联合时域−波束域非正交多址接入

Joint time and beam domain non-orthogonal multiple access

为了提高系统容纳连接设备的能力,提出了一种适用于毫米波大规模多输入多输出系统的联合时域−波束域非正交多址接入方案。该方案利用用户空间信道的相关性和差异性实现波束域接入,利用稀疏扩频技术实现时域接入,并以提高系统的通信可靠性为优化目标,构造并求解了联合域稀疏接入矩阵设计的优化问题。最后,基于联合域信道质量对接入矩阵进行重构,并在消息传递算法中加入干扰消除操作,降低译码复杂度的同时提高了通信可靠性。

In order to improve the system’s ability to accommodate connected devices,a joint time and beam domain non-orthogonal multiple access(NOMA)scheme was proposed,which was suitable for millimeter wave massive multiple-input multiple-output(MIMO)systems.The correlation and difference of the users’channel were utilized to realize beam-domain NOMA,and sparse spreading technology was utilized to realize time-domain NOMA.With the optimization goal of improving the communication reliability of the system,optimization problem of the joint domain sparse access matrix design was constructed and solved.Finally,the access matrix was reconstructed based on the channel quality of the joint domain,and the interference cancellation operation was added to the message passing algorithm(MPA),which reduced the decoding complexity and improves the communication reliability.