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 | |
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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. |
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