Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-05-15
2007-05-15
Payne, David C. (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S152000, C375S340000
Reexamination Certificate
active
10423655
ABSTRACT:
The present invention provides an efficient means of estimating symbols transmitted in a multi-user environment in overloaded or super-saturated conditions by employing a deferred decorrelating decision feedback detector. In one embodiment, the present invention comprises a parameter estimation unit, filter bank, overloaded whitener and decision tree-based hypothesis testing. Parameter estimation defines the matched filter bank, whitening filters, and the terms of the hypothesis testing module. The whitening filter partially decouples co-channel interference and partially whitens the noise. The decision tree approach defers decisions until more evidence is accumulated and is a generalization that encompasses the jointly optimal maximum likelihood detector as well as the simpler decision feedback detectors.
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BAE Systems Information and Electronic Systems Integration Inc.
Ettehadieh Aslan
Maine & Asmus
Payne David C.
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