Baseband Phase Noise Modeling and Analysis for 140GHz THz DFT-s-OFDM System

Abstract

In this paper, the performance of the DFT-s-OFDM system is studied in the presence of phase noise for the THz wireless communications. We are conducting the studies to evaluate the phase noise effect in the THz system and to help it be used in system design, and this paper deals with baseband modeling procedures of the phase noise characteristics in the 140GHz frequency band. Firstly, we consider the phase noise effect of the DFT-s-OFDM system as a matrix form. Secondly, we elaborate the procedure for modeling phase noise by converting the analog phase noise model to its baseband equivalent digital model. For the accuracy of the phase noise model, we also consider the measured results from the data-sheet of the real oscillators. Finally, using the derived phase noise model, we perform link-level simulation on a 140GHz DFT-s-OFDM system extended from the specification of 5G NR, and evaluate its performance in presence of phase noise. We believe that our phase noise modeling procedure can offer a useful benchmark for optimal transmitter and receiver designs in DFT-s-OFDM systems with phase noise in THz frequency band.