Constellation Diagram. Effects of interference on the constellation diagram. The ideal signal locations of a constellation diagram are pre defined generically depending on the modulation format chosen.
Instead of 90 degrees we now vary the signal by shifts of 45 degrees. With 8 different phases each shift can represent three bits one tribit at a time. It displays the signal as a two dimensional xy plane scatter diagram in the complex plane at symbol sampling instants.
Use this block to perform qualitative and quantitative analysis on modulated single carrier signals.
Instead of introducing the constellation diagram by simply presenting it i m going to try to have it emerge from the formulas of psk modulation. With 8 different phases each shift can represent three bits one tribit at a time. The angle of a point measured counterclockwise from the horizontal axis represents the phase shift of the carrier. A constellation diagram is a representation of a signal modulated by a digital modulation scheme such as quadrature amplitude modulation or phase shift keying.
