Radio communication

Details Radio communication Radio communication

1991-03-14

1993-09-28

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 97, 455 321, 455 46, 455 47, 455 71, 4551641, 371 51, H04B 126

Patent

active

052492028

ABSTRACT:
In a transparent tone-in-band (TTIB) single-sideband-modulated communication system used to communicate digital data; to compensate for variations due, eg, to doppler shift of the pilot tone in the received signal, during the sweep of the frequency of a local oscillator used to tune the receiver, the output of a narrow band filter is monitored for the presence of the expected pilot tone. When the pilot tone appears to be present, the sweep is interrupted and the error rate of the demodulated digital signal is tested, the sweep being resumed if an excessive error rate is encountered.

REFERENCES:
patent: 3840811 (1974-10-01), Blouch
patent: 4009442 (1977-02-01), Bromssen
patent: 4434504 (1984-02-01), Fredrickson
patent: 4551855 (1985-11-01), Kurosaki et al.
patent: 4625331 (1986-11-01), Richardson
patent: 4792984 (1988-12-01), Matsuo
IEEE Transactions on Communication Technology, vol. COM 32, No. 1, Jan. 1984, New York, U.S. pp. 81-87, GcCeehan et al. "Phase-Locked Transparent Tone-In-Band (TTIB): A New Spectrum Configuration Particularly Suited to the Transmission of Data Over SSB Mobile Radio Networks".

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