FBMC receiver with carrier frequency offset compensation

A receiver of a filter bank multicarrier (FBMC) signal synthesised with a bank of N synthesis filters having an overlap factor K, said receiver comprising:

• an FFT module of size KN in order to effect an FFT on a block of KN samples of said signal, after baseband demodulation, and to supply a block of KN samples in the frequency domain, corresponding to KN subcarriers:
• a filtering module per bank of N analysis and spectral de-spreading filters in the frequency domain, said receiver also comprising:
• an estimator for estimating the carrier frequency offset between the carrier frequency of the signal and the baseband demodulation frequency of the receiver;
• a shift module downstream of the FFT module shifting the samples at the output of the FFT by a predetermined number of samples according to the carrier frequency offset estimated by said estimator;
• an interference reduction filter in order to reduce the interference between subcarriers by means of a multiplication by a matrix (W) having a band of non-zero coefficients of width 2Q+1, around the main diagonal, with Q<K, and zeroes everywhere else, said interference reduction filter operating on blocks of samples at the output of the shift module and supplying them to the filtering and spectral de-spreading module.