新的时变信道下空时分组编码多用户系统解码器设计
Design of New Decoder for Space-Time Block Coded Multiuser System over Time-Selective Fading Channels
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摘要: 该文提出了两种新的适用于时变信道下空时分组编码多用户系统的解码器设计方案。空时分组编码多用户系统下，传统的迫零(Zero Forcing, ZF)和最小均方误差(Minimum Mean Squared Error, MMSE)解码器设计均假定信道准静态衰落。信道时变时，这些传统解码器在解码某用户信号时引入符号间干扰(Inter-Symbol Interference, ISI)，且这种干扰随信道时变增大而增加。基于此，该文设计了两种新的解码器，该解码器可显著降低信道时变的影响。仿真结果表明，随信噪比(Signal-to-Noise Ratio, SNR)增加，两种传统解码器均出现误码率性能平层，而新解码器获得了显著的性能改善。
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关键词:
- 空时分组编码;多用户;时变信道;解码器
Abstract: This paper proposed two new decoders for space-time block coded multiuser system over time-selective fading channels. For space-time block coded multiuser system, the design of conventional Zero Forcing (ZF) and Minimum Mean Squared Error (MMSE) decoder is based on the assuming that channels are quasi-static. When the channels are time-selective fading, these conventional decoders induce the Inter-Symbol Interference (ISI), in order to obtain one users signals, furthermore, the ISI becomes larger resulted from the increase of the channels time variations. So, this paper designed two new decoders and these decoders reduced greatly the influence of the channels time variations. Simulation results show that the both conventional decoders exhibit error floors, whereas the new decoders obtain more notable performance gains as the increase of Signal-to-Noise Ratio (SNR) values. -
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