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Precoding method and device

A technology of precoding and precoding matrix, which is used in multi-frequency code systems, digital transmission systems, baseband system components, etc.

Active Publication Date: 2015-06-10
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing MIMO precoding is difficult to take into account the two performance indicators of the precoding reliability and the MIMO system capacity realized by the system at the same time under the condition of medium and low signal-to-noise ratio.

Method used

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Embodiment Construction

[0109] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0110] The technical solutions provided by the embodiments of the present invention can be applied to various wireless communication networks, for example: global system for mobile communication (referred to as GSM) system, code division multiple access (code division multiple access, referred to as CDMA) system , wideband code division multiple access (WCDMA for short) system, universal mobile telecommunications system (UMTS for short) system, general packet radio service (GPRS for short) system, Long term evolution (LTE for short) system, long term evolution advanced (LTE-A for short) system, worldwide interoperability for microwave access (WiMAX for short) system, etc. The terms "network" and "system" are used interchangeably.

[0111] In the embodiment of the present invention, a base station (referred to as BS fo...

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Abstract

The embodiment of the invention provides a precoding method comprising the following steps: a pilot signal transmitted by a transmitting end is received; channel state information estimation is performed according to the pilot signal to acquire a channel mean and a channel covariance; a precoding matrix is calculated according to the channel mean and the channel covariance; and the transmitting end precodes a data signal needing to be transmitted according to the precoding matrix, and the receiving end de-precodes a received precoded signal according to the precoding matrix. Better MIMO precoding reliability performance and higher MIMO system capacity can be obtained for MIMO-OFDM precoding based on the average signal to interference and noise ratio criterion under the condition of channel state information statistics, and reliability performance and MIMO system capacity better than those of codebook-based precoding can be obtained in a low-correlation environment.

Description

technical field [0001] The present invention relates to the field of mobile communication, in particular to a precoding method and device. Background technique [0002] Multiple-input multiple-output (MIMO) technology can improve the system space throughput without increasing the system bandwidth, and can also significantly improve the signal transmission quality by means of the effective use of space diversity. In a MIMO system, precoding technology uses channel state information (CSI) at the transmitter to preprocess the transmitted signal to eliminate inter-symbol interference (ISI) or inter-user interference and improve system capacity. processing technology. Common precoding types mainly include linear precoding and nonlinear precoding. Linear precoding mainly includes two types of linear precoding based on codebook and non-codebook. Codebook-based precoding is to share a known codebook set at the transmitting and receiving end. The codebook set contains multiple pre...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L5/00H04L27/26
Inventor 陈庆春曾韬张琴琴孙德福
Owner HUAWEI TECH CO LTD
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