A2537-002/01 February 2020 6-23 SEMCO Proprietary Information
Figure 6-33 shows both the Auto and Manual settings using the remote GUI. The user clicks on the Mod
Index box under Auto to enable Auto Mod Indexing. Clearing the Auto Mod Index box, clicking on
Advanced Settings and then entering a value between .3 (30%) and .4 (40%) enables Manual Mod
Indexing.
Figure 6-33
Modulation Indexing Settings on Remote GUI
6.8.6 Data Quality Metric/Encapsulation (DQM/DQE)
DQM is an estimate of the Bit Error Probability (BEP) of the demodulator’s received signal. Data Quality
Encapsulation (DQE) enables telemetry receivers to generate a serial data stream that includes a
standardized measurement of the real-time probability of error for a grouping of bits. This process provides
a standardized method for communicating data quality to Best Source Selectors.
DQM is determined over several symbols (Payload), encapsulated into the data stream, and calculated by
estimating BEP and computing a Likelihood Ratio (LR), which is then used to represent the data quality.
Using the calculated LR, the DQM is then calculated as a 16-bit unsigned integer. Table 6-2 shows the
relationship of BEP, LR & DQM.
Table 6-2
LR, DQM and Correlating BEP Values
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