Accession Number:

ADA224911

Title:

Effect of Worst-Case Multiple Jammers on Coded FH/SSMA Systems

Descriptive Note:

Interim rept. Jan 1988-Jun 1989

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

Report Date:

1990-07-31

Pagination or Media Count:

41.0

Abstract:

This report characterizes and evaluates the effect of simultaneous multiple partial-band noise or tone jammers and other-user interference on a single communication link employing frequency-hopped spread-spectrum FHSS signaling, M-ary frequency-shift-keying FSK modulation with noncoherent demodulation, and Reed-Solomon coding. For the symbol error probability of these systems, we derive exact expressions in the absence of multiple-access MA interference and tight upper bounds in the presence of other-user interference. Although our analytical methods are valid for any number of multiple jammers, we restrict our numerical study to the cases of two and three partial-band noise and tone jammers. For fixed values of the spectral densities of noise jammers, or the energies per symbol of tone jammers, we evaluate the worst-case fraction of the band that each jammer should use in order to maximize the error probability of the FHSS or FHSSMA system. For the range of the signal-to-jammer power ratios examined, multiple noise or tone jammers appear to have no advantage over a single noise or tone jammer of equivalent spectral density or energy per symbol but achieve approximately the same worst-case performance by jamming smaller fractions of the band. Keywords Jamming, Antijamming, Frequency hopping, Frequency shift keying, Spread spectrum, Multiuser interference, Multiple access, Error correction codes.

Subject Categories:

  • Countermeasures
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE