Made a number of world-first contributions to Optical Wireless (OW) systems introducing a large number of new concepts that led to world record performance improvements and data rates that increased as a result from few Mbit/s to multi Gbit/s with full mobility. Previous indoor mobile optical wireless systems operated typically at 30 Mbit/s (Djahani and Kahn IEEE TCOM 2000) to 100 Mbit/s (Audeh Kahn IEEE TCOM 95 and Boucouvalas and Vitsas, IEE Optoelectronics 2003).