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US 2017/0214558 A1Published application
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.
Claims44
A receiver that comprises:
- a first serial to parallel converter arranged to receive first digital signals that represent optical signals of a first polarity, and to output the first digital signals via multiple outputs;
- a first polyphase finite impulse response (FIR) filter array coupled between the first serial to parallel converter and to a first inverse fast Fourier transform (IFFT) module;
- a second serial to parallel converter arranged to receive second digital signals that represent optical signals of a second polarity, and to output the second digital signals via multiple outputs;
- a second polyphase finite impulse response (FIR) filter array coupled between the second serial to parallel converter and to a second (IFFT) module;
- and
- multiple sub-band processor modules;
- wherein each sub-band processor module is coupled to inputs of a same order of the first and second IFFT modules.
4 more elements
The receiver according to claim 9 wherein each sub-band impairment compensator comprises a cascade of an in-phase quadrature imbalance (IQI) compensator, a mixer and a delay unit.
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.
5 more elements
Dependencies are inferred from the claim text.