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Performance of a 28 GHz Two-Stage Rotman Lens Beamformer for Millimeter Wave Cellular Systems

Abbasi, Muhammad Ali Babar ; Tataria, Harsh LU ; Fusco, Vincent F and Matthaiou, Michail (2018) 13th European Conference on Antennas and Propagation 2019
Abstract
Phase shifter-based hybrid beamforming has received a lot of attention at millimeter-wave frequencies for cellular communications. Nevertheless, the implementation complexity of such beamformers is rather high due to the complexities involved in designing and fabricating the required radio-frequency (RF) circuits. In contrast, lens-based RF beamformers significantly reduce the implementation complexity, as all active circuits can be replaced by a passive device. In this paper, we present the sum spectral efficiency performance of an uplink multiuser multiple-input multiple-output (MU-MIMO) system with a 28 GHz Rotman lens. An asymmetric two-stage stacked design is fabricated with a 15 element 3 x 5 uniform rectangular array feeding 9 RF... (More)
Phase shifter-based hybrid beamforming has received a lot of attention at millimeter-wave frequencies for cellular communications. Nevertheless, the implementation complexity of such beamformers is rather high due to the complexities involved in designing and fabricating the required radio-frequency (RF) circuits. In contrast, lens-based RF beamformers significantly reduce the implementation complexity, as all active circuits can be replaced by a passive device. In this paper, we present the sum spectral efficiency performance of an uplink multiuser multiple-input multiple-output (MU-MIMO) system with a 28 GHz Rotman lens. An asymmetric two-stage stacked design is fabricated with a 15 element 3 x 5 uniform rectangular array feeding 9 RF down-conversion chains towards baseband. Zero-forcing processing is employed at baseband for interference nulling and multistream recovery. Our results show that the MU-MIMO gains are substantially more pronounced for the two-stage architecture relative to a single-stage design due to the inclusion of the elevation multipath components. Moreover, we show that the asymmetric design can help to further reduce the implementation complexity, since the conventional beam selection network can be omitted from the RF front-end. (Less)
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author
; ; and
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
submitted
subject
keywords
millimeter-wave antennas, millimeter-wave communication, Rotman lens arrays, RF switching, zero-forcing beamforming
host publication
13th European Conference on Antennas and Propagation 2019 (EUCAP)
pages
4 pages
conference name
13th European Conference on Antennas and Propagation 2019
conference location
Krakow, Poland
conference dates
2019-03-31 - 2019-04-05
language
English
LU publication?
no
id
5d1f6832-1243-4afd-9795-b01924c00fa0
date added to LUP
2018-11-27 20:39:31
date last changed
2018-11-29 13:53:45
@inproceedings{5d1f6832-1243-4afd-9795-b01924c00fa0,
  abstract     = {{Phase shifter-based hybrid beamforming has received a lot of attention at millimeter-wave frequencies for cellular communications. Nevertheless, the implementation complexity of such beamformers is rather high due to the complexities involved in designing and fabricating the required radio-frequency (RF) circuits. In contrast, lens-based RF beamformers significantly reduce the implementation complexity, as all active circuits can be replaced by a passive device. In this paper, we present the sum spectral efficiency performance of an uplink multiuser multiple-input multiple-output (MU-MIMO) system with a 28 GHz Rotman lens. An asymmetric two-stage stacked design is fabricated with a 15 element 3 x 5 uniform rectangular array feeding 9 RF down-conversion chains towards baseband. Zero-forcing processing is employed at baseband for interference nulling and multistream recovery. Our results show that the MU-MIMO gains are substantially more pronounced for the two-stage architecture relative to a single-stage design due to the inclusion of the elevation multipath components. Moreover, we show that the asymmetric design can help to further reduce the implementation complexity, since the conventional beam selection network can be omitted from the RF front-end.}},
  author       = {{Abbasi, Muhammad Ali Babar and Tataria, Harsh and Fusco, Vincent F and Matthaiou, Michail}},
  booktitle    = {{13th European Conference on Antennas and Propagation 2019 (EUCAP)}},
  keywords     = {{millimeter-wave antennas; millimeter-wave communication; Rotman lens arrays; RF switching; zero-forcing beamforming}},
  language     = {{eng}},
  month        = {{10}},
  title        = {{Performance of a 28 GHz Two-Stage Rotman Lens Beamformer for Millimeter Wave Cellular Systems}},
  url          = {{https://lup.lub.lu.se/search/files/54915530/1570503392.pdf}},
  year         = {{2018}},
}