Optimal Sensing Time Strategy Under Primary Outage Constraint in Cognitive Radio Networks  

作　　者：LIU Xinyi LI Jiandong JIANG Jian 

机构地区：[1]School of Information Engineering, Chang'an University, Xi'an 710071, China [2]State Key Laboratory of Integrated Service Networks, Xidian University, Xi'an 710071, China [3]China Academy of Telecommunication Research of MIIT, Beijing 100191, China

出　　处：《Chinese Journal of Electronics》2016年第5期907-911,共5页电子学报（英文版）

基　　金：supported by the Fundamental Research Funds for the Central Universities(No.310824161008);the National Natural Science Foundation of China(No.61231008,No.61101143);the Program for Changjiang Scholars and Innovative Research Team in University(No.IRT0852);the 111 Project(No.B08038)

摘　　要：With the underlay approach, Secondary users(SUs) can utilize the same frequency bands simultaneously with Primary users(PUs) in Cognitive radio networks(CRNs). How to choose the appropriate transmission power of SUs under the influence caused by other cells is a problem. To solve this problem, spectrum sensing is introduced to identify the existence of interference which using pilot signal to perform coherent processing. Consider the probability of detection of SUs, there exists a trade-off between the sensing time and the achievable throughput of CRNs. When the prior probability of other cells' activity is unknown to SUs, throughput of the CRNs can be viewed as a concave function. According to solving the optimization problem, the optimal sensing time is obtained.Simulation results show the feasibility and correctness.With the underlay approach, Secondary users（SUs） can utilize the same frequency bands simultaneously with Primary users（PUs） in Cognitive radio networks（CRNs）. How to choose the appropriate transmission power of SUs under the influence caused by other cells is a problem. To solve this problem, spectrum sensing is introduced to identify the existence of interference which using pilot signal to perform coherent processing. Consider the probability of detection of SUs, there exists a trade-off between the sensing time and the achievable throughput of CRNs. When the prior probability of other cells＇ activity is unknown to SUs, throughput of the CRNs can be viewed as a concave function. According to solving the optimization problem, the optimal sensing time is obtained.Simulation results show the feasibility and correctness.

关 键 词：CRNs Underlay approach Inter-cell interference Sensing-throughput tradeoff 

分 类 号：TN925[电子电信—通信与信息系统]