Method for improving wireless system transmission diversity performance and transmitter

A technology of transmit diversity and wireless communication system, applied in the field of wireless communication system

Active Publication Date: 2011-04-20
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008]The disadvantage of the prior art solution is that a feedback channel is required which would occupy the signaling bandwidth of the reverse channel, i.e. would occupy the Signaling bandwidth of the transmitter channel

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  • Method for improving wireless system transmission diversity performance and transmitter
  • Method for improving wireless system transmission diversity performance and transmitter
  • Method for improving wireless system transmission diversity performance and transmitter

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Embodiment Construction

[0021] Alamouti codes are a type of space-time transmit diversity (STTD) codes, and this application is related to Alamouti codes. In order to facilitate the understanding of the present invention, the encoding is briefly described below. In short, Alamouti coding provides a method to achieve two-branch transmit diversity with one receiver. In the first symbol period, two antennas a1 and a2 simultaneously transmit two signals s1 and s2 respectively. In the next symbol period, antenna a2 sends a signal Antenna a1 transmits signal * indicates complex conjugate. Adopting Alamouti coding can improve performance in terms of bandwidth and diversity.

[0022] In order to increase the amount of information sent by the channel per unit time, a parallel data stream scheme, namely D-STTD scheme, is introduced. However, at the receiver these data streams interfere with each other and some interference suppression algorithm must be used to recover the transmitted symbols. It is kno...

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Abstract

The invention is related to a method for improving the performance of transmit diversity in a wireless communication system. The method comprises the steps of generating at least one phase shift angle sequence and applying phase shift to one of said a number of transmitter antennas according to said at least one phase shift angle sequence. The invention is also related to a transmitter for use ina wireless communication system, the transmitter comprises phase sequence generator which is used to create a sequence of phase shift angles and sends phase shift angles periodically to a multiplier,and a multiplier which is used to multiply one Alamouti encoded data substream with current phase shift angle received from said phase sequence generator.

Description

technical field [0001] The present invention relates to a wireless communication system having multiple antennas at both the transmitting end and the receiving end of a fading channel, and more particularly, to a method and transmitter for improving the performance of a slow-moving mobile station using transmit diversity. Background technique [0002] In a wireless communication system, in order to improve system performance, multiple antennas (or smart antennas) are used. The basic purpose of multi-antenna is transmit diversity, that is, multiple copies of transmit signals transmitted from different antennas are provided to the receiver respectively. Since the fading of these signals can be assumed to be independent under ideal conditions, transmit diversity can improve the robustness of communication on fading wireless links. [0003] Transmit diversity is typically performed using Alamouti codes. In "A simple transmit diversity technique for wireless communication" (S.M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/06
CPCH04B7/0682
Inventor 马蒂尔斯·温斯特姆
Owner HUAWEI TECH CO LTD
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