Multiple-access discrete-address communication systems

A relatively new method for organizing and designing communications systems using MADA and its two variants, RADA (random-access discrete-address) and SOMADA (self-organizing multiple-access discrete-address), are described. In these systems, time and frequency are used in an organized manner. Representative designs, system implementation and selection, and reliability are examined. In general, narrow-band SOMADA is more efficient than conventional operation with respect to spectrum utilization; for larger systems, broadband RADA may be superior.