Accession Number : ADA182136

Title :   Performance Analysis of Frequency Hopping MFSK (M-ary Frequency-Shift-Keying) Systems Employing Forward Error Control Coding in the Presence of Hostile Interference.

Descriptive Note : Final rept. May 86-Apr 87,

Corporate Author : LEE (J S) ASSOCIATES INC ARLINGTON VA

Personal Author(s) : Lee,Jhong S ; French,Robert H ; Miller,Leonard E

PDF Url : ADA182136

Report Date : Jun 1987

Pagination or Media Count : 191

Abstract : Error probability analyses are performed for a coded M-ary frequency-shift-keying (MFSK) system employing L hops per M-ary word frequency-hopping (FH) spread spectrum waveforms transmitted over a partial-band Gaussian noise jamming channel. The information bit error probabilities are obtained for a square-law linear combining demodulator and for a square-law adaptive gain control (AGC) demodulator, both with forward error control (FEC) coding under conditions of worst-case partial-band noise jamming, using exact analyses of the demodulator performance which include both thermal noise and jamming noise. Parametric performance curves are obtained for both block codes and convolutional codes with both binary and M-ary channel modulations. The results show that thermal noise can not be neglected in the analyses if correct determinations of the optimum order of diversity and the worst-case jamming fraction are to be obtained over the whole range of signal-to-thermal noise and signal-to-jamming ratios. It is shown that the combination of non-linear combining, M-ary modulation, and forward error control coding is an effective strategy against worst-case partial-band noise jamming. However, just as was found to be the case for uncoded systems, the linear combiner is ineffective in worst-case partial-band noise jamming. (Author)

Descriptors :   *MODULATION, *CODING, *DEMODULATORS, *ERROR CORRECTION CODES, *NONLINEAR SYSTEMS, *SPREAD SPECTRUM, *NOISE JAMMING, CHANNELS, CONVOLUTION, ERROR ANALYSIS, PROBABILITY, CONTROL, ERRORS, FORWARD AREAS, ENEMY, INTERFERENCE, CURVES(GEOMETRY), PARAMETRIC ANALYSIS, OPTIMIZATION, FREQUENCY, PERFORMANCE TESTS, NOISE(ELECTRICAL AND ELECTROMAGNETIC), THERMAL RESISTANCE

Subject Categories : Electrical and Electronic Equipment
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE