文章摘要
张宏滔,陆佶人,陈敬军.一种水声通信中基于信道估计的假设反馈自适应均衡器[J].声学技术,2005,(2):89~93
一种水声通信中基于信道估计的假设反馈自适应均衡器
Channel-estimation based hypothesis-feedback adaptive equalization for underwater acoustic communications
投稿时间:2005-01-21  修订日期:2005-03-26
DOI:
中文关键词: 水声通信  自适应均衡  信道估计  直接序列码分多址
英文关键词: underwater acoustic communication  adaptive equalization  channel estimation  DS/CDMA
基金项目:国防预研基金资助项目(10106060703)
作者单位
张宏滔 东南大学无线电工程系, 南京, 210096 
陆佶人 东南大学无线电工程系, 南京, 210096 
陈敬军 上海船舶电子设备研究所, 上海, 200025 
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中文摘要:
      直接序列码分多址(DS/CDMA)是一种受关注的水下声通信网多址接入方案。提出一种基于信道估计的水声DS/CDMA系统自适应码片级均衡器。水声信道的时变特性要求自适应均衡器系数以码片速率更新,而不是以码元速率更新。在线性均衡之前利用信道估计器抑制由先前发送的码片引起的码片间干扰,仅对少量幅值较大的信道抽头做均衡,有效地降低了运算复杂度。仿真实验验证了均衡器的性能。
英文摘要:
      Direct sequence code division multiple access (DS/CDMA) as a technique for underwater acoustic networks is attracting attention from researchers Adaptive chip-level equalization based on channel estimation is proposed in this paper Time variability of the underwater channel requires that receiver adaptation be performed at the chip rate,rather than the symbol rate Channel estimation is used to cancel inter chip interferences caused by hypothetically transmitted chips prior to linear equalization By selecting only significant channel components,computational complexity is reduced Simulation is carried out to evaluate the equalization performance.
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