Multiplex communications – Wide area network – Packet switching
Patent
1991-01-16
1992-12-08
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 953, 4552001, 4552341, 455295, 375 98, H04J 116, H04B 106, H04B 7204
Patent
active
051703920
ABSTRACT:
A receiver 200 automatically compensates for intermodulation of an input signal. The receiver 200 is preceded by a receiver front-end 105 which is coupled to antennas 100-102 receiving the signal. The gain of the antenna path/frequency is calibrated and stored for all combinations of antenna path/frequency. When a signal is received, the receiver 200 determines the correct stored gain factor representing the antenna receiving the signal and the frequency of the signal. The gain factor is compared against a predetermined threshold, and if the gain factor is greater than the threshold, an attenuator 400 placed at the front of the receiver 200 is inserted to optimize signal intermodulation. If the gain factor less than the threshold, the attenuator 400 is bypassed to optimize the sensitivity of the receiver 200.
REFERENCES:
patent: 4222118 (1980-09-01), Dickinson et al.
patent: 4330859 (1982-05-01), Takada
patent: 4355414 (1982-10-01), Inoue
patent: 5029162 (1991-07-01), Epps
"Receiver System Matches Channels from 6 to 18 GHz", Microwaves & RF, Mar. 1989, pp. 127-132--describes a phase-matched receiver having programmable attenuations as shown in FIG. 5, pp. 130-131.
Jenski Raymond A.
Kizou H.
Motorola Inc.
Olms Douglas W.
Sonnentag Richard A.
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