 π] phase interval Chosen in the discrete Fourier transform DFT vectors of even distribution.Also, the first codebook matrix W1In matrix RCLA,H、RCLA,V、 RULA,H、RULA,VThe wave beam group subset that is formed of each row between be adjacent overlapping.
As shown in figure 1, one embodiment of the invention propose a kind of 3D MU-MIMO pre-coding matrixes constructing apparatus and its Corresponding operation principle, it is specific as follows：
First, the transmitter for sending equipment sends reference signal to receiving device；
Then, the receiver for sending equipment receives the pre-coding matrix instruction PMI that receiving device is sent；
Finally, the determiner for sending equipment determines that receiving device is based on reference signal and constructs the first codebook matrix according to PMI W1, the second code book matrix W2, and by the first codebook matrix W1With the second code book matrix W2It is multiplied, product is the precoding constructed Matrix W.
Finally it should be noted that：Various embodiments above is merely illustrative of the technical solution of the present invention, rather than its limitations；To the greatest extent The present invention is described in detail with reference to foregoing embodiments for pipe, it will be understood by those within the art that：Its according to The technical scheme described in foregoing embodiments can so be modified, either which part or all technical characteristic are entered Row equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from various embodiments of the present invention technology The scope of scheme.

Claims (10)

  1. A kind of 1. 3D MU-MIMO pre-coding matrix building methods, it is characterised in that including：
    Reference signal is sent to receiving device；
    Receive the pre-coding matrix instruction PMI that the receiving device is sent；
    Determine that the receiving device is based on reference signal and constructs the pre-coding matrix W according to the PMI；
    The pre-coding matrix W is the first codebook matrix W for representing broadband or long-term channel characteristics1With representing arrowband or short-term letter Second code book matrix W of road characteristic2Product, first codebook matrix is：
    <mrow> <msub> <mi>W</mi> <mn>1</mn> </msub> <mo>=</mo> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <mo>)</mo> <mo>&amp;CircleTimes;</mo> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <mo>)</mo> </mrow> </mtd> <mtd> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <mo>)</mo> <mo>&amp;CircleTimes;</mo> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <mo>)</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <mo>)</mo> <mo>&amp;CircleTimes;</mo> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>C</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <mo>)</mo> </mrow> </mtd> <mtd> <mrow> <mo>-</mo> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>H</mi> </mrow> </msub> <mo>)</mo> </mrow> <mo>&amp;CircleTimes;</mo> <mrow> <mo>(</mo> <msub> <mi>R</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <msub> <mi>D</mi> <mrow> <mi>U</mi> <mi>L</mi> <mi>A</mi> <mo>,</mo> <mi>V</mi> </mrow> </msub> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> </mfenced> </mrow>
    Wherein, RCLA,H、RCLA,V、RULA,H、RULA,VIt is diagonal matrix, matrix DCLA,H、DCLA,V、DULA,H、DULA,VBe respectively classified as it is discrete Fourier transformation DFT vectors.
  2. 2. 3D MU-MIMO pre-coding matrix building methods according to claim 1, it is characterised in that the W2For selecting Select matrix W1In column vector or linear weighted combination matrix W1In column vector so as to forming matrix W.
  3. 3. 3D MU-MIMO pre-coding matrix building methods according to claim 1, it is characterised in that as the 3DMU- When the transmission antenna of mimo system is four antennas and only transmits a code word, the channel independence precoding transmissions are one layer of biography It is defeated, or carry out re-transmission transmission using two layers for a code word.
  4. 4. 3D MU-MIMO pre-coding matrix building methods according to claim 1, it is characterised in that as the 3D MU- When the transmission antenna of mimo system is eight antennas and only transmits a code word, the channel independence precoding transmissions are one layer of biography It is defeated, or use four layers or eight layers transmission for two code words.
  5. 5. 3D MU-MIMO pre-coding matrix building methods according to claim 1, it is characterised in that first code book Matrix W1In matrix RCLA,H、RCLA,V、RULA,H、RULA,VBe respectively listed in equally distributed direct computation of DFT in [0,2 π] phase interval Chosen in leaf transformation DFT vectors.
  6. 6. 3D MU-MIMO pre-coding matrix building methods according to claim 1, it is characterised in that first code book Matrix W1In matrix RCLA,H、RCLA,V、RULA,H、RULA,VThe wave beam group subset that is formed of each row between be adjacent overlapping.
  7. 7. according to any described 3D MU-MIMO pre-coding matrix building methods of claim 1-6, it is characterised in that when described When matrix in pre-coding matrix W set is more than one, the precoding square is used according to positive sequence in turn to different subcarriers Logm in battle array W set is according to progress precoding.
  8. 8. 3D MU-MIMO pre-coding matrix building methods according to claim 7, it is characterised in that the precoding square W is at least one class index RI, the second code book matrix W for battle array2Each code word in the second code book matrix W2It is all its Distinguished in his code word by every layer of at least two beam selections vector.
  9. 9. 3D MU-MIMO pre-coding matrix building methods according to claim 7, it is characterised in that the precoding square The distribution situation of each code word basic beam pattern corresponding in battle array W code books, vertical and horizontal direction is carried out to code book Average packet.
  10. A kind of 10. 3D MU-MIMO pre-coding matrix constructing apparatus, it is characterised in that including：
    Transmitter, for sending reference signal to receiving device；
    Receiver, the pre-coding matrix instruction PMI sent for receiving the receiving device；
    Determiner, for determining that the receiving device is based on reference signal and constructs the pre-coding matrix W according to the PMI.
CN201710748275.7A 2017-08-28 2017-08-28 A kind of 3DMU MIMO pre-coding matrixes building method and device Pending CN107342799A (en)

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CN112534734A (en) * 2018-08-02 2021-03-19 瑞典爱立信有限公司 Adaptive co-phasing using co-phasing matrices for beamforming for wireless communications

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CN104184690A (en) * 2014-09-03 2014-12-03 西安电子科技大学 Double-layer pre-coding method applicable to 3D MIMO system
CN106982088A (en) * 2017-04-13 2017-07-25 南京邮电大学 A kind of multiple stream transmission method based on CSI RS ports in 3D mimo systems
CN107094041A (en) * 2017-05-09 2017-08-25 深圳市雷克斯托通信有限公司 Building method, transmission method, transmission equipment and the receiving device of pre-coding matrix

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102412885A (en) * 2011-11-25 2012-04-11 西安电子科技大学 Three-dimensional wave beam forming method in long term evolution (LET)
CN104184690A (en) * 2014-09-03 2014-12-03 西安电子科技大学 Double-layer pre-coding method applicable to 3D MIMO system
CN106982088A (en) * 2017-04-13 2017-07-25 南京邮电大学 A kind of multiple stream transmission method based on CSI RS ports in 3D mimo systems
CN107094041A (en) * 2017-05-09 2017-08-25 深圳市雷克斯托通信有限公司 Building method, transmission method, transmission equipment and the receiving device of pre-coding matrix

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112534734A (en) * 2018-08-02 2021-03-19 瑞典爱立信有限公司 Adaptive co-phasing using co-phasing matrices for beamforming for wireless communications
CN112534734B (en) * 2018-08-02 2023-08-18 瑞典爱立信有限公司 Adaptive co-phasing for beamforming using co-phasing matrices for wireless communications

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Application publication date: 20171110