BLOCK ADAPTIVE SUBCARRIER ALLOCATION FOR WIRELESS MULTIUSER OFDM SYSTEM  

作　　者：LiangXiaowen ZhuJinkang 

机构地区：[1]PCN＆SSLab,DeptofElectronicsEngineeringandInformationScience,UniversityofScienceandTechnologyofChina,Hefei230027

出　　处：《Journal of Electronics(China)》2004年第6期454-460,共7页电子科学学刊（英文版）

基　　金：Supported by the National 863 High-Tech Program of China (No.2001AA121031);the National Natural Science Foundation of China (GG065760242003)

摘　　要：In this paper, a blockwise adaptive subcarrier allocation algorithm for multiuser Orthogonal Frequency Division Multiplexing (OFDM) system is introduced. Assuming the knowledge of channel information for all users, the algorithm minimizes the total transmit power while satisfying the total power and users' rate constraints. The result of simulation shows that the proposed algorithm reduces the average bit Signal-to-Noise Ratio (SNR) by approximately 4 dB compared with OFDM-Frequency Division Multiple Access (OFDM-FDMA), and supports more users in a multiuser Rayleigh fading channel. As assigning subcarriers in block, the computational complexity of the algorithm is much lower than that of the derivation of "water-filling" algorithm.In this paper, a blockwise adaptive subcarrier allocation algorithm for multiuser Orthogonal Frequency Division Multiplexing(OFDM) system is introduced. Assuming the knowledge of channel information for all users, the algorithm minimizes the total transmit power while satisfying the total power and users' rate constraints. The result of simulation shows that the proposed algorithm reduces the average bit Signal-to-Noise Ratio(SNR) by approximately 4 dB compared with OFDM-Frequency Division Multiple Access(OFDM-FDMA), and supports more users in a multiuser Rayleigh fading channel. As assigning subcarriers in block, the computational complexity of the algorithm is much lower than that of the derivation of 'water-filling' algorithm.

关 键 词：Orthogonal Frequency Division Multiplexing(OFDM) MULTIUSER Subcarrier allocation Rayleigh fading channel 

分 类 号：TN914.5[电子电信—通信与信息系统] TN915[电子电信—信息与通信工程]