Cancellation of spurious intermodulation products produced in nonlinear channels by frequency hopped signals and spurious signals
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United States of America Patent
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Jun 12, 2018
Issued Date -
Dec 1, 2016
app pub date -
May 26, 2016
filing date -
May 27, 2015
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Abstract
A method and apparatus for intermodulation product (IMP) cancellation. In one embodiment, the method comprises: acquiring copies of source signals that create IMPs in a passband of interest; creating copies of the IMPs for use as IMP cancellation signals by either multiplying the source signals together as a series of digital samples such that the multiplied signals create a near real and continuous time copy of the IMPs or creating a sum of the source signals in near real and continuous time and convolving the sum of the source signals with a mathematical model to effectively multiply the signals together to create a copy of the IMPs; adjusting one or both of phase and amplitude of the copies; and using the copies to cancel the IMPs inband of the passband of interest.
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