An optimum multiplexing system for space communications

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1967

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Abstract

A study of the projected state of the art at the earliest possible time for a preliminary Manned Mars Landing Mission, 1973, was conducted to determine equipment constraints. Mission profiles were studied to determine operational requirements. An optimum design employing conventional modulation and multiplexing techniques, phase modulation and frequency division multiplexing was analyzed, subject to the equipment constraints and operational requirements. A computer program was then developed to optimize the parameters as bit rate, subcarrier frequency and modulation index for such a design. A coherent PSK system, whose implementation is also discussed, was shown to have a considerable theoretical improvement in information rate over a conventional system.

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