Abstract: It has been shown that cooperation can improve the performance of spectrum sensing effectively. However,Cooperation also introduces additional overheads. To deal with this problem, we proposed a pipelined spectrum sensing framework, in which secondary users conduct spectrum sensing and results reporting in a pipehned way, and the time consumed by reporting can be also utilized for sensing, resulting in an improvemented of time efficiency and a much wider observing window for spectrum sensing. Besides,we also presented a multi-threaded sectuential probability ratio test method (MhSPRh) , which is very suitable for the pipelined framework as the data fusion technique. Simulation results indicate that our pipelined sensing scheme incorporating with MhSPRh can significantly improve the performance of cooperatme spectrum sensing.

Key words: Cognitive radio, Spectrum sensing, Sequential probability ratio test