MIMO系统中的迭代分组MAP检测算法
doi: 10.3724/SP.J.1146.2006.02094
Iterative Group-Based MAP Detection for MIMO Wireless Systems
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摘要: 该文提出了在分组MAP检测器内部进行干扰信息更新和检测信息迭代反馈的检测算法。在MIMO系统基本的分组MAP检测算法基础上，利用先检测分组产生的后验信息替代先验信息提高干扰信号的估计精确度，进一步可以使用迭代反馈的方法在检测器内部进行反馈检测分组的后验信息，从而提高了检测信号的分集度。仿真结果表明在未编码系统中改进的分组检测方法能够显著地提高系统误码率性能，在编码系统中能够加快整个系统的收敛。Abstract: Based on the basic group-based MAximum a Posterior(MAP) detector, a novel detection scheme is proposed that uses a posterior information from the detected groups instead of a priori information from the decoder. The new scheme can improve the estimation precision of the interference. Further an iterative detector that uses a posterior information from last detection is presented. The iterative detector can fully use the output information from the detector and have a performance improvement further. Simulation results show that the new detectors have a significant performance gain over basic group-based MAP algorithm in uncoded systems and have a faster convergence in coded systems.
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