IQ Offset (Digital Demod)
(also called I/Q origin offset) indicates the magnitude of the carrier feedthrough signal. When there is no carrier feedthrough, IQ offset is zero (-infinity dB).
IQ origin offset is easily seen in the constellation diagram, as shown below:
In the above illustration, "x" is the center of the constellation diagram. When "x" occurs at the origin, the IQ offset is zero. When "x" is not at the origin, the IQ offset is the magnitude of the vector (in dB) between "x" and the origin.
The carrier feedthrough shown in the symbol table is computed only at the symbol times (the instant in time when symbols are detected). The computation does not include points between symbols. Therefore, the value of has no effect on this error data.
and do not compensate for I/Q origin offset, but they do report it in the table.
Unlike other demodulation formats, MSK Minimum Shift Keying uses all points to compute I/Q origin offset.
