Vector Space Approach to Narrowband Interference Excision

Abstract

To realize the full performance advantage of a pseudonoise spread- spectrum communication system, a receiver must suppress strong narrowband interferers. Conventional frequency-domain excision techniques are complicated by spreading effects due to the sidelobes of the sin(x)/x function. This paper shows that such problems can be avoided by regarding the N samples of a band- limited times series and its finite Fourier transform as a vector in an N- dimensional space. Narrowband interference can be suppressed by projecting the data vector onto the subspace orthogonal to the one that best fits the interference. The theory developed here includes a least squares criterion for finding this subspace.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1988
Accession Number
ADA199703

Entities

People

  • Ralph F. Guertin

Organizations

  • MITRE Corporation

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Bandwidth
  • Communication Systems
  • Eigenvalues
  • Eigenvectors
  • Excision
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Narrowband
  • Sidelobes
  • Signal Detection
  • Signal Processing
  • Spectra
  • Spread Spectrum
  • Time Domain
  • Vector Spaces

Fields of Study

  • Engineering

Readers

  • Computational Modeling and Simulation
  • Graph Algorithms and Convex Optimization.
  • Radio communications and signal processing.

Technology Areas

  • Space