Simultaneous Sensing, Transmission and Energy Harvesting:Full-duplex in RF-powered Cognitive Radio Networks
Spectrum efficiency(SE)and energy efficiency(EE)are two key targets in wireless communication networks.Applying energy harvesting technology to cognitive radio networks(CRNs),which is called RF-powered CRNs,provides an effective method to improve both SE and EE of CRNs.In conventional RF-powered CRNs,secondary transmitters(STs)equipped with RF energy harvesting capability opportunistically access the spectrum when primary transmitter(PT)is idle; otherwise,RF energy from PT are harvested.In this paper,we propose a novel simultaneous sensing,transmission and harvesting(SSTH) scheme by applying full-duplex(FD)technique to RF-powered CRNs.We define EE as the ratio of STs throughput to average consumed power and the harvesting efficiency(HE)as the ratio of average harvested energy to average consumed energy.The EE and HE are analyzed for the proposed scheme.It is shown that the increase of STs transmit power does not always lead to improvement of STs EE and HE due to the existence of self-interference,i.e.there exists a tradeoff between EE and STs transmit power.For the tradeoff,we derive the optimal transmit power to achieve maximal EE.Besides,we investigate the optimization of HE and consider three cases to maximize the HE.Furthermore,joint optimization of EE and HE is discussed.Simulation results are given to verify the proposed scheme and the theoretical analyses.
cognitive radio networks full-duplex RF energy harvesting energy efficiency harvesting efficiency
Menglan Fan Hang Zhang Hang Hu Qian Wang Jiong Li
College of Communications Engineering,PLA University of Science and Technology,Nanjing,210007,China Information and Navigation College,Air Force Engineering University,Xian,710000,China Xichang Satellite Launch Center,Sichuan,615000,China
国际会议
重庆
英文
955-960
2017-03-25（万方平台首次上网日期，不代表论文的发表时间）