Simple Asynchronous Multiplex System for Unidirectional Low-Data-Rate Transmission

The communication system considered is characterized by a large number of stations transmitting messages through a simple binary channel to a single central receiver in an unsynchronized and unorganized fashion. Individual messages are repeated according to statistical criteria. The form of coding selected permits detection but not separation of coinciding or overlapping messages. Hardware requirements are discussed, and a model system, whose behavior is in agreement with theoretical results, is described. A conclusion is that the proposed system is well suited to simple alarm and telemetry applications.