Time Domain Phase Noise Mitigation in OFDM Systems for Sub-THz Bands

The phase noise (PN) generated by the oscillators limits the link performance of radio frequency transmission systems. In OFDM, the PN induces intercarrier interference (ICI) which needs to be addressed to limit spectral efficiency penalty. In this work, we propose a new algorithm called time domain filter (TDF). It consists in mitigating the ICI by estimating and compensating the PN in the time domain (i.e. before the Fourier transform operation at the receiver). It takes advantage of the correlated nature of the PN. We perform comparison between the proposed algorithm and those presented in the literature. We show through numerical results that the proposed algorithm outperforms the phase noise tracking algorithms in the literature, assuming 5G New Radio numerologies and simple pilot pattern.