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Method and device for feeding back channel state information in MIMO system

A technology for feedback channel and state information, applied in the field of communication, can solve the problem of not reflecting the channel change and so on

Active Publication Date: 2016-11-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the long-period feedback W 1 After selection, since W 1 The 4 DFT vectors in are far apart, when the channel changes slowly, W 2 The same DFT vector combination will always be selected, so that the codeword cannot reflect channel changes

Method used

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  • Method and device for feeding back channel state information in MIMO system
  • Method and device for feeding back channel state information in MIMO system
  • Method and device for feeding back channel state information in MIMO system

Examples

Experimental program
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Effect test

Embodiment 1

[0161] The number of antennas of the base station eNB is 8, and the number of receiving antennas of the terminal is 2. The base station sends a 16Tx channel state measurement pilot to the terminal UE, and the terminal performs channel measurement according to the received measurement pilot, and feeds back CSI information, including PMI information, to the base station.

[0162] The codebook of 8Tx is U 8 =W 1 ·W 2 ;

[0163] in: W 1 , n = X n 0 0 X n where n = 0,1 , . . , 15

[0164] X n ...

Embodiment 2

[0188] The number of antennas of the base station eNB is 8, and the number of receiving antennas of the terminal is 2. The base station sends a 16Tx channel state measurement pilot to the terminal UE, and the terminal performs channel measurement according to the received measurement pilot, and feeds back CSI information, including PMI information, to the base station.

[0189] The codebook of 8Tx is U 8 =W 1 ·W 2 ;

[0190] in: W 1 , n = X n 0 0 X n where , n = 0,1 , . . , 15

[0191] X ...

Embodiment 3

[0209] The number of antennas of the base station eNB is 16, and the number of receiving antennas of the terminal is 2. The base station sends a 16Tx channel state measurement pilot to the terminal UE, and the terminal performs channel measurement according to the received measurement pilot, and feeds back CSI information, including PMI information, to the base station.

[0210] The Rank1 / 2 codebook structure of 16Tx is:

[0211] U 1 = v 0 βv 1 U 2 = ...

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Abstract

The invention provides a method and a device for feeding back channel state information in an MIMO (Multi-input Multi-output) system. The method comprises the step that terminal UE feeds back CSI (Channel State Information) to a base station eNodeB, wherein the CSI comprises codebook index information; the codebook index information comprises a first type of codebook index set I and a second type of codebook index set J; the combination of the first type of index set I and the second type of index set J is used for indicating a pre-coding matrix U; the pre-coding matrix U is an Nt*r matrix; in the matrix, Nt represents the total number of ports or the total number of antennas, and r represents the number of transmission layers; the pre-coding matrix U is at least composed of Q*r basic vectors with the dimensional degree of Nt / Q; Q is not less than 2, r is not less than 1 and both Q and R are positive integers; and column extraction of the basic vectors is carried out from a matrix B, the matrix B is composed of M columns of Nt / Q dimension vectors, and M is a positive integer.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and device for feeding back channel state information in a multiple-input multiple-output system. Background technique [0002] In the wireless communication system, the transmitting end and the receiving end adopt the method of spatial multiplexing, and obtain a higher rate by using multiple antennas. Compared with the general spatial multiplexing method, an enhanced technology is that the receiving end feeds back channel information to the sending end, and the sending end uses some transmit precoding techniques according to the obtained channel information to greatly improve the transmission performance. For single-user MIMO, channel feature vector information can be directly used for precoding; for multi-user MIMO, more accurate channel information is required. [0003] In the long term evolution (Long Term Evolution, LTE) plan, the feedback of channel information mainly ut...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/16
CPCH04B7/0478H04L1/06H04B7/0473H04B7/0626
Inventor 赵晶陈艺戬李儒岳李剑肖华华
Owner ZTE CORP
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