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论文类型：会议论文

发表时间：2014-05-18

收录刊物：EI、CPCI-S、Scopus

卷号：2015-January

期号：January

关键字：Cooperative Relaying; Cognitive Radio; System Throughput; Outage Probability

摘要：This paper investigates the cooperative transmission in the downlink of a large-coverage secondary system which opportunistically accesses the licensed spectrum of some small-coverage primary systems scattered inside. We propose a cognitive-relay-based selection cooperation protocol under which cognitive relays help forward information in an opportunistic fashion by acquiring spectrum holes. We also present two cognitive relay selection strategies and analyze the performance in terms of the outage probability and the system throughput. Compared to the optimal instantaneous channel state information (ICSI) based strategy, the partial CSI (PCSI) based one can provide a close-to-optimal performance with no additional channel estimation. Simulation results indicate that the scenario where relays have to opportunistically access spectrum holes incurs a cooperative diversity order penalty, and the performance advantage of our proposed protocol depends on conditions of spectrum acquisition and spectrum quality of cognitive relays.