Digital modulation quality monitor

摘要

A quality monitoring technique and detector is provided for checking the accuracy of modulation performed by a digital transmitter. The monitoring is performed without using a full receiver nor otherwise fully demodulating the signal to recover the baseband data. The modulated signal output by the transmitter is partially demodulated to a partial signal set on a single dimension of a two dimensional modulated signal matrix. The baseband signal is translated in accordance with a predetermined mapping format into the partial signal set on the single dimension for correlation against the partially demodulated signal. Failure to correlate indicates an error.