Pseudo-Inverse vs generalized inverse for C-RAN downlink precoding

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• dc.contributor.author Mojahedian, Mohammad Mahdi
• dc.contributor.author Mosayebi, Reza
• dc.contributor.author Lozano Solsona, Angel
• dc.date.accessioned 2022-02-03T08:51:50Z
• dc.date.available 2022-02-03T08:51:50Z
• dc.date.issued 2021
• dc.description Comunicació presentada a: GLOBECOM 2020 celebrat del 17 a l'11 de desembre de 2020 a Taipei, Taiwan.
• dc.description.abstract This paper tackles the problem of zero-forcing (ZF) precoding for the downlink of centralized radio-access networks operating in a cell-free fashion. While the customary workhorse of ZF precoding is the channel pseudo-inverse, because of the separate power constraint at each participating access point, the pseudo-inverse is not optimum. Rather, it can be improved upon by other inverses that allow conveying stronger signals (or, equivalently, consuming less power) while respecting the same ZF conditions. Motivated by the enormous disparity in computational cost between simple pseudo-inversion and general inversion, we ascertain the performance disadvantage of the former in a wide range of conditions. The welcome conclusion is that pseudo-inversion is close-to-optimum for all operational regimes of interest.
• dc.description.sponsorship Work supported by the European Research Council under the H2020 Framework Programme/ERC grant 694974, and by MINECO's Projects RTI2018-102112 and RTI2018-101040.
• dc.format.mimetype application/pdf
• dc.identifier.citation Mojahedian MM, Mosayebi R, Lozano A. Pseudo-Inverse vs generalized inverse for C-RAN downlink precoding. In: Proceedings of the 2020 IEEE Global Communications Conference (GLOBECOM); 2020 Dec 7-11; Taipei, Taiwan. New York: IEEE; 2021. [5 p.]. DOI: 10.1109/GLOBECOM42002.2020.9348123
• dc.identifier.doi http://dx.doi.org/10.1109/GLOBECOM42002.2020.9348123
• dc.identifier.isbn 978-1-7281-8298-8
• dc.identifier.issn 2576-6813
• dc.identifier.uri http://hdl.handle.net/10230/52414
• dc.language.iso eng
• dc.publisher Institute of Electrical and Electronics Engineers (IEEE)
• dc.relation.ispartof Proceedings of the 2020 IEEE Global Communications Conference (GLOBECOM); 2020 Dec 7-11; Taipei, Taiwan. New York: IEEE; 2021.
• dc.relation.projectID info:eu-repo/grantAgreement/EC/H2020/694974
• dc.relation.projectID info:eu-repo/grantAgreement/ES/2PE/RTI2018-102112
• dc.relation.projectID info:eu-repo/grantAgreement/ES/2PE/RTI2018-101040
• dc.rights © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. http://dx.doi.org/10.1109/GLOBECOM42002.2020.9348123
• dc.rights.accessRights info:eu-repo/semantics/openAccess
• dc.subject.keyword C-RAN
• dc.subject.keyword Cell-free networks
• dc.subject.keyword Ultradense networks
• dc.subject.keyword Zero-forcing precoding
• dc.subject.keyword Pseudo-inverse
• dc.subject.keyword Generalized inverse
• dc.title Pseudo-Inverse vs generalized inverse for C-RAN downlink precoding
• dc.type info:eu-repo/semantics/conferenceObject
• dc.type.version info:eu-repo/semantics/acceptedVersion