THE NOISE IMMUNITY OF AN ELEMENTARY SIGNAL DURING PHASE-SHIFT KEYING,

Fluctuation noise may cause errors in the reception of phase-shift-keyed signals. The effect of noise level and clipping threshold at the phase-detector output on the probability of such errors is theoretically investigated. It is assumed that an additive Gaussian narrow-band noise is present at the IF-amplifier output. Formulas are derived for probabilities of spurious symbol, reversed positive instead of negative or vice versa symbol, and missing symbol. From these formulas, curves are plotted which show the above probabilities as functions of the signal-to-noise ratio and clipping threshold. The results are intended for designing phase-shift keying systems with erasing channel.