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Analysis of DAC Impact on Digital-controlled Self-interference Cancellation

Adaptive interference cancellation is an effective approach to enable full-duplex wireless communication in the multi-antenna co-site shipboard environments. Regarding the new digital-controlled cancellation implementation, the paper presents the system model, deduces the quantitative analytical expressions of interference suppression with and without DAC quantization noise, and conducts the waveform simulation verification. Analysis and simulation results show that the DAC quantization noise does not affect the system stability and convergence process, but do affect significantly the interference suppression performance if not designed appropriately. It is also shown that with appropriate parameter optimization, the DAC quantization noise would not be the limiting factor of system performance.