Optimization of MAC-layer Multi-user Cooperative Spectrum Sensing Mechanism in Cognitive Radio
Ling Wang, Peng Qi-cong · Signal Processing · 2011
Aimed at efficient and fast searching of spectrum opportunities,while avoiding interference to primary users,spectrum sensing play a significant role in cognitive radio system.Generally,multi-user cooperative sensing can enhance the performance of system.Hence,this paper is focus on the characteristics of two kinds of sensing mechanism such as proactive and reactive sensing policy in a multi-user cooperation situation,and analyzes the sensing performance over the activity level of primary users.We proposed a optimization strategy of making a tradeoff between access delay and sensing overhead.Through the theory analysis and simulation,multiuser cooperative sensing in proactive and reactive mechanisms also reduce the channel searching interval.