Hybrid SI cancellation for single‐antenna full‐duplex radios.

A hybrid self‐interference (SI) cancellation scheme, composed of a two‐tap analogue canceller and a digital multi‐path SI canceller, is proposed for single‐antenna full‐duplex radios. The analogue canceller mitigates the two strongest components of the SI to prevent saturating the receiver. The digital canceller deploys an auxiliary receiver chain to capture the RF‐transmitted signal to mitigate the residual multi‐path SI signal. As the proposed scheme uses the RF‐transmitted signal as reference, the transceiver impairments such as power amplifier non‐linearities and phase noise are suppressed along with the SI. Experiments have validated the effectiveness of the proposed scheme on a 20 MHz long‐term evolution signal of +20 dBm power. [ABSTRACT FROM AUTHOR]