Signal cancellation using feedforward and feedback paths

JI Choi, S Hong, M Jain, S Katti, P Levis… - US Patent …, 2016 - Google Patents
A circuit that cancels a self-interference signal includes, in part, a pair of signal paths that are
substantially in phase, each of which paths includes a passive coupler, a delay element and …

Systems and methods for self-interference canceller tuning

D Bharadia, JI Choi, M Jain - US Patent 9,698,860, 2017 - Google Patents
A method for tuning an analog self-interference canceller includes detecting a tuning trigger,
calculating a set of tuning parameters (the tuning parameters including complex weights for …

Systems for delay-matched analog self-interference cancellation

JI Choi, M Jain - US Patent 9,520,983, 2016 - Google Patents
BACKGROUND Traditional wireless communication systems are half duplex; that is, they
are not capable of transmitting and receiving signals simultaneously on a single wireless …

Systems and methods for adaptively-tuned digital self-interference cancellation

RT Moorti, JI Choi, M Jain - US Patent 9,742,593, 2017 - Google Patents
(57) ABSTRACT A method for adaptively-tuned digital self-interference can cellation
comprises receiving a digital transmit signal; receiving a transform configuration; generating …

Systems and methods for near band interference cancellation

JI Choi, M Jain, D Bharadia, J Mehlman… - US Patent …, 2017 - Google Patents
A method for self-interference canceller tuning for a near band radio includes receiving, in a
first frequency band, an RF transmit signal of the near band radio; receiving, in a second …

Systems and methods for intelligently-tuned digital self-interference cancellation

RT Moorti, K Viswanatha - US Patent 10,103,774, 2018 - Google Patents
A system for digital self-interference cancellation includes a filter that generates a reduced-
noise digital residue signal; a channel estimator that generates a current self-interference …

Radio frequency self-interference-cancelled full-duplex relays

S Hong, J Mehlman, J Brand, JI Choi… - US Patent 10,177,836, 2019 - Google Patents
(57) ABSTRACT A relay including a first transmitter that converts a first digital transmit signal
to a first analog transmit signal, a first receiver that converts a first analog receive signal to a …

Systems and methods for phase noise mitigation

JI Choi, M Jain, J Mehlman, J Shalizi - US Patent 9,755,692, 2017 - Google Patents
A system for phase noise mitigated communication including a primary transmitter that
converts a digital transmit signal to an analog transmit signal, a primary receiver that …

Systems and methods for frequency-isolated self-interference cancellation

D Bharadia, J Mehlman, WS Hahn - US Patent 9,774,405, 2017 - Google Patents
A system for frequency-isolated self-interference cancellation includes a transmit coupler,
that samples an RF transmit signal to create a sampled RF transmit signal having a first RF …

Systems and methods for active interference cancellation to improve coexistence

A Kheirkhahi, S Abdollahi-Alibeik, L Nathawad… - US Patent …, 2015 - Google Patents
This disclosure is directed to systems and methods for providing active interference
cancellation in a wireless com munication device having a Bluetooth transmit chain and a …