Pre-coding matrix feedback method and terminal

A precoding matrix and matrix technology, which is applied in the direction of signalling, digital transmission system, error prevention, etc., can solve the problems of not being able to meet the planar antenna array, high overhead, etc.

Inactive Publication Date: 2015-02-11
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, the existing standard codebook only supports linear array antennas, and the number of antenna ports is not greater than 8, which cannot meet the requirements of new technologies such as 3D MIMO or Massive MIMO. The planar antenna array and / or the number of ports exceeds 8 Requirements; on the other hand, when designing the codebook, it is necessary to consider the trade-off between overhead and performance, because overhead is also a problem faced by the actual system
For such a large-scale antenna array, the dimension of its channel coefficient matrix is ​​very large. At this time, it is very expensive to quantize these coefficient matrices more accurately.

Method used

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  • Pre-coding matrix feedback method and terminal

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Experimental program
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Embodiment 1

[0086] In this embodiment, both the base station and the terminal store two types of codebooks: the first type of codebook U i ,i=1,...,N s1 , where U i is N t ×N m complex matrix of N s1 is the number of codewords in the first type of codebook; υ is the total layer information of the user's data, where, is N m ×υ matrix of complex numbers, is the number of codewords in the second type of codebook, and υ is not greater than N m positive integer of . The terminal completes the feedback process of the precoding matrix index through steps (1.1) and (1.2):

[0087] (1.1) The terminal measures the downlink channel matrix information H from the base station to the terminal, and determines the first type of codebook index i according to the channel matrix information H, and its corresponding codeword is U i , and feed back the codebook index i to the base station when the period T1 comes.

[0088] Of course, you can also use uplink sounding (Sounding) information or o...

Embodiment 2

[0103] In this embodiment, the construction method of the first type of codebook, that is, the function f 1 Expressed in the form of the Kronecker product of two vectors. Both the base station and the terminal store two types of codebooks, the first type of codebook U i , among them, U i is N t ×N m complex matrix of i=1,…,N s1 ,N s1 is the number of codewords in the first type of codebook.

[0104] The i-th codeword U of the first type of codebook i The kth column u of i,k , for f 1 (v i,k ,h i,k ), where f 1 (v,h) is the N v ×1 vector v i,k ,h i,k and N h ×1 vector h maps to N t The function of the vector by 1, that is, f 1 (v,h) means N v ×1 vector v i,k ,h i,k and N h The form of the kronecker product of the vector h ×1, k=1,...,N m ,i=1,...,N s1 . Among them, the specific form of the kronecker product is related to the indexing method of the antenna in the antenna array.

[0105] In this embodiment, there are some more specific examples.

[0106]...

Embodiment 3

[0119] In this embodiment, the construction method of the first type of codebook, that is, the function f 1 Represented as the expanded form of two vectors. Both the base station and the terminal store two types of codebooks, the first type of codebook U i , among them, U i is N t ×N m complex matrix of i=1,…,N s1 ,N s1 is the number of codewords in the first type of codebook.

[0120] The i-th codeword U of the first type of codebook i The kth column u of i,k , for f 1 (v i,k , h i,k ), k=1,...,N m ,i=1,...,N s1 , where f 1 (v,h) is the N v ×1 vector v i,k , h i,k and N h ×1 vector h maps to N t A function of a vector by 1, f 1 The specific form of (v, h) is related to the indexing method of the antenna in the antenna array.

[0121] In this embodiment, there are some more specific examples.

[0122] Example a: The configuration on the base station side is as follows Figure 7 In the planar antenna array shown, each position contains a single-polarized a...

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Abstract

The present invention discloses a precoding matrix feedback method and terminal; the terminal measures a channel matrix H, and, in accordance with channel matrix H, determines information regarding a first matrix U i and information regarding a second matrix P j v (301); the terminal reports index information indicating the first matrix U i and index information indicating the second matrix P j v (302); alternatively, the terminal reports parameter information which constitutes the first matrix U i and parameter information which constitutes the second matrix P j v.

Description

technical field [0001] The invention relates to the field of wireless digital communication, in particular to a precoding matrix feedback method and a terminal. Background technique [0002] In the Long Term Evolution (LTE) system, its protocol is the Release8 (R8 for short) version, which stipulates that there are three forms of Channel State Information (CSI): Channel Quality Indication (CQI) , a precoding matrix indicator (Pre-coding Matrix Indicator, PMI), and a rank indicator (Rank Indicator, RI). Among them, the CQI is an index to measure the quality of the downlink channel. PMI means that only in the transmission mode of closed-loop spatial multiplexing, the terminal (User Equipment, UE) tells the base station (eNode B, eNB) what precoding matrix should be used to send it to the UE according to the measured channel quality The physical downlink shared channel (Physical Downlink Shared Channel, PDSCH) is precoded. The feedback granularity of the PMI can be that one ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06
CPCH04L1/00H04B7/0617H04B7/0456H04B7/0478H04B7/0619H04L1/0029
Inventor 肖华华陈宪明陈艺戬鲁照华
Owner ZTE CORP
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