Enabling Technologies for Spectrum and Energy Efficient NOMA-MmWave-MaMIMO Systems
Yue Wang, Zhi Tian, Xiuzhen Cheng
Abstract
With the proliferation of versatile devices and data-consuming services, the quest for spectrum efficiency has led to the merging of three disruptive technologies: millimeter-wave (mmWave) communications, massive MIMO (maMIMO), and non-orthogonal multiple access (NOMA). Emerging wireless networks move toward ultra-dense deployment of massive devices with diverse service demands, which call for efficient spectrum sharing even on mmWave bands. This article studies some key techniques that account for the unique angular selectivity of mmWave maMIMO channels and thus enable re-engineering the spectrum sharing paradigm of NOMA. An overview is provided on research challenges and opportunities related to spectrum and energy efficiency of spectrum-shared NOMA-mmWave systems with maMIMO, with focus on high-performance and low-complexity channel sensing, optimal sensing resource allocation, security and privacy provisioning, and learning- aided real-time system optimization.