Performance Analysis of Relay Based NOMA Cooperative Transmission under Cognitive Radio Network  

作　　者：Yinghua Zhang Jian Liu Yunfeng Peng Yanfang Dong Guozhong Sun Hao Huang Changming Zhao 

机构地区：[1]School of Computer and Communication Engineering,University of Science and Technology Beijing,Beijing,100083,China [2]Dawning Information Industry(Beijing)Co.,Ltd.,Beijing,100083,China [3]Higon Austin R&D Center,Austin,TX 78746,USA [4]School of Computer Science,Chengdu University of Information Technology,Chengdu,610225,China [5]College of Computer Science,Sichuan University,Chengdu,610041,China

出　　处：《Computers, Materials & Continua》2020年第4期197-212,共16页计算机、材料和连续体（英文）

基　　金：This work is supported by National Major Project(No.2017ZX03001021-005);National Key R&D Program of China(Grant No.2017YFB1001600);2018 Sugon Intelligent-Factory on Advanced Computing Devices(No.MIIT2018-265-137).

摘　　要：This paper proposes a hybrid spectrum accessing mechanism by using NOMA-based cooperative transmission and beam-forming technology.In this mechanism,the secondary user employs spectrum-sensing technology to detect the existence of the primary user.If the primary user does not exist,the secondary source user directly transmits data to the destination user.If the primary user exists,the secondary source user finds the optimal relay according to certain selection principle before transmitting data to the destination user through the chosen relay node.For the signal receiving stage,the secondary user takes use of beam-forming technology to receive the signal from both the secondary source and the secondary relay node.Meanwhile the interference from the primary user is cancelled out in the stage.Furthermore,the outage probability for secondary user in the proposed mechanism is theoretically derived.Finally,the simulation results show that compared with the traditional mechanism,the proposed system model can not only guarantee the continuity of secondary transmission,but also significantly reduce the outage probability of secondary transmission.

关 键 词：Relay selection outage probability NOMA QoS signal-to-interference-plus-noise rate(SINR) BEAM-FORMING 

分 类 号：TN9[电子电信—信息与通信工程]