基于中继的协作频谱感知性能分析及优化

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。%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 occasion, where, SU could adaptively decide whether the relay’s cooperation was needed by its re-porting channel condition. Both analysis and simulation results show that, the better sensing performance can be achieved by the optimized BRCSS scheme compared with the traditional cooperative spectrum sensing scheme with best relay. The nearly best sensing performance can be obtained by the proposed A-BRCSS scheme.