Wideband Cell-Free mmWave Massive MIMO-OFDM: Beam Squint-Aware Channel Covariance-Based Hybrid Beamforming

This paper considers the design of beam squint-aware channel covariance-based hybrid beamformers for wideband cell-free millimeter-wave (mmWave) massive multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) systems. Single and double phase shifter-based analog radio...

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Bibliographic Details
Published in:IEEE transactions on wireless communications Vol. 21; no. 7; pp. 4695 - 4710
Main Authors: Femenias, Guillem, Riera-Palou, Felip
Format: Journal Article
Language:English
Published: New York IEEE 01.07.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Antenna arrays
Array signal processing
beam squint
Beamforming
Broadband
Carrier frequencies
Cell-free massive multiple-input multiple-output (MIMO)
Covariance
Hybrid beamforming
Massive MIMO
Millimeter waves
MIMO communication
MIMO-orthogonal frequency division multiplexing (OFDM)
OFDM
Orthogonal Frequency Division Multiplexing
Phase shift
Phase shifters
Radio frequency
Wideband
Wireless communication
ISSN:1536-1276, 1558-2248
Online Access:Get full text
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Summary:This paper considers the design of beam squint-aware channel covariance-based hybrid beamformers for wideband cell-free millimeter-wave (mmWave) massive multiple-input multiple-output (MIMO)-orthogonal frequency division multiplexing (OFDM) systems. Single and double phase shifter-based analog radio frequency (RF) precoder/combiner strategies are proposed that are based on dissimilar beam squint awareness assumptions. The digital precoding/combining stage is implemented using centralized designs maximizing the signal-to-interference-plus-noise-ratio (SINR) and relying on the uplink (UL)/downlink (DL) duality enabled by the time division duplex (TDD) protocol and the use of either phase shift-aware minimum mean square error (MMSE) or phase shift-unaware linear MMSE (LMMSE) channel estimators. The performance of the proposed beam squint-aware hybrid beamforming strategies is assessed through extensive numerical simulations under different scenarios. Numerical results show that beam squint-aware designs outperform the beam squint-unaware strategies, specially in typical wideband cell free mmWave massive MIMO-OFDM scenarios where a combination of a very high carrier frequency, a large system bandwidth, and a large-scale antenna array causes the spatial-wideband effect.
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2021.3132414