Method and apparatus for combating adjacent channel interference

Details Method and apparatus for combating adjacent channel interference Method and apparatus for combating adjacent channel interference

1998-01-08

2000-04-04

Trost, William G.

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

455296, 455340, H04B 106

Patent

active

060471719

ABSTRACT:
A receiver includes at least two intermediate frequency (IF) filters, with the first IF filter and a second filter having a narrower bandwidth than the first bandwidth. The receiver also includes a switch operable to select between the IF filters. In use, the receiver measures the signal strength of adjacent channels to the signal strength of a desired channel and switches to the second IF filter with a narrower bandwidth when a ratio of the signal strength of the channel and the signal strength of adjacent channels is less than a predetermined threshold. The predetermined threshold is determined based on considerations of range of detection and adjacent channel interference. The bandwidth of the filters in the receiver is also designed to optimize performance in consideration of both range of detection and adjacent channel interference.

REFERENCES:
patent: 4907293 (1990-03-01), Ueno
patent: 5241697 (1993-08-01), Hansen
patent: 5303413 (1994-04-01), Braegas
patent: 5339455 (1994-08-01), Vogt et al.
patent: 5493717 (1996-02-01), Schwarz
patent: 5564093 (1996-10-01), Matsumoto
Website Abstract, Matsushita Elec Ind Co Ltd; (Matu;), Feb. 25, 1997, p. 1.
Website Abstract, General KK; (Genh;), Feb. 25, 1997, p. 1.
Website Abstract, Kenwood Corp; (TRIR;) Feb. 25, 1997, p. 1.

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