Hybrid Precoding-Based Millimeter Wave Massive MIMO-NOMA Systems

Symmetry

Wenjuan Zhang¹  Yinhao Zhang¹  Fuxin Xu¹  Honggui Deng¹  Zaoxing Zhu¹  Gang Liu¹ 

[1]School of Physics and Electronics, Central South University, Lushan South Road, Changsha 410083, China

关键词: massive MIMO;    millimeter-wave;    hybrid precoding;    non-orthogonal multiple access;   

DOI  :  10.3390/sym14020412

来源: DOAJ

【 摘 要 】

A symmetry-based hybrid precoder and combiner is a high spectral efficiency structure in millimeter-wave (mmWave) massive multiple-input multiple-output (mMIMO) non-orthogonal multiple access (NOMA) system. To improve the spectral efficiency of the mmWave mMIMO-NOMA system, we first propose a user grouping scheme to suppress the strong inter-user interference caused by NOMA, then the hybrid precoder based on user channel alignment and the zero-forcing algorithm is constructed to further improve the signal-to-interference-plus-noise ratio (SINR) of the receiver. Subsequently, the non-convex spectral efficiency optimization problem is transformed into a convex optimization problem of inter-cluster power allocation and the closed-form solution for the optimal power under the minimum rate constraint is obtained by solving the KKT condition to further improve the spectral efficiency. The simulation results show that the proposed scheme can achieve higher spectral efficiency compared to orthogonal multiple access (OMA), fixed power allocation (FPA), K-means, and cluster head selection (CHS).

【 授权许可】

Unknown