自适应调制系统在衰落信道中的性能分析  

Performance Analysis of an Adaptive Modulation System over Fading Channels

作　　者：雷鸣[1] 徐月善[1] 蔡鹏[1] 张平[1] 

机构地区：[1]北京邮电大学电信工程学院,北京100876

出　　处：《北京邮电大学学报》2004年第1期31-35,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家"863计划"项目(2001AA123016)

摘　　要：分析了一种自适应调制系统在Nakagami衰落信道中的性能.这种自适应调制系统采用了4种调制方式,调制方式转换的准则是在时变信道中维持一定的目标误比特率,这一点是很多无线业务所期望的.在这一前提下,本文采用数值分析的方法分析了自适应调制系统的吞吐量和传输中断率等性能.仿真结果表明,自适应调制系统可以获得较高的数据吞吐量,而其传输中断率在一定条件下可以保持较低的水平.The performance of the adaptive modulation system over Nakagami fading channels is analyzed, which utilizing four modulation modes. The optimization criterion of the setting of the modulation switching levels is to maintain the target BER, which is desired by many data services. Under this condition, the performance analysis of the throughput and the transmission outage probability of the adaptive modulation system are presented. Finally, the simulation results show that the adaptive modulation system can theoretically achieve high throughput performance, and low transmission outage probability under certain conditions.

关 键 词：自适应调制 NAKAGAMI衰落信道 误比特率 吞吐量 传输中断率 无线通信 

分 类 号：TN929.5[电子电信—通信与信息系统]