多业务多用户OFDM系统中的资源快速分配方案  

A feasible resource allocation scheme for multi-user OFDM systems with various services

作　　者：孙治水[1] 尹长川[1] 乐光新[1] 

机构地区：[1]北京邮电大学数字通信与信息网络实验室,北京100876

出　　处：《电路与系统学报》2008年第5期13-17,共5页Journal of Circuits and Systems

基　　金：国家"863"计划项目资助(2007AA10Z235);国家自然科学基金资助项目(60472070);国家科技攻关计划重大项目资助(2003BA808A16);广州市基础科研基金项目资助(2006J1-C0331)

摘　　要：本文提出了多用户OFDM系统下行链路中的一种快速实用的资源分配算法。该算法以最大化系统吞吐量为目的,同时满足CBR(固定速率)和VBR(可变速率)用户的QoS(服务质量)要求。算法使用分组代替迭代计算,摒弃复杂的子载波交换操作,以极低的复杂度实现了等功率下的自适应子载波分配和比特加载。本文在选择性衰落信道下对算法进行评估,并与[6]中的算法比较。仿真表明,该算法可以在更低的复杂度O(KNlogN+2KN)下实现与[6]同样的吞吐量。In this paper, we transmission. The proposed propose a feasible resource allocation scheme for multi-user OFDM systems in downlink method is featured as a low-complexity algorithm which is designed to improve the system throughput while guaranteeing QoS requirements for both the CBR and VBR services. The algorithm, which involves adaptive sub-carrier allocation and bit loading with equally power allocation, adopts a grouping technique rather than the sub-carrier swapping. The performance of the proposed resource allocation algorithm is evaluated in a frequency-selective fading channel, and compared with that of the resource allocation algorithm in [6]. Numerical results show that the proposed algorithm provides the same throughput while reducing the complexity to a feasible case.

关 键 词：OFDMA 多用户 子载波分配 比特加载 多业务 自适应 

分 类 号：TN911[电子电信—通信与信息系统]