| Cognitive radio technology is proposed to solve the problem of low spectrum utilization.Spectrum sensing technology is the key link of cognitive radio.High-performance spectrum sensing method is significant for cognitive radio network.In addition,the energy problem also limits the development of wireless communication technology.How to improve the spectrum efficiency and energy efficiency of communication system simultaneously is the challenge of wireless communication technology.Therefore,this paper focuses on the high-performance spectrum sensing under malicious interference and the resource allocation in cognitive radio scene based on energy collection technology.The main work of this paper is as follows:1)The presence of malicious interferences in cognitive radio networks can severely degrade the performance of spectrum sensing.In this paper,we propose a cooperative spectrum sensing approach to tackle malicious interferences,where the local signal to interference plus noise power ratios at secondary users are transmitted to a fusion center for making decision.The theoretical performance of the proposed detector,in terms of false-alarm and detection probabilities,is analyzed,and simulation results are provided to validate the theoretical analyses and demonstrate the superior performance of the detector.2)This article deals with resource allocation to maximize the secondary user throughput in cognitive radio where primary user are wirelessly powered by secondary user signals during the first part of a time-slot,and primary user and secondary user share the spectrum during the second part of the time-slot.An optimization problem is formulated to maximize secondary user throughput under a constraint of minimum primary user throughput.A three-step resource allocation scheme is proposed to solve the optimization problem with low complexity.Numerical simulations are provided to demonstrate the superiority of the proposed scheme in terms of both performance and computational complexity. |
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