正交频分复用水声通信的判决信道均衡算法

doi:10.3969/j.issn.0255-8297.2012.06.003

应用科学学报 ›› 2012, Vol. 30 ›› Issue (6): 573-580.doi: 10.3969/j.issn.0255-8297.2012.06.003

正交频分复用水声通信的判决信道均衡算法

马雪飞1，乔钢1，赵春晖2，马璐1

1. 哈尔滨工程大学水声技术国家重点实验室，哈尔滨150001
2. 哈尔滨工程大学信息与通信工程学院，哈尔滨150001

收稿日期:2010-10-20 修回日期:2011-08-10 出版日期:2012-11-27 发布日期:2011-08-10
通信作者: 马雪飞，博士生，研究方向：高速水下通信，E-mail:xuefeima@163.com
作者简介:马雪飞，博士生，研究方向：高速水下通信，E-mail:xuefeima@163.com；乔钢，教授，博导，研究方向：水声信号处理、矢量水声通信，E-mail: qiaogang@hrbeu.edu.cn；赵春晖，教授，博导，研究方向：通信信号处理，E-mail: zhaochunhui@hrbeu.edu.cn
基金资助:
国家“863”高技术研究发展计划基金(No.2009AA093601-2)；国家自然科学基金(No.11274079)；国防基础科研计划基金(No. B2420110007)资助

Decision Directed Channel Equalization for OFDM Underwater Acoustic Communications

MA Xue-fei1, QIAO Gang1, ZHAO Chun-hui2, MA Lu1

1. National Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China
2. College of Information and Communication Engineering, Harbin Engineering University,Harbin 150001, China

Received:2010-10-20 Revised:2011-08-10 Online:2012-11-27 Published:2011-08-10

摘要/Abstract

摘要： 复杂的水声信道会对正交频分复用子载波产生幅度衰落和相位畸变. 针对信道时变和插值带来的误差对信道估计的影响，提出了一种基于判决的水声信道均衡算法. 该算法采用差错控制编码作为判决方式，将判决后的数据作为导频进行信道均衡，根据信道环境的不同分为判决迭代均衡和判决二次均衡两种方式. 仿真和湖上实验结果表明，该算法在不降低频带利用率的情况下可以有效提高系统性能.

关键词: 水声通信, 正交频分复用, 信道均衡, 判决均衡

Abstract: Complication of ocean channels causes sub-carrier amplitude fading and phase distortion in underwater communication. To reduce the effects of channel estimation error due to time variation and interpolation error, a decision-directed channel equalization algorithm for OFDM-based communication is proposed. Error control codes are used for decision making so that the data decisions can be used as pilots, with which channel estimation is performed. Taking into account different environment conditions, equalization is done using a decision-directed scheme with block piloting and a decision twice-equalization scheme with comb piloting. Results of simulation and lake experiments are promising, showing that the proposed scheme can effectively
improve system performance without loss of bandwidth efficiency.

Key words: underwater acoustic communication, orthogonal frequency division multiplexing (OFDM), channel equalization, decision equalization

中图分类号:

TN914.4

马雪飞1，乔钢1，赵春晖2，马璐1. 正交频分复用水声通信的判决信道均衡算法[J]. 应用科学学报, 2012, 30(6): 573-580.

MA Xue-fei1, QIAO Gang1, ZHAO Chun-hui2, MA Lu1. Decision Directed Channel Equalization for OFDM Underwater Acoustic Communications[J]. Journal of Applied Sciences, 2012, 30(6): 573-580.

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正交频分复用水声通信的判决信道均衡算法

Decision Directed Channel Equalization for OFDM Underwater Acoustic Communications

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