关键词: 认知无线电, 频谱感知, 吞吐量, 半马尔科夫链

Abstract: In order to maximize the throughput of secondary user in cognitive radio network, while the interference to primary user under the predefined threshold, a new channel sensing and access algorithm based on Partially Observable Markov Decision Process（POMDP） is proposed in this paper. The primary channel has been divided into several slots equally in time domain. At beginning of each slot, the secondary user selects an optimal strategy from three actions：spectrum sensing, access the channel with a larger power and access the channel with a low power. It formulates the selection of secondary users as a POMDP problem, some optimal strategies are proposed to solve the problem. Illustrative results indicate the efficiency of the proposed algorithm.

Key words: cognitive radio, spectrum sensing, throughput, Partially Observable Markov Decision Process（POMDP）