Article (Périodiques scientifiques)
Hybrid Analog/Digital Precoding for Downlink Massive MIMO LEO Satellite Communications
You, Li; Qiang, Xiaoyu; Li, Ke-Xin et al.
2022In IEEE Transactions on Wireless Communications, 21 (8), p. 5962 - 5976
Peer reviewed vérifié par ORBi
 

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Résumé :
[en] Massive multiple-input multiple-output (MIMO) is promising for low earth orbit (LEO) satellite communications due to the potential in enhancing the spectral efficiency. However, the conventional fully digital precoding architectures might lead to high implementation complexity and energy consumption. In this paper, hybrid analog/digital precoding solutions are developed for the downlink operation in LEO massive MIMO satellite communications, by exploiting the slow-varying statistical channel state information (CSI) at the transmitter. First, we formulate the hybrid precoder design as an energy efficiency (EE) maximization problem by considering both the continuous and discrete phase shift networks for implementing the analog precoder. The cases of both the fully and the partially connected architectures are considered. Since the EE optimization problem is nonconvex, it is in general difficult to solve. To make the EE maximization problem tractable, we apply a closed-form tight upper bound to approximate the ergodic rate. Then, we develop an efficient algorithm to obtain the fully digital precoders. Based on which, we further develop two different efficient algorithmic solutions to compute the hybrid precoders for the fully and the partially connected architectures, respectively. Simulation results show that the proposed approaches achieve significant EE performance gains over the existing baselines, especially when the discrete phase shift network is employed for analog precoding.
Disciplines :
Sciences informatiques
Auteur, co-auteur :
You, Li
Qiang, Xiaoyu
Li, Ke-Xin
TSINOS, Christos ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
Wang, Wenjin
Gao, Xiqi
OTTERSTEN, Björn  ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
Co-auteurs externes :
yes
Langue du document :
Anglais
Titre :
Hybrid Analog/Digital Precoding for Downlink Massive MIMO LEO Satellite Communications
Date de publication/diffusion :
2022
Titre du périodique :
IEEE Transactions on Wireless Communications
ISSN :
1536-1276
eISSN :
1558-2248
Maison d'édition :
IEEE, Etats-Unis
Volume/Tome :
21
Fascicule/Saison :
8
Pagination :
5962 - 5976
Peer reviewed :
Peer reviewed vérifié par ORBi
Focus Area :
Security, Reliability and Trust
Disponible sur ORBilu :
depuis le 27 décembre 2022

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