Method and apparatus for minimizing false detection of packet da

Details Method and apparatus for minimizing false detection of packet da Method and apparatus for minimizing false detection of packet da

1994-11-28

1995-12-05

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

375365, H04J 306

Patent

active

054736129

ABSTRACT:
A method and apparatus minimize false detection of packet data in a receiver (202) due to noise in a communication system (100) utilizing time slots (420). Some time slots (420) contain a data packet (418), while others contain only noise. The data packet (418) includes a sync word (602) and an error-detecting code word (604, 606, 608). The receiver (202) is synchronized (1006, 1008) with a nominal predetermined timing of the time slots (420), and determines (1014) time windows (808) for receiving the data packets (418). During each of the time windows (808) data is received, demodulated, and stored (1016), and a predetermined portion of the data stored is searched (1018) to locate a point of maximum correlation between the data and a data template (902) matching the sync word (602). The data packet (418) is decoded (1020) by utilizing the point of maximum correlation as a reference, and the code word (604, 606, 608) of the data packet (418) is examined (1022, 1024) to determine whether the data packet (418) is valid or invalid.

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patent: 5373536 (1994-12-01), Dehner, Jr. et al.
patent: 5402450 (1995-03-01), Lennen

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