Spread Spectrum Modulation by Means of Time-Varying Linear Filtering.

Abstract

Time-varying linear filtering can be used to generate a broad class of spread spectrum signals which includes Direct Sequence spread spectrum as a special case. The technique is based on a fflter of arbitrary length whose impulse response changes rapidly It can spread the data signal in time as well as in frequency, thereby introducing a form of protection from errors similar to error-correcting coding and interleaving. Time-varying filter (TVF) systems can produce a broad range of noise-like waveforms and can be designed to minimize spillover into adjacent frequency regions. These properties should provide benefits in defense as well as in civilian radio communication systems.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1995
Accession Number
ADA300627

Entities

People

  • Howard L. Dyckman

Organizations

  • Naval Command, Control and Ocean Surveillance Center

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Amplitude Modulation
  • Code Division Multiple Access
  • Communication Systems
  • Filters
  • Filtration
  • Frequency
  • Frequency Domain
  • Frequency Shift
  • Gaussian Noise
  • Information Theory
  • Modulation
  • Modulators
  • Ocean Surveillance
  • Signal Processing
  • Spread Spectrum
  • Time Domain
  • Waveforms

Fields of Study

  • Engineering

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Economics
  • Radio communications and signal processing.