Driven by the need of more available frequency bands, an increasing attention has been paid to the use of sub-THz bands. In such high frequency bands, the signal is expected to be impaired by phase noise, I/Q mismatch, power amplifier non linearities, etc. It has been shown that at such frequencies, with possibly large bandwidth (∼ 50 GHz), Gaussian phase noise models accurately the phase noise. This paper studies the effect of Gaussian phase noise on several waveforms. Here, five performance metrics are used to compare them: Bit Error Rate (BER), Peak-to-Average Power Ratio (PAPR), Adjacent Channel Power Ratio (ACPR), spectral efficiency (SE) and Error Vector Magnitude (EVM). The aim of this comparison is to give recommandations on which waveform to use in this context, depending on the impact of the phase noise on the performance of such transmissions.
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