文章摘要
赵亮.一种新颖的水声相干通信接收算法[J].声学技术,2007,(2):291~295
一种新颖的水声相干通信接收算法
A novel receiver algorithm for underwater acoustic coherent communications
投稿时间:2006-01-12  修订日期:2006-04-21
DOI:
中文关键词: 水声通信  自适应判决反馈均衡器  迭代译码
英文关键词: underwater acoustic communications  adaptive decision feedback equalizer  iterative decoding
基金项目:
作者单位E-mail
赵亮 中国科学院声学研究所, 北京, 100080 xdyjs204@hotmail.com 
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中文摘要:
      为了克服水声信道的多径衰落,消除码间干扰,获得可靠的数据传输,提出了一种新颖的水声相干通信接收算法。该新型算法有两个优点:一是将自适应判决反馈均衡器和迭代译码技术相结合,二是译码采用Turbo译码原理,整个译码系统可以看作是串联迭代译码器,只是其中的内部译码器被编码比特对数似然率(LLR)计算器所取代,有效地降低了运算复杂度。同时,自适应判决反馈均衡器采用了变步长因子算法,改善了均衡器的收敛速度。仿真实验验证了该组合接收算法的性能.
英文摘要:
      In order to overcome multipath fading and eliminate intersymbol interference(ISI),a novel receiver algorithm for underwater acoustic coherent communication is proposed in this paper.The algorithm has two advantages.First,the algorithm combines adaptive decision feedback equalizer(DFE) and iterative decoding technology.Second,decoder adopts Turbo principle.The system can be regarded as a serially concatenated iterative decoding scheme whereby the inner decoder is substituted by the calculator of log-likelihood ratio(LLR),computational complexity is reduced.Simultaneously,adaptive decision feedback equalizer adopts the algorithm with variable step-size factor,so the speed ratio of the convergence is improved.Simulation is carried out to evaluate the composite algorithm performance.
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