An experimental modulation-demodulation scheme for high-speed data transmission

The primary motivation of the group in this experimental development was to find a suitably economic system in terms of reliability and equipment simplicity for transmitting binary data from point to point. To this end solutions, primarily with respect to private telephone lines were considered. At the heart of this problem is the right choice of modulation and demodulation schemes, so that before describing the system, one should survey the limitations of various approaches which were faced in the light of boundary conditions of the present telephone network.