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Energy-Efficient Hybrid Symbol-Level Precoding via Phase Shifter Selection in mmWave MU-MIMO Systems
Haqiqatnejad, Alireza; Kayhan, Farbod; Ottersten, Björn
2021In Energy-Efficient Hybrid Symbol-Level Precoding via Phase Shifter Selection in mmWave MU-MIMO Systems
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Keywords :
Energy efficiency; Hybrid symbol-level precoding; Multiuser mmWave massive MIMO; Phase shifter selection
Abstract :
[en] We address the symbol-level precoding design problem for the downlink of a multiuser millimeter wave (mmWave) multiple-input multiple-output wireless system. We consider a hybrid analog-digital architecture with phase shifter selection where a small-sized baseband precoder is followed by two successive networks of analog on-off switches and variable phase shifters according to a fully-connected structure. We jointly optimize the digital baseband precoder and the states of the switching network on a symbol-level basis, i.e., by exploiting both the channel state information (CSI) and the instantaneous data symbols, while the phase-shifting network is designed only based on the CSI. Our approach to this joint optimization is to minimize the Euclidean distance between the optimal fully-digital and the hybrid symbol-level precoders. It is shown via numerical results that using the proposed approach, up to 50 percent of the phase shifters can be switched off on average, allowing for reductions in the power consumption of the phase-shifting network. Adopting appropriate power consumption models for the analog precoder, our energy efficiency analysis further shows that this power reduction can substantially improve the energy efficiency of the hybrid precoding compared to the fully-digital and the state-of-the-art schemes.
Research center :
Interdisciplinary Centre for Security, Reliability and Trust (SnT) > SIGCOM
Disciplines :
Electrical & electronics engineering
Author, co-author :
Haqiqatnejad, Alireza ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom
Kayhan, Farbod ;  University of Surrey > Institute for Communication Systems, Department of Electrical and Electronic Engineering
Ottersten, Björn ;  University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT)
External co-authors :
yes
Language :
English
Title :
Energy-Efficient Hybrid Symbol-Level Precoding via Phase Shifter Selection in mmWave MU-MIMO Systems
Publication date :
25 January 2021
Event name :
IEEE Global Communications Conference (GLOBECOM)
Event organizer :
IEEE
Event place :
Taipei, Taiwan
Event date :
from 07-12-2020 to 11-12-2020
Audience :
International
Main work title :
Energy-Efficient Hybrid Symbol-Level Precoding via Phase Shifter Selection in mmWave MU-MIMO Systems
Pages :
1-6
Peer reviewed :
Peer reviewed
Focus Area :
Security, Reliability and Trust
FnR Project :
FNR11332341 - Enhanced Signal Space Optimization For Satellite Communication Systems, 2016 (01/02/2017-31/01/2020) - Farbod Kayhan
Funders :
FNR - Fonds National de la Recherche [LU]
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