Full-Duplex Radio Self-Interference Cancellation via CPNR

The patent extracts and separately processes the cyclic prefix portion from the received signal. By identifying and isolating the cyclic prefix region, the system can apply specialized processing to remove or mitigate the noise introduced by DSIC in this specific region, without affecting the overall cancellation performance on the useful signal portions.

The patent segments the received signal processing into distinct regions: cyclic prefix portions and useful signal portions. Different processing strategies are applied to each segment - with the cyclic prefix being handled separately to remove DSIC-induced noise, while the useful signal portions maintain standard DSIC processing. This segmentation allows optimized handling of each region's specific characteristics.

The patent applies preliminary anti-action by estimating the self-interference signal channel before receiving the desired signal, then using this estimation to reconstruct and subtract the self-interference component from the received signal. This proactive cancellation approach prevents the high-power self-interference from overwhelming the receiver, enabling simultaneous transmission and reception at the same frequency.

The patent converts the harmful self-interference signal into a beneficial cancellation reference. By using the known transmitted signal and estimated channel response, the system reconstructs the self-interference component and subtracts it from the received signal, effectively transforming the harmful interference into a useful tool for improving reception quality and enabling full-duplex operation.