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Hybrid Analog-Digital Precoding Revisited Under Realistic RF Modeling

Garcia-Rodriguez, A; Venkateswaran, V; Rulikowski, P; Masouros, C; (2016) Hybrid Analog-Digital Precoding Revisited Under Realistic RF Modeling. IEEE WIRELESS COMMUNICATIONS LETTERS , 5 (5) pp. 528-531. 10.1109/LWC.2016.2598777. Green open access

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Abstract

In this letter, we revisit hybrid analog-digital precoding systems with emphasis on the modeling of their radio-frequency (RF) losses, to realistically evaluate their benefits in 5G system implementations. We focus on fully-connected analog beamforming networks (FC-ABFNs) and on discrete Fourier transform implementations, and decompose these as a bank of commonly used RF components. We then model their losses based on their S-parameters. Our results reveal that the performance and energy efficiency of hybrid precoding systems are severely affected once these, commonly ignored, losses are considered in the overall design. In this context, we also show that hybrid precoder designs similar to Butler matrices are capable of providing better performances than FC-ABFN for systems with a large number of RF chains.

Type: Article
Title: Hybrid Analog-Digital Precoding Revisited Under Realistic RF Modeling
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/LWC.2016.2598777
Publisher version: http://dx.doi.org/10.1109/LWC.2016.2598777
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 3.0 License. For more information, see http://creativecommons. org/licenses/by/3.0/
Keywords: Science & Technology, Technology, Computer Science, Information Systems, Engineering, Electrical & Electronic, Telecommunications, Computer Science, Engineering, Analog beamforming networks, hybrid precoding, millimeter wave, massive MIMO, Butler matrix, MIMO SYSTEMS, DESIGN
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1486124
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