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在具有时隙模式信道的认知无线电(CR)网络中,为使认知用户尽快找到可用信道,基于频率维相关性的预测,提出了一种表征1组信道可用性信息的全新概念,即信道可用性矢量(CAV);并将如何使认知用户在最短时间内找到可用信道的问题规划成马尔可夫决策过程(MDP),从而找到根据当前信道可用性矢量的最佳频谱探测策略.通过在广东省实际测量得到的频谱占用性数据,验证了该方法相比简单的随机频谱探测及顺序频谱探测能使认知用户更快地找到可用信道,不失为低速率业务应用在高占用度频谱中的一种较好解决方案.
In Cognitive Radio (CR) networks with slotted-mode channels, in order to enable cognitive users to find available channels as soon as possible, a new concept of channel availability information is proposed based on the prediction of frequency-dimensional correlation. That is, channel (CAV), and how to make the cognitive user find the available channel in the shortest time is programmed into the Markov Decision Process (MDP) to find the best spectrum detection strategy based on the current channel availability vector.Finally, The results show that compared with the simple random spectrum detection and sequential spectrum detection, this method can make the cognitive user find the available channel more quickly, which is one of the low-rate service applications in the spectrum of high occupancy A better solution.