基于压缩感知的OFDM水声通信信道二次估计算法-声学技术.PDF

第 32 卷第 5 期 声 学 技 术 Vol.32, No.5 2013 年 10 月 Technical Acoustics Oct., 2013 基于压缩感知的 OFDM 水声通信信道 二次估计算法 乔 钢，王 巍，王 玥，邢思宇 (哈尔滨工程大学水声技术重点实验室，哈尔滨 150001) 摘要：该文主要研究 OFDM 水声通信信道二次估计技术，针对传统信道二次估计算法跟踪估计缓慢时变水声信道存 在误码遗传的缺点，提出了一种基于压缩感知的信道二次估计算法。该算法结合水声信道的稀疏特性，利用经过编 码校验后的大多数可靠信息，二次匹配追踪信道频域响应，作为系统均衡器的反馈输入信息和次时段信道初始信息， 有效地抑制了系统的误码遗传。通过 Matlab 仿真实验和水池试验，验证了基于压缩感知的信道二次估计算法的可靠 性和高效性。 关键词：水声通信；正交频分复用；稀疏信道估计；压缩感知；匹配追踪； 中图分类号：TN929.3 文献标识码：A 文章编号：1000-3630(2013)-05-0357-05 DOI 编码：10.3969/j.issn1000-3630.2013.05.002 The complex channel estimation based on compress sensing in OFDM via underwater acoustic channel QIAO Gang, WANG Wei, WANG Yue, XING Si-yu (Science and Technology on Underwater Acoustic Laboratory, Harbin Engineering University, Harbin 150001, China) Abstract: A twice decision channel equalization algorithm of Orthogonal Frequency Division Multiplexing (OFDM) via shallow underwater acoustic (UWA) channel is studied in this paper. The corrected and the raw information are used for channel re-estimation. By taking the advantage of shallow UWA channel’s spares characters, the channel can be constructed by matching pursuit (MP) ameliorated twice decision channel equalization algorithm based on compress sensing (CS) theory without error propagation. Experimental results performed with Monte Carlo simulation and tank-trial data are provided for demonstrating that the proposed algorithm can effectively offer confined error propaga- tion and significantly increase the quality of the system. Key words: underwater acoustic channel; orthogonal frequency