2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/128899We derive a criterion on the measurability / identifiability of Multiple--Input Multiple--Output (MIMO) channels based on the size of the so-called spreading support of its subchannels. Novel MIMO transmission techniques provide high-capacity communication channels in time-varying environments and exact knowledge of the transmission channel operator is of key importance when trying to transmit information at a rate close to channel capacity.Functional AnalysisClassical Analysis and ODEs42C15, 47G30,94A20,94A30text