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Method for improving wireless system transmission diversity performance and transmitter

A transmit diversity and wireless communication system technology, applied in the field of wireless communication systems, can solve the problems of not bringing effect, occupying the signaling bandwidth of the reverse channel, and occupying the signaling bandwidth, so as to achieve the effect of improving the performance of transmit diversity

Active Publication Date: 2008-07-23
HUAWEI TECH CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

Controlling the phase of the rest of the antennas does not lead to better results
[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

Method used

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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

[0018] 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 transmits a signal (-s 1 * ), antenna a1 sends signal s 2 * , * means complex conjugate. Adopting Alamouti coding can improve performance in terms of bandwidth and diversity.

[0019] In order to increase the amount of information sent by the channel per unit time, a parallel data flow scheme, namely the 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 sy...

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Abstract

The invention relates to a method for improving the transmission diversity performance of a wireless communication system. The method comprises the steps of generating at least one sequence of phase shift angles and applying a phase shift to one of said at least one transmitter antennas based on said at least one sequence of phase shift angles. The present invention also relates to a transmitter for a wireless communication system, the transmitter includes a phase sequence generator and a multiplier, the phase sequence generator is used to generate a phase shift angle sequence and periodically sends the phase shift angle to the multiplier, A multiplier is used to multiply one of the Alamouti encoded data sub-streams with the 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 Applications(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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