摘要
为提高无线通信系统接入用户数量和频谱效率,对转发两用户信息的非正交多址接入(NOMA)系统进行研究。在所建立模型的基础上给出两用户的选择准则,在解码转发协议(DF)协议下,研究采用选择分集接收技术时系统下行链路的中断性能;详细推导两用户精确中断概率的闭式结果和高信噪比(SNR)下的近似结果,利用近似结果得到最大分集性能。仿真分析直观给出信道质量和中继位置对系统中断概率的影响规律,并与其它方案作比较,验证了所提方案的中断性能优势。
To improve the number of access users and the spectrum efficiency of wireless communication systems,a non-orthogonal multiple access(NOMA)system for forwarding two users’information was studied.The selection criteria of two users were proposed based on the established model.Under the decode-and-forward(DF)protocol,the downlink performance of the NOMA system using selective diversity reception technology was investigated.The closed-form results of the two users’exact ou-tage performance were derived in detail.In high signal-to-noise ratio(SNR),the approximate results were also analyzed,and the maximum diversity performance was obtained based on the approximate results.The influence of channel quality and relay location on the outage probability of the system was presented intuitively through the simulation analysis.Compared with other schemes,the outage performance advantage of the proposed scheme is verified.
作者
宋传旺
刘栋
李恩玉
赵瑞收
郝思媛
SONG Chuan-wang;LIU Dong;LI En-yu;ZHAO Rui-shou;HAO Si-yuan(School of Information and Control Engineering,Qingdao University of Technology,Qingdao 266520,China)
出处
《计算机工程与设计》
北大核心
2020年第10期2729-2733,共5页
Computer Engineering and Design
基金
山东省自然科学基金项目(ZR2018MF002)
国家自然科学基金青年基金项目(61701272)。
关键词
非正交多址接入
解码转发协议
中断概率
瑞利衰落
协作通信
non-orthogonal multiple access
decode-and-forward
outage probability
Rayleigh fading
cooperative communications
