PERFORMANCE ANALYSIS OF RF SYSTEM IMPERFECTIONS IN 6G RADIO COMMUNICATION AT SUB-THz BANDS

6G is the next generation of mobile radio communication systems. It aims to have more sustainable and inclusive ubiquitous radio connectivity at lower latencies, faster rates, and a higher bandwidth than 5G radio systems. Usage of sub-THz bands (> 100 GHz) in 6G systems enables performance gains in terms of latency, data rates, transmission bandwidth, signal interference, and network capacity. The main challenges at such higher frequency bands are to have resilient waveforms and capability in handling hardware limitations such as phase noise. Therefore, it is high time to explore the possibilities of design, optimize, and test the signal generation, digital, and radio frequency (RF) hardware. This work is mainly aimed at the imperfections of hardware in handling the candidate 6G orthogonal frequency division modulation (OFDM) signals. The imperfections include non-linearities of the power amplifier, phase noise, and filter characteristics that spread the signal spectrum beyond the channel bandwidth. The system parameters are designed and configured according to ITU-R radio models while quantifying the impairments. The hardware imperfections are demonstrated using adjacent channel power radio (ACPR) and error vector magnitude (EVM) as metrics. ACPR measurements help to study spectral regrowth due to the nonlinearity of power amplifiers.