信道粒度可变的分块自适应OFDM传输系统  

A Variable Scale Grouping Adaptive Modulation OFDM System

作　　者：余官定[1] 张朝阳[1] 仇佩亮[1] 

机构地区：[1]浙江大学信电系信息与通信工程研究所,浙江杭州310027

出　　处：《电路与系统学报》2004年第5期53-57,共5页Journal of Circuits and Systems

基　　金：国家"863"计划基金资助项目(2002AA123044);国家自然科学基金资助项目(60002003)

摘　　要：满足不同服务质量(QoS)业务是 Beyond 3G 系统必须考虑的一个问题。本文提出一种可变信道粒度的分块自适应 OFDM 系统。系统能够根据不同用户多样化的速率需求,自适应地改变分块的大小,并且在每个分块上进行自适应调制,在满足用户速率要求的基础上降低了对子载波分配信息(SAI)和自适应调制信息(AMI)的需求。仿真结果表明,本文提出的系统在系统容量和频谱效率上比固定分块自适应 OFDM 系统有更好的性能。To satisfy the QoS requirement of various type of services is one of the most concerned issues of beyond 3G wireless communication systems. A variable scale grouping adaptive modulation OFDM system is proposed in this paper. Based on the various bit rate requirement of different users, in the proposed system, the scale of subcarrier group can be changed adaptively to satisfy user’s bandwidth and QoS requirement. Besides, subcarrier allocation information (SAI) and adaptive modulation information (AMI) can be reduced. Simulation results show that improvement on system capacity and spectral efficiency can be achieved compared with fixed-size grouping modulation OFDM systems.

关 键 词：自适应调制 OFDM 信道粒度 BEYOND 3G QOS 

分 类 号：TN925.5[电子电信—通信与信息系统]