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

作　　者：马雪飞 乔钢 赵春晖[2] 马璐 

机构地区：[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

出　　处：《应用科学学报》2012年第6期573-580,共8页Journal of Applied Sciences

基　　金：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

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.Complication of ocean channels causes sub-carrier amplitude fading and phase distortion in under- water 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 chan- nel 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.

关 键 词：水声通信 正交频分复用 信道均衡 判决均衡 

分 类 号：TN914.4[电子电信—通信与信息系统]