Preamble detection using low-complexity cross-correlation

Details Preamble detection using low-complexity cross-correlation Preamble detection using low-complexity cross-correlation

2011-03-01

2011-03-01

Payne, David C (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000

Reexamination Certificate

active

07899107

ABSTRACT:
A system includes a differential demodulation module that differentially demodulates modulated signals. A cross-correlation module generates cross-correlation values by cross-correlating states of X symbols in the differentially demodulated signals with corresponding states of X predetermined symbols in each of Y preamble sequences, and determines whether one of the Y preamble sequences is present in the modulated signals, where X and Y are integers greater than 1. The cross-correlation module includes a state detection module that detects the states of the X symbols in the differentially demodulated signals, where each of the X symbols has one of a first state and a second state, and a summing module that generates the cross-correlation values by generating X sums for each of the Y preamble sequences by adding each of the states of the X symbols with the corresponding states of the X predetermined symbols in each of the Y preamble sequences.

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