Multiple-access techniques for communication satellites: analog modulation, frequency-division multiplexing, and related signal processing methods [by] E. E. Reinhart.

by Edward E. Reinhart

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A tutorial, theoretical description of analog modulation methods, frequency-division multiplexing, and the signal processing techniques sometimes used with them in radio communication systems. Amplitude and angle modulation methods (AM DSB, SSB, PM, FM, SSBFM) are all treated as special cases of a carrier that has been modulated simultaneously in both amplitude and phase or frequency. General relations among RF bandwidth, power (peak and average), and the characteristics of the signal at the receiver output for given combinations of the basic techniques are tabulated for convenient comparison with each other and with the digital modulation techniques reported in RM-4997-NASA. Application of frequency-division multiplexing to each kind of analog modulation is analyzed, with emphasis on speech transmission. The reduction in RF power and/or bandwidth made possible in each case by application of preemphasis, companding, or TASI (time assignment speech interpolation) is shown, bringing new results together with material hitherto scattered in technical journals.

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