A New Multiplex Technique for Communication Systems

A new technique for multiplex communication is described, in which orthogonal pulse waveforms are transmitted as simultaneous subcarriers. Information signals are carried in the form of independent amplitude modulations of each subcarrier, and are extracted by means of waveform correlation. Known as ORTHOMUX (orthogonal multiplexing), the new technique offers the advantages of: 1) high spectrum efficiency, 2) maximum rejection of crosstalk and noise, 3) information response down to zero frequency, 4) mixed information rates, 5) simple, compact equipment, and 6) modular flexibility.