动态自适应Pattern时延差编码水声通信  

A Dynamic Adaptive Pattern Time Delay Shift Coding Scheme for Underwater Acoustic Communication

作　　者：赵安邦[1] 陈凯[1] 陈阳[1] 惠俊英 解立坤[1] 

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：《西安交通大学学报》2010年第8期78-82,共5页Journal of Xi'an Jiaotong University

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

摘　　要：针对Pattern时延差编码(PDS)水声通信中常规解码不能适应信道变化及收发节点运动的问题,提出了一种动态自适应解码方法.该方法采用变长滑动窗动态地搜寻每个携带信息的Pat-tern码元,根据解码结果实时地修正下一码元偏移量,将有用信息最大限度地送入拷贝相关器进行解码.该方法能够较好地自适应信道起伏及收发节点距离变化对信号造成的影响,使系统性能较常规拷贝相关解码大幅提高.在吉林省松花湖的试验结果表明,采用动态自适应解码的PDS通信体制,在距离1000m通信时,误比特率较常规解码降低一个数量级,1500m时实现了无误码通信.该方法简单实用,适应性强,为构建高速、稳健的水下通信网打下了良好基础.Focusing on the problem that the routine decoding method cannot adapt to the changes of the acoustic channel and movements of sending and receiving nods in the pattern time delay shift coding underwater acoustic communication system,a dynamic adaptive decoding method is proposed.The method dynamically searches for every pattern code that carries with information using variable-length sliding window,real-timely corrects the deviation of the next code according to the decoding results and sends useful information as more as possible to copy correlator for decoding.The method is adaptable to the influence of received signals due to the movements of sending and receiving nods and changes of the acoustic channel,and greatly improves the performance of the system compared with the routine decoding method.Trials in Songhua Lake of Jilin province show that the bit error rate of the dynamic adaptive decoding method is zero when the communicating distance is 1500 meters,and is less a tenfold than the routine decoding method when the communicating distance is 1000 meters.The proposed method is simple,has strong adaptability,and gives a foundation for high-rate and robust underwater communication nets.

关 键 词：水声通信 PATTERN时延差编码 动态自适应 

分 类 号：TN911.72[电子电信—通信与信息系统]