On the analogy of f.m.—f.m. systems the frequency spectrum of r.w.m.—f.m. signals is investigated and calculations are made to determine the amplitudes of a few significant frequency components. The expression for signal to noise ratio is also established for such a system. Signal to noise ratios for r.w.m.—f.m. systems and the equivalent f.m.—f.m. systems are calculated and compared for different values of channel bandwidths. It is concluded that an r.w.m.—f.m. system has better (S/N) characteristics than the equivalent f.m.-f.m. system.
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Sharma et al. (1969) studied this question.