US Patent No. 9,748,987

INTERFERENCE CANCELLATION SYSTEM FOR CANCELLING INTERFERENCE IN THE OPTICAL DOMAIN


Patent No. 9,748,987
Issue Date August 29, 2017
Title Interference Cancellation System For Cancelling Interference In The Optical Domain
Inventorship Elias Bonaventure Kpodzo, Franklin Park, NJ (US)
Robert Holland, Moorestown, NJ (US)
Yanhua Deng, Gainesville, FL (US)
Paul Prucnal, Princeton, NJ (US)
Andrew McCandless, Baton Rouge, LA (US)
Paul Dourbal, Princeton Junction, NJ (US)
Assignee L3 TECHNOLOGIES, INC., New York, NY (US)

Claim of US Patent No. 9,748,987

15. A method performed by an interference cancellation system (ICS), the method comprising:
receiving a first signal corresponding to an interferer signal and a second signal corresponding a combination of the interferer
signal and a signal of interest (SOI);

converting each of the first signal and the second signal from radio frequency (RF) signals to optical signals;
applying a 180 degree phase shift to one of the first signal or the second signal;
variably attenuating and variably time delaying one or more of the first signal and the second signal based on one or more
control signals received from a digital processor;

combining the first signal and the second signal into a combined signal after variably attenuating and variably time delaying
one or more of the first signal and the second signal; and

converting the combined signal from an optical signal to an RF signal;
sending the combined signal to a radio transceiver, wherein the control signals are generated based on a power level associated
with the combined signal.