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US 10,931,486 B2Granted
Transmitter, receiver 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.
Claims9
A transmitter that comprises:
- a set of first filters with outputs connected to a summing node;
- a set of upsamplers;
- a set of sub-band processors, wherein each sub-band processor comprises an interpolator, a cyclic shifter and a second filter;
- wherein each cyclic shifter is coupled between an interpolator and an upsampler;
- wherein each first filter follows an upsampler;
- wherein different interpolators are arranged to receive different sets of signals and perform up-sampling;
- wherein the set of first filters is arranged to output virtual sub-channels of information occupying disjoint spectral sub-bands;
- wherein each sub-band is associated with a pair of filters that comprises 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 interpolator comprises:
- a serial to parallel converter;
- a N point fast Fourier transform (FFT) module arranged to output N element vectors;
- a zero padding and circular shift module arranged to perform a zero padding operation and a circular shift operation on the N element vectors to provide V*N element circled vectors;
- a N*V point inverse FFT (IFFT) module;
- and
- a parallel to serial conversion and cyclic prefix adder coupled to an output of the N*V point IFFT module.
12 more elements
A transmitter that comprises:
- a set of first filters with outputs connected to a summing node;
- a set of upsamplers;
- a set of sub-band processors, wherein each sub-band processor comprises an interpolator, a cyclic shifter and a second filter;
- wherein each cyclic shifter is coupled between an interpolator and an upsampler;
- wherein each first filter follows an upsampler;
- wherein different interpolators are arranged to receive different sets of signals and perform up-sampling;
- wherein the set of first filters is arranged to output virtual sub-channels of information occupying disjoint spectral sub-bands;
- wherein each sub-band is associated with a pair of filters that comprises 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 virtual sub-channel of information that occupies a sub-band is an Orthogonal Frequency Division Modulation (OFDM) compliant sub-channel of information;
- wherein each interpolator is coupled to an OFDM transmitter module;
- wherein a combination of each interpolator and OFDM transmitter module comprises:
- a serial to parallel converter;
- a zero padding and circular shift module arranged to perform a zero padding operation and a circular shift operation on output vectors of the serial to parallel converter to provide zero padded and rotated vectors;
- an N*V point inverse FFT (IFFT) module;
- a parallel to serial conversion and cyclic prefix adder coupled to an output of the N*V point IFFT module.
12 more elements
Dependencies are inferred from the claim text.