Evaluation of transmission efficiency according to Hartley's expression of information content

The author defines the efficiency of a transmission system as the ratio of the max. rate at which information can actually be transmitted to the max. rate at which it could be transmitted over an ideal system using the same bandwidth and s./n. ratio in the propagation medium. The amount of information is evaluated using the Hartley law extended to take account of s./n. ratio. The efficiencies of the better known pulse transmission systems are evaluated and compared.