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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Problems solved by technology

[0004] Usually, since the uplink pilot signal resources are limited, in 3GPP R1-090042, the complete covariance matrix

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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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[0023] Various embodiments of the present invention will be described below. The following description provides detailed details for a thorough understanding of these embodiments. However, those skilled in the art should understand that the present invention can be implemented without some of the details. In addition, some well-known structures or functions may not be shown or described in detail, so as not to unnecessarily obscure the relevant description of the various embodiments of the present invention.

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

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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...

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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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