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In this paper, a multi-slot spectrum sensing and transfer scheme inmultichannel CR is proposed by dividing the sensing stage into several time slots that are allocated to the subchannels for spectrum sensing. We formulate an optimization problem that maximizes the SU's aggregate throughput by jointly allocating the optimal number of sensing time slots and transfer power to each subchannel. The simulation...
In cognitive radio (CR), energy detection is a simple and feasible method to get reliable detection results on the presence of primary user (PU) in perfect channel. In imperfect channel, single-threshold cooperative spectrum detection has been proposed to improve energy detection performance, however it is sensitive to noise interference. In order to solve this problem, double-threshold cooperative...
Power control of secondary user is an important issue for cognitive radio systems to protect the transmission of primary users. There are several ways to protect the primary user under the accurate estimation of the channels. In this paper, we focus on the protection of primary user under the imperfect channel estimation. We first gives the mathematical expressions of the outage probability of the...
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