离散比特多播OFDM系统自适应资源分配算法  

Adaptive Resource Allocation Algorithms for Multicast OFDM System with Discrete Bits

作　　者：孙群龙[1] 卫国[1] 

机构地区：[1]中国科学技术大学无线网络通信安徽省重点实验室,安徽合肥230027

出　　处：《小型微型计算机系统》2010年第5期879-882,共4页Journal of Chinese Computer Systems

基　　金：国家"九七三"重点基础研究发展计划基金项目(2007CB310602)资助

摘　　要：考虑具有多个多播组的OFDM系统中的资源分配问题,在保证各多播业务误比特率要求下,最大化系统频谱效率.针对实际系统中调制阶数为离散值的情况,首先将连续比特资源分配算法扩展到离散比特的情况,系统性能损失较大.为提高系统性能,提出一种基于多描述编码的离散比特资源分配算法,利用多描述编码灵活的解码特性,更有效地进行资源分配.仿真结果表明,所提基于多描述编码的离散比特资源分配算法,在不同多播组数目和每组用户数情况下,均可改善系统性能.Adaptive resource allocation for multicast OFDM system is studied in this paper. The objective is to maximize the spectrum efficiency while guaranteeing the BER requirement of each multicast service. Considering the discrete modulation orders in practical systems,we first extend the resource allocation algorithm with continuous bits to discrete bit cases,which results in performance loss. To improve the system performance,a multiple description coding based resource allocation algorithm is proposed. The decoding flexibility of multiple description coding is well exploited,and the resource allocation is performed more effectively. Simulation results show that the proposed algorithm can improve the system performance under different scenarios.

关 键 词：正交频分复用 多播 多描述编码 离散比特 

分 类 号：TP393[自动化与计算机技术—计算机应用技术]