Phase Distortion Study (Phase B)

Abstract

This is the Final Report of a 6 month study of duobinary digital data transmission over the DSCS. Analysis and computer simulations were developed for evaluating the degradation for duobinary SQPSK in the FDMA and TDMA modes, with emphasis on maximizing the bandwidth utilization capability of duobinary signalling. In a linear channel, single-access duobinary achieves rates of 3 bps/Hz, decreasing to 2.5 bps/Hz with a saturating transmitter and satellite. For duobinary FDMA, rates to 2.67 bps/Hz are possible in a nonsaturating channel with rates to 2.2 bps/Hz in a saturating channel. Error correction coding of duobinary is not recommended. Duobinary modem considerations and implementations are discussed in depth. The modem should incorporate phase distortionless maximally-flat filters, a sampling detector, 4-bit quantizer, the Viterbi algorithm, modified sync and phase tracking loops, and (preferably) an adaptive equalizer. While a new modem design is recommended, modification of the Harris MD-1002 modem for duobinary SQPSK operation is possible, and the required changes are specified in detail. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 30, 1977
Accession Number
ADA063779

Entities

People

  • C. L. May
  • C. R. Cahn

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Coding
  • Communication Channels
  • Communication Systems
  • Computer Programming
  • Computer Programs
  • Computers
  • Control Systems
  • Data Transmission
  • Decoding
  • Demodulation
  • Digital Communications
  • Digital Data
  • Intersymbol Interference
  • Modulation
  • Plastic Explosives
  • Repetition Rate
  • Satellite Communications

Readers

  • Data Mining and Knowledge Discovery.
  • Systems Analysis and Design
  • Tactical Satellite Communications Systems Engineering.

Technology Areas

  • Space