Yang J.,PLA University of Science and Technology |
Zhao H.,The 63rd Institute of PLA General Staff |
Chen X.,Nanjing University of Science and Technology |
Liu Y.,The 63rd Institute of PLA General Staff |
Zong R.,Shenyang Institute of Engineering
Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and Technology (Natural Science Edition) | Year: 2015
An energy efficient secondary user was designed based on the spectrum prediction. The frame structure of the secondary user was redesigned, and the prediction slot was added before the sensing slot to select channel for sensing only from the channels predicted to be idle. Consequently, the sensing energy is saved and the energy efficiency is improved compared to the traditional secondary user. It is further found that the energy efficiency is determined by prediction energy, prediction duration, traffic intensity and the number of channels in cognitive radio networks(CRN). Simulation results show that to improve energy efficiency, prediction energy should be controlled less than 32 mW and prediction duration should be cut shorter than 15ms. Furthermore, increasing traffic intensity and channel amount of the cognitive radio networks improves the energy efficiency of secondary user. ©, 2015, University of Science and Technology. All right reserved.
Zhang J.,The 63rd Institute of PLA General Staff |
Chen Y.,The 63rd Institute of PLA General Staff |
Liu C.,PLA University of Science and Technology |
Wu H.,The 63rd Institute of PLA General Staff |
Shao Z.,The 63rd Institute of PLA General Staff
Jiefangjun Ligong Daxue Xuebao/Journal of PLA University of Science and Technology (Natural Science Edition) | Year: 2014
To meet the requirement of acquiring spectrum information quickly from the networks under dynamic spectrum management (DSM) system, a spectrum map based DSM framework was proposed. The framework is composed of regional spectrum management center (RSMC), dynamic spectrum access network and spectrum users, in which RSMC is responsible for constructing and distributing spectrum map to provide spectrum map information service as well as to execute network management and real-time spectrum coordination. For the demand of obtaining spectrum map quickly with low overhead, three spectrum map distribution strategies were proposed, including periodic distribution, on-demand distribution, and real-time distribution on updating. A hardware in loop simulation system was developed based on the universal software radio platform to evaluate the proposed framework. Simulation results demonstrate that networks under the proposed framework can make better use of the spectrum and the system performances on throughput, and that delay and queue length are improved markedly. ©, 2014, University of Science and Technology. All right reserved.