Enabling Cooperative Hybrid Beamforming in TDD-based Distributed MIMO Systems

Distributed massive MIMO networks are envisioned to realize cooperative multi-point transmission in next-generation wireless systems. For efficient cooperative hybrid beamforming, the cluster of access points (APs) needs to obtain precise estimates of the uplink channel to perform reliable downlink...

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Published in:arXiv.org 2023-08
Main Authors: Torkzaban, Nariman, Khojastepour, Amir, Baras, John S
Format: Article
Language:English
Subjects:
Beamforming
Calibration
Clusters
Downlinking
Hybrid systems
MIMO communication
Performance degradation
Radio frequency
Reciprocity
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Khojastepour, Amir
Baras, John S
description Distributed massive MIMO networks are envisioned to realize cooperative multi-point transmission in next-generation wireless systems. For efficient cooperative hybrid beamforming, the cluster of access points (APs) needs to obtain precise estimates of the uplink channel to perform reliable downlink precoding. However, due to the radio frequency (RF) impairments between the transceivers at the two en-points of the wireless channel, full channel reciprocity does not hold which results in performance degradation in the cooperative hybrid beamforming (CHBF) unless a suitable reciprocity calibration mechanism is in place. We propose a two-step approach to calibrate any two hybrid nodes in the distributed MIMO system. We then present and utilize the novel concept of reciprocal tandem to propose a low-complexity approach for jointly calibrating the cluster of APs and estimating the downlink channel. Finally, we validate our calibration technique's effectiveness through numerical simulation.
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subjects Beamforming
Calibration
Clusters
Downlinking
Hybrid systems
MIMO communication
Performance degradation
Radio frequency
Reciprocity
title Enabling Cooperative Hybrid Beamforming in TDD-based Distributed MIMO Systems
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