DocumentCode :
1227446
Title :
A Derivation of the Spectra of N-Ary Orthogonal Comtinuous-Phase FSK Waveforms for ELF/VLF Communications
Author :
White, Brian E.
Author_Institution :
Univ. of Wisconsin, Madison, Wis., USA
Volume :
19
Issue :
4
fYear :
1971
fDate :
8/1/1971 12:00:00 AM
Firstpage :
536
Lastpage :
539
Abstract :
The power spectral density of continuous-phase minimum-bandwidth waveforms composed from a set of N mutuallyorthogonal chips (pulsed sinusoids of equal amplitude and duration and constant frequency) is derived. The spectrum and its derivation for this class of signals are of particular interest in highpower extremely low frequency/very low frequency (ELF/VLF) communications where noise immunity is a prime consideration, but the signal bandwidth and transients at the transmitting antenna must be minimized. Exact formulas are also given without derivation for wider bandwidth signals in the same class but of less practical importance. Although the power spectra of more general binary signals are already known, the special case presented here permits a much simpler derivation than that given in an earlier paper [1]. In the N -ary case a previously derived formula for the spectra of continuous-phase multilevel FM signals [2] is augmented and evaluated to explicitly yield new spectral formulas useful in describing the frequency-hopping mode.
Keywords :
Bandwidth; Communications technology; Context; Frequency shift keying; Geophysical measurement techniques; Ground penetrating radar; Low-frequency noise; Noise level; Signal processing; Transmitting antennas;
fLanguage :
English
Journal_Title :
Communication Technology, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9332
Type :
jour
DOI :
10.1109/TCOM.1971.1090685
Filename :
1090685
Link To Document :
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