Efficient Multiuser Water-filling Algorithm under Interference Temperature Constraints in OFDMA-based Cognitive Radio Networks

作     者：Qianxi Lu,Wei Wang,Tao Peng,Wenbo Wang Wireless Signal Processing and Network Lab,School of Telecommunications Engineering, Beijing University of Posts and Telecommunications, P.O.Box 93#,Xitucheng Road No.10,Beijing,100876,P.R.China 

会议名称：《IEEE 2007 International Symposium on Microwave,Antenna,Propagation and EMC Technologies for Wireless Communications(ISMAPE-2007)》

会议日期：2007年

学科分类：080904[工学-电磁场与微波技术] 0810[工学-信息与通信工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 

基　　金：supported by Nokia and the National Natural Science Foundation of China under Grant No.60572120 

摘      要：Cognitive radio makes it possible for an unlicensed user to access a spectrum unoccupied by licensed *** subcarrier and power allocation algorithm in CR networks is a challenging problem,especially for *** this paper,an efficient multiuser water-filling algorithm is proposed under the interference temperature *** this algorithm,subcarriers are allocated to the users with the best channel quality initially and then adjusted to improve the system *** is shown in the simulation results,the proposed algorithm has a much lower computational complexity and the performance is close to optimal ***,it is proved that there is an upper bound of the throughput loss by using this algorithm.