摘要
针对无线信道频繁切换而导致系统性能下降的问题,在传统算法的基础上,提出了改进型信道切换算法.通过信道空闲时长的预测和比较策略,在对首要用户干扰最小的前提下,对信道进行切换控制,有效降低了信道切换代价,减小了感知开销.仿真验证表明:采用改进型信道切换算法能够有效减少信道切换次数约20%.
Frequent channel switching impairs system performance. To solve the problem, a novel algorithm is proposed to optimize channel switching on the basis of the traditional method. By predicting and comparing future idle time of different channels, this algorithm controls channel switching more effectively on the premise of minimum interference of primary users, thus reduces the cost of channel switc- hing and decreases sensing overhead. Simulation results show that application of this novel algorithm can reduce the quantity of channel switching by about 20%.
出处
《电波科学学报》
EI
CSCD
北大核心
2013年第3期524-528,534,共6页
Chinese Journal of Radio Science
基金
中央高校基本科研业务费专项资金资助
关键词
认知无线电
主动式频谱感知
感知开销
信道切换
cognitive radio
proactive spectrum sensing
sensing overhead
channel switch
