ROBERT F. H. FISCHER received his PhD in electrical engineering from the University of Erlangen-Nürnberg, where he is now a member of the Telecommunications Institute, teaching graduate courses in digital communications and supervising various research projects. Previously he held a postdoctoral position at the IBM Research Laboratory in Zurich, where he worked on algorithms and the implementation of PCM voice-band modems. His current work concentrates on fast digital transmission, including single- and multicarrier modulation techniques. Dr. Fischer is the recipient of several awards and holds more than ten international patents in the field of digital communications.