一种适合OFDM系统的发射分集技术
A Transmit Diversity Technique for OFDM
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摘要: 该文详细分析了OFDM系统的发射分集技术，当信道特性在两个符号期间不发生变化时，发射分集技术能有效地提高OFDM系统的性能。然而在无线移动环境下，信道特性是时变的，它将严重影响发射分集的性能。为了降低时变信道的影响，该文运用判决反馈技术对分集技术中的判决方法作了改进，并在室外环境下进行了仿真分析。仿真结果农明改进后的发射分集技术在无线移动环境下能有效地提高系统性能。Abstract: A simple transmit diversity technique assumes that channel does not change over two symbol period of time. Therefore, this technique is not suitable for time varying channels. This paper modifies the transmit diversity technique to accommodate time varying channel (mobile multipath channel). Simulation results show that the proposed modification works well in fast varying channel.
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