Trellis Coded CPFSK

Abstract

Continuous Phase Frequency Shift Keying (CPFSK) is a potentially attractive modulation scheme with constant envelope and good spectral characteristics for energy constrained and band-limited satellite channels. This research deals with Orthogonal Frequency Shift Keying (FSK), Minimum Shift Keying (MSK) which is a special case of CPFSK, uncoded quaternary CPFSK and finally coded quaternary CPFSK. Orthogonal FSK is simulated by making the modulation index (h) equal to one, and all the other simulations are performed with h=1/2. A rate 1/2 convolutional encoder with constraint lengths (k), k=2, 3, and 4 are used in coded quaternary CPFSK simulations. Good coding gains are obtained with only a slight increase in receiver complexity. Soft decision with the Viterbi Algorithm was applied to all CPFSK and one MSK application. Hard decision was applied to Orthogonal FSK and another MSK application.

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Document Details

Document Type
Technical Report
Publication Date
Dec 10, 1992
Accession Number
ADA261788

Entities

People

  • Zafer Inceoglu

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Algorithms
  • Artificial Satellites
  • Coding
  • Communication Systems
  • Computer Programming
  • Computer Programs
  • Computers
  • Electrical Engineering
  • Engineering
  • Frequency
  • Frequency Shift
  • Modulation
  • Modulators
  • Schools
  • Shift Registers
  • Simulations
  • Symbols

Fields of Study

  • Engineering

Readers

  • Radio communications and signal processing.

Technology Areas

  • Space