Digital Modulation Enhancement Study

Abstract

A new method of nonlinear modulation of analog information is described which gives a substantial improvement in performance over conventional modulation techniques, such as PCM. The modulation technique which the author has called Multistream Modulation (MSMO) provides the capability of designing modulation performance characteristics which can be tailored to specific needs. The theoretical concepts presented were verified by measurements made on a digital transceiver breadboard constructed during this program. The transceiver breadboard included both the MSM and PCM systems. This enables voice experiments to be conducted with the transceiver which provided instantaneous switching from PCM to MSM. The informal voice tests which were carried out showed that the predicted and measured threshold extension over PCM was also obtained with voice communication.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1973
Accession Number
AD0755939

Entities

People

  • Herbert Gish

Tags

DTIC Thesaurus Topics

  • Amplitude Modulation
  • Breadboard Models
  • Coding
  • Communication Channels
  • Communications Techniques
  • Converters
  • Decoding
  • Measurement
  • Models
  • Modulation
  • Modulators
  • Noise Generators
  • Pulse Amplitude
  • Signal Generators
  • Signal Processing
  • Waveform Generators
  • Waveforms

Fields of Study

  • Engineering

Readers

  • Electronics Engineering
  • Radio communications and signal processing.