Accession Number : ADA183068

Title :   Coded FH/SS (Frequency-Hopped Spread-Spectrum) Communications in the Presenceof Combined Partial-Band Noise Jamming, Rician Nonselective Fading, and Multiuser Interference.

Descriptive Note : Interim rept. May 85-Aug 86,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s) : Geraniotis,Evaggelos ; Gluck,Jeffrey W

PDF Url : ADA183068

Report Date : 30 Jun 1987

Pagination or Media Count : 34

Abstract : In this report, we address the problem of combatting combined interference in spread-spectrum communication links. We consider frequency-hopped spread-spectrum systems with M-ary FSK modulation and noncoherent demodulation that use forward-error control coding. The interference consists of partial-band noise jamming, nonselective Rician fading, other-user interference, and thermal noise. The coding schemes that we analyze include: Reed-Solomon codes (with or without diversity and error/only), erasure-error or parallel erasure/error decoding); binary, nonbinary, and dual-k convolutional codes with or without side information (information about the state of the channel); and concatenated schemes (Reed-Solomon outer codes with either inner detection-only block codes or inner convolutional codes). In all cases, we derive the minimum signal-to-jammer energy ratio required to guarantee a desirable bit error rate as a function of the fraction of the band that is jammed when the number of interfering users is fixed, and the maximum number of users that can be supported by the system as a function of the fraction of the band that is jammed, when the signal-to-jammer energy ratio is fixed. (Author)

Descriptors :   *CODING, *CONVOLUTION, *NOISE JAMMING, *FREQUENCY AGILITY, *SPREAD SPECTRUM, *CHANNELS, FREQUENCY SHIFT, SPREAD SPECTRUM, DEMODULATION, INCOHERENCE, ERRORS, RATES, MODULATION, DECODING, ERASURE, PARALLEL ORIENTATION, ENERGY, RATIOS, SIGNAL TO NOISE RATIO, COMMUNICATIONS NETWORKS, NOISE(ELECTRICAL AND ELECTROMAGNETIC), THERMAL RESISTANCE

Subject Categories : Countermeasures

Distribution Statement : APPROVED FOR PUBLIC RELEASE