Pizzo, AndreaLozano Solsona, Angel2023-02-012022Pizzo A, Lozano A. On Landau’s eigenvalue theorem for line-of-sight MIMO channels. IEEE Wirel Commun Lett. 2022;11(12):2565-9. DOI: 10.1109/LWC.2022.32083222162-2337http://hdl.handle.net/10230/55584An alternative derivation is provided for the degrees of freedom (DOF) formula on line-of-sight (LOS) channels via Landau’s eigenvalue theorem for bandlimited signals. Compared to other approaches, Landau’s theorem provides a general framework to compute the DOF in arbitrary environments, this framework is herein specialized to LOS propagation. The development shows how the spatially bandlimited nature of the channel relates to its geometry under the paraxial approximation that applies to most LOS settings of interest.application/pdfeng© 2022 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/LWC.2022.3208322info:eu-repo/semantics/articlehttp://dx.doi.org/10.1109/LWC.2022.3208322Degrees of freedomLine-of-sight MIMOParaxial approximationLandau’s eigenvalue theoreminfo:eu-repo/semantics/openAccess