基于中继的协作频谱感知性能分析及优化.pdfVIP

第34 卷第9 期 通 信 学 报 Vol.34 No. 9 2013 年9 月 Journal on Communications September 2013 doi:10.3969/j.issn. 1000-436x.2013.09.005 基于中继的协作频谱感知性能分析及优化 李美玲 (太原科技大学 电子信息工程学院，山西 太原 030024) 摘 要：提出了一种基于目标的中继协作频谱感知方案，证明了 SU 到 SR 链路上的信道条件对系统性能有较大 的影响；鉴于此，提出了一种优化的最佳中继协作频谱感知(optimized BRCSS)方案，通过联合考虑目标SU 到SR 链路上的信道条件和 SR 到FC 链路上的信道条件选择最佳认知中继；最后，从更实际的应用场景考虑，为了节 约系统开销，进一步提出了一种自适应的最佳中继协作频谱感知方案（A-BRCSS ），即 SU 根据其信道条件，自 适应地选择是否需要认知中继的协作传输。分析和仿真结果均表明，相比传统最佳中继协作频谱感知方案， Optimized BRCSS 方案可以实现更高的感知性能；所提A-BRCSS 方案可以实现几乎最佳的感知性能。 关键词：认知无线电；协作频谱感知；最佳中继；检测性能；自适应 中图分类号：TN92 文献标识码：A 文章编号：1000-436X(2013)09-0033-08 Performance analysis and optimization of cooperative spectrum sensing with relay LI Mei-ling (School of Electronics and Information Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China) Abstract ：An object based cooperative spectrum sensing scheme with relay was proposed, and the fact that the channel condition from SU to SR has an important influence to system performance was proved. In view of this, an optimized cooperative spectrum sensing scheme with best relay(optimized BRCSS) was proposed, in which the best secondary relay was selected by considering both the channel condition from SU to SR and SR to FC. Finally, an adaptive cooperative spectrum sensing scheme with best relay (A-BRCSS) was proposed further to save the system expense considering more practical application occasi