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 |