標題: A GA-Based Optimization for Frequency-Selective Scheduling in Downlink OFDMA Systems with Cyclic-Delay Diversity
作者: Chen, Yu-Fan
Sheen, Wern-Ho
傳播研究所
Institute of Communication Studies
關鍵字: OFDMA;Cyclic Delay Diversity (CDD);Frequency-selective scheduling
公開日期: 2012
摘要: CDD (cyclic-delay diversity) aided frequency-selective scheduling has been known as an effective technique to increase system capacity of the OFDMA (orthogonal frequency-division multiple access) systems. By increasing the channels' frequency selectivity with cyclic delays, the merit of multi-user diversity can be exploited more effectively in the system. In this paper, we aim to optimize the design of the CDD-aided frequency-selective scheduling for downlink OFDMA systems. A genetic algorithm (GA)-based optimization is devised to obtain the cyclic-delay values which provides a higher system sum-rate than the multi-degree adaptive cyclic-delay diversity method and has a lower computational complexity than the exhaustive method with only a slight degradation in system sum-rate. The effectiveness of the proposed method is verified by extensive computer simulations.
URI: http://hdl.handle.net/11536/22884
ISBN: 978-1-4673-0437-5
ISSN: 1525-3511
期刊: 2012 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC)
起始頁: 1257
結束頁: 1262
顯示於類別:會議論文