基于硬判决的BICM-ID的Turbo均衡及其改进

Turbo equalization and its improvement in BICM-ID based on hard-decision

传统的接收机中均衡器和信道译码器是相互独立的,Turbo均衡是一种联合均衡和译码技术,通过迭代在均衡器和译码器之间交换外信息,从而获得更好的性能。将Turbo均衡中的软干扰抵消(SIC)算法应用到基于硬判决的BICM-ID系统中,并对其进行改进。仿真结果表明在不同衰落程度的ISI信道中算法能有效收敛,且系统均衡后性能随着信噪比的增加越来越接近AWGN下性能。

Conventional receivers executed equalization and channel decoding independently. Turbo equalization was a technique which combined equalization and decoding. It got better performance by exchanging the extrinsic information iteratively between the equalizer and decoder. The SIC algorithm of Turbo equalization to BICM-ID system based on hard-decision was applied and an improved method was also proposed. Simulation results show that this algorithm leads to convergence in ISI channels with different fading degree and it approaches the performance in AWGN gradually along with the increasing SNR.