基于MIMO-DFE的BLAST接收机的差错传递控制的研究

近期对于BLAST(Bell Laboratories Layered space-time)的研究从平坦衰落信道转向频率选择性衰落信道,基于MIMO-DFE(Multiple-Input-Multiple-Output Decision Feedback Equalizer)的接收机结构因此受到了广泛的关注.然而由于这类接收机本身的反馈结构,性能可能会由于差错传递而大大下降.本文将传统判决反馈均衡器的差错传递控制方法推广到多入多出(MIMO)系统中,仿真结果表明,本文提出的带差错传递控制的接收机能够有效控制差错传递.

The study of error propagation on MIMO-DFE based BLAST receivers

MIMO-DFE (Multiple-Input-Multiple-Output Decision Feedback Equalizer) based receiver architectures are researched recently to detect signals in BLAST on frequency-selective channels. Due to their recursive structure, these receivers may suffer from error propagation which results in an overall mean square error degradation. In this paper a MIMO-DFE based BLAST receiver with limited error propagation is proposed, which employs both norm constraint on feedback filter taps and soft decision device. Simulation results show that the proposed receiver outperforms conventional ones in various frequency selective channels.