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Beam Pattern Optimization Method for Subarray-Based Hybrid Beamforming Systems

Eisenbeis, Joerg; Pfaff, Jonas; Karg, Christian; Kowalewski, Jerzy; Li, Yueheng; Pauli, Mario; Zwick, Thomas

Abstract:
Massive multiple-input multiple-output (MIMO) systems operating at millimeter-wave (mmWave) frequencies promise to satisfy the demand for higher data rates in mobile communication networks. A practical challenge that arises is the calibration in amplitude and phase of these massive MIMO systems, as the antenna elements are too densely packed to provide a separate calibration branch for measuring them independently. Over-the-air (OTA) calibration methods are viable solutions to this problem. In contrast to previous works, the here presented OTA calibration method is investigated and optimized for subarray-based hybrid beamforming (SBHB) systems. SBHB systems represent an efficient architectural solution to realize massive MIMO systems. Moreover, based on OTA scattering parameter measurements, the ambiguities of the phase shifters are exploited and two criteria to optimize the beam pattern are formulated. Finally, the optimization criteria are examined in measurements utilizing a novel SBHB receiver system operating at 27.8 GHz.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129361
Veröffentlicht am 05.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochfrequenztechnik und Elektronik (IHE)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 28.12.2020
Sprache Englisch
Identifikator ISSN: 1530-8669, 1530-8677
KITopen-ID: 1000129361
Erschienen in Wireless communications and mobile computing
Verlag Hindawi
Band 2020
Seiten Art.-Nr.: 8853794
Nachgewiesen in Web of Science
Scopus
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