12 isdb-t modulation settings – DekTec DTC-300 StreamXpress User Manual
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DTC-300-SP – StreamXpress
USER MANUAL
49
Format
Description
I/Q Text
Text (ASCII)-based format consisting of pairs of four-character
hexadecimal values with 0x prefix in I, Q order. The I and Q values are
separated by a TAB and I/Q pairs are separated by a linefeed.
Example:
0x2b45
0xfeA9
The I/Q file can be generated by DekTec T2Xpress or C2Xpress for example or be created by the
user.
#1 I/Q Samples:
This field reads the selected file and display the amount of I and Q samples.
#2 I/Q Rate:
This field allow the user to select the playout rate of the I/Q samples.
#3 I/Q Scaling:
This field allow the user to change the output amplitude of the I/Q samples.
#4 I/Q OFDM Interpolation:
OFDM interpolation should be the default mode. QAM interpolation is only useful if the I/Q signal
represents a QAM signal with sample rate equal to the symbol rate, and an RRC channel filter is
required like in standard QAM modulation. The key characteristic of a channel filter is that some
energy folds in the spectrum outside the symbol rate.
3.5.12 ISDB-T Modulation settings
If the DekTec Adaptor is licensed to support the ISDB-T (Integrated Services Digital Broadcasting-
Terrestrial) modulation, the user can select the ISDB-T modulation and change its parameters.
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