Method and apparatus for distinguishing between minimum and non-

Details Method and apparatus for distinguishing between minimum and non- Method and apparatus for distinguishing between minimum and non-

1981-12-07

1983-09-06

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

455 52, 455 65, 455306, H04B 110

Patent

active

044033516

ABSTRACT:
The fade character of a received double-sideband, phase coherent signal is determined from the location of the fade notch frequency, (.omega..sub.F) relative to the center (.omega..sub.c) of the received signal frequency spectrum and the phase between fundamental components of first (P.sub.1) and second (P.sub.2) product signals. These product signals are derived (401, 403, 411, 413, 419, 420, 421 or 801, 802, 803, 805, 811) using first (.omega..sub.1) and second (.omega..sub.2) spectral components that are symmetrically disposed about the center of the received signal frequency spectrum. The fundamental components of each product signal are at a common frequency.

REFERENCES:
patent: 3452156 (1969-06-01), Engelbrecht
patent: 3537008 (1970-10-01), Lakatos
patent: 4281411 (1981-07-01), Bonn et al.
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.

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