OFDM系统中采用Turbo编码的混合ARQ  

Implementation of Hybrid Automatic Repeat Request(HARQ) with Turbo Codes in OFDM System

作　　者：罗德曼[1] 廖志芳[1] 

机构地区：[1]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《计算机与现代化》2010年第7期5-8,共4页Computer and Modernization

摘　　要：在OFDM宽带移动通信中,为了保证无线信道的成功传输,需要加入相关的差错控制技术。本文首先详细介绍OFDM系统中被广泛应用的差错控制技术——混合ARQ,分析Ⅰ类HARQ和Ⅱ类HARQ以及实现Ⅱ类HARQ的4种方法。通过仿真实验将使用HARQ机制的情况与没有采用ARQ机制的情况进行比较。仿真结果表明:与没有ARQ的传输系统相比,Ⅰ类HARQ增加开销之后并没有获得明显增益;而Ⅱ类HARQ能够满足QoS的要求,提高无线信道利用率。In wireless broadband mobile radio communications like OFDM,to ensure successful communications in such wireless transmission channels,some powerful multi-access schemes and error-control techniques are necessary.One of them is Hybrid Automatic Repeat reQuest with Turbo Code.In this paper HARQ type-Ⅰ,HARQ type-Ⅱ and the four strategies designed for implementing HARQ type-Ⅱ are analyzed.Two kinds of methods,one without ARQ and the other one with HARQ are simulated under AWGN and multi-path fading channel.The simulation results show that the system without ARQ,and the one with HARQ type-Ⅰ have no significant gain.On the other hand the one with HARQ type-Ⅱ satisfies the Quality of Service（QoS） requirements and improves the utilization of wireless channel.

关 键 词：ARQ OFDM HARQ FEC/ARQ 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]