Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1985-02-21
1987-09-29
Griffin, Robert L.
Pulse or digital communications
Spread spectrum
Direct sequence
375106, 375114, 358146, H04L 700, H04N 700
Patent
active
046972773
ABSTRACT:
Synchronization between a transmitter and a receiver is effected by encoding and transmitting a synchronization pulse as a series of m first waveforms followed by a series of n second waveforms. The first and second waveforms are of the same duration and are transmitted in phase with each other; and m and n are positive real numbers, with m greater than one. The second waveform is different from, and preferably negatively correlated with, the first. When the receiver detects a series of first waveforms in the received signal, it locally generates a series of (either first or second) waveforms and correlates the locally-generated signal with the received signal. A change in correlation is detected as the synchronization pulse.
REFERENCES:
patent: 3576947 (1971-05-01), Kruger
patent: 3591720 (1971-07-01), Othmer
patent: 3757044 (1973-09-01), Verhoeckx et al.
patent: 3808367 (1974-04-01), Wigner et al.
patent: 3855576 (1974-12-01), Braun et al.
patent: 4001693 (1977-01-01), Stackhouse et al.
patent: 4131761 (1978-12-01), Giusto
patent: 4424532 (1984-01-01), den Toonder et al.
patent: 4468752 (1984-08-01), Chatham
patent: 4506372 (1985-03-01), Massey et al.
Griffin Robert L.
Huseman M.
Scientific - Atlanta, Inc.
LandOfFree
Synchronization recovery in a communications system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Synchronization recovery in a communications system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Synchronization recovery in a communications system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1592649