Universiti Teknologi Malaysia Institutional Repository

Hybrid beamformer exploiting multistream per user transmission for millimeter-wave NOMA communications

Badrudeen, Abdulahi Abiodun and Leow, Chee Yen and Won, Seunghwan (2022) Hybrid beamformer exploiting multistream per user transmission for millimeter-wave NOMA communications. IEEE Access, 10 (NA). pp. 23074-23085. ISSN 2169-3536

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Official URL: http://dx.doi.org/10.1109/ACCESS.2022.3152537

Abstract

This treatise investigates multistream hybrid beamforming (HBF) for a millimeter-wave non-orthogonal multiple access (NOMA) system deployed in a downlink of an urban microcell environment. Maximization problem is developed to optimize sum-rate. For the sake of ensuring high correlation of users' channels, user's clustering and ordering are based on the angle of arrivals and users' channel-weights, respectively. An optimized analog combiner of each user is obtained from the first N {s} column vectors of the left unitary matrix derived from the singular value decomposition of the channel of each user. Analog beamformer is matched to the phase of the strong users ' composite intermediate analog channel to maximize the beamforming gain. Both the analog combiner and precoder for sub-connected structure (SCS) are formulated via a novel dominant sub-array matrix elements' extractor. Conventional zero-forcing processing is contemplated for digital precoding. Memory space complexity is evaluated to corroborate the simplicity of the proposed schemes' computational complexity. Results obtained from the simulation exhibit that HBF-NOMA attain superior sum-rate than HBF-orthogonal multiple access and conventional multiuser schemes in line of sight link. Lastly, the proposed SCS-HBF-NOMA precoding scheme performs higher than fully connected counterpart in terms of energy efficiency.

Item Type:Article
Uncontrolled Keywords:Fully connected structure, millimeter-wave, multistream hybrid beamforming, NOMA, sub-connected structure, sum-rate maximization
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions:Electrical Engineering
ID Code:104362
Deposited By: Widya Wahid
Deposited On:04 Feb 2024 09:34
Last Modified:04 Feb 2024 09:34

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