Coded Orthogonal Signaling

Abstract

In this thesis, a new scheme of encoding orthogonal MFSK signals with convolutional codes is proposed. Instead of separating the code and the signals as is done conventionally, here the m outputs of the convolutional encoder of rate k/m are used to select the M = 2m orthogonal FSK signals. This combined coded system is called trellis-coded modulation MFSK (TCM/MFSK). The free distance of TCM/MFSK codes is found computationally. Asymptotic coding gains (ACG) of several TCM/MFSK systems relative to uncoded MFSK systems having the same bandwidth efficiency (bits/s/Hz) are calculated. Both analytic descriptions and natural mapping implementations of TCM/4-FSK with rate 1/2 and TCM/8-FSK with rate 2/3 for several constraint lengths of the convolutional codes are given. The analytic description of TCM/MFSK is also obtained computationally. Coding, TCM, MFSK.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1992
Accession Number
ADA257635

Entities

People

  • Salih Semerciler

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Classification
  • Coding
  • Coefficients
  • Communication Systems
  • Computer Programs
  • Computers
  • Decoders
  • Decoding
  • Demodulation
  • Digital Communications
  • Electrical Engineering
  • Engineering
  • Frequency
  • Frequency Synthesizers
  • Modulation
  • Real Numbers
  • Waveforms

Readers

  • Computer Programming and Software Development.
  • Radio communications and signal processing.