Patent ID: 9503284
Filing Date: 2016-11-22
CPC Classification: H03H,H04B,H04L

Claim Text:
1. A receiver that comprises: a set of first filters that share a common input; a set of first downsamplers; a set of sub-band processors, the set of sub-band processors comprises a set of decimators each of which comprises a second filter, a frequency-shifter and a second downsampler; wherein input signals provided to the decimators are frequency shifted from each other; wherein the set of first downsamplers is coupled between the set of first filters and the set of sub-band processors; wherein the set of first filters is arranged to receive digital input signal via the common input and to output virtual sub-channels of information occupying disjoint spectral sub-bands; wherein each sub-band is associated with a first filter and a second filter, wherein the first filter has a milder frequency response outside the sub-band than a frequency response of the second filter outside the sub-band; wherein each first downsampler performs an L-factor downsampling, and wherein each decimator performs a V-factor downsampling; wherein L and V are positive rational numbers; wherein each decimator comprises: a serial to parallel conversion and a cyclic prefix drop module; a V*N point fast Fourier transform (FFT) module arranged to output V*N element vectors; an N point inverse FFT (IFFT) module; a parallel to serial converter coupled to an output of the N point IFFT module; and a circular shift module and sub-band extraction coupled between the V*N point FFT module and the N point IFFT module, the sub-band extraction and circular shift module is arranged to perform a circular shift operation on the V*N element output vectors to provide V*N element rotated vectors and to perform a sub-band extraction operation by extracting N elements from each V*N elements rotated vector, the N elements from each V*N elements rotated vector correspond to a single sub-band.