Receiver in a frequency hopping communication system

Details Receiver in a frequency hopping communication system Receiver in a frequency hopping communication system

1982-03-22

1984-03-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375115, 455266, H04K 100, H04L 900

Patent

active

044358210

ABSTRACT:
A frequency hopping spread spectrum demodulator includes a broad band filter covering the spread spectrum bandwidth and a narrow band filter which can be selected to pass any one of a number of subbands making up the spread spectrum bandwidth. The filter is switched from broad to narrow band in response to determination of synchronization acquisition. Synchronization acquisition itself is accomplished in one embodiment by summing the outputs from a plurality of channels each selectively receiving one of a number of predetermined hopping frequencies, and threshold-comparing the summed signal to test for synchronization. In an alternate configuration, the received signal and a local reference signal are correlated, the correlated signal is integrated, and the integrated signal is then compared to a threshold, with synchronization being determined when an output from either one of the threshold comparator or integrator is present.

REFERENCES:
patent: 3932705 (1976-01-01), Wulleman
patent: 4039749 (1977-08-01), Gordy et al.
patent: 4215239 (1980-07-01), Gordy et al.
patent: 4365330 (1982-12-01), Chopping et al.
Ing et al., "Mean Acquisition Time of Active and Passive-Correction Acquisition System for Spread-Spectrum Communication System" IEEE Proceeding, vol. 128, No. 4, Aug. 1981, pp. 211-213.

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