Antimultipath communication by injecting tone into null in signa

Details Antimultipath communication by injecting tone into null in signa Antimultipath communication by injecting tone into null in signa

1985-05-02

1987-06-23

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 54, 375101, 375102, 455 65, 332 23A, H04L 512, H04B 110

Patent

active

046758801

ABSTRACT:
A transmitter for digital radio communication creates a null by balanced encoding of data modulated on an RF carrier, and inserts a calibration tone within the null. By having the calibration tone coincide in phase and frequency with the transmitted radio frequency output for coherent demodulation of data at the receiver where the tone calibration signal is extracted and used for multipath fading compensation.

REFERENCES:
patent: 3311442 (1967-03-01), de Jager et al.
patent: 3356947 (1967-12-01), Di Toro
patent: 3537008 (1970-10-01), Lakatos
patent: 3588702 (1971-06-01), Tisi et al.
patent: 3974450 (1976-08-01), Cunningham, Jr.
patent: 4019140 (1977-04-01), Swerdlow
patent: 4030033 (1977-06-01), Bibl et al.
patent: 4123711 (1978-10-01), Chow
patent: 4286334 (1981-08-01), Gammel et al.
patent: 4302817 (1981-11-01), Labedz
patent: 4383332 (1983-05-01), Glance et al.

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