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引用次数: 35
摘要
本文研究了非正交多址(fc - mmimo - noma)技术下无小区大规模多输入多输出的上行性能,导出了共轭波束成形接收机频谱效率表达式的严格近似表达式。在此基础上,提出了一种考虑用户服务质量(QoS)约束、传输功率约束和连续干扰消除(SIC)约束的全频谱效率最大化算法。由于原问题为非凸问题,因此本文采用顺序凸逼近(SCA)方法,将该问题转化为迭代几何规划问题。仿真结果表明,与正交多址(OMA)相比,cf - mimo - noma能够更有效地利用稀缺频段。此外,与等功率控制(EPC)方案相比,该算法具有更快的收敛速度,能够显著提高总频谱效率。
Spectral Efficiency Maximization for Uplink Cell-Free Massive MIMO-NOMA Networks
In this paper, it investigates the uplink performance of cell-free massive multiple-input multiple-output with non-orthogonal multiple access (CF-mMIMO-NOMA) technique and derives a rigorous closed-form approximation of the spectral efficiency expression for conjugate beamforming receiver. Based on this novel closed-form result, this paper proposes a total spectral efficiency maximization algorithm, subjecting to each user's quality-of-service (QoS) constraint, transmission power constraint, and successive interference cancellation (SIC) constraint. The original problem is non-convex, and hence, the sequential convex approximation (SCA) method is utilized in this paper and converts this issue into an iterative geometric programming (GP) problem. Simulation results demonstrate that CF-mMIMO-NOMA is able to exploit the scarce spectrum bands more efficiently than the orthogonal multiple access (OMA) counterpart. Furthermore, the proposed algorithm has a faster convergence rate and is able to significantly improve the total spectral efficiency, compared with the equal power control (EPC) scheme.