Response of PLL Demodulator by Two Sinusoidal Inputs (Special Section on Nonlinear Theory and Its Applications)

概要

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In this paper, we subjects the case that frequency-shift-keying (FSK) modulation and phase locked loop (PLL) demodulator are used in frequency hopped spread spectrum (FH-SS) communication system. So the carrier frequencies of undesired transmitters may come into collision with the carrier frequency of desired transmitter in this communication system, we evaluate the response of PLL by two sinusoidal inputs so as to estimate how the response of PLL demodulator is affected by the collision of carrier frequencies. First, we compute the synchronization diagrams of PLL with two sinusoids. From this, it is indicated that allowable value of amplitude ratio of interference transmitter's signal to desired transmitter's signal decreases with increasing FSK modulation width of desired transmitter. Next, we calculated the output of PLL demodulator with two sinusoids. To this end, it is shown that the allowable value of amplitude ratio is bounded by a constant value even if FSK modulation width is enough small.
1994-11-25