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US 9,503,284 B2Granted
Receiver, transmitter and a method for digital multiple sub-band processing
AssigneeTechnion Research & Development Foundation Limited
InventorsMoshe Nazarathy, Alex Tolmachev
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Abstract
Highly efficient digital domain sub-band based receivers and transmitters.
Claims15
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.
13 more elements
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 virtual sub-channel of information that occupies a sub-band is an Orthogonal Frequency Division Modulation (OFDM) compliant sub-channel of information;
- wherein each decimator is coupled to an OFDM receiver module;
- wherein a combination of each decimator and OFDM receiver module forms a sub-band processor comprising:
- 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;
- a parallel to serial converter;
- and
- a sub-band extraction and circular shift module coupled between the V*N point FFT module and the parallel to serial converter, that is arranged to perform a circular shift operation on the V*N element output vectors to provide V*N element circled vectors and to perform a sub-band extraction operation by extracting N elements from each V*N elements circled vector, the N elements corresponding to a single sub-band.
14 more elements
Dependencies are inferred from the claim text.