文章摘要
王晋兴,朱敏.水声DS-CDMA通信中多相位假设码片速率自适应判决反馈均衡算法研究[J].声学技术,2009,(3):212~216
水声DS-CDMA通信中多相位假设码片速率自适应判决反馈均衡算法研究
A study of chip rate phase hypothesis adaptive decision feedback equalization for DS-CDMA underwater acoustic communication
投稿时间:2008-06-16  修订日期:2008-09-01
DOI:
中文关键词: 水声通信  空间分集  直接序列扩频  码分复用  码片速率判决反馈均衡  相位假设
英文关键词: underwater acoustic communications  spatial diversity  Direct-Sequence(DS) spread spectrum  Code Division Multiple Access(CDMA)  chip-rate decision feedback equalization  phase hypothesis
基金项目:国家863计划(2006AA09Z212)
作者单位
王晋兴 中国科学院声学研究所, 北京, 100190
中国科学院声学研究所, 北京, 100190 
朱敏 中国科学院声学研究所, 北京, 100190 
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中文摘要:
      研究了直接序列扩频码分复用(DS-CDMA)通信中基于多相位假设的码片速率自适应判决反馈均衡算法。水声信道的衰落和多普勒频移会严重影响扩频信号的相关特性,需要在做解扩频之前进行多普勒频移补偿和信道自适应均衡。将空间分集-多普勒频移补偿-自最佳自适应判决反馈均衡算法应用到DS-CDMA通信中,提出一种基于多相位假设的码片速率自适应判决反馈均衡算法,并用实际的千岛湖实验数据和仿真数据对算法性能进行了分析。结果表明算法以增加计算复杂性为代价显著提高了DS-CDMA通信性能,在复杂快变的多途和多普勒频移条件下可以保证低的误符号率,在低信噪比条件下能够稳定工作,总体性能良好。
英文摘要:
      A study of chip rate phase hypothesis adaptive decision feedback equalization algorithm for DS-CDMA underwater acoustic communication is presented.Underwater acoustic communication channel is a delay-Doppler double spreading channel.Fading and Doppler spreading severely degrade the correlation characteristic of the spread spectrum signals,so Doppler shift compensation and equalization are needed before decoding.By applying Space diversity-Doppler compensation-Fast Self-Optimized adaptive decision feedback equalization algorithm into DS-CDMA communication,a chip rate phase hypothesis adaptive decision feedback equalization algorithm for DS-CDMA underwater acoustic communication is proposed and its performance is analyzed with real lake trial data and simulation data.At the price of computational complexity,the algorithm dramatically improves DS-CDMA communication quality.Very low symbol error rate is achieved under fast changing multi-path and Doppler shift condition,and the equalizer is stable under low SNR.The overall performance of this algorithm is satisfactory.
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