Distributed analog-digital frequency dehopping system

Details Distributed analog-digital frequency dehopping system Distributed analog-digital frequency dehopping system

1996-11-22

1999-04-27

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375202, 375200, 370343, 370480, 455 59, H04B 1500, H04K 100, H04L 2730, H04J 100

Patent

active

058987282

ABSTRACT:
A system and method for frequency dehopping of spread spectrum communication signals includes a downconverter having two mixer stages, each mixer stage providing coarse frequency dehopping. The local oscillator injection frequency of each mixer stage is selectable by way of a plurality of relatively easily generated tones. The output of the second mixer stage is sampled by an analog-to-digital converter to enable fine tuning dehopping to be performed in the digital domain and subsequently demodulated in a demodulator circuit.

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K. Defly, X. Wang, G. Wu, M. Lecours, "Synchronization in FH-MFSK Spread Spectrum Systems", IEEE 38th Vehicular Technology Conference, Jun. 15, 1988.

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