Patent ID: 7149485

Claim:
A method for processing an incident analog signal modulated on N carriers, the method comprising: performing a frequency transposition of an intermediate signal arising from the incident analog signal on two phase quadrature processing paths for providing an analog transposed signal, the frequency transposition being based upon a predetermined transposition frequency; converting the analog transposed signal to a digital transposed signal; and demodulating the digital transposed signal using a Fourier transform of size N, the demodulating comprising a calibration phase for generating N calibration frequency signals before the frequency transposition, the N calibration frequency signals having N calibration frequencies respectively corresponding after transposition to N analysis frequencies being input to a Fourier transform circuit, and for each analysis frequency calculating an amplitude and a phase of a corresponding point at an output of the Fourier transform circuit, and a reception phase for correcting outputs of the Fourier transform circuit with an inverse of the corresponding amplitude and an opposite of the corresponding phase calculated in the calibration phase.