Subject: [NEXTEL-1] Method and apparatus for eliminating intermodulation

From: [email-masked]
Date: Sun, 29 Jun 2003 06:53:34 -0400

Method and apparatus for eliminating intermodulation

June 26, 2003 6:05pm

Patent Number 6584081
Issue Date    2003 06 24
Assignee      Cellco Partnership
Inventor(s)   Lee, William Chien-Yeh
Farrill, F. Craig

State/Country CA

Title         Method and apparatus for eliminating intermodulation
interference in cellular telephone systems

Abstract      The invention describes method and apparatus for reducing
intermodulation interference caused by reception of
undesired signals in wireless receivers. The apparatus
comprises an antenna for receiving the desired signal, a low
noise amplifier for amplifying this signal, an adjustable
attenuator, and a transmitting antenna to transmit the
amplified signal to the wireless receiver. By increasing the
strength of the desired signal, the present invention
eliminates intermodulation distortion caused by the
undesirable signals. The invention also describes an
apparatus further comprising an adjustable filter for
limiting the spectral content of the transmitted amplified
signal, and an apparatus for selecting the characteristics
of the adjustable filter in accordance with the measured
characteristics of the desired and undesired signals.

Exmp. Claim   1
Ex Claim text An apparatus for reducing intermodulation interference from
an external signal transmitted from an external transmitter,
comprising:
a first antenna for receiving signals comprising duplex
communications having a forward channel signal transmitted
over a forward channel from a base transceiver and a reverse
channel signal transmitted over a reverse channel by a
wireless transceiver;
a signal generator, coupled to the first antenna, comprising
a filter for passing the forward channel signal and for
rejecting reverse channel signal, and an amplifier, coupled
to the filter, for amplifying the filtered signal;
a second antenna, coupled to the amplifier, for transmitting
the amplified and filtered signal to the wireless
transceiver to reduce intermodulation interference in the
wireless transceiver from the external signal; and
wherein the second antenna is disposed proximate to the
external transmitter.

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