基于时间估计的动态频谱接入算法

基于先验知识模型,设计了基于信道剩余空闲时间估计的动态频谱接入算法：每个次用户根据感知历史维护信道剩余空闲时间的估计向量并周期进行更新,每个时隙开始时次用户选择剩余空闲时间估计最大的信道接入。对动态频谱接入算法的适应性问题进行了分析,并求得了次用户的最优传输时间长度。仿真结果表明,在给定的参数下,新算法的信道利用率比其他算法提高约5%-10%,同时对主用户的干扰保持最低。

Dynamic spectrum access algorithm based on the estimation of channel time

Based on the anterior knowledge model,a Dynamic Spectrum Access（DSA） algorithm was proposed according to the Channel Remaining Idle Time（CRIT） estimation.Each Secondary User（SU） maintained an estimation vector of the CRIT and upgraded it periodically.At the beginning of each time slot,SU chose a channel with the largest CRIT estimation to access.The adaptability of the DSA algorithm was analyzed and the optimal transmission time for the SU was obtained.Simulation results show that the new algorithm has 5%-10% higher channel utilization efficiency than other ones under certain channel parameters while making the lowest interference to Primary Users（PU）.