Method for protected radio signal transmission

Details Method for protected radio signal transmission Method for protected radio signal transmission

1985-08-05

1992-12-01

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

380 34, H04L 2730

Patent

active

051685060

ABSTRACT:
In radio operation in tactical use, an increased jamming resistance with respect to intentional jamming is required. For protection against intentional jamming, frequency hopping techniques have proven very advantageous in which the signals are transmitted in the form of successive error-protected signal blocks where each signal block is transmitted on a different radio carrier frequency which changes in a pseudo-random manner. With this technique, phase shifts can occur which are greater than half a bit and therefore make analysis of the signal blocks difficult or impossible. It is proposed herein that each received signal block be checked after regeneration in a regenerative repeater, controlled by a bit clock pulse, as to its correct block phase and therefore, respectively, newly establish the block clock pulse phase required for further accurate processing of a signal block.

REFERENCES:
patent: 4361890 (1982-11-01), Green, Jr. et al.
patent: 4409684 (1983-10-01), Pooch et al.
patent: 4514852 (1985-04-01), Hanni et al.
patent: 4587662 (1986-05-01), Langewellpott
patent: 4598413 (1986-07-01), Szechenyi
patent: 4665533 (1987-05-01), Tomikawa
G. Baroker et al., "A Digitally Compensated TCXO"; Zie Voor Titel Boek, (pp. 191-198, no date given).

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