Telecommunications – Receiver or analog modulated signal frequency converter – Plural receivers
Patent
1979-08-13
1982-01-26
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Plural receivers
455203, 455235, 455304, 455306, H04B 110
Patent
active
043132111
ABSTRACT:
Effects of multipath fading and Doppler frequency spread in a single sideband radio communication system are largely overcome by separating (17) from a received signal spectrum, a pilot frequency component including those effects and using that component to accomplish both phase (36) and gain (38) corrections on an information-containing frequency component. Signals essentially free of those effects are provided (10) for controlling necessary frequency translations in the receiver. One illustrative embodiment (FIG. 4) is conveniently arranged for facilitating diversity signal combining.
REFERENCES:
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patent: 3634766 (1972-01-01), Boyer
"An Experimental Fast Acting AGC Circuit"-A. L. Hopper, Mar. 1962, IRE Int. Conv. Record, vol. 10, Part 8, pp. 13-20.
"Direct Conversion S.S.B. Receivers: A Comparison of Possible Circuit Configurations for Speech Communication"-S. R. Al-Araji et al.-Radio and Electronic Engineer, vol. 43, No. 3, Mar. 1973, pp. 209-215.
Microwave Mobile Communications-John Wiley & Sons-Edited by W. C. Jakes, Jr., 1974, pp. 200-207, Article "Mobile Radio Systems-Modulation, Noise, and Interference-Comparison with S.S.B. and FM".
"Forward Feeding A.G.C. with Extended Signal Delays"-Rawling et al.-IERE Conference Proceedings, No. 40, Jul. 1978, pp. 85-92.
"Receiver for the Wolfson SSB/VHF Land Mobile Radio System"-Gosling et al., IERE Conference Proceedings, No. 40, Jul. 1978, pp. 169-178.
"AGC, AFC, Tone Select Circuits for Narrow Band Mobile Radio"-Lusignan-Intelcom '79, Dallas, Texas, Feb. 1979, pp. 1-4.
"The Potential of SSB for Land Mobile Radio"-Gibson et al.-29th IEEE Vehicular Technology Conference, Twenty-Ninth Annual Conf., Arlington Heights, Ill. Mar. 27-30, 1979, pp. 90-94.
Bell Telephone Laboratories Incorporated
Bookbinder Marc E.
Phelan Charles Scott
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