北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2005, Vol. 28 ›› Issue (4): 107-110.doi: 10.13190/jbupt.200504.107.xuk

• 研究报告 • 上一篇    

基于自适应发送波束成形的STB〖JP9〗C-〖JP〗OFDM系统

徐凯,罗涛,尹长川,乐光新   

  1. 北京邮电大学 电信工程学院, 北京 100876
  • 出版日期:2005-08-28 发布日期:2005-08-28

OFDM System Based on Adaptive Transitting Optimization Beamforming

XU Kai,LUO Tao,YIN Changchuan,YUE Guangxin   

  1. School of Telecommunication Engineering, Beijing University of Posts and Teleco mmunications, Beijing 100876, China
  • Online:2005-08-28 Published:2005-08-28

摘要:

提出了一种基于信道特性的自适应发送波束成形空时分组码正交频分复用(STB〖JP9〗C-〖J P〗OFDM)系统方案. 给出了最大接收信噪比条件下最优发射权值的闭式解和性能仿真结果. 该系统能最大限度地利用所有的分集资源并对发射功率进行最优分配. 与传统的STB〖JP9〗C-〖JP〗OFDM系统相比,系统性能有明显的提高,而与系统较复杂的空时格码OFDM系统和TC〖JP9〗M-〖JP〗STB〖JP9〗C-〖JP〗OFDM系统相比,在高信噪比条件下能获得较大信噪比增益. 讨论了存在信道估计偏差时,自适应发送波束成形STB〖JP9〗C-〖JP〗OFDM系统的性能.

关键词: 正交频分复用, 波束成形, 空时分组码

Abstract:

An adaptive transmitting optimization beamforming space time block codingorthogonal frequency division multiplex (STB〖JP9〗C-〖JP〗OFDM) [JP2]system, called adaptive beamfo rming STB〖JP9〗C-〖JP〗OFDM (AB〖JP9〗F-〖JP〗STB〖JP9〗C-〖JP〗OFDM) system based on channel state information (CSI), was proposed. And the optimization beamforming weight vector was derived in case of maximal receiver signaltonoise ratio. The performance of AB〖JP9〗F-〖JP〗STB〖JP9〗C-〖JP〗OFDM system when there are channel estimation errors w as given. Performance and computer simulation results of the system over wireless Reyleigh fading channels show that all the diversity resource can explored by the system, and the performance of the system can be improved significantly when compared with STB〖JP9〗C-〖JP〗OFDM, spacetime trellis codin〖JP9〗g-〖JP〗OFDM(STT〖JP9〗C-〖JP〗OFDM) and trellis code modulatio〖JP9〗n-〖JP〗STB〖JP9〗C-〖JP〗OFDM (TC〖JP9〗M-〖JP〗STB〖JP9〗C-〖JP〗OFDM) system.

Key words: orthogonal frequency division multiplex, beamforming, spacetime block coding

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