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Hybrid beamforming with reduced number of phase shifters for massive MIMO systems
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Payami, Sohail, Ghoraishi, Mir, Dianati, Mehrdad and Sellathurai , Mathini (2018) Hybrid beamforming with reduced number of phase shifters for massive MIMO systems. IEEE Transactions on Vehicular Technology, 67 (6). pp. 4843-4851. doi:10.1109/TVT.2018.2807921 ISSN 0018-9545.
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Official URL: http://doi.org/10.1109/TVT.2018.2807921
Abstract
In this paper, two novel hybrid beamforming methods are proposed to reduce the cost and power consumption of hybrid beamformers with a subconnected phase shifter network structure in massive multiple-input multiple-output systems. This is achieved by replacing some of the phase shifters with switches, which, in general, are cheaper and have lower power consumption compared to phase shifters. The proposed methods and the closed-form expressions of their performance are derived according to the properties of the elements of the singular vectors of the channel matrix. In the first approach, it is shown that by combining the subconnected phase shifter network with a fully connected switch architecture, the number of the phase shifters can be reduced up to 50%, while the spectral efficiency is preserved. Then, in order to simplify the structure of the switch network, the fully connected switches are replaced by a subconnected switch network, e.g., binary switches. The analytical and simulation results indicate that just by using 25% of phase shifters, 90% spectral efficiency can be achieved. Finally, simulation results indicate that a similar behavior is observed when the wireless channel is considered to be sparse or correlated.
Item Type: | Journal Article | ||||||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||
Library of Congress Subject Headings (LCSH): | MIMO systems, Phase shifters | ||||||||
Journal or Publication Title: | IEEE Transactions on Vehicular Technology | ||||||||
Publisher: | IEEE | ||||||||
ISSN: | 0018-9545 | ||||||||
Official Date: | June 2018 | ||||||||
Dates: |
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Volume: | 67 | ||||||||
Number: | 6 | ||||||||
Page Range: | pp. 4843-4851 | ||||||||
DOI: | 10.1109/TVT.2018.2807921 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 21 February 2018 | ||||||||
Date of first compliant Open Access: | 22 February 2018 | ||||||||
RIOXX Funder/Project Grant: |
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