一种新的IEEE 802.16系统调制编码模式切换方案  

A New Modulation and Coding Modes’ Switch Scheme for IEEE 802.16 System

作　　者：黄珊[1,2] 何加铭[1,2] 曾兴斌[1,2] 李佳树[1,2] 

机构地区：[1]宁波大学通信技术研究所,浙江宁波315211 [2]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《宁波大学学报（理工版）》2010年第2期33-36,共4页Journal of Ningbo University：Natural Science and Engineering Edition

基　　金：科技部国际科技合作与交流专项(2009DFA12120);国家自然科学基金(60671037);宁波市工业攻关项目(2007B10051)

摘　　要：IEEE 802.16系统支持多种调制编码模式以实现通信质量和传输速率最优化.为了降低无线信道衰减时变性和随机性的影响,提高系统的最大吞吐量,提出了一种新的调制编码模式切换方案.该方案综合考虑了前向纠错码机制(FEC)和选择性自动重传机制(SR-ARQ)对系统吞吐量的影响.通过OPNET对信道质量和系统吞吐量建模,比较了传统的调制模式切换方案与新的调制编码模式切换方案的性能.仿真结果表明:在允许的网络丢包率范围内,新方案可进一步提高系统的吞吐量.IEEE802.16 system supports seven modulation and coding modes to ensure the quality of communication and maximize the speed of data transmission.In order to release the impact of wireless channel’s instability and improve the system throughput,the paper presents a new modulation and coding mode switch scheme.The scheme takes into consideration the impact of FEC and SR-ARQ on system throughput.Through constructing the model between channel’s state and system throughput by OPNET,the comparison is conducted between the traditional modulation modes switch scheme,the new modulation and coding modes switch scheme.Simulation shows that the new switch scheme can enlarge system throughput without additional packet losses.

关 键 词：IEEE 802.16 调制编码模式 前向纠错码 自动重传 

分 类 号：TP393.04[自动化与计算机技术—计算机应用技术]