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研究了在空频块码正交频分复用(SFBC OFDM)无线通信系统中适用于多径衰落信道下的迭代接收机的设计,导出了一种迭代的联合信道估计与符号检测的算法.在提出的算法中,信道估计器交替地工作于2种模式.在训练阶段,采用基于DFT的估计器估计出信道状态信息,并且采用所提出的算法估计出噪声方差和信道响应的互相关矩阵.在数据传输模式下,迭代地获得发送数据和信道状态信息.为了抑制由于符号检测中误判引起的错误传播,提出了一种简单的错误传播判定准则,并使用了一种自适应的训练机制来抑制误差传播.仿真结果显示,与传统的迭代算法相比,所提出的算法能够提供更好的误码性能,且节约了系统开销.
The design of an iterative receiver for multipath fading channels in a space-frequency block orthogonal frequency division multiplexing (SFBC OFDM) wireless communication system is studied. An iterative joint channel estimation and symbol detection algorithm is derived. In the proposed algorithm, the channel estimator operates alternately in two modes.In the training phase, the DFT-based estimator estimates the channel state information and uses the proposed algorithm to estimate the cross-correlation matrix of noise variance and channel response In the data transmission mode, the transmit data and the channel state information are obtained iteratively.In order to suppress the error propagation caused by misjudgment in symbol detection, a simple criterion of error propagation is proposed and an adaptive training Mechanism to suppress the error propagation.The simulation results show that compared with the traditional iterative algorithm, the proposed algorithm can provide better error performance and save system overhead.