Constellation Diagram
Constellation Diagram – A display used within digital modulation to determine the health of the system. It consists of a plot of symbol values onto an X-Y display, similar to a vectorscope display. The horizontal axis is known as the In-Phase (I) and the vertical axis is known as the Quadrature Phase (Q) axis. The position of the symbols within the constellation diagram provides information about distortions in the QAM or QPSK modulator as well as about distortions after the transmission of digitally coded signals.
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