Energy Efficient Hybrid Precoder for Cell-Free Wideband mmWave Massive MIMO Systems

In a cell-free (CF) wideband millimeter-wave (mmWave) massive multiple-input multiple-output (mMIMO) system, a small number of users are simultaneously served by a much larger number of distributed access points (APs). These APs employ hybrid precoders to achieve beamforming gain. However, the beam...

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Vydané v:	IEEE communications letters Ročník 27; číslo 9; s. 1
Hlavní autori:	He, Yun, Shen, Min, Wang, Rui, Liu, Xiangyan
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	New York IEEE 01.09.2023 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:	Algorithms Beamforming Broadband Cell-free massive MIMO energy efficiency Greedy algorithms hybrid precoder Millimeter wave communication Millimeter waves millimeter-wave OFDM Optimization Phase shifters Power consumption Power demand Radio frequency Search algorithms Wideband
ISSN:	1089-7798, 1558-2558
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Abstract	In a cell-free (CF) wideband millimeter-wave (mmWave) massive multiple-input multiple-output (mMIMO) system, a small number of users are simultaneously served by a much larger number of distributed access points (APs). These APs employ hybrid precoders to achieve beamforming gain. However, the beam squint caused by the spatial-wideband effect deteriorates the system performance. Moreover, the application of numerous radio frequency (RF) chains increases the power consumption and reduces the global energy efficiency (GEE). The letter focuses on designing energy efficient wideband hybrid precoders using low-resolution phase shifters (PSs) for fully connected (FC) and subarray-based phase shifter (SPS) architectures. A beam squint compensation (BSC) algorithm is proposed based on an iterative heuristic Gram-Schmidt algorithm to design the wideband hybrid precoder with the maximal number of RF chains. Based on the above wideband hybrid precoders, the number of RF chains is optimized as a shortest-path problem and solved by a novel bidirectional greedy tree search algorithm. Simulation results demonstrate that the proposed wideband hybrid precoder design can improve the GEE performance.
AbstractList	In a cell-free (CF) wideband millimeter-wave (mmWave) massive multiple-input multiple-output (mMIMO) system, a small number of users are simultaneously served by a much larger number of distributed access points (APs). These APs employ hybrid precoders to achieve beamforming gain. However, the beam squint caused by the spatial-wideband effect deteriorates the system performance. Moreover, the application of numerous radio frequency (RF) chains increases the power consumption and reduces the global energy efficiency (GEE). The letter focuses on designing energy efficient wideband hybrid precoders using low-resolution phase shifters (PSs) for fully connected (FC) and subarray-based phase shifter (SPS) architectures. A beam squint compensation (BSC) algorithm is proposed based on an iterative heuristic Gram-Schmidt algorithm to design the wideband hybrid precoder with the maximal number of RF chains. Based on the above wideband hybrid precoders, the number of RF chains is optimized as a shortest-path problem and solved by a novel bidirectional greedy tree search algorithm. Simulation results demonstrate that the proposed wideband hybrid precoder design can improve the GEE performance.
Author	Shen, Min Liu, Xiangyan He, Yun Wang, Rui
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Cites_doi	10.1109/LCOMM.2021.3110985 10.1109/JSAC.2020.3000878 10.1109/TVT.2020.3023926 10.1109/TCOMM.2019.2942307 10.1109/JSTSP.2018.2824762 10.1109/JSTSP.2018.2819129 10.1109/ICC.2017.7996792 10.1109/TGCN.2017.2770215 10.1109/TVT.2019.2933058 10.1109/TGCN.2019.2908228 10.23919/JCIN.2019.8917880 10.1109/TWC.2021.3132414 10.1109/TCOMM.2016.2549517
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SubjectTerms	Algorithms Beamforming Broadband Cell-free massive MIMO energy efficiency Greedy algorithms hybrid precoder Millimeter wave communication Millimeter waves millimeter-wave OFDM Optimization Phase shifters Power consumption Power demand Radio frequency Search algorithms Wideband
Title	Energy Efficient Hybrid Precoder for Cell-Free Wideband mmWave Massive MIMO Systems
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