Spectral Energy Distribution of Radio Link FM

The series expansion for the energy distribution of quasi-niose-modulated and arbitrarily preemphasized FM signals is being derived. Computer evaluations for the CCIR multichannel preemphasis in the range applicable to systems between 12- and 1800-channel loading show that not the total phase deviat...

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Bibliographic Details
Published inIEEE transactions on communications Vol. 20; no. 2; pp. 165 - 173
Main Authors Mueller, M., Gentry, T.
Format Journal Article
LanguageEnglish
Published IEEE 01.04.1972
Subjects
Baseband
Communication systems
Demodulation
DH-HEMTs
Frequency modulation
Interference
Laboratories
Negative feedback
Radio frequency
Radio link
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Summary:The series expansion for the energy distribution of quasi-niose-modulated and arbitrarily preemphasized FM signals is being derived. Computer evaluations for the CCIR multichannel preemphasis in the range applicable to systems between 12- and 1800-channel loading show that not the total phase deviation but the deviation η top of the upper baseband portion is the quantity governing the energy density beyond 1.5 times base bandwidth off the carrier frequency. The interference into the adjacent channel is computed and a channel spacing formula is deducted based on an interference level equivalent to 3 pW. The formula is B_{n} = 3M + 1KD , where M is the highest baseband frequency, K a factor between 0 and 1, and D the peak frequency deviation obtained with peak factor of 9 dB.
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOM.1972.1091132