Reduced-complexity downlink cell-free mmWave Massive MIMO systems with fronthaul constraints

Cell-free architectures have recently emerged as a promising architecture with the potential to offer equal user-rates throughout the coverage area. Given the spectral congestion at sub-6 GHz bands, there is a pressing interest in evaluating the cell-free performance in the mmWave regime. This paper...

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Published in:2019 27th European Signal Processing Conference (EUSIPCO) pp. 1 - 5
Main Authors: Femenias, Guillem, Riera-Palou, Felip
Format: Conference Proceeding
Language:English
Published: EURASIP 01.09.2019
Subjects:
Antenna arrays
Baseband
Channel estimation
Downlink
Massive MIMO
Radio frequency
Training
ISSN:2076-1465
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Abstract Cell-free architectures have recently emerged as a promising architecture with the potential to offer equal user-rates throughout the coverage area. Given the spectral congestion at sub-6 GHz bands, there is a pressing interest in evaluating the cell-free performance in the mmWave regime. This paper addresses the design and performance evaluation of the downlink segment of cell-free mmWave Massive MIMO system using hybrid precoders under the realistic assumption of capacity-constrained fronthaul links. Towards this end, a hybrid digital-analog beamforming is proposed where the high-dimensional analog part only depends on second-order large scale information. The low-dimensional digital part can then be implemented using standard precoding techniques that rely on instantaneous CSI. Numerical results demonstrate that this reduced-complexity architecture, when combined with an adequate user selection (scheduling), attains excellent Max-Min performance when operating under limited-fronthaul constraints.
AbstractList Cell-free architectures have recently emerged as a promising architecture with the potential to offer equal user-rates throughout the coverage area. Given the spectral congestion at sub-6 GHz bands, there is a pressing interest in evaluating the cell-free performance in the mmWave regime. This paper addresses the design and performance evaluation of the downlink segment of cell-free mmWave Massive MIMO system using hybrid precoders under the realistic assumption of capacity-constrained fronthaul links. Towards this end, a hybrid digital-analog beamforming is proposed where the high-dimensional analog part only depends on second-order large scale information. The low-dimensional digital part can then be implemented using standard precoding techniques that rely on instantaneous CSI. Numerical results demonstrate that this reduced-complexity architecture, when combined with an adequate user selection (scheduling), attains excellent Max-Min performance when operating under limited-fronthaul constraints.
Author Femenias, Guillem
Riera-Palou, Felip
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  organization: Universitat de les Illes Balears,Mobile Communications Group,Mallorca (Illes Balears),Spain,07122
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  givenname: Felip
  surname: Riera-Palou
  fullname: Riera-Palou, Felip
  organization: Universitat de les Illes Balears,Mobile Communications Group,Mallorca (Illes Balears),Spain,07122
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Snippet Cell-free architectures have recently emerged as a promising architecture with the potential to offer equal user-rates throughout the coverage area. Given the...
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SubjectTerms Antenna arrays
Baseband
Channel estimation
Downlink
Massive MIMO
Radio frequency
Training
Title Reduced-complexity downlink cell-free mmWave Massive MIMO systems with fronthaul constraints
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