標題: | A Low-Complexity CDD-based Frequency Selective Scheduling with Efficient Feedback for Downlink OFDMA Systems |
作者: | Chen, Yu-Fan Sheen, Wern-Ho Wang, Li-Chun 傳播研究所 Institute of Communication Studies |
公開日期: | 2012 |
摘要: | Cyclic-delay diversity (CDD) based frequency-selective scheduling is an effective technique to increase system capacity with low complexity. By increasing the channels' frequency selectivity with cyclic delays, the merit of multi-user diversity can be exploited more effectively in the system. This paper aims to optimize the design of the CDD-aided frequency-selective scheduling for downlink OFDMA systems. First, a low-complexity search of CD-values is proposed that results in a higher system capacity than the existing methods. Second, a new feedback method is proposed based on the principle of proportional-fair, where users who currently enjoy more downlink source are allotted less uplink resource for feedback. The method is shown to provide a better tradeoff between system capacity and fairness than the traditional methods, under a fixed feedback overhead. The effectiveness of the proposed method is verified by extensive computer simulations. |
URI: | http://hdl.handle.net/11536/20354 |
ISBN: | 978-1-4673-0990-5 |
ISSN: | 1550-2252 |
期刊: | 2012 IEEE 75TH VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING) |
顯示於類別: | 會議論文 |