On the Close Packing of Unsynchronized FDM Waveforms

Abstract

The effects of crosstalk on unsynchronized FDM communication links operating in the presence of additive white Gaussian noise are considered for several modulation schemes. Continuous-phase frequency shift keying is found to be far superior to various forms of phase shift keying in the sense that many more uncoordinated frequency division multiplexed waveforms can be packed into a given bandwidth for a certain imbalance in transmitter powers. This result can be applied to the uplinks and/or downlinks of a demodulating communications satellite serving a multitude of mobile terminals.

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Document Details

Document Type
Technical Report
Publication Date
Oct 14, 1975
Accession Number
ADA021412

Entities

People

  • Brian E. White

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Additives (Chemicals)
  • Air Force
  • Amplitude
  • Communication Systems
  • Detection
  • Electrical Engineering
  • Frequency Shift
  • Gaussian Noise
  • Line Of Sight
  • Modulation
  • Multiple Access
  • Notation
  • Phase Shift
  • Spectra
  • Tactical Communications
  • Time Division Multiple Access
  • Waveforms

Readers

  • Image Processing and Computer Vision.
  • Materials Science.
  • Tactical Satellite Communications Systems Engineering.

Technology Areas

  • Space