This book presents the proceedings of the 4th International Conference on Electronics and Signal Processing (ICESP 2023), which was held in Macau, China during January 13-15, 2023. The book consists of contributions from various authors from both academia and industry, focusing on a diverse aspect of signal processing and information communication systems. The published papers suggest cutting-edge solutions that contribute to the quest for the future applications and communicating systems. The book is a useful reference to research students, research fellows, and scientists and engineers in the corresponding fields.