1 Department of Electronic/Electrical Engineering, Federal Polytechnic, Oko, Aguata, Anambra State, Nigeria.
2 Department of Electronic Engineering, University of Nigeria, Nsukka, Enugu State, Nigeria.
Research Article
World Journal of Advanced Research and Reviews, 2024, 22(02), 306-325
Received on 16 March 2024; revised on 01 May 2024; accepted on 03 May 2024
In this paper, we study the hybrid beamforming design for millimeter-wave (mmWave) massive multiple-input multiple-output (mMIMO) systems. The designing of hybrid beamforming for orthogonal frequency-division multiplexing (OFDM) systems is tasking since its analog beamforming is shared among all subcarriers. We adopt a two-step technique for designing the analog and digital beamforming separately in order to maximize the average achievable energy and spectral efficiency of frequency-selective mmWave mMIMO-OFDM systems. Firstly, the analog beamforming design is based on the viewpoint of sub-systems (SS) and the goal is to optimize the array gain and radio frequency chains. Secondly, the digital beamforming design is carried out by using the regularized channel diagonalization (RCD) and block diagonalization (BD) solutions. On the other hand, the BD solution is modified for single-user. Thus, we propose the use of SS-RCD for multi-user and SS-BD for single-user hybrid beamforming designs. The solutions provide interference suppression but differ in low-SNR performance when communicating to many mobile users via data streams. Simulation results present that our hybrid beamforming design outperforms several other designs.
Hybrid beamforming; Sub-system; Block diagonalization; Regularized channel diagonalization; Millimeter-wave; Massive MIMO-OFDM.
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Gerald Chukwudi Eze and Mamilus Aginwa Ahaneku. Sub-System Architecture for millimeter-wave massive MIMO systems. World Journal of Advanced Research and Reviews, 2024, 22(2), 306-325. Article DOI: https://doi.org/10.30574/wjarr.2024.22.2.1352