Detection

Details Detection Detection

2004-06-24

2008-12-02

Payne, David C (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S142000, C375S260000

Reexamination Certificate

active

07460621

ABSTRACT:
In a method and apparatus for detecting a message in a signal the message begins with a preamble consisting of a fixed sequence of symbols, each having a symbol time T, modulated by repetitions of a higher rate code having low autocorrelation at lags anything other than zero. The repetitive code and the fixed sequence of symbols is known at the detector. The method comprises correlating the signal with the repetitive code; autocorrelating the signal with a copy of the signal, which is delayed substantially a symbol time; correlating the signal with the preamble; and indicating the detection of a message if a value in the signal is greater than a threshold value.

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patent: 0 851 602 (1997-12-01), None
patent: WO 01/28146 (2001-04-01), None

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