A POMDP-based optimal spectrum sensing and access scheme for cognitive radio networks with hardware limitation

作者：Wu Lingcen^*; Wang Wei; Zhang Zhaoyang

来源：2012 IEEE Wireless Communications and Networking Conference, WCNC 2012, 2012-04-01 to 2012-04-04.

DOI：10.1109/WCNC.2012.6213975

• Access schemes
• Cognitive radio network
• Optimal scheme
• Partially observable Markov decision process
• Reward function
• Service requirements
• Spectrum Aggregation
• Spectrum sensing

In cognitive radio networks, multiple discontinuous spectrum opportunities are detected by spectrum sensing and utilized together to satisfy the service requirement by spectrum aggregation. In this paper, we develop an analytical framework for joint spectrum sensing and access scheme based on Partially Observable Markov Decision Process (POMDP). Considering the hardware limitations, the spectrum aggregation range is restricted and only a part of channels can be sensed. For obtaining the reward function of POMDP, the channel switch probability is estimated by theoretic deduction. Under this POMDP framework, an optimal spectrum sensing and access scheme is proposed to minimize the channel switch times. Simulation results show that our proposed optimal scheme reduces the times of channel switches significantly.

• 出版日期2012
• 单位浙江大学