Hybrid Precoder Design for Angle-of-Departure Estimation With Limited-Resolution Phase Shifters

Hybrid analog-digital beamforming stands out as a key enabler for future communication systems with a massive number of antennas. In this paper, we investigate the hybrid precoder design problem for angle-of-departure (AoD) estimation, where we take into account the practical constraint on the limit...

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Published in:	IEEE transactions on communications Vol. 73; no. 6; pp. 4439 - 4453
Main Authors:	Huang, Huiping, Furkan Keskin, Musa, Wymeersch, Henk, Cai, Xuesong, Wu, Linlong, Thunberg, Johan, Tufvesson, Fredrik
Format:	Journal Article
Language:	English
Published:	New York IEEE 2025 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Accuracy alternating direction method of multipliers alternating optimization angle-of-departure estimation Antennas Array signal processing Beamforming Communications systems Electrical Engineering, Electronic Engineering, Information Engineering Elektroteknik och elektronik Engineering and Technology Estimation Geometry Hybrid beamforming hybrid precoder Millimeter wave communication Optimization phase shifter Phase shifters Phased arrays Radio frequency Signal Processing Signalbehandling Teknik Upper bounds
ISSN:	0090-6778, 1558-0857, 1558-0857
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Abstract	Hybrid analog-digital beamforming stands out as a key enabler for future communication systems with a massive number of antennas. In this paper, we investigate the hybrid precoder design problem for angle-of-departure (AoD) estimation, where we take into account the practical constraint on the limited resolution of phase shifters. Our goal is to design a radio-frequency (RF) precoder and a base-band (BB) precoder to estimate AoD of the user with high accuracy. To this end, we propose a two-step strategy where we first obtain the fully digital precoder that minimizes the angle error bound, and then the resulting digital precoder is decomposed into an RF precoder and a BB precoder, based on the alternating optimization and the alternating direction method of multipliers. Furthermore, we derive the quantization error upper bound and provide convergence conditions for the proposed algorithm. Numerical results demonstrate the superior performance of the proposed method over state-of-the-art baselines.
AbstractList	Hybrid analog-digital beamforming stands out as a key enabler for future communication systems with a massive number of antennas. In this paper, we investigate the hybrid precoder design problem for angle-of-departure (AoD) estimation, where we take into account the practical constraint on the limited resolution of phase shifters. Our goal is to design a radio-frequency (RF) precoder and a base-band (BB) precoder to estimate AoD of the user with high accuracy. To this end, we propose a two-step strategy where we first obtain the fully digital precoder that minimizes the angle error bound, and then the resulting digital precoder is decomposed into an RF precoder and a BB precoder, based on the alternating optimization and the alternating direction method of multipliers. Furthermore, we derive the quantization error upper bound and provide convergence conditions for the proposed algorithm. Numerical results demonstrate the superior performance of the proposed method over state-of-the-art baselines.
Author	Cai, Xuesong Wu, Linlong Tufvesson, Fredrik Wymeersch, Henk Furkan Keskin, Musa Thunberg, Johan Huang, Huiping
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Snippet	Hybrid analog-digital beamforming stands out as a key enabler for future communication systems with a massive number of antennas. In this paper, we investigate...
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SubjectTerms	Accuracy alternating direction method of multipliers alternating optimization angle-of-departure estimation Antennas Array signal processing Beamforming Communications systems Electrical Engineering, Electronic Engineering, Information Engineering Elektroteknik och elektronik Engineering and Technology Estimation Geometry Hybrid beamforming hybrid precoder Millimeter wave communication Optimization phase shifter Phase shifters Phased arrays Radio frequency Signal Processing Signalbehandling Teknik Upper bounds
Title	Hybrid Precoder Design for Angle-of-Departure Estimation With Limited-Resolution Phase Shifters
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