beamforming; NTN UT; satellite communications; TMA; Array beamforming; Directionof-arrival (DOA); Network users; Non-terrestrial network user terminal; Phased-arrays; Power; Satellite communications; Terrestrial networks; Time modulated arrays; User terminals; Computer Networks and Communications
Résumé :
[en] Though beamforming is the fundamental element of satellite communication, it incurs costs, complexity, and power consumption. In this paper, we study a Time-Modulated Array (TMA) beamforming design on the Non-Terrestrial Network (NTN) User Terminal (UT) to receive a signal from a LEO satellite downlink. Despite its simplicity and cost-effectiveness, conventional TMA has intrinsic gain, flexibility, and interference limitations. We compared TMA beamforming with the conventional phased array and studied a tri-state switching method to address the TMA limitations. Based on the 3GPP beam pattern, we studied the beamforming cost and complexity to achieve a viable Signal-To-Noise Plus Interference Ratio (SINR). To facilitate low-cost TMA beamforming, we first derive the Direction of Arrival (DoA) to the TMA switching parameters mapping. Subsequently, we formulate a constrained nonlinear multi-variable problem and solve it using iterative optimization based on perfect DoA. Additionally, we use an analytical approach to suppress sidelobes and unused harmonics using alternating switching. Furthermore, we develop an Alternating Direction Method of Multipliers (ADMM) and Adaptive Switching Parameters Control (ASPC) methods to design TMA beamforming based on a beacon signal. We compare TMA and phased array beamforming techniques, confirming the promising performance of TMA with reduced cost, complexity, and power consumption.
Disciplines :
Sciences informatiques
Auteur, co-auteur :
LEMA, Gebrehiwet Gebrekrstos ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
LAGUNAS, Eva ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
MYSORE RAMA RAO, Bhavani Shankar ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SPARC
Grotz, Joel ; SES, Luxembourg
Co-auteurs externes :
no
Langue du document :
Anglais
Titre :
Time Modulated Arrays Beamforming for Non-Terrestrial Network User Terminal
Date de publication/diffusion :
08 janvier 2025
Titre du périodique :
IEEE Open Journal of the Communications Society
eISSN :
2644-125X
Maison d'édition :
Institute of Electrical and Electronics Engineers Inc.
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