Abstract: A method of equalizing an OFDM signal received over a transmission channel defined by a channel matrix comprises: windowing the received signal in the time domain with at least two different tapers to obtain at least two tapered received signals; stacking the tapered received signals in the form of a joint matrix equation [ y 1 ? y ? ? y ? ] = [ D 1 ? D ? ? D ? ] ? y = [ D 1 ? D ? ? D ? ] ? ( Hx + ? ) with y being the received signal, ? being the number of tapers, D? being the ?th taper in form of a diagonal matrix, y? being the ?th tapered received signal, H being the channel matrix, x being the time domain transmitted signal, ? being optional noise; and solving said joint matrix equation for x as a least squares problem.

Abstract: The present invention relates to the field of analyzing the age and/or quality of certain natural products, for example foods. The invention also relates to devices for analyzing said age and/or quality as well as to methods for preparing such devices, to methods for analyzing natural products and to their use.