Nonlinear Distortion Analysis in Wireless Cellular 5G IoT Systems

The performance analysis of the post-OFDM waveforms such as FBMC and UFMC as a potential 5G Redcap IoT modulation waveforms at n78 (3.3–3.8 GHz) 5G below 6 GHz frequency band and 64QAM, FBMC and UFMC waveforms at n258 (24.5 -27.5 GHz) is presented. The power spectral density and linearity improvement of FBMC which has the lowest OOB (out-of-band) emission over UFMC is about 8 dB and 5 dB for channel bandwidths of 3 MHz and 10 MHz respectively. Both 5G IoT FR 1 modulated waveforms are evaluated by simulation at saturation power levels for nonlinear distortions of the power amplifier (Mini-Circuits ZHL 4240W) using Matlab and Keysight’s ADS software tools. The nonlinear distortion of the power amplifier (Analog Devices HMC930A) using the 5G IoT FR 2 64QAM, FBMC and UFMC waveforms for channel bandwidth of 100 MHz are evaluated using Keysight’s System Vue. Power spectral density and linearity for 100 MHz FBMC waveform over UFMC waveform is about 20 dB achieved.