一种用于水声通信的喷泉码最大似然译码方法  

Maximum Likelihood Decoding of Fountain Codes in Underwater Acoustic Communication

作　　者：武岩波[1] 朱敏[2] 

机构地区：[1]中国科学院声学研究所声场声信息国家重点实验室,北京100190 [2]中国科学院声学研究所海洋声学技术中心,北京100190

出　　处：《电子与信息学报》2016年第2期288-293,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61471351);中国科学院声学研究所所长择优基金(Y454101231)

摘　　要：针对水声通信特点,研究随机线性喷泉码及最大似然译码,在分块数较小的包传输中纠正删除错误。传统的最大似然译码为整包统一处理,译码延迟大。该文提出一种逐行累增的高斯消去方法,将译码过程划分到各块到达时隙中执行,利用二进制分布求和的概率公式对单块到达所需计算量进行分析。在实际水声通信处理平台上进行了验证,满足实时计算需求,可用于水下图像、传感器数据等的传输。Considering the characteristics of underwater acoustic communication, random linear fountain codes with maximum likelihood decoding are studied to correct erasure errors in the short packet transmission. In existing maximum likelihood decoding methods, processing begins when all the necessary blocks are available, resulting to the unacceptable decoding delay. An increment Gaussian elimination method is proposed to decrease the decoding delay by utilizing the time-slots of every block. The computation complexity is analyzed based on the principle of the probability distribution of the summation of binary random variables. The real-time ability of the proposed method is verified on the low-cost DSP chip for the underwater acoustic modem. The method is applicable to underwater transmissions of images, and sense data.

关 键 词：水声通信 喷泉码 高斯消去法 随机线性喷泉码 

分 类 号：TN929.3[电子电信—通信与信息系统]