H - Electricity – 04 – J
Patent
H - Electricity
04
J
H04J 1/02 (2006.01) H04L 25/02 (2006.01) H04L 27/26 (2006.01)
Patent
CA 2059455
A coherent demodulation device, for the demodulation of a digital signal of the type constituted by digital elements distributed in the time-frequency space and transmitted in the form of symbols constituted by a multiplex of N orthogonal carrier frequencies modulated by a set of the digital elements and broadcast simultaneously, the digital signal comprising reference elements, having a value and a position, in the time-frequency space, that are known to the demodulation device, comprising means for the estimation, by Fourier transform, of the frequency response of the transmission channel at any instant, carrying out the transformation of the received samples, corresponding to reference elements, from the frequency domain to the temporal domain, the multiplication in the temporal domain of the transformed samples by a rectangular temporal window (f n) and the reverse transformation, after the multiplication, of the obtained samples from the temporal domain into the frequency domain, the estimation means comprising means for the thresholding of the samples in the temporal domain, providing for the systematic elimination of the samples below a certain threshold.
Castelain Damien
Helard Jean-Francois
Le Floch Bernard
Rault Jean-Christophe
Blake Cassels & Graydon Llp
France Telecom
Telediffusion de France S.a.
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