Attarifar, MasoudAbbasfar, AliazamLozano Solsona, Angel2019-04-112019-04-112018Attarifar M, Abbasfar A, Lozano A. Random vs structured pilot assignment in cell-free massive MIMO wireless networks. In: 54th IEEE International Conference on Communications; 2018 May 20-24; Kansas City, USA. New Jersey: Institute of Electrical and Electronics Engineers; 2018. [6 p.]. DOI: 10.1109/ICCW.2018.8403508http://hdl.handle.net/10230/37089This paper addresses the performance improvement that structured pilot assignment policies can bring about, relative to a random pilot assignment, in cell-free massive MIMO wireless networks. It is shown that structured policies can deliver a multiple-fold reduction in the pilot overhead required to keep pilot contamination at some acceptably low level. While the implementation of the structured policies considered in the paper might require some degree of centralized control, their performance also captures what distributed nonrandom pilot assignment schemes (e.g., greedy or collision-detecting algorithms) can hope to approach.application/pdfeng© 2018 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/ICCW.2018.8403508info:eu-repo/semantics/conferenceObjecthttp://dx.doi.org/10.1109/ICCW.2018.8403508Signal to noise ratioMIMO communicationInterferenceContaminationFading channelsAntennasChannel estimationinfo:eu-repo/semantics/openAccess