CR-OFDM系统中的一种新的动态频谱分配算法  

A Novel Dynamic Resource Allocation Algorithm for CR-OFDM System

作　　者：王航[1] 

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003

出　　处：《南京邮电大学学报（自然科学版）》2012年第4期23-27,共5页Journal of Nanjing University of Posts and Telecommunications：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)(2009AA01Z241)资助项目

摘　　要：文中基于对认知无线电技术以及OFDM系统传输特性的分析,提出了一种CR-OFDM系统中多用户资源分配新算法。该算法首先根据认知用户的QoS需求为其分配子载波,在保证不干扰授权用户正常通信的前提下,再利用改进的注水算法为每个认知用户分配功率,使得整个系统的信道容量最大化。仿真结果表明该算法能在保证误比特率和用户公平性的前提下显著提高频谱利用率。In this paper,a novel multi-user resource allocation algorithm for CR-OFDM system is proposed,based on the performance analysis of the cognitive radio techniques and the transmission characters of orthogonal frequency division multiplexing（OFDM） system.The sub-carriers are allocated to the cognitive users according to their quality of service（QoS）.The power is distributed for each cognitive user with improved water-filling algorithm on the premise that the interference to the primary users is avoided.The method can maximize the channel capacity.The results show that this algorithm can obtain higher spectrum efficiency,considering the bit error rate and the fairness of the cognitive users simultaneously.

关 键 词：认知无线电 OFDM 注水算法 资源分配 比例公平 

分 类 号：TN929.537[电子电信—通信与信息系统]