FSK modulation: Flow graph, 772, 789, 798, 811, 844 power spectral density, 23 F9C-A radioteletype system, 66, 90-100, 124 time resolution, 34-37 Fokker-Planck equation, 934 FH/MFSK modulation, 464 Formal power series: band avoidance consideration, 468, 476 characteristic polynomial, 275 bandwidth, 464 initial condition polynomial, 275 broadband noise jamming, 471-475 linear recursion, 273-275 chip (subsymbols), 466, 497 Forney, G. D., 235 chip rate, 466, 472, 498-499 Fourier transform, 342 frequency domain structure, 466-469 Fredricsson, S. A., 297 frequency follower threat, 468, 471 Free-running clock, 16, 55, 57, 81 low probability of intercept aspect, 468 Frequency division duplexing (FDD), 1170, M-ary bands, 466-469 1172, 1186 repeat-back jamming, 468, 471 Frequency division multiple access (see signal-to-noise ratio, 471 FDMA) system with jammer, 465 Frequency-following jammer, 144, 468, 471 FH/MFSK subsymbols (diversity chips), 497 Frequency-hopping (see entries under FH) FH (frequency hopping) modulation, 11, Frequency identification algorithm, 987 464, 1035-1036, 1160-1161 Frequency non-selective fading, 443 versus direct-sequence, 1162-1164 Frequency-selective scintillation fading, 954-955 historical examples, 58, 63-64,7 76 hop rate, 466, 472, 498-499 Frequency synchronization: FH acquisition, 959-989 FH/PN modulation, 670, 1035-1036 of LPI receivers, 1070-1074 FH/PN/QASK modulation, performance in of non-coherent FH/MFSK systems, presence of partial-band multitone 1011-1025 jamming, 693-697 Frequency wobbling, historical example, 59 FN/PN/TH modulation, 1036 Freymodsson, B., 109 FH/QASK modulation: Friis, H. T., 86 performance in presence of partial-band Fryer, R. G., 76, 77 multitone jamming, 680-687 Fubini, E., 42, 122 performance in presence of partial-band Full-band noise jamming, 992 noise jamming, 690-693 FH/QPR modulation: Gain imbalance, 905, 916, 940, 941, 948 performance in presence of partial-band Galois field, 297, 373-379 Index Gaussian assumption, 411-414,418 Hard decision, 162-165, 168-