文章摘要
周青,田亚男,沈建文.单载波频域判决反馈均衡水声通信技术研究[J].声学技术,2017,(6):528~532
单载波频域判决反馈均衡水声通信技术研究
Research on single carrier frequency domain decision feedback equalization for underwater acoustic communication
投稿时间:2017-06-12  修订日期:2017-10-20
DOI:10.16300/j.cnki.1000-3630.2017.06.005
中文关键词: 水声通信  单载波  可靠性  频带有效利用率  水池试验
英文关键词: underwater acoustic communication  single carrier  reliability  bandwidth utilization  pool test
基金项目:国家海洋公益性行业科研专项(2014418040-4)、国家自然科学基金项目(61471137,50509059)
作者单位E-mail
周青 通信信息控制和安全技术重点实验室, 浙江嘉兴 314033
中国电子科技集团公司第三十六研究所, 浙江嘉兴 314033 
 
田亚男 哈尔滨工程大学水声工程学院, 黑龙江哈尔滨 150001
哈尔滨工程大学水声技术重点实验室, 黑龙江哈尔滨 150001 
tianyanan0206@163.com 
沈建文 云南昆船电子设备有限公司, 云南昆明 650236  
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中文摘要:
      水声信道中多途干扰严重,由多途效应引起的码间干扰是影响水声通信系统的关键性因素。单载波频域均衡(Single-Carrier Frequency Domain Equalization,SC-FDE)技术基于正交频分复用(Orthogonal Frequency Division Multiplexing,OFDM)技术提出,能有效对抗水声信道中的多途干扰,同时能避免OFDM技术峰值平均功率比高的不足。文中先介绍判决反馈均衡算法,并与其他均衡算法的抗多途性能进行比较。然后为提高系统均衡的可靠性和水声信道带宽利用率,对传统数据帧结构进行改进。将独特字(Unique Words,UW)序列均分,提高水声信道估计的精度,进而降低误码率,增加传输的可靠性;增加数据帧中有用信息符号,系统误码性能几乎不变,水声信道频带有效利用率提高。最后开展水池试验,验证了算法的有效性和可靠性。
英文摘要:
      The inter-symbol interference caused by multi-channel propagation is the key factor affecting the performance of underwater acoustic communication system. Single-carrier frequency domain equalization (SC-FDE) technique based on orthogonal frequency division multiplexing (OFDM) can effectively combat the multi-channel interference in underwater acoustic channel, while avoiding the high peak to average power ratio of the OFDM technology. In this paper, the decision feedback equalization algorithm is first introduced and compared with the other two equalization algorithms, and then, in order to improve the reliability of SC-FDE system and the effective utilization of system bandwidth, the traditional data frame structure is improved. The unique words (UW) are divided to improve the accuracy of channel estimation, thereby reducing the bit error rate, increasing the reliability of transmission; In order to improve the bandwidth utilization rate, the number of useful symbols in the data frame is increased when the UW sequence length is constant, and the system error performance is almost unchanged. Finally, the pool test is carried out to verify the effectiveness and reliability of the algorithm.
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