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US 5,966,411 AGranted
Multipath equalization using taps derived from a parallel correlator
AssigneeAlcatel USA Sourcing, L.P.
InventorPaul F. Struhsaker
Life of this patent
Estimating the term…
Abstract
A communication system (10) includes a central terminal (12) and a subscriber terminal (14) that communicate information through an air interface (16). A receiver (22) suitable for deployment in either the central terminal (12) or the subscriber terminal (14) includes a parallel correlator (120), a weighting module (140), and a summer (180) that provide acquisition, equalization, and tracking functions.
Claims20
A communications system, comprising:
- a transmitter operable to generate a transmitted signal;
- and
- a receiver operable to receive the transmitted signal, the receiver comprising:
- an input module operable to convert the transmitted signal into in-phase and quadrature-phase components;
- a code module operable to generate a plurality of codes;
- a plurality of correlators coupled to the code module, each of the plurality of correlators operable to correlate each of the in-phase and quadrature-phase components of the transmitted signal and an associated one of the plurality of codes to generate associated in-phase and quadrature-phase correlator outputs, each of the associated in-phase and quadrature-phase correlator outputs indicating a measure of the correlation between its respective in-phase and quadrature-phase components and their associated one of the plurality of codes;
- a plurality of multipliers coupled to each correlator, each multiplier operable to receive its associated in-phase and quadrature-phase correlator outputs;
- a weighting module coupled to the plurality of multipliers, each multiplier operable to multiply each of the associated in-phase and quadrature-phase correlator outputs by an associated one of a plurality of weights to generate a plurality of in-phase and quadrature-phase tap values;
- and
- a summer coupled to each multiplier, the summer operable to sum the in-phase and quadrature-phase tap values to generate an in-phase and a quadrature-phase estimate.
7 more elements
A receiver operable to process a transmitted signal, the receiver comprising:
- an input module operable to convert the transmitted signal into in-phase and quadrature-phase components;
- a code module operable to generate a plurality of codes;
- a plurality of correlators coupled to the code module, each of the plurality of correlators operable to correlate each of the in-phase and quadrature-phase components of the transmitted signal and an associated one of the plurality of codes to generate associated in-phase and quadrature-phase correlator outputs, each of the associated in-phase and quadrature-phase correlator outputs indicating a measure of the correlation between its respective in-phase and quadrature-phase components and their associated one of the plurality of codes;
- a plurality of multipliers coupled to each of the plurality of correlators, each multiplier operable to receive its associated in-phase and quadrature-phase correlator outputs;
- a weighting module coupled to the plurality of multipliers, each multiplier operable to multiply each of its associated in-phase and quadrature-phase correlator outputs by an associated one of a plurality of weights to generate a plurality of in-phase and quadrature-phase tap values;
- and
- a summer coupled to each multiplier, the summer operable to sum the plurality of in-phase and quadrature-phase tap values to generate an in-phase and a quadrature-phase estimate.
4 more elements
A method for processing a transmitted signal having a symbol, the method comprising:
- converting the transmitted signal into in-phase and quadrature-phase components;
- combining, using a plurality of correlators, at least a portion of the symbol of each of the in-phase and quadrature-phase components and an associated one of a plurality of codes to generate a plurality of in-phase and quadrature-phase correlator outputs, each of the plurality of in-phase and quadrature-phase correlator outputs indicating a measure of the correlation between its respective in-phase and quadrature-phase components and their associated one of the plurality of codes;
- using a plurality of multipliers, each of the plurality of in-phase and quadrature-phase correlator outputs by an associated one of a plurality of weights to generate a plurality of in-phase and quadrature-phase tap values;
- and
- summing the plurality of in-phase and quadrature-phase tap values to generate an in-phase and quadrature-phase estimate.
2 more elements
Dependencies are inferred from the claim text.