Generation of OFDM Waveform with 4.8 GHz Bandwidth Passing Through Terahertz and Millimeter-Wave Bands in Beyond 5G System

The “virtualized terminal” system which uses an OFDM waveform spanning 4.8 GHz bandwidth passing through terahertz and millimeter-wave bands has been studied towards the Beyond 5G. This paper studied the effect of the “2-stage nonlinearity” caused by two amplifiers at both of those bands. This study also evaluated two baseband circuits for the OFDM signal generation: one that generates a 4.8 GHz OFDM signal in a single batch, and another one that divides the 4.8 GHz into 400 MHz sub-bands and generates OFDM signal for each sub-band. The results of the evaluation that assumed the phase noise, fading, and 2-stage nonlinearity showed there was little degradation by the 2-stage nonlinearity or sub-band division.