This book is a compilation of contributed research work from International Conference on Electronic Systems and Intelligent Computing (ESIC 2021) and covers the areas of electronics, communication, electrical and computing. This book is specifically targeted to the students, research scholars and academician from the background of electronics, communication, electrical and computer science. Advances in electronics, communication, electrical and computing cover the different approaches and techniques for specific applications using particle swarm optimization, Otsu’s function and harmony search optimization algorithm, DNA-NAND gate, triple gate SOI MOSFET, micro-Raman and FTIR analysis, high-k dielectric gate oxide, spectrum sensing in cognitive radio, microstrip antenna, GPR with conducting surfaces, energy-efficient packet routing, iBGP route reflectors, circularly polarized antenna, double fork-shaped patch radiator, implementation of Doppler radar at 24 GHz, iris image classification using SVM, digital image forgery detection, secure communication, spoken dialog system and DFT-DCT spreading strategies.