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Modulation Measurements Measurements
5-54 MS278XB OM
Composite Measurement
The next class of measurements are of the Composite signal. This measures the entire coded WCDMA
signal and provides metrics for the entire signal in both uplink and downlink modes. A standard
measurement of the transmitter is the Composite EVM (shown in the summary table). This is the EVM
of a signal that has all of the active codes combined together for the entire transmitter.
3GPP has “Composite EVM” conformance specifications similar to QPSK, but they look very different
due to the different signals. Each code is demodulated, then combined to get a composite waveform. The
composite measurement also supports HSDPA signals along with several additional measurements such
as:
• Scramble Code
• Peak Code Domain Error
• Power in the Synchronizing Channel (SCH)
Figure 5-31. Composite Graph Type Selection Dialog