基于预测的混和自动重传请求算法  

A Hybrid Automatic Repeat Request Algorithm based on Prediction

作　　者：张强[1] 闫斌[1] 杨蔚[2] 周辉[2] 

机构地区：[1]电子科技大学自动化工程学院,四川成都611731 [2]四川省电力公司,四川成都610000

出　　处：《通信技术》2016年第5期544-548,共5页Communications Technology

摘　　要：为了解决无线传输过程中无线信道易受多径效应、抖动效应、衰落等因素的影响而使传输的有效性和可靠性得不到保障的问题,提出了一种基于预测的混和自动重传请求算法。利用隐马尔科夫模型预测传输过程中下一时刻的丢包率,根据不同时刻丢包率状态的比值关系动态调节里德-索洛蒙(Reed-Solomon)码的监督元数量。仿真结果表明,该算法与传统Ⅰ型混和自动重传请求(HARQ)算法和Ⅱ型混和自动重传请求(HARQ)算法相比,能够明显减少重传次数,降低误码率,通信可靠性明显提高。In order to solve the problem of transmission validity and reliability with the influence factors in- cluding muhipath effect,jitter effect and fading,a hybrid automatic repeat request algorithm based on pre- diction is proposed. By using the hidden Markov model to predict the packet-loss rate of the next time dur- ing the transfer process, and in accordance with the ratio of packet -loss rate at different times, the redun- dancy in Reed-Solomon codes is tuned. Simulation results indicate that compared with the traditional type- I hybrid automatic repeat request algorithm and the type-Ⅱ hybrid automatic repeat request algorithm, the proposed algorithm could significantly reduce the number of retransmission times, and the bit error rate, and remarkably raise the communication reliability.

关 键 词：无线传输 混和自动重传请求算法 隐马尔科夫模型 预测 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]