Nonlinear Digital Self-Interference Cancellation for Full Duplex Systems in Frequency Agility Mode

This paper proposes a novel nonlinear digital self-interference cancellation (DSIC) technique for the full duplex systems operating in the frequency agility mode, which would be a potential candidate for anti-jamming communications with full duplex configuration. Unlike the conventional real-time estimation methods, the self-interference channel coefficients of the whole working band are generated directly from an offline-calculated polynomial fitting model when the working frequency varies. Thus, the proposed method could significantly reduce the online computational complexity as well as maintain a comparable performance in comparison with the conventional methods. The experimental measurements were carried out and the results demonstrate that over 51 dB digital-interference-cancellation-ratio (DICR) could be achieved with much lower online computational complexity.

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