频谱切换中基于频谱感知的链路保持概率

摘要

To analyze the effect of the spectrum sensing on the communication performance of cognitive users,study the key facts in spectrum handoff,the link maintenance probability and average transfer time of cognitive users in spectrum handoff was researched From the deduction, the data transmission probability which cognitive users could transmit all data in the communication and the effective data rate were obtained Simulation results showed that, comparing this model with the non-spectrum handoff and the pre-determined channel list spectrum handoff, the performance of handoff based on spectrum sensing was more stable than the others in different environments,especially when the arrival rate of the primary users was high. Whafs more, simulation results also showed that the erroneous channel selection probabilities and spectrum sensing time were the two key reasons that affecting the spectrum handoff.%为分析频谱感知对认知用户通信性能的影响,定量研究频谱切换中认知用户的相关参数,推导了频谱切换中基于频谱感知的链路保持概率及平均传输时间.得到认知用户在一次通信中能完成数据传输的概率和通信中的有效数据传输速率.仿真分析表明:在不同频谱环境下,基于频谱感知的频谱切换性能要比非频谱切换和基于频谱感知的信道预测方案的性能稳定,尤其是当授权用户到达率较高时更明显.此外,仿真数据表明:频谱感知中的错误信道选择概率和感知时间是影响频谱切换性能的两大重要因素.