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US 2010/0166121 A1Published application
Methods and apparatus for receiver having fast walsh transform
AssigneeRaytheon Company
InventorLawrence M. Kenney, JR.
Life of this patent
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Abstract
Methods and apparatus for correlating a receiving signal using a Fast Walsh Transform for efficient processing. In one embodiment, a Walsh encoded signal is received and then processing using a Fast Walsh Transform to generate outputs from which a largest one of the orthogonal sequences is selected.
Claims13
A method, comprising:
- receiving a complex valued Walsh encoded signal in the in-phase and quadrature channels of a linear receiver processor;
- performing Fast Walsh Transform processing to generate estimates of a cross correlation of the received Walsh encoded signal with Walsh sequences separately in the in-phase and quadrature channels;
- combining the estimates of the in-phase and quadrature channel data using a magnitude approximation;
- selecting a first one of the data words from the combined estimates having a largest magnitude;
- decoding the encoded signal using the selected first one of the data words;
- and
- outputting the decoded signal.
4 more elements
A system, comprising:
- a receiver to receive a Walsh encoded input signal;
- an in-phase Fast Walsh Transform module to generate in-phase data words by performing Fast Walsh Transform processing for generating estimates of cross correlation of the received Walsh encoded input signal with Walsh sequences;
- a quadrature Fast Walsh Transform module to generate quadrature data words by performing Fast Walsh Transform processing for generating estimates of cross correlation of the received Walsh encoded input signal with Walsh sequences;
- a magnitude module to combine the respective in-phase data words from the in-phase module and the quadrature data words from the quadrature module for providing magnitude information for the data words;
- and
- a selection module to select a first one of the combined in-phase and quadrature data words having a greatest magnitude.
3 more elements
Dependencies are inferred from the claim text.