Description: should first group, will each make up two bit of a group, and then used four different carrier phase to represent. We ShuangBi of this information before the yuan with a representative, a bit after information with b is for. This ShuangBi two yuan information ab usually is arranged according to gray yards, it and the relationship between the carrier phase shown in table 1-1, vector relation as shown in figure 1-1 below. Figure 1-1 (a) said a way QPSK signal when the column picture, figure 1-1 (b) b way QPSK signal when said the vector diagram
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