A device for estimating the difference in frequency between the carrier frequency of a signal, 1984, and the frequency of a local oscillator of reception, and the corresponding receiver

摘要

The invention relates to a device for estimating the frequency difference existing between the carrier frequency of a digital signal received and the frequency of a local oscillator signal in a receiver of the received signal. The receiver performs a quadrature demodulation of the received signal and the device comprises: & br / - means (27) for detecting the level of noise received in the band of the filters reception; & br / - means (21) of calculation of the discrete fourier transforms on the received signal is transposed into baseband; & br / - means (23) of the accumulation of energy detected on either side of the central frequency of the filters reception; & br / - means (30, 31) of the subtraction of the noise level to the energy bands; & br / - means (32 to 36) of the comparison of the resulting energy, these means (32 to 36) of comparison, providing an estimation (vepsilon) of the frequency difference.