放大转发OFDM协同中继系统多业务资源分配机制  

Resource allocation schemes in amplify-and-forward OFDM cooperative relay systems with multimedia traffic

作　　者：陈书平[1] 王文博[1] 张兴[1] 付雷[1] 

机构地区：[1]北京邮电大学泛网无线通信教育部重点实验室,北京100876

出　　处：《通信学报》2010年第4期116-121,共6页Journal on Communications

基　　金：北京邮电大学优秀博士生创新基金资助项目(CX200903);国家重点基础研究发展计划("973"计划)基金资助项目(2007CB310602)~~

摘　　要：提出了点到点多载波协同中继系统多业务资源分配框架,并给出了一种最优化自适应功率、载波和比特分配算法;为了降低算法复杂度,又提出了一种次优搜索算法,该算法依据信道特性,在满足业务QoS基础上使业务占用资源最小。仿真结果表明:提出的最优算法在保障多媒体业务QoS的基础上能够有效改善频谱效率,对比于传统算法有1～2bit/(s.Hz)的性能提升;而提出的次优搜索能够取得接近最优算法的性能(差别在0.6bit/(s.Hz)左右),并且实现复杂度由指数级别降至线性。A framework of resource allocation for multimedia traffic in point-to-point OFDM （orthogonal frequency divi- sion multiplexing） cooperative relay systems was presented, an optimal adaptive power, carrier and bit allocation scheme was proposed. A sub-optimal fast-searching algorithm was proposed for practical implementation, which allocated the minimum resource to each service according to the channel conditions. Simulation results show that this scheme can meet the QoS （quality of service） requirement of the multimedia traffic while improve the spectral efficiency significantly. Moreover, performance of the sub-optimal search algorithm in terms of throughput is close to optimal scheme by 0.6bit/（s-Hz） at all SNR regime, with reduced complexity in linear polynomial level rather than O（3N）.

关 键 词：协同中继通信 OFDM 多媒体业务 资源分配 

分 类 号：TN911.22[电子电信—通信与信息系统]