Robust Frequency-Hopping System for Channels with Interference and Frequency-Selective Fading

Abstract

A robust frequency-hopping system with noncoherent detection, iterative turbo decoding and demodulation, and channel estimation is presented. The data modulation is the spectrally compact nonorthogonal continuous-phase frequency-shift keying, which strengthens the frequency-hopping system against multiple-access interference and multitone jamming. An analysis based on information theory provides the optimal values of the modulation index when there is a bandwidth constraint. The channel estimator, which is derived by applying the expectation-maximization algorithm, accommodates both frequency-selective fading and interference. Simulation experiments demonstrate the excellent system performance against partial-band interference.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2007
Accession Number
ADA492610

Entities

People

  • Don Torrieri
  • Matthew C. Valenti
  • Shi Cheng

Organizations

  • United States Army Research Laboratory

Tags

DTIC Thesaurus Topics

  • Algorithms
  • Carrier Frequencies
  • Channel Estimation
  • Decoding
  • Demodulation
  • Demodulators
  • Doppler Effect
  • Estimators
  • Frequency
  • Frequency Agility
  • Frequency Shift
  • Matched Filters
  • Modulation
  • Multiple Access
  • Probability
  • Random Variables
  • Simulations

Fields of Study

  • Engineering

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Radio communications and signal processing.