Power Allocation for Cooperative Communications in Non-Orthogonal Cognitive Radio Vehicular Ad-Hoc Networks  

作　　者：Yancheng Ji Dan Sun Xiaojun Zhu Danfeng Dong 

机构地区：[1]School of Information Science and Technology,Nantong University,Nantong 220619,China

出　　处：《China Communications》2020年第11期91-99,共9页中国通信（英文版）

基　　金：funded by the Six Talent Peaks Project in Jiangsu Province(No.KTHY-052);the National Natural Science Foundation of China(No.61971245);the Science and Technology program of Nantong(Contract No.JC2018048);the Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China,Soochow University(No.KJS1858).

摘　　要：To achieve the better system performance for cooperative communication in non-orthogonal cognitive radio vehicular adhoc networks(CR-VANETs),this paper investigates the power allocation considering the interference to the main system in a controllable range.We propose a three-slot one-way vehicle system model where the mobile vehicle nodes complete information interaction with the assistance of other independent nodes by borrowing the unused radio spectrum with the primary networks.The end-to-end SNR relationship in overlay and underlay cognitive communication system mode are analyzed by using two forwarding protocol,namely,decode-and-forward(DF)protocol and amplify-and-forward(AF)protocol,respectively.The system outage probability is derived and the optimal power allocation factor is obtained via seeking the minimum value of the approximation of system outage probability.The analytical results have been confirmed by means of Monte Carlo simulations.Simulation results show that the proposed system performance in terms of outage under the optimal power allocation is superior to that under the average power allocation,and is also better than that under other power allocation systems.

关 键 词：DECODE-AND-FORWARD AMPLIFY-AND-FORWARD outage probability optimal power allocation cooperative communication cognitive radio vehicular ad-hoc networks 

分 类 号：TN925[电子电信—通信与信息系统]