Method and apparatus for eliminating intermodulation interference in cellular telephone systems

A method of reducing intermodulation interference from an external signal received from an external transmitter, comprising the steps of:

• receiving signals comprising communications from the base transceiver, the duplex communications comprising a forward channel signal transmitted over a forward channel by a base transceiver and a reverse channel signal transmitted over a reverse channel by a wireless receiver;
• filtering the received signals to pass the forward channel signal and to reject the reverse channel signal;
• amplifying the filtered signal;
• and
• transmitting the filtered and amplified signal to the wireless transceiver from an antenna disposed proximate to the external transmitter to reduce intermodulation interference in the wireless transceiver from the external signal.

A system for reducing intermodulation interference in a wireless receiver during reception of a first signal, comprising:

• a first antenna for receiving a first signal from a first source and an interfering second signal from a second source having a location relative to the first source defining an interference region;
• a filter for passing the first signal and for rejecting the second signal, coupled to the first antenna;
• an amplifier, coupled to the filter, for amplifying the filtered signal;
• and
• a second antenna, coupled to the amplifier, and located within the interference region, for transmitting the amplified and filtered first signal to the wireless receiver to reduce interference in the wireless receiver caused by the second signal.

An apparatus for reducing intermodulation interference in a wireless receiver during reception of a first signal transmitted by a first source in the presence of a second signal transmitted by a second source, wherein a relationship between the first source and the second source describe an interference region, comprising:

• a first antenna;
• a filter for passing the first signal and rejecting the second signal, the filter coupled to the first antenna;
• an amplifier, coupled to the filter, for amplifying the filtered signal;
• and
• a second antenna, coupled to the amplifier, and disposed within the intermodulation interference region, for transmitting the amplified and filtered signal to the wireless receiver to reduce interference in the wireless receiver from the second signal.

A method for reducing interference in a wireless receiver during reception of a first signal transmitted by a first source in a first location in the presence of a second signal transmitted by a second source in a second location, wherein a relationship between the first source and the second source defines an interference region, comprising the steps of:

• receiving the first signal and the second signal;
• filtering the received first signal and the received second signal, to substantially pass the first signal and substantially reject the second signal;
• amplifying the filtered signal;
• and
• transmitting the filtered and amplified signal from within the interference region.