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Self-interference cancellation plays a crucial role in achieving reliablefull-duplex communications. In general, it is essential to cancel theself-interference signal below the thermal noise level, which necessitatesaccurate reconstruction of the self-interference signal. In this paper, wepropose a high-precision channel estimation method specifically designed forsub-noise self-interference cancellation. Exploiting the fact that alltransmitted symbols are known to their respective receivers, our methodutilizes all transmitted symbols for self-interference channel estimation.Through analytical derivations and numerical simulations, we validate theeffectiveness of the proposed method. The results demonstrate the superiorperformance of our approach in achieving sub-noise self-interferencecancellation.

High-Precision Channel Estimation for Sub-Noise Self-Interference Cancellation