Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2006-04-11
2006-04-11
Chin, Stephen (Department: 2634)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S350000
Reexamination Certificate
active
07027534
ABSTRACT:
Techniques are provided for fine-tuning estimates of a delay value for a sampled signal. One aspect of the invention is to perform, for the sampled signal, coarse-grained calculations of the In Phase and Quadrature (I and Q) correlation integrals at a limited number of points, wherein the calculations are performed over a range of hypothesized delay values. A range of delay values of interest are then determined from the coarse-grained calculations of the I and Q correlation integrals. A subset of I and Q values based on the coarse granularity calculations of the I and Q correlation functions is used to perform a time-domain interpolation to obtain fine-grained values of the I and Q integrals in the range of the delay values of interest. Magnitude calculations are performed based on the fine-grained values of the I and Q integrals. Fine-tuned estimates of delay value are based on the magnitude calculations. Alternatively, fine-tuned estimates of delay value are based on the template-matching approach.
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Casadei Stefano
Chou Andrew
Roy Benjamin Van
Sahai Anant
Stone Jesse Robert
Chin Stephen
Kwok Edward C.
Lu Jia
MacPherson Kwok & Chen & Heid LLP
SiRF Technology Inc.
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