Adaptive Data Transmission Study.

Abstract

*DATA TRANSMISSION SYSTEMS, INTERSYMBOL INTERFERENCE, VITERBI DECODING, SIGNAL PROCESSING, *TROPOSPHERIC SCATTER COMMUNICATION, MAXIMUM LIKELIHOOD ESTIMATIONA study was completed of feasible techniques for transmission of up to 13 megabits/second over a tropospheric-scatter channel. The techniques identified for this study were frequency-division-multiplex/frequency modulation, parallel processing of subchannel data, transmitter time-gating, receiver time-gating, coding techniques, maximum likelihood detection including the Viterbi algorithm, and adaptive equalization. The investigation considered a realistic channel model and terminal equipment constraints in a determination of technique performance, adaptability to a changing multipath channel, and implementability. A practical realization of a feedback equalizer was found to have superior performance relative to all other practical receivers considered. Moreover, the equalizer performance was within 1 dB of a bound for an ideal maximum likelihood decoder. (Modified author abstract)

Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1973
Accession Number
AD0768999

Entities

People

  • Peter Monsen
  • Steven H. Richman

Tags

DTIC Thesaurus Topics

  • Channel Models
  • Coding
  • Data Transmission
  • Data Transmission Systems
  • Decoding
  • Frequency
  • Frequency Modulation
  • Intersymbol Interference
  • Message Processing
  • Modulation
  • Multipath Channels
  • Parallel Computing
  • Parallel Processing
  • Processing Equipment
  • Signal Processing
  • Tropospheric Scatter Communications

Fields of Study

  • Engineering

Readers

  • Radio communications and signal processing.
  • Systems Analysis and Design