Coherent FDM/FM Telephone Communication

This paper analyzes telephone communication as applied to a satellite repeater system. Particular emphasis is placed on a method of coherent reception which is important to our emerging communication satellite systems. This reception technique is not new to the field of space communications and telemetry; however, it is new to the field of common carrier telephony. As a consequence, for the class of signals utilized in common carrier telephony, an attempt is made to place on a quantitative footing the design of FDM/FM satellite communication systems. The interrelation among such quantities as sensitivity, bandwidth occupancy, and channel quality is presented for a simply realized second-order receiving system. In addition, the maximum sensitivity achievable with the optimum receiving system is shown. It is anticipated that these two situations will bound the performance of the majority of systems.