Patent ID: 9391667
Filing Date: 2016-07-12
CPC Classification: H04B

Claim Text:
1. A method, in a radio transceiver configured to transmit a radio-frequency transmit signal at a transmit frequency and having two or more local oscillators operative to simultaneously generate local oscillator signals, at corresponding local oscillator frequencies, for simultaneously down-converting two or more corresponding received radio-frequency signals, the method comprising: identifying one or more self-interfering frequencies, based on the local oscillator frequencies and the transmit frequency; generating a baseband cancellation signal by weighting and frequency-shifting a baseband representation of the transmit signal, based on the identified self-interfering frequencies; and combining the baseband cancellation signal with a down-converted received signal, to obtain an interference-reduced baseband signal; wherein identifying the one or more self-interfering frequencies comprises: determining a set of spurious frequencies corresponding to nonlinear products of the local oscillator signals; comparing each of the spurious frequencies with the transmit frequency; and identifying as self-interfering frequencies those of the spurious frequencies that fall within a predetermined range of the transmit frequency.