Circuit and method for tracking finger off-set in a spread-spectrum rake receiver and wireless infrastructure employing the same
First Claim
Patent Images
1. A finger tracking circuit for a rake receiver, comprising:
- a timing error subcircuit that determines a timing error in a current power control group (PCG) of a carrier signal to be tracked; and
a feedback subcircuit that applies a gain signal that is a function of a data rate and a signal-to-noise ratio (SNR) of said carrier signal to said timing error subcircuit, a convergence rate of said finger tracking circuit therefore depending on said data rate of said carrier signal.
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Abstract
A finger tracking circuit for a rake receiver, a method of tracking a carrier signal and a wireless infrastructure. The finger tracking circuit includes: (1) a timing error subcircuit that determines a timing error in a current power control group ("PCG") of a carrier signal to be tracked and (2) a feedback subcircuit that applies a gain signal that is a function of a data rate of the carrier signal and a signal-to-noise ratio ("SNR") to the timing error subcircuit, a convergence rate of the finger tracking circuit therefore depending on the data rate of the carrier signal.
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Citations
21 Claims
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1. A finger tracking circuit for a rake receiver, comprising:
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a timing error subcircuit that determines a timing error in a current power control group (PCG) of a carrier signal to be tracked; and a feedback subcircuit that applies a gain signal that is a function of a data rate and a signal-to-noise ratio (SNR) of said carrier signal to said timing error subcircuit, a convergence rate of said finger tracking circuit therefore depending on said data rate of said carrier signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of tracking a finger for a rake receiver, comprising the steps of:
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determining a timing error in a current power control group (PCG) of a carrier signal to be tracked; and applying a gain signal that is a function of a data rate and a signal-to-noise ratio (SNR) of said carrier signal to said timing error subcircuit, a rate of convergence on said carrier signal therefore depending on said data rate of said carrier signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A wireless Code Division Multiple Access (CDMA) infrastructure, comprising:
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a plurality of base stations that cooperate by communicating via wire-based interconnections therebetween; a plurality of rake transceivers, associated with said plurality of base stations, that communicate wirelessly with at least one mobile station via carrier signals carried on a plurality of spread-spectrum fingers; and a plurality of finger tracking circuits, associated with said plurality of rake transceivers, that track at least one of said carrier signals, each of said plurality of finger tracking circuits including; a timing error subcircuit that determines a timing error in a current power control group (PCG) of said at least one of said carrier signals, and a feedback subcircuit that applies a gain signal that is a function of a data rate and a signal-to-noise ratio of said carrier signal to said timing error subcircuit, a convergence rate of said finger tracking circuit therefore depending on said data rate of said carrier signal. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification