Coding for Navy UHF Satellite Communications CODEC EValuation Study.

Abstract

The NAVELEX breadboard codec performance has been verified in the uncoded and coded modes at all code rates. The operation of the data interleaver/deinterleaver and differential encoder/decoder has also been substantiated in the performance tests. Both the 1-bit hard decision and the 3-bit soft decision decoder modes are operational. Initial difficulties in the checkout phase were determined to originate in a defective -5 volt power supply module, which is being replaced. It was also necessary to perform some minor adjustments to the AGC gain block D.C. bias control (R8). Through careful adjustment of this bias control, an acceptable signal output to the quantizer-bit synchronizer was obtained. This nulling adjustment allows for optimum coder-decoder performance in the presence of zero-mean noise, by eliminating the D.C. offset present at the quantizer input.

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Document Details

Document Type
Technical Report
Publication Date
May 14, 1981
Accession Number
ADA101664

Entities

Organizations

  • Harris Corporation

Tags

Communities of Interest

  • Energy and Power Technologies
  • Human Systems
  • Space

DTIC Thesaurus Topics

  • Accumulators
  • Analyzers
  • Artificial Satellites
  • Bandwidth
  • Coders
  • Coding
  • Comparators
  • Decoders
  • Decoding
  • Demodulators
  • Detectors
  • Generators
  • Measurement
  • Modulators
  • Performance Tests
  • Power Supplies
  • Shift Registers

Readers

  • Aerospace Test and Evaluation
  • Computer Programming and Software Development.
  • Radio communications and signal processing.

Technology Areas

  • Space