Mojahedian, Mohammad MahdiMosayebi, RezaLozano Solsona, Angel2022-02-032022-02-032021Mojahedian 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/GLOBECOM42002.2020.9348123978-1-7281-8298-82576-6813http://hdl.handle.net/10230/52414Comunicació presentada a: GLOBECOM 2020 celebrat del 17 a l'11 de desembre de 2020 a Taipei, Taiwan.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.application/pdfeng© 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/GLOBECOM42002.2020.9348123info:eu-repo/semantics/conferenceObjecthttp://dx.doi.org/10.1109/GLOBECOM42002.2020.9348123C-RANCell-free networksUltradense networksZero-forcing precodingPseudo-inverseGeneralized inverseinfo:eu-repo/semantics/openAccess