基于优化Raptor码的水下传感器网络可靠传输机制  

Reliable transmission mechanism based on optimized Raptor code for underwater sensor network

作　　者：柳秀秀[1,2] 杜秀娟 LIU Xiuxiu;DU Xiujuan(School of Computer Science, Qinghai Normal University, Xining 810008, P.R. China;Key Laboratory of IoT of Qinghai Province, Xining 810008, P.R. Chia)

机构地区：[1]青海师范大学计算机学院,西宁810008 [2]青海省物联网重点实验室,西宁810008

出　　处：《重庆邮电大学学报（自然科学版）》2017年第5期696-703,共8页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

基　　金：国家自然科学基金(61162003);青海省自然科学基金(2015-ZJ-904);青海省物联网重点实验室建设专项(2017-ZJY21);赛尔网络下一代互联网技术创新项目(NGII20151101;NGII20160307);河北省物联网数据采集与处理工程中心~~

摘　　要：针对水声通信带宽低、时延长、误码率高、多普勒效应显著等特征,分析了传统可靠传输机制在水下传感器网络应用的局限性,提出了基于数字喷泉码-优化Raptor码的水下传感器网络可靠传输机制。采用反馈控制对Raptor码内码的鲁棒孤子分布和多项式描述的Shokrollahi度分布进行优化设计,降低了编码包平均度。进一步对Raptor码的内码—弱化的LT码(Luby transform codes)的编解码进行优化,实现了快速的编解码。基于优化Raptor码的可靠传输机制采用反馈控制,动态评估信道删除概率,从而提高编解码和通信效率。通过Aqua-Sim仿真工具对提出的可靠传输机制与基于编码的多跳协同可靠数据传输(coding based multi-hop coordinated reliable data transfer,CCRDT)机制进行仿真对比。结果表明,所提出的可靠传输机制明显降低了传输开销,提高了数据吞吐量。Underwater acoustic communication is characterized by low bandwidth,long propagation delay,high error probability and Doppler effect.In this paper,we analyze the limitations of traditional reliable transmission applied in underwater sensor network.Based on digital fountain codes optimized Raptor code,we propose a reliable transmission mechanism for underwater sensor network.We adopts feedback control to optimize the robust soliton distribution and the Shokrollahi degree distribution of polynomial description of Raptor code which reduce the average degree of encoding packet.Further,in this paper,we optimize codec of Raptor code,so a fast encoding and decoding is realized.The reliable transmission mechanism based on optimized Raptor code uses feedback control to dynamically evaluate the erasure probability of channel.So feedback control improves the efficiency of codec and communication.Using the Aqua Sim simulation tool,we conduct a serial of experiments,and take a comparison between our reliable transmission mechanism and CCRDT.Simulations results show that our reliable transmission mechanism reduces overhead and improves throughput significantly.

关 键 词：水下传感器网络 可靠传输机制 RAPTOR码 反馈控制 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]