The Communication and Signal Processing Group (CSP Group) at Imperial College London has a fascinating history rooted in the groundbreaking work of early 20th-century pioneers like Alan Blumlein (stereophonic sound), Dennis Gabor (holography, image processing), Alec Reeves (PCM), and Colin Cherry (human communication). The Group has made significant contributions to digital signal processing and communication technologies, impacting various fields such as radar, sonar, and modern mobile communications.
In 1951, the first Information Theory Symposium was co-chaired by Professors Cherry and Gabor. Held at the Imperial College building on Exhibition Road, now home to the Victoria and Albert Museum, this symposium attracted international participants like Claude Shannon and Leon Brillouin, who are now recognized as key figures in information theory and signal processing.
The CSP Group as we know it began to take shape in the late 1960s, driven by the shift to digital technology. Researchers like Colin Cherry, Dennis Gabor, and Bruce Sayers saw the need for more advanced digital techniques. In 1967, the first international gathering of experts in digital signal processing was organised by Bob Bogner and Tony Constantinides at Imperial College, focusing on digital filter design and applications in speech and image processing.
The Group's research continued to evolve, with collaborations between Bogner, Cherry, Gabor, and Constantinides leading to significant advancements in digital signal processing and communications. By 1970, the second international conference on Digital Signal Processing (DSP) was held, broadening its scope to include biological and medical applications. Professor Bruce Sayers led efforts in heart-rate modelling and algorithmic implementation, supported by a small team exploring the use of microprocessors.
During the mid-1970s, Bruce Sayers became Head of the Department of Electrical Engineering at Imperial College and appointed Tony Constantinides to expand the DSP work and applications. This led to the transformation of the Engineering in Medicine section into the Signal Processing and Applications Section. The Group secured extensive research funding from government defence related sources and UK industry partners like British Telecom, STC, Plessey, Marconi, Philips, and GEC, focusing on integrating digital technology with traditional analogue systems.
The late 1970s saw a period of adjustment following Professor Colin Cherry's retirement. The Group's research efforts primarily targeted defence areas (radar and sonar systems) and the telecommunications industry's shift to digital technology. This work significantly influenced both domains and led to collaborations with the USA's DARPA program under the Alvey Programme in 1982.
In the late 1980s, the CSP Group established the University Research and Defence Collaboration Centre (URDC Centre) with substantial triennial funding. The group also launched the MSc course in Communications and Signal Processing, the first of its kind at Imperial College and in the UK, serving as a model for similar courses worldwide.
In 1997, under Bob Spence as Head of Department, the Communication Section led by Laurie Turner merged with the Signal Processing and Applications Section led by Tony Constantinides, forming the current CSP Group first led by Tony Constantinides. The number of PhD students in the group increased significantly, with many graduates becoming leaders in modern digital communication technologies like 4G, 5G, 6G, and MIMO. The Group's scope continued to expand, covering areas such as communication networks, artistic output characterization, archaeological site modelling, financial signal processing and AI and machine learning.
In 2004, after 30 years of leadership, Professor Tony Constantinides retired, and Mr Mike Brookes, an expert in speech processing, became head for two years. He was succeeded by Professor Maria Petrou, an expert in image processing, who led the group for about four years. In 2009, Professor Kin Leung, an expert in communication and wireless networks, took over as head, followed by Professor Bruno Clerckx in 2024, an expert in wireless communication and signal processing.