Data Transmission by Frequency-Division Multiplexing Using the Discrete Fourier Transform

The Fourier transform data communication system is a realization of frequency-division multiplexing (FDM) in which discrete Fourier transforms are computed as part of the modulation and demodulation processes. In addition to eliminating the bunks of subcarrier oscillators and coherent demodulators u...

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Bibliographic Details
Published inIEEE transactions on communication technology Vol. 19; no. 5; pp. 628 - 634
Main Authors Weinstein, S., Ebert, P.
Format Journal Article
LanguageEnglish
Published 01.10.1971
Subjects
Bandwidth
Communications technology
Data communication
Demodulation
Discrete Fourier transforms
Fast Fourier transforms
Fourier transforms
Frequency division multiplexing
Military computing
Oscillators
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Summary:The Fourier transform data communication system is a realization of frequency-division multiplexing (FDM) in which discrete Fourier transforms are computed as part of the modulation and demodulation processes. In addition to eliminating the bunks of subcarrier oscillators and coherent demodulators usually required in FDM systems, a completely digital implementation can be built around a special-purpose computer performing the fast Fourier transform. In this paper, the system is described and the effects of linear channel distortion are investigated. Signal design criteria and equalization algorithms are derived and explained. A differential phase modulation scheme is presented that obviates any equalization.
ISSN:0018-9332
2162-2175
DOI:10.1109/TCOM.1971.1090705