Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1997-06-27
2000-05-02
Vo, Don N.
Pulse or digital communications
Receivers
Interference or noise reduction
455296, H04B 110
Patent
active
060581484
ABSTRACT:
An adaptive intermediate frequency bandwidth control system detects IF signal levels both before and after channel filtering. The two levels are compared to provide a measure of the presence of interfering adjacent channels. This measure is compared to a programmable threshold and the IF bandwidth is narrowed if any interferers are detected. Digital FIR or IIR filtering is used. The invention allows bandwidth switching to be done very quickly with minimal transient effects. A difference threshold is selected depending upon the IF channel bandwidth being used at any given time.
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Simon Haykin, An Introduction to Analog and Digital Communications, 1989, pp. 281-283.
Difiore Nicholas Lawrence
Hagan Christopher John
Wagner John William
Wargnier James Alfred
Whikehart J. William
Ford Motor Company
Mollon Mark L.
Phu Phuong
Vo Don N.
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