Mosayebi, RezaMojahedian, Mohammad MahdiLozano Solsona, Angel2021-05-132021-05-132021Mosayebi R, Mojahedian MM, Lozano A. Linear interference cancellation for the cell-free C-RAN uplink. IEEE Trans Wirel Commun. 2021;20(3):1544-56. DOI: 10.1109/TWC.2020.30342691536-1276http://hdl.handle.net/10230/47549Drawing on the notion of parallel interference cancellation, this paper formulates a one-shot linear receiver for the uplink of centralized, possibly cloud-based, radio access networks (C-RANs) operating in a cell-free fashion. This receiver exhibits substantial interference rejection abilities, yet it does not involve any matrix inversions; rather, its structure hinges on the pairwise projections of the users' channel vectors. Its performance is markedly superior to that of matched-filter beamforming, while the computational cost is decidedly inferior to that of an MMSE filter, altogether constituting an attractive alternative in terms of performance vs cost. Furthermore, with a proper sparsification of the channel matrix that it estimates and processes, the proposed receiver can be rendered scalable in the sense of its computational cost per access point not growing with size of the network. Uplink power control is also readily accommodated.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/TWC.2020.3034269info:eu-repo/semantics/articlehttp://dx.doi.org/10.1109/TWC.2020.3034269C-RANCell-free networksUltradense networksParallel interference cancellationPower controlinfo:eu-repo/semantics/openAccess