Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-01-17
2006-01-17
Vo, Don N. (Department: 2631)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S152000, C375S350000
Reexamination Certificate
active
06987797
ABSTRACT:
A non-parametric matched filter receiver that includes a digital (e.g., FIR) filter and a channel estimator. The channel estimator (1) determines the timing to center the digital filter, (2) obtains the characteristics of the noise in received samples, (3) estimates the system response for the samples using a best linear unbiased (BLU) estimator, a correlating estimator, or some other type of estimator, and (4) derives a set of coefficients for the digital filter based on the estimated system response and the determined noise characteristics. The correlating estimator correlates the samples with their known values to obtain the estimated system response. The BLU estimator pre-processes the samples to whiten the noise, correlates the whitened samples with their known values, and applies a correction factor to obtain the estimated system response. The digital filter then filters the samples with the set of coefficients to provide demodulated symbols.
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Fernandez-Corbaton Ivan Jesus
Jayaraman Srikant
Smee John
Baker Kent D.
Godsey Sandra L.
QUALCOMM Incorporated
Vo Don N.
Wadsworth Philip
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