期刊名称：African Journal of Information & Communication Technology
印刷版ISSN：1449-2679
出版年度：2006
卷号：2
期号：2
页码：63-70
DOI：10.5130/ajict.v2i2.217
语种：English
出版社：University of Technology, Sydney
摘要：The paper describes an adaptive algorithm for power and bit allocations in a multiple user Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing (MIMO OFDM) system with Space Division Multiple Access, which operates in a frequency selective fading channel. The zero forcing (ZF) technique is applied to accomplish multi user detection (MUD). A Lagrange multiplier method is applied to obtain a one-step solution for optimal power and bit allocations in this system. The resulting algorithm is advantageous over an alternative Greedy algorithm, because it does not require a time-consuming iterative procedure for its implementation. The algorithm assigns bits and power for all users according to the channel state information (CSI), which is assumed to be fully or partially available to the transmitter. The simulation results show the proposed algorithm operates successfully in multiple user access scenarios.
关键词：Information and Communication Technology; ICT; computing; electronic communications; information technology systems; Telecommunications theory and systems; Computer Systems Engineering; Computer software; software development; computer science;MIMO systems; OFDM; Lagrange multiplier method; Multiuser channel; Adaptive system
