Closed Loop Radio Interference Cancelation

Tech ID: 24028 / UC Case 2013-666-0

Patent Status

Country Type Number Dated Case
United States Of America Issued Patent 9,621,221 04/11/2017 2013-666

Brief Description

A key challenge in utilizing full-duplex radio is self-interference cancellation (SIC).  One component of SIC, transmission noise, severely limits full-duplex as no digital or hybrid methods has any built in mechanism to deal with transmission noise.  


General Diagram 




Full Description

University of California researchers have developed a closed-loop, digitally controlled and analog interfaced method for cancelling interferences from a set of RF transmit chains to a set of RF receive chains.  This novel analog-digital method is no longer limited by transmission noise.  The invention can be used to recover a weak signal in the presence of a stronger signal.  This method can be used in parallel or in serial for better combined effect.  The final structure of the system is such that all interference and major noise sources have a zero or minimum net contribution to the received digital signals.   




qAdapts to any condition of the noise which is part of the signal driving the adaptive digital filter. 
qVersatile method that can be applied to in various forms. 
qReduce interference at various stages in the receive chain. 
qMaximum possible signal-to-noise ratio.  

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Other Information


Full Duplex, Self Interference Cancellation, analog, digital, telecommunications

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