一种结合信道性能的频谱分配算法

在认知无线电网络中，由于授权信道的时变性，各可用信道的性能相差较大。为避免过多使用忙闲交替频繁的信道，首先用ON—OFF模型建模授权信道的使用情况，并推导了认知用户切换概率，提出了一种用信道状态变化率衡量信道性能的方法。在此基础上提出了一种结合信道性能的频谱分配算法，在网络吞吐量相同或相近情况下优先分配性能较好的信道。仿真分析表明，这种结合信道性能的频谱分配算法在降低切换概率的同时提高了实际总效益。

Spectrum Allocation Algorithm Based on Channel Performance

Due to the time-varying characteristics of authorized channels, the performance of each available channel varies widely in cognitive radio network. To avoid excessive use of fast changing channels, an usage model using ON-OFF model is constructed and the handoff probability of secondary user is derived. And then, a measurement using the changing rate of channel state is presented. On this basis, a spectrum allocation algorithm combined with channel performance is proposed. It allows priority in allocation of channel with better channel performance in the case of same or similar network throughput. Simulation analysis shows that the handoff probability is reduced and actual total benefit is improved by using such algorithm.