Method and apparatus for establishing synchronization with a...

Details Method and apparatus for establishing synchronization with a... Method and apparatus for establishing synchronization with a...

2000-11-10

2004-12-28

Liu, Shuwang (Department: 2634)

Pulse or digital communications

Synchronizers

C375S149000, C375S364000, C375S365000, C370S337000, C370S342000

Reexamination Certificate

active

06836520

ABSTRACT:

FIELD OF THE INVENTION
This invention relates in general to wireless communication systems, and more specifically to a method and apparatus for establishing synchronization with a synchronization signal.
BACKGROUND OF THE INVENTION
A digital communication receiver must establish synchronization with a received signal before decoding the information in the received signal. One synchronization technique has been to perform a plurality of cross-correlations between a known synchronization pattern and the received signal, each cross-correlation calculated for a different portion of the received signal, until a point of highest correlation is detected.
Some systems, such as Bluetooth, utilize rather lengthy synchronization signals, causing a straightforward calculation of the cross-correlation values to require large amounts of memory and processing. Such a requirement is undesirable, especially in portable, battery-powered devices.
Thus, what is needed is an efficient method and apparatus for establishing synchronization with a received signal. Preferably, the method and apparatus will not require large amounts of memory and processing.


REFERENCES:
patent: 5590160 (1996-12-01), Ostman
patent: 5732114 (1998-03-01), Thebault et al.
patent: 5949817 (1999-09-01), Marshall
patent: 6424673 (2002-07-01), Chen et al.

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