Experimental Demonstration and Performance Enhancement of 5G NR Multiband Radio over Fiber System Using Optimized Digital Predistortion

This paper presents an experimental realization of multiband 5G new radio (NR) optical front haul (OFH) based over fiber (RoF) system using digital predistortion (DPD). A novel magnitude-selective affine (MSA) DPD method is proposed for the complexity reduction and performance enhancement RoF link followed by its comparison with canonical piece wise linearization (CPWL), decomposed vector rotation (DVR) generalized memory polynomial (GMP) methods. Similarly, a detailed study shown implementation proposal neural network (NN) MSA, CPWL, DVR GMP In testbed, NR standard at 20 GHz 50 MHz bandwidth flexible-waveform signal 3 used to cover enhanced mobile broad band small cells scenarios. dual drive Mach Zehnder Modulator having two distinct frequency signals modulates 1310 nm carrier distributed feedback laser 22 km single mode fiber. The results are presented in terms adjacent channel power ratio (ACPR), error magnitude (EVM), number estimated coefficients multiplications. aims identify those methods such as MSA good candidate deploy real time scenarios NN which have slightly better compared but has higher levels. Both, methods, meeting 3GPP Release 17 requirements.