72 Chapter 9
Modulation Accuracy (Composite EVM) Measurements
Troubleshooting Hints
Troubleshooting Hints
Poor phase error often indicates a problem with the I/Q baseband
generator, filters, or modulator, or all three, in the transmitter circuitry
of the unit under test (UUT). The output amplifier in the transmitter
can also create distortion that causes unacceptably high phase error. In
a real system, a poor phase error will reduce the ability of a receiver to
correctly demodulate the received signal, especially in marginal signal
conditions.
If the error “Can not correlate to input signal” is shown, it
means that your measurement has failed to find any active channels
due to the lack of correlation with the input signal. The input signal
level or scramble code, or both, may need to be adjusted to obtain
correlation.
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