Error protection via time diversity

The advent of transistorized circuit elements and digital techniques has made it possible to develop a dormant method for the improvement of record data communications which is far more effective and economical than alternate proposals in the last decade. PEP should go a long way in satisfying the requirements for accurate transmission of press broadcasts, shore-to-ship transmissions and ground-to-air transmission where other means such as ARQ are hardly applicable since a poor or no return circuit is available during the required transmission time. The logic of the PEP system cannot be contradicted since it fits the means for correction of the time variant character of most disturbances and the criterion for operation is based on the direct measlwement of distortion. This is a radical departure in diversity receiving techniques but more direct and conclusive in its action. As an error protection system, the dependence solely upon bit distortion assessment enables the transmission of any unprocessed data serial bit stream. Thus crypto, 5, 7, 8, 10 unit character coding or digital voice and facsimile can all be handled with equal facility without coding for error correction.