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Channel state information feedback method and device

A technology of channel state information and user equipment, applied in digital transmission systems, electrical components, error prevention, etc., can solve the problems of limited uplink pilot signal resources, consumption of uplink pilot signal resources, etc., and achieve optimal downlink transmission performance , the effect of reducing the amount of feedback

Active Publication Date: 2012-07-18
ALCATEL LUCENT SHANGHAI BELL CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Usually, since the uplink pilot signal resources are limited, in 3GPP R1-090042, the complete covariance matrix detected by the user equipment side is fed back to the eNB, which will consume a lot of uplink pilot signal resources

Method used

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  • Channel state information feedback method and device
  • Channel state information feedback method and device
  • Channel state information feedback method and device

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Embodiment Construction

[0023] Various embodiments of the present invention will be described below. The ensuing description provides details for a general understanding of these embodiments. However, it will be understood by those skilled in the art that the present invention may be practiced without some of these details. Also, some well-known structures or functions may not be shown or described in detail to avoid unnecessarily obscuring the description of various embodiments of the invention.

[0024] figure 1 A schematic diagram showing the basic architecture of a TDD system in which the present invention is applied. Assume that the TDD system includes base station 10 , user equipment 20 located in the coverage area of ​​base station 10 , and neighboring base stations of base station 10 , where base station 10 has 4 antennas and user equipment 20 has 2 antennas. That is to say, figure 1 The TDD system shown is a 4x2 TDD MIMO system.

[0025] The base station 10 sends a 4×1 signal v(x) to th...

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Abstract

Disclosed is a downlink channel sate information (CSI) feedback method in a time division duplex (TDD) system, wherein the CSI means downlink interference and additive noise; the method comprises the following steps: receiving signals from a base station; obtaining covariance matrix omega of the downlink interference and the additive noise according to the received signals; obtaining space sub-channel response mu after interference whitening on the basis of singular value decomposition (SVD) according to the covariance matrix omega of the downlink interference and additive noise and downlink channel response hardware description language (HDL); obtaining downlink CSI according to the covariance matrix omega of the downlink interference and additive noise and the space sub-channel response mu; and feeding the downlink CSI back to the base station. Compared with the prior art, the method reduces the feedback quantity of the downlink interference and noise, and effectively uses the limited uplink pilot signal resource. According to various linear downlink multiple user multiple antenna pre-coding scheme, such as the memory enhancement technology (MET) pre-coding scheme, the effective improvement can be directly changed into better downlink transmission performances.

Description

technical field [0001] Embodiments of the present invention relate to wireless communication, in particular to a method for feeding back downlink channel state information CSI in a time division duplex TDD system and corresponding user equipment. Background technique [0002] In wireless cellular communication systems, near-optimal high spectral efficiency for downlink transmission can be achieved by using linear MET precoding. In practical application, in the case of a frequency reuse factor of 1, the downlink transmission has inter-cell interference. Since traditional MET design does not take interference into consideration, it will degrade downlink transmission performance. [0003] In LTE-A, channel reciprocity is an important feature for effectively controlling multi-antenna systems in TDD systems. 3GPP R1-090042 first proposed a TDD reciprocity-based interference assistance information feedback for downlink MET precoding design. Specifically, in 3GPP R1-090042, it i...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L1/06
Inventor 陆犇石璟
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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