一种次用户随机接入新模型及系统

A new model and system for secondary users random access

为解决非理想感知条件下无线通信系统的冲突概率及频谱利用率问题,利用连续时间的马尔可夫链,构建了一个面向多信道、多用户、非确定状态的概率模型.仿真结果表明:在虚警概率Pf1=0.1,Pf2=0.15,总信道数M=10的条件下,当系统的信噪比由-10 dB增加到10 dB,次用户到达强度由0.5增加到5时,冲突概率由0.9降为0.6,频谱利用率由0.27提高到1.00,说明本文方法能有效提高频谱资源利用率,克服了现有方法的不足.

In order to solve the problem of collision probability and spectrum utilization of wireless communication system under non-ideal perception condition,a probabilistic model for multi-channel,multi-user and non-deterministic state is constructed by continuous time Markov chain.Simulation results show that under the conditions of false alarm probability Pf1=0.1,Pf2=0.15,and the total number of channels M=10,when the signal-to-noise ratio of the system increases from-10 dB to 10 dB,and the intensity of arrival of the second user increases from 0.5 to 5,the conflict probability decreases from 0.9 to 0.6,and the spectrum utilization increases from 0.27 to 1.00.The results show that this method can effectively improve the utilization of spectrum resources and overcome the shortcomings of existing methods.