Beamspace MIMO-NOMA for millimeter-wave communications using lens antenna arrays

Wang, Bichai, Dai, Linglong, Gao, Xiqi and Hanzo, Lajos (2018) Beamspace MIMO-NOMA for millimeter-wave communications using lens antenna arrays. In 2017 IEEE 86th Vehicular Technology Conference, VTC Fall 2017 - Proceedings. vol. 2017-September, IEEE. pp. 1-5 . (doi:10.1109/VTCFall.2017.8288345).

Abstract

The recent concept of beamspace multiple-input multiple-output (MIMO) is capable of significantly reducing the number of radio-frequency (RF) chains required by millimeterwave (mmWave) massive MIMO systems. However, the fundamental limit of the existing beamspace MIMO is that, the number of supported users cannot be higher than the number of RF chains using the same time-frequency resources. To break this limit, beamspace MIMO is integrated with non-orthogonal multiple access (NOMA) in the proposed MIMO-NOMA system in this paper, where the number of supported users can be higher than the number of RF chains. To reduce the interbeam interference, a transmit precoding (TPC) scheme based on the principle of zero-forcing (ZF) is designed. Furthermore, a dynamic power allocation scheme is proposed for maximizing the achievable sum rate. Moreover, a low-complexity iterative optimization algorithm is conceived for dynamic power allocation. Simulation results show that the proposed beamspace MIMONOMA achieves a higher spectrum and energy efficiency than the existing beamspace MIMO for mmWave communications.

This record has no associated files available for download.

Contributors

Author: Lajos Hanzo

Download statistics