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Low Complex Analog Beamforming Design in Multi-User mmWave Non-Orthogonal Multiple Access (NOMA)

Publication Type : Journal Article

Publisher : World Scientific Press

Source : Journal of Circuits, Systems and Computers

Url : https://www.worldscientific.com/doi/10.1142/S0218126623502195

Campus : Bengaluru

School : School of Engineering

Year : 2023

Abstract : In this paper, we investigate non-orthogonal multiple access (NOMA) scheme in millimeter wave (mmWave) communication to serve nonclustered multiple users. We explore a low complex design of an analog beamforming weight vector and the power requirement of users aiming to minimize the total power targeting to satisfy the spectral efficiency (SE) requirements of all users. We propose a low complex constant modulus analog beamforming (CMAB) algorithm, where we first reduce the number of signal to interference plus noise ratio (SINR) constraints, which is attained from the order of equivalent channel gain of users. Then, the nonconvex constraint of constant modulus (CM) is relaxed and semi-definite programming (SDP) is used to solve the problem. Obtained weight vector and power for all users are optimal since the rank of positive semi-definite (PSD) matrix is one. Later, CM constraint is included. Simulation results show that the proposed algorithm requires less power with minimum complexity compared to the existing research, digital beamforming NOMA and time division multiple access (TDMA) for the same SE requirements.

Cite this Research Publication : S. Sumathi, T. K. Ramesh and Zhiguo Ding, “Low complex analog beamforming design in multi user mm-wave Non-Orthogonal Multiple Access”, Journal of Circuits, Systems and Computers, Impact factor 1.33, 2023.

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