2种高性能的空频OFDM检测器

提出了两种高性能的串行迭代的基于线性最小均方误差（LMMSE）估计的空频正交频分复用（OFDM）检测器。第一种检测器利用了已调信号的有限字母特性，通过后验概率的计算更新先验信息；第二种方法结合了判决反馈技术。通过分析和仿真表明，所提的算法在可接受的复杂度下，相对于已有的干扰消除器有效地消除了空频OFDM系统在频率选择性多径信道下的误码平层。

Two High Performance Detectors for Space-Frequency OFDM System

Two high performance detectors were proposed.Both are sequential iterative detectors using linear minimum mean squared error(LMMSE) estimation.In the first detector,the finite alphabet property of modulated symbols was used.During the process of iteration,the prior information was also updated through posteriori probability calculations.In the second one,the decision feedback was used.Analysis and simulations demonstrated that compared to the existing interference cancellation method,and the proposed algorithms can effectively eliminate the error floor of space-frequency orthogonal frequency division multiplexing(OFDM) system over frequency selective multipath channels with affordable implementation complexity.