The Optimal Spectrum Sensing Stopping Rules Considering Power Limitation in Cognitive Radio

摘要

In order to improve the utilization of spectrum resources, secondary users sensing channels based on the behavior characteristics of the primary user, and then opportunistically access channels for transmission. However, in practical work environment, there is a limitation on the transmission power of secondary users. This paper proposes an optimal stopping rule that considers the transmission power limitation of secondary users, dynamically determines the number of channels sensed by secondary users in each time slot, and timely stops the sensing process, thereby improving the throughput achieved by secondary users. The simulation results show that the optimal sensing stop rules proposed by us can evidently improve the throughput of secondary users , and it is close to the upper bound of the throughput that secondary users can achieve under the most ideal conditions.