RIGOL DG5000 Series - Manual (Page 107)

Chapter 5 IQ Modulation Output RIGOL
User’s Guide for DG5000 5-9
IQ Mapping
As mentioned before, IQ modulation vectorially bridges the digital signal and the
analog signal. IQ mapping is the description of the function of the bridge.
DG5000 provides versatile multilevel digital modulation types (4QAM, 8QAM, 16QAM,
32QAM, 64QAM, BPSK, QPSK, OQPSK, 8PSK, 16PSK).
MPSK signals (BPSK, QPSK, OQPSK, 8PSK, 16PSK) can be described by vector graphs,
and the endpoints of the vector are distributed on a circle. MQAM signals (4QAM,
8QAM, 16QAM, 32QAM, 64QAM) can be described by constellations. Constellation is
usually a rectangle or crisscross and when M=4, 8, 16, 32, 64, the constellations are
rectangles.
1. 4QAM (4-Quadrature Amplitude Modulation）
In internal modulation mode, press Mapping Select to select a modulation
type such as 4QAM.
The constellation of 4QAM is as shown below:
(Graph Mode) (Parameter Mode)
Press Mapping Edit to open the IQ mapping edit interface. As shown in the
figures above, 4QAM has four states, 00, 01, 10 and 11, corresponding to four
groups IQ components.