Journal of South China University of Technology (Natural Science Edition) ›› 2009, Vol. 37 ›› Issue (5): 12-16.

• Electronics, Communication & Automation Technology • Previous Articles     Next Articles

A Space-Time Cooperative Scheme Based on OFDM

Ji Yan-cheng  Ge Jian-hua  Gao Ming   

  1. State Key Laboratory of Integrated Service Networks, Xidian University, Xi＇an 710071, Shannxi, China
  • Received:2008-05-19 Revised:2008-08-18 Online:2009-05-25 Published:2009-05-25
  • Contact: 季彦呈（1982-），男，博士生，主要从事协作分集及空时码研究． E-mail:xd．jyc@163．com
  • About author:季彦呈（1982-），男，博士生，主要从事协作分集及空时码研究．
  • Supported by:

    国家“863”计划项目（2006AA012270）;广东省～国家自然基金委联合基金资助项目（U0635003）;陕西省自然科学基金资助项目（2007F07）

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Abstract:

In order to obtain a multi-path gain of orthogonal frequency division multiplexing （OFDM） in a space- time cooperative system, a space-time cooperative scheme based on the correlation of subcarriers in OFDM is pro- posed. In this scheme, by changing the order of the same signals in different phases of cooperative transmission, the signals are transmitted in two subearrier channels with the lowest correlation. Then, corresponding two-phase signals are combined together by the base station via a maximal ratio combing （MRC）. Moreover, the outage pro- bability is analyzed, and an optimal power allocation strategy is proposed. Finally, the theoretical bit error rate is analyzed. Simulated results demonstrate that the proposed scheme results in significant gains in bit error rate （BER） performance, and helps to obtain one-order multi-path gains without reducing the transmission rate.

Key words: space-time cooperation, orthogonal frequency division multiplexing, outage probability, multi-path gain, power allocation