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Question of IQ measurement and IQ reference signal

Question asked by xjseu on Jun 12, 2007
Latest reply on Jun 15, 2007 by peiwen
I am confused  IQ measurement signal with IQ reference signal.
In the AN150-15,it says that the I-Q reference waveform is mathematically derived from the I-Q measured waveform recovered data bits, providing that the original data sequence can be recovered.
The BER and EVM is analyzed by comparing the IQ measured waveform  to the IQ reference waveform.
is IQ reference waveform equal to the orignal waveform in the transmitter?