Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Patent
1981-12-30
1983-10-25
Ng, Jin F.
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
455 52, 455 65, H04B 110, H04B 1500
Patent
active
044123507
ABSTRACT:
The fade character of a transmitted radio signal comprising an amplitude or phase modulated double-sideband signal is determined from the algebraic sign of the fade induced modulation and the location of the fade notch (.omega..sub.f) relative to the center (.omega..sub.c) of the double-sideband signal frequency spectrum. In the disclosed embodiment, the algebraic sign of the fade induced modulation is determined (e.g., 402, 403, 404, 405, 406, 409, 410, 411, 412, 413, 417) from the sign of the dc component of the product of the differentiated amplitude modulation and frequency modulation of the received signal. The relative location of the fade notch is determined by comparing the amplitudes (e.g., 402, 404, 405, 406, 415) of corresponding frequency components in each sideband of the received double-sideband signal.
REFERENCES:
patent: 3537008 (1970-10-01), Lakatos
patent: 3633107 (1972-01-01), Brady
patent: 4330764 (1982-05-01), Miedema
"A New Selective Fading Model: Application to Propagation Data", by W. D. Rummler, pp. 1037-1053, BSTJ, vol. 58, No. 5, May-Jun. 1979.
Bell Telephone Laboratories Incorporated
Ng Jin F.
Padnes David R.
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