Digital predistortion of hardware impairments for full-duplex transceivers

Digital predistortion is applied to account for all significant hardware impairments in a regeneration architecture full-duplex transceiver. Compared to a conventional regeneration architecture, where non-linearities are simply reconstructed for cancellation, by predistorting we avoid these components to achieve an improvement in both self-interference suppression and signal quality. A new set of predistortion basis functions is proposed for the cascade of baseband non-linearities, mixer IQ imbalance, and power amplifier non-linear memory effects. Experimental results on a hardware testbed operating in the 2.4 GHz ISM band show that an additional 14 dB analog suppression can be achieved using the proposed pre-distortion basis over a 20 MHz bandwidth (compared to the case without predistortion), leading to a total self-interference suppression of 71.5 dB.