Vv. Blatov et Yn. Pogoreltsev, THE SPECTRAL DENSITIES OF MULTIPOSITION FREQUENCY-SHIFT-KEYED SIGNALS, Telecommunications & radio engineering, 47(7), 1992, pp. 99-103
Analytic expressions are derived for calculating the spectral density
of multiposition continuous and discontinuous signals when they are ke
yed by a quasirandom telegraph signal. The spectral densities of four-
position signals are calculated and experimental results are given.