Modulation Measurements | Measurements |
QPSK Measurement
The next class of modulation quality measurements is when you don’t have a full WCDMA transmitter, but you want to measure the modulation quality anyway. This is a common test for RF components, for example. These are called QPSK measurements, as you would use a
Component measurements are similar to QAM/PSK measurements, except they are at a WCDMA chip rate of 3.84 MHz. Signature is capable of displaying:
•Vector Diagram & Constellation
•Power vs. Time
•EVM, Magnitude Error, Phase Error, or all 3 vs. Time
•Eye Diagrams (I, Q, or both)
•Optional Summary table with any diagram
•EVM (RMS, Peak, Peak Location)
•Magnitude & Phase Error
•IQ Offset
•Frequency Error
The graph types are set up using the Graph Type setup dialog shown below by pressing the button for the measurement you want. Each tab also has a check box that is usually in the lower left corner. This is an option to the measurement. In the dialog shown below, the option is to include a Summary table to each of the selected graphs.
Figure 5-27. QPSK Graph Type Setup Dialog
MS278XB OM |
