深空喷泉码文件传输协议设计与误码率性能研究

Design and Performance Analysis versus Error Rate of Fountain Code-Based File Delivery Protocol for Deep Space

由于深空通信具有高时延和高误码率的特点,使得基于反馈的传输协议效率降低,可利用基于喷泉编码的传输协议提升传输效率.本文利用中心极限定理研究喷泉编码文件传输协议误码率性能,对中心极限定理概率模型进行仿真,仿真结果说明此概率模型贴近实际情况.选取中心极限定理作为协议设计的准则,推导了基于正态分布分位数函数的协议发送数据包数n的表达式.此表达式保证只要发送n个数据包,则成功概率不低于δ.

The efficiency of automatic repeat quest（ARQ）based transmission protocols decrease due to the high delay and high error rate of deep space communication.Fountain code-based transmission protocols can be adopted to improve the transmission efficiency under such circumstances.In this paper,a central limit theorem was employed to analyze the performance versus error rate of the fountain code-based file delivery protocol.A simulation was conducted in accordance with the probability model of central limit theorem.The result shows that the central limit theorem probability model is close to the actual situation.The central limit theorem can be taken as the principle of protocol design.An expression of packets sent by normal quantile function-based protocol was derived.This expression ensures if the number of packets sent is not less than n,then the successful rate is not less than δ.