文章摘要
房栋,李宇,黄海宁,尹力.水声通信中内嵌锁相环的格型均衡器[J].声学技术,2010,(5):528~532
水声通信中内嵌锁相环的格型均衡器
Least squares lattice equalizer with embedded phase-locked loop in underwater communications
投稿时间:2009-10-16  修订日期:2009-12-28
DOI:
中文关键词: 锁相环  自适应均衡器  最小二乘格型
英文关键词: phase-locked loop  adaptive equalizer  Least Squares Lattice(LSL)
基金项目:“863”计划项目(2006AA09Z117);国家自然科学基金(60672118)
作者单位E-mail
房栋 中国科学院声学研究所, 北京, 100190
中国科学院研究生院, 北京, 100190 
fangdong1984@gmail.com 
李宇 中国科学院声学研究所, 北京, 100190  
黄海宁 中国科学院声学研究所, 北京, 100190  
尹力 中国科学院声学研究所, 北京, 100190  
摘要点击次数: 1215
全文下载次数: 842
中文摘要:
      最小二乘格型(Least Squares Lattice,LSL)自适应均衡算法具有收敛速度快、算法复杂度低、对舍入误差不敏感等特点,适于应用在水下实时通信中。在LSL均衡算法的基础上,为增强对多普勒频移的跟踪能力,在均衡器中加入等效二阶锁相环(PLL),提出了两种算法:后置PLL的LSL算法(LSL-PLL-post)和预置PLL的LSL算法(LSL-PLL-pre)。对RLS、LSL、LSL-PLL-post和LSL-PLL-pre四种算法进行了仿真,结果表明:PLL显著增强了LSL均衡器对多普勒频移的跟踪能力;在多径和多普勒环境下,LSL-PLL-pre是四种算法中性能最好的。湖试数据分析表明,LSL-PLL-pre算法性能略优于LSL-PLL-post算法,更具实用价值。
英文摘要:
      Least squares lattice(LSL) adaptive equalizer brings some advantages such as fast rate of convergence,lower computational complexity,and insensitiveness to round off errors,etc.Consequently,it is suitable for real-time underwater communications.In order to achieve better tracking to Doppler frequency shift,an equivalent second order phase-locked loop(PLL) is inserted into LSL equalizer,and two kinds of algorithms are proposed,which are named as LSL with post-deposited PLL(LSL-PLL-post) and LSL with pre-deposited PLL(LSL-PLL-pre),respectively.The RLS,LSL,LSL-PLL-post and LSL-PLL-pre algorithm are simulated,showing that the PLL brings distinct improvement of Doppler tracking ability of LSL adaptive equalizer.And LSL-PLL-pre algorithm is the best of four in circumstance of multi-path and Doppler shift.Furthermore,LSL-PLL-pre algorithm is proved practical and slightly better than LSL-PLL-post algorithm with analysis of experimental data from lake trial.
查看全文   查看/发表评论  下载PDF阅读器
关闭