Ultra-Massive Multiple Input Multiple Output Technologies for 6G Wireless Networks
Abstract
The increasing global demand for ultra-high spectral efficiencies, data rates, speeds, and bandwidths in next-generation wireless networks motivate the exploration of peak capabilities of ultra-massive multiple input multiple output (mMIMO) wireless access technology at THz bands (0.1 THz – 10 THz). The smaller wavelengths (in the order of microns) of these frequencies give an advantage of making possible high gain antennas with smaller physical dimensions and allowing massive spatial multiplexing. This paper presents the design of an ultra-mMIMO hybrid beamforming system for multi users and its feasibility to function at THz frequency bands. The functionality of the proposed system is verified rigorously using higher order modulation schemes to have higher spectral efficiencies using performance metrics that includes error vector magnitude, symbol constellations, and antenna array radiation beams. The performance results suggest to use a particular mMIMO antenna configuration based on the number of independent data streams/user and strongly suggested to use maximum number of data streams/user in order to achieve higher throughputs that satisfy the needs of 6G wireless systems. Also the performance of proposed system at 0.14 THz is compared with mmWave hybrid beamforming systems that operate at 28 GHz and 73 GHz bands.
