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US 11,677,484 B2Granted
Resource conserving weighted overlap-add channelizer
AssigneeHughes Network Systems, LLC
InventorHanhui Zhang
Life of this patent
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Abstract
Systems and methods are provided for channelizing. A first stage can provide a WOLA filter bank that can apply a single multiplier resource to perform window weighting for multiple WOLA filter banks. The first stage can remove mixer-based post FFT adjustment and provide equal functionality with a particular modification of tuning mixers at inputs of second stage FIR paths. The first stage can include a variable decimation, using a particular implementation of variable sample block size.
Claims20
A channelizer comprising:
- a weighting logic configured to apply a sequence of weighting coefficients to a sequence of signal samples, and output a corresponding sequence of weighted signal (WST) samples;
- a regrouping logic, configured to group the WST samples into a concatenation of D WST sample blocks, each of the D WST sample blocks including K WST samples, K being an integer;
- a time folding logic, configured to generate a first time-folded sum, based at least in part on a summation of the D WST sample blocks, and a second time-folded sum based at least in part on a summation of a first plurality of the D WST sample blocks and a subtraction of a second plurality of the D WST sample blocks;
- a mixer logic, configured to frequency shift the second time-folded sum and output a corresponding adjusted second time-folded sum;
- and
- transform logic configured to generate a first and second plurality of bandpass outputs based on at least in part the first time-folded sum and second adjusted time-folded sum.
3 more elements
A two stage channelizer comprising:
- a first stage channelizer configured to receive a sampling of an information frequency band and apply a first level channelization into plurality of sub-band streams;
- and
- a second stage configured to receive a selected sub-plurality, for example, integer N of the plurality of sub-band streams output from the first stage and apply a fine or second level channelization to recover desired frequency-division multiple access channel data for decoding;
- wherein the first stage channelizer further comprises:
- a weighting logic configured to apply a sequence of weighting coefficients to a sequence of signal samples, and output a corresponding sequence of weighted signal (WST) samples;
- a regrouping logic, configured to group the WST samples into a concatenation of D WST sample blocks, each of the D WST sample blocks including K WST samples, K being an integer;
- a time folding logic, configured to generate a first time-folded sum, based at least in part on a summation of the D WST sample blocks, and a second time-folded sum based at least in part on a summation of a first plurality of the D WST sample blocks and a subtraction of a second plurality of the D WST sample blocks;
- a mixer logic, configured to frequency shift the second time-folded sum and output a corresponding adjusted second time-folded sum;
- and
- transform logic configured to generate a first and second plurality of bandpass outputs based on at least in part the first time-folded sum and second adjusted time-folded sum.
7 more elements
Dependencies are inferred from the claim text.