THE ORTHOMATCH DATA TRANSMISSION SYSTEM
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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Orthomatch is a high-performance data transmission or telemetry system which uses envelope-orthogonal signals in the transmitter and matched- filter detectors in the receiver. Because of the parallel coding and optimum detection techniques of Orthomatch, its calculated performance equals or betters the calculated performance of other available teleme try systems. It is within 10.2 db of Shannons ideal system. A practical Orthomatch system, operating with 16 levels of amplitude resolution and a 40-kcps word rate 160-kcps bit rate, has been assembled in field-prototype form and tested with transmitter and receiver components at 2.22 Gcps. Signal-in-noise performance of this practical system was found to be within 1.5 db of calculated performance. High performance at low signal levels and other advantages of Orthomatch make it attractive for use at high data rates in space-to-ground or other transmission links where transmitter power is at a premium.