This brief presents a new approach to cancelling self-interference in full-duplex radios. By augmenting minimal-complexity analog cancellation hardware using a radio frequency vector multiplier with the flexibility and effectiveness of a digital baseband rational function finite impulse response (FIR) filter, the proposed approach enables excellent cancellation performance over a wide modulation bandwidth. This algorithm is devised by exploiting a simplified baseband equivalent behavioral model of the front-end of the full-duplex radio. This allows the parameters of the rational function FIR filter to be identified linearly using the least-squares estimation. The hardware proof-of-concept prototype, built using off-the-shelf components, demonstrated minimum self-interference cancellations of 50 and 40 dB for digitally modulated test signals with modulation bandwidths of 20 and 40–120 MHz, respectively.

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analog cancellation hardware baseband equivalent behavioral model modulation bandwidths algorithm hardware proofofconcept prototype radio frequency vector multiplier digitally modulated test signals approach leastsquares offtheshelf components minimum selfinterference cancellations digital baseband rational function finite impulse response fir filter the frontend of the fullduplex radio cancelling selfinterference in fullduplex radios

Jingjing Xia,Brynn King, Slim Boumaiza,.Digitally Assisted RF-Analog Self Interference Cancellation for Wideband Full-Duplex Radios. 65 (3),336-340.

Jingjing Xia,Brynn King, Slim Boumaiza,"Digitally Assisted RF-Analog Self Interference Cancellation for Wideband Full-Duplex Radios" 65

Jingjing Xia,Brynn King, Slim Boumaiza,"Digitally Assisted RF-Analog Self Interference Cancellation for Wideband Full-Duplex Radios"