关键词: 认知无线电, 混合泊松分布, 参数估计, 最大期望算法, 动态信道分配

Abstract: According to the characteristics of primary users’ service, this paper applied mixed Poisson distribution to primary users’ service modeling, evaluating the probability density of non-occupied duration of channel by using Expectation-Maximization (EM) algorithm to estimate the parameters of mixed Poisson distribution model and putting forward a multi-channel allocation algorithm based on channel estimation. The simulation results indicate that the proposed algorithm has excellent performance on conflict rate and throughput. Meanwhile, the proposed algorithm has lower implementation complexity for practical use.

Key words: cognitive radio, mixed Poisson distribution, parameter estimation, Expectation-Maximization (EM) algorithm, dynamic channel allocation