摘要
针对基于中继辅助传输的认知无线电-非正交多址(CR-NOMA)系统中,频谱利用率低及安全性较差的缺点,提出将大规模多输入多输出(MIMO)技术应用到基于双向中继的CR-NOMA网络中,使两组认知非正交多址(NOMA)用户在双向中继的协助下交换信息.在不完全信道状态信息的约束下,推导出受发射功率、信道估计误差和天线数量影响的安全中断概率的闭合表达式.仿真结果表明,随着中继天线数量的增加,安全中断概率收敛到特定数值,同时可得到复杂度较低且安全性能最优天线数量.
In view of the disadvantages of low spectrum utilization and poor security in existing relay-assisted cognitive radio-non-orthogonal multiple access(CR-NOMA)systems,it is proposed that applying massive multiple-input multiple-output(MIMO)technology to CR-NOMA system with two-way relay(TWR),where two groups of cognitive non-orthogonal multiple access(NOMA)users exchange massages with the aid of two-way relay.The close expression of security outage probability is derived with the constraint of imperfect channel state information,which is mainly affected by transmit power,channel estimation error and the number of antennas at the TWR.The simulation results show that with the increase of the number of relay antennas,the probability of security interruption converges to a specific value,and the optimal number of antennas with low complexity and best security performance can be obtained.
作者
席琳
冉静学
XI Lin;RAN Jing-xue(Information Construction Management Division,MinZu University of China,Beijing 100081,China)
出处
《东北师大学报（自然科学版）》
CAS
北大核心
2023年第2期62-67,共6页
Journal of Northeast Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(U1906234)
山东省联合基金重点支持项目(U1906234)。
关键词
安全中断概率
大规模多输入多输出
非正交多址
双向中继
不完全信道状态信息
security outage probability
massive multiple-input multiple-output
non-orthogonal multiple access
two-way relay
imperfect channel state information
