基于OFDM编码的水声通信差分解码技术  

Research on differential decoding of OFDM-based system in underwater acoustic communication

作　　者：赵安邦 周彬 沈广楠 解立坤 惠俊英 

机构地区：[1]哈尔滨工程大学水声技术国防科技重点实验室,哈尔滨150001

出　　处：《声学技术》2010年第2期144-147,共4页Technical Acoustics

基　　金：重点实验室基金(9140C2001010801);国家自然科学基金(60802060);哈尔滨工程大学基础研究(HEUFT07072)资助

摘　　要：正交频分复用(OFDM)具有良好的抗频率选择性衰落性能,抗多径和脉冲噪声能力强,同时具有在高效带宽利用率情况下的高速传输能力以及简单的实现方法。OFDM在应用中也存在一些问题,例如对频率偏移和相位噪声敏感等。研究了基于正交频分复用编码的水声通信差分解码技术。所提出的差分解码方案通过测量相邻OFDM信号的相位差进行解码,从而降低了信道时变特性对水声通信系统的影响,特别是相位误差的累积效应。湖上试验数据差分解码的结果显示了所提方案的有效性,极大地降低了通信系统的误码率。Differential decoding with Orthogonal Frequency Division Multiplexing（OFDM） in underwater acoustic communication is studied.OFDM-based communication system is a modulation scheme with good performance such as the resistance to frequency selective fading,multi-path,and strong capabilities of impulse-noise.Moreover it has high speed transmission capabilities with bandwidth-efficient rate,and is simple to realize.The above-mentioned good performance made it one of the hotspots in studies of high speed underwater acoustic communication.However,it is sensitive to frequency offset and phase noise.Differential decoding method uses the phase differential of adjoining OFDM symbol to decode information.The scheme can resist the accumulation of phase error induced by the time-variant communication channel.Lake experiment results show that the proposed method is effective and feasible,and it can decrease the bit error rate effectively.

关 键 词：OFDM编码 多普勒频偏 多径干扰 差分解码 移动水声通信技术 

分 类 号：TN911.72[电子电信—通信与信息系统]