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Optimum Subcarrier Deviation for PCM/FM+FM/FM Systems using IRIG Constant Bandwidth Channels

International Telemetering Conference Proceedings / October 25-28, 1993 / Riviera Hotel and Convention Center, Las Vegas, Nevada / A typical PCM/FM system is designed for a peak to peak carrier deviation of 0.7
times the bit rate of the PCM data. This value of PCM data deviation has been shown
to be optimum for both PCM/FM [1] and PCM/FM+FM/FM [2] systems. However,
the optimum deviation of the carrier by the FM subcarrier for a PCM/FM+FM/FM
system is dependent upon the specific subcarrier type and required subcarrier signal to
noise ratio at the receiver output.
This paper introduces a simple method to calculate the optimum deviation of the
carrier by FM subcarriers for a PCM/FM+FM/FM system. The method developed is
used to calculate the optimum value of subcarrier deviation for two sample
PCM/FM+FM/FM systems when IRIG constant bandwidth channels are used as FM
subcarriers. The calculated optimum values of FM subcarrier deviation of the carrier,
subcarrier mod index, are utilized in a companion paper to study the performance of
PCM/FM+FM/FM systems [3].
The work presented herein can be extended to calculate the optimum deviation of the
carrier by FM subcarriers for any PCM/FM+FM/FM system.

Identiferoai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/608851
Date10 1900
CreatorsOsborne, William P., Whiteman, Donald E.
ContributorsNew Mexico State University
PublisherInternational Foundation for Telemetering
Source SetsUniversity of Arizona
Languageen_US
Detected LanguageEnglish
Typetext, Proceedings
RightsCopyright © International Foundation for Telemetering
Relationhttp://www.telemetry.org/

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