Since its inception, the communications group at UCSD has been one of the largest and most visible communications groups in the world. The research interests of the faculty span a variety of topics, including adaptive signal processing, communications networks, data science, digital communications theory, electromagnetic wave propagation, error-correction coding, image and video compression, information theory, and stochastic processes, control, and optimization. Applications of the research include cognitive radio and networking, communication channels in feedback control systems, distributed storage, human networks of social contacts, magnetic and solid-state memories, wireless and mobile networks, sensor networks and internet of everything (IoE), and underwater acoustic channels.