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为了解决认知无线电中,认知无线电用户(SU)如何在不干扰授权用户(PU)正常通信的情况下共享频谱资源和优化频谱使用的问题,该文在根据实际情况提出的Markov的PU信道占用模型的基础上,针对PU的行为,制定了一套合理的SU多信道接入方案。分析了SU占用信道数以及感知周期对用户有效吞吐量的影响。通过最优化有效吞吐量问题的理论推导和分析,得出了解析解。通过与仿真结果的比较,验证了理论结果的正确性,分析了曲线变化的特点,得出有效吞吐量分别随SU占用信道数以及感知周期的增加而先增大后减小的结论。
In order to solve the problem of how cognitive radio users (SUs) share spectrum resources and optimize spectrum usage without interfering with the normal communications of authorized users (PUs) in cognitive radio, this paper proposes a Markov PU channel based on the actual situation Based on the occupancy model, a set of reasonable SU multichannel access scheme is formulated for the behavior of PU. The effect of the number of SU occupied channels and the sensing period on the effective throughput of users is analyzed. Analytical solution is obtained through the theoretical derivation and analysis of the optimal effective throughput problem. Through the comparison with the simulation results, the correctness of the theoretical results is verified, the characteristics of the curve changes are analyzed, and the conclusion is drawn that the effective throughput increases and then decreases with the number of SU occupied channels and the perceptual period respectively.