Self-interference cancellation using time-domain phase noise estimation in OFDM full-duplex systems

Abstract

In full-duplex systems, the local oscillator phase noise (PN) problem is one of the bottleneck challenges that may face the self-interference cancellation (SIC) stage especially when orthogonal frequency division multiplexing (OFDM) transmission scheme is deployed. Phase noise degrades the used SIC technique performance significantly, if not mitigated before or during the SIC stage. PN can be estimated and mitigated digitally in either time or frequency domain. Through this work, we propose a novel time-domain self-interference phase noise estimation and mitigation algorithm that is based on Wiener filter and enhances the performance of the SIC stage in full-duplex communication systems. Simulation results show that the proposed algorithm has a better performance than some current time-domain or frequency-domain PN mitigation solutions with a noticeable reduction in the computational complexity.