Noise Suppressing Cascaded IIR Elliptic Filter Design for ECG Signals -- Performance Analysis of Barlekamp-Massey based KES block for 3-Byte RS Decoder -- Compact Broadband Antenna using Modified Ground Plane -- A Highly Sensitive and Ultra-Low Loss Photonic Crystal Fiber Based Gas and Chemical Sensor -- Raspberry Pi Controlled Home Security and Defense Robot with Visual and Audio Recognition with Android Application Control -- COVID-19 Data Forecasting using Soft Computing Technique -- Generalized Multi-Server platform based Remote User Authentication -- Design of an energy efficient probabilistic algorithm for a hybrid healthcare network -- Investigating the Behavioral and Physiological Analysis of Learners while Interacting in Online Educational Platforms.

This book provides insights into the 3rd International Conference on Communication, Devices and Computing (ICCDC 2021), which was held in Haldia, India, on August 16-18, 2021. It covers new ideas, applications, and the experiences of research engineers, scientists, industrialists, scholars, and students from around the globe. The proceedings highlight cutting-edge research on communication, electronic devices, and computing and address diverse areas such as 5G communication, spread spectrum systems, wireless sensor networks, and signal processing for secure communication, error control coding, printed antennas, analysis of wireless networks, antenna array systems, analog and digital signal processing for communication systems, frequency selective surfaces, radar communication, and substrate integrated waveguide and microwave passive components, which are key to state-of-the-art innovations in communication technologies. .