Synchronization for entry to a network in a frequency hopping co

Details Synchronization for entry to a network in a frequency hopping co Synchronization for entry to a network in a frequency hopping co

1989-10-16

1992-06-09

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

370 50, 375 40, 375100, 375115, 455 511, 455 71, 4551611, 4551651, 4551661, H04L 2730

Patent

active

051214083

ABSTRACT:
Synchronization of a frequency hopping transceiver to a network by embedding synchronization codes in the pseudo-random frequency hopping transmission sequence. A receiver is implemented with a frequency detector and a correlator to generate a correlator signal in response to the synchronization codes in the pseudo-random frequency hopping transmission sequence. Detection of a peak in the correlator signal is indicative of synchronization of the receiver with the network. The network entry synchronization scheme is such that, when two transceivers A and B are communicating, a third unnetworked transceiver C extracts the hidden network entry code pattern from the A-B transmission in order to enter the network. As a part of the communication between the two transceivers A and B, transceiver A transmits a known pattern as a hidden part of the communication which allows transceiver C to enter the A-B network. This hidden code pattern permits rapid synchronization and correction of large initial time errors, and permits correction of time drift from then on.

REFERENCES:
patent: 4677617 (1987-06-01), O'Connor et al.
patent: 4761796 (1988-08-01), Dunn et al.
patent: 4780885 (1988-10-01), Paul et al.
Evangelos Kranakis, Primality and Cryptography; (John Wiley & Sons, New York, 1986; Section 4.1, pp. 98-99).

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