Method of and apparatus for filtering intermodulation products in a radiocommunication system
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United States of America Patent
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Jan 19, 1999
Grant Date -
N/A
app pub date -
Aug 27, 1996
filing date -
Aug 27, 1996
priority date (Note) -
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Abstract
An improved feed-forward multi carrier power amplifier architecture is described along with a novel array antenna wherein the improved amplifier may be advantageously put to use. The improved amplifier provides for independent control of unwanted intermodulation products generated in the amplifier. When used in the novel array structure, a separate radiation lobe containing the unwanted intermodulation products may be steered independently from a main radiation lobe. In a cellular base station application, the radiation lobe containing the unwanted intermodulation products may be steered away from the main radiation lobe thereby providing spatial filtering of the unwanted signals. The radiation lobe containing the unwanted intermodulation products may be steered rapidly in time using, for example, a noise like function to provide statistical averaging of the interference in the direction of desired communications.
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