View State Definitions (Digital Demod)
For select digital modulation formats, the View State Definitions drop-down will show a "state definitions" table for the measurement digital format. The State Definitions table represents a constellation diagram with symbol bit definitions for each state.
Not all digital modulation formats support viewable state definition tables. The View State Definitions table is blank for non-supported digital formats.
The table is blank for digital formats that do not support viewable state definitions. The following digital modulation format state definitions are not supported: pi/4 DQPSK Differential Quadrature Phase Shift Keying: QPSK modulation using differential encoding of the digital information stream., MSK Minimum Shift Keying, DVB QAM Quadrature Amplitude Modulation, StarQAM, CPM Continuous Phase Modulation (FM Frequency Modulation).
Example QPSK State Definition
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FSK "Frequency Shift Key" State Definitions
State definitions for the FSK Frequency Shift Keying: A form of modulation using multiple carrier frequencies to carry the digital information. The most common is the two frequency FSK system using the two frequencies to carry the binary ones and zeros. modulation format are mapped to the FSK Meas/Ref Time eye diagram instead of the constellation diagram. In other words, the top entry corresponds to the top of the eye diagram; the bottom entry to the bottom of the eye diagram.
The following table shows a sample FSK state-definitions table and how to map the table to the constellation diagram:
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State Definitions Table 4-level FSK |
Corresponding Constellation Diagram |
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01 00 10 11 |
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Custom State Definitions
You can create user-defined custom States Definitions files using the Recall State Definitions property. For more information about State Definition files, see About State Definitions.
See Also
