FIELD: radio engineering; demodulation of sixteen-position quadrature amplitude keyed signals.
SUBSTANCE: sixteen-position quadrature amplitude keyed (QAK-16) signal undergoes following operations to detect and eliminate false lock-on in phase: recovery of coherent carrier frequency of QAK-16 signal; measurement of projection for each demodulated signal point of QAK-16 signal onto quadrature axes formed by recovered coherent carrier frequency; if signal point projection is beyond limit values (that is U < -2 0r U > +2), quantity of such signal points is separately counted for each quadrature axis within count interval of m time steps.
EFFECT: enhanced noise immunity in demodulation of sixteen-position quadrature amplitude keyed signal.
1 cl, 4 dwg
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