一种利用信源冗余的Turbo均衡新算法

为克服无线衰落信道中严重的符号间干扰( ISI)的影响,提出了一种新的利用信源冗余的Turbo均衡算法。该算法将联合信源信道译码技术与Turbo均衡技术结合起来,在均衡、译码、信源之间建立起软信息交互的环路,有效提高了整体接收的性能。外信息传递( EXIT)图分析与计算机仿真均表明,尽管信源冗余给译码器带来的性能提升较为有限,但是将这部分信息反馈回均衡器后,在严重ISI信道,信源冗余度为70%时,整体接收的性能改善约为9.5 dB,基本达到了理想加性高斯白噪声( AWGN)信道下的误码性能。

A novel Turbo equalization method using residual source redundancy

To combat the effect of intersymbol interference (ISI) while transmitting data over wireless fading channels, a new Turbo equalization algorithm using residual source redundancy is proposed.In this algorithm, joint source-channel decoding technique and Turbo equalization are combined together, so that soft information can exchange with each other among equalization, decoding and source, which efficiently improves the performance in the receiver. The performance of the proposed algorithm is analyzed by using extrinsic information transfer (EXIT) chart and verified by simulations. Results show that the proposed approach outpeforms the conventional Turbo equalization by 9.5 dB in severe ISI channel,while the residual source redundancy rate is 70%,which is near to the BER performance in idea AWGN channel.