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Performance of an OFDM-SDMA based system in a time-varying multi-path channel

机译：基于OFDM-SDMA系统在时变多路径通道中的性能

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Significant investigation has been recently conducted towards combining OFDM which mitigates inter-symbol interference and SDMA which improves bandwidth efficiency. OFDM-SDMA systems need accurate channel estimation, because it is from this information that the separation of co-channel users is performed. Usually, the channel is assumed stationary because the frame duration is chosen smaller than the coherence time. However this choice limits the system efficiency. This paper discusses the performance of an OFDM-SDMA based system under a time-varying multi-path channel. The system under study uses the basic combining algorithm based on the linear Minimum Mean Square Error (MMSE) criterion for user separation and a pilot based scheme independent from channel statistics for channel estimation. We investigate in particular the effect of the pilot subcarrier arrangement on the BER performance and deduce an optimal configuration in a channel with both delay and Doppler spread.
机译：最近朝着组合的符合符号干扰和SDMA来进行显着调查，这提高了带宽效率。 OFDM-SDMA系统需要准确的信道估计，因为它来自该信息，即执行共同信道用户的分离。通常，假设信道静止，因为帧持续时间被选择小于相干时间。然而，这种选择限制了系统效率。本文讨论了基于OFDM-SDMA基于多路径通道的性能的性能。正在研究的系统使用基于线性最小均方误差（MMSE）标准的基本组合算法进行用户分离和基于导频的方案，与信道估计的信道统计不同。我们特别调查导频子载波布置对BER性能的影响，并在具有延迟和多普勒扩展的频道中推断出最佳配置。

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