BICM-ID中的一种复合型Turbo均衡  

Combined turbo equalization in BICM-ID

作　　者：赵春晖[1] 吕强[1] 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2009年第3期323-327,共5页Journal of Harbin Engineering University

摘　　要：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.针对BICM-ID系统的均衡问题,将Turbo均衡中的SIC(软干扰抵消)算法做修正后应用到基于硬判决的BICM-ID系统中,并将其与MAP(最大后验概率)算法结合,提出一种复合型Turbo均衡算法.仿真结果表明,在不同衰落程度的ISI信道中算法均能有效收敛,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 execute equalization and channel decoding independently. Turbo equalization is a technique which combines equalization and decoding. It gets better performance by exchanging the extrinsic information iteratively between the equalizer and decoder. To equalize a bit-interleaved coded modulation with iterative decoding （BICM-ID） system, we applied the modified successive interference cancellation （SIC） algorithm of Turbo equalization to a BICM-ID system, based on hard-decisions, and combined it with the （MAP） algorithm. We proposed this as a combined Turbo equalization algorithm. Simulation results show that this algorithm leads to convergence in inter-symbol interference （ISI） channels with different degrees of fading, and it gradually approaches the performance in additive white Gaussian noise （AWGN） as well as gradually increasing the SNR.

关 键 词：硬判决 基于迭代译码的比特交织编码调制 TURBO均衡 软干扰抵消 最大后验概率 

分 类 号：TN911.22[电子电信—通信与信息系统]