C2Xpress DVB-C2 Signal Generator

DTC-382 TmmXpres
TmmXpress
ISDB-Tmm Signal Generator
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Essential Tools for Digital-TV Professionals
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DTC-382 TmmXpress Manual
April 2014
DTC-382 TmmXpress
Table of Contents
1. Introduction ................................................................................................................................... 4
2. Minimum PC Requirements .............................................................................................................. 4
3. TmmXpress Software Options........................................................................................................... 4
4. TmmXpress Software Installation ...................................................................................................... 4
5. TmmXpress Overview...................................................................................................................... 5
5.1. Launching TmmXpress ....................................................................................................................... 5
5.2. TmmXpress Application Layout ........................................................................................................... 5
6. Walkthrough: Generation of a ISDB-Tmm RF signal ............................................................................ 6
7. TmmXpress Application GUI ............................................................................................................ 6
7.1. Menu Bar........................................................................................................................................... 7
7.2. Tool Bar............................................................................................................................................. 7
7.3. General Parameters ........................................................................................................................... 8
7.4. Frame Information ............................................................................................................................. 8
7.5. Output settings................................................................................................................................... 9
7.5.1. I/Q Output Settings .................................................................................................................... 9
7.5.2. RF Output settings .................................................................................................................... 10
7.6. TS and Layer Parameters.................................................................................................................. 10
7.6.1. TS ISDB-T Parameters............................................................................................................... 10
7.6.2. Layer Parameters ..................................................................................................................... 11
7.7. Channel Fading ............................................................................................................................... 11
7.7.1. Channel Simulator ................................................................................................................... 11
7.7.2. AWGN .................................................................................................................................... 12
7.7.3. Multiple Transmission Paths Simulation ..................................................................................... 12
7.8. Status Bar ........................................................................................................................................ 12
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Essential Tools for Digital-TV Professionals
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DTC-382 TmmXpress
Revision History
Revision
Date
Changes
V1.1.0.5
2014.04.24 Added DTA-2115 support
V1.0.2.4
2014.02.25 Improved input file bitrate estimation
V1.0.1.3
2013.12.06 Fixed license check failure
V1.0.0.2
2013.11.25 Initial version
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DTC-382 TmmXpress
1. Introduction
The DTC-382 TmmXpress software package is designed to create ISDB-Tmm, ISDB-TSB or ISDB-T
signals in the form of I/Q sample files or RF output signals. TmmXpress can be installed by the user
on any qualifying PC, as specified in section 2.
ISDB-Tmm (Terrestrial Mobile Multimedia) broadcasting standard is based on ISDB-T and provides
options to concatenate blocks of 13- and 1-segments up to a total of 33 segments without the need
for a guard band.
TmmXpress allows you to make any combination of 13-, 3- and 1-segments and create signals of
up to 33 segments, specify the modulation parameters, select the sources, add noise, add multiple
channel simulation paths and generate an ISDB-Tmm, TSB or T signal.
The I/Q sample file can be processed by your application or it can be played out through the
StreamXpress.
Note: The TmmXpress functions depend on the installed options, as specified in section 3.
2. Minimum PC Requirements
Platform
Windows XP/2k3/Vista/7/8/2k8 with .NET
v2.0
Processor*
P4@2.0GHz (off-line generation)
Core i3/i5/i7 (real-time output)
* Or equivalent AMD processor
3. TmmXpress Software Options
The TmmXpress software requires a valid license to be installed. Without a valid license installed,
TmmXpress will operate in demo mode. In demo mode the option to generate signals is disabled
and a message is shown in the title-bar.
The DTC-382-ISDBTMM is installed as a combination of a DTC-370-ISDB and DTC-380-16MHZ.
The following options are available:
Option
Description
DTC-370-ISDB + DTC380-16MHZ
TmmXpress: Enables ISDB-Tmm/TSB/T RF output
DTC-371-IQ
Option to enable ISDB-Tmm/TSB/T I/Q sample generation, and playout of
I/Q samples through the StreamXpress
DTC-305-CM
Option to enable channel modelling
4. TmmXpress Software Installation
The TmmXpress software installation and TmmXpress license installation instructions can be found in
the ‘DTC-382 TmmXpress Installation’ document, which is included in the install package.
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5. TmmXpress Overview
5.1. Launching TmmXpress
The TmmXpress program can be started simply from the Start Menu:
Start > All Programs > DekTec > TmmXpress
A dialog appears that allows you to specify all parameters, to save and load parameter sets from
file, and to start generation of the ISDB-Tmm/TSB/T signal.
5.2. TmmXpress Application Layout
3
4
5
1
2
8
6
7
8
1. Menu Bar
The top area of the TmmXpress application contains two menus: File and Help.
2. Tool Bar
This area contains the following commands: New File, Open File, Save File, Close File, Clear,
Generate output and Cancel. This area also displays the name of the TmmXpress-settings file.
3. General Parameters
This area allows you to set the general ISDB-Tmm/TSB/T transmission parameters.
4. Frame Information
This area displays the ISDB-Tmm/TSB/T frame information.
5. Output Settings
This area allows you to specify the name, location, size and the format for the generated signals.
6. ISDB-T Settings
This area allows you to specify the number of segments, the parameters per layer and to select the
transport-stream source per block of segments.
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7. Channel Fading
This area allows you to add noise to the output signal and to specify multiple simulated fading
paths. For each path you can specify the channel-simulation parameters.
8. Status Bar
The status bar shows the validity of the ISDB-Tmm/TSB/T parameter set.
6. Walkthrough: Generation of a ISDB-Tmm RF signal
This walkthrough will guide you through the generation of an ISDB-Tmm RF signal.
- Start TmmXpress application
TmmXpress can be started from the start menu or using the desktop shortcut.
After start-up all ISDB-T parameters are set to default values.
- Set general ISDB-Tmm parameters
The sub-channel specifies the sub-channel of the centre segment of the connected ISDB-Tmm
segments.
- Select the source and set layer parameters
For each block of 13- 3- or 1-segments select the transport stream source, double click on the
source parameter and select a transport-stream file. If the file has valid TMCC information, these
ISDB-T parameters can be used by checking the “Use TMCC info” checkbox; otherwise the layermapping has to be specified manually.
If the TMCC is used, the layer parameters are fixed and cannot be changed.
To add a transport stream right-click the mouse in parameter area and select: Add TS.
Alternatively, the Insert key can be used.
To remove a complete TS, select the TS then right-click the mouse and select: Remove TS. The
shortcut key in this case is Delete.
To navigate through the layer parameters, use the arrow keys. After selection you can press the
Enter key to modify the parameter. When done, press the Enter key for further navigation.
- Set Output Format
Set the Format to RF, thereafter you can specify the output adapter, RF frequency and RF level.
- Check Status Bar
The status bar should indicate: Parameter set is valid. If otherwise, correct the settings.
- Save TmmXpress-Settings
Optionally save the current TmmXpress settings to file by pressing the save button
toolbar, or selecting Save File in the menu bar.
in the
- Generate RF signal
The generation of the RF signal can be started by pressing the Generate output button
toolbar, or selecting Generate output in the menu bar.
The generation can be stopped by pressing the Cancel generation button
selecting Cancel generation in the menu bar.
in the
in the toolbar, or
7. TmmXpress Application GUI
The following sections describe the parameter groups and areas in the GUI of the TmmXpress
application.
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7.1. Menu Bar
The menu bar contains two menus:
- File Menu
Submenu
Description
New
Create a new TmmXpress-settings file; Settings are set to default
Open …
Open an existing TmmXpress-settings file
Save
Save the current TmmXpress-settings to file
Save As …
Save the current TmmXpress-settings to file using a different file name
Close
Close the current file
Clear
Clear the current settings. All settings are set to default
Generate output
Start the generation of the ISDB-Tmm/TSB/T signal
Cancel generation
Cancel the generation of the ISDB-Tmm/TSB/T signal
- Help Menu
Submenu item
About
Description
Provide information about the current TmmXpress version
7.2. Tool Bar
- Toolbar buttons
Toolbar button
Description
Create a new TmmXpress-settings file; Settings are set to default
Open an existing TmmXpress-settings file
Save the current TmmXpress-settings to file
Close the current file
Clear the current settings; All settings are set to default
Start the generation of the ISDB-Tmm/TSB/T signal
Cancel the generation of the ISDB-Tmm/TSB/T signal
- Additional information
Toolbar info
Description
The name of the current TmmXpress-settings file.
During the generation of the output file(s) the progress is displayed.
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7.3. General Parameters
This group of parameters allows you to specify the general ISDB-Tmm/TSB/T parameters.
Parameter
Description
Bandwidth
Reference channel bandwidth: 6, 7 or 8 MHz
Sub Channel
Sub-channel number. For ISDB-Tmm this is the centre segment of the
connected ISDB-Tmm segments. This implicitly specifies the subchannel numbers of all 1-segment streams in the signal. The valid
range is 0 … 41.
RF Freq
Carrier frequency of the RF signal
Guard itv
Guard Interval length: 1/32, 1/16, 1/8 or 1/4
Mode
Transmission mode: Mode1 (2k), Mode 2 (4k) or Mode 3 (8k)
Note: if one of the sources is using TMCC-information, guard interval and transmission mode are fixed.
7.4. Frame Information
This group shows information on the OFDM-frame structure.
If the ISDB-T parameter set is valid, this area displays the derived frame information.
Parameter
Description
#Symbols
The number of symbols per OFDM-frame
Duration
The duration of one OFDM-frame in milliseconds
Sample rate
The sample rate in Hertz
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7.5. Output settings
This area allows you to specify the output settings. Dependant on the selected output format, other
selection fields are shown in this area.
- Format
Format
Description
I/Q Float32
Pairs of 32-bit floats in I, Q order
I/Q Int16
Pairs of signed 16-bit integers in I, Q order, little Endian:
Byte #0: Least-significant byte I
Byte #1: Most-significant byte I
Byte #2: Least-significant byte Q
Byte #3: Most-significant byte Q
Etc.
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<TAB>0x1c3f<LF>
0xfeA9<TAB>0x0073<LF>
RF
ISDB-Tmm/TSB/T RF output through the selected modulator port
7.5.1. I/Q Output Settings
In case the output type I/Q samples is selected (I/Q Float32, I/Q Int16 or I/Q Text), this area allows
the selection of the location and the base name of the generated I/Q sample file.
I/Q samples file settings
- #Frames
The number of OFDM-frames to be generated. The resulting file length and size are displayed.
- Append files
If not checked, TmmXpress overwrites the previously generated file. If checked, the TmmXpress
appends the new generated data to the end of the existing file.
- RMS
The Root Mean Square (RMS) of the complex samples. This value should be set as large as
possible to have the largest SNR, but small enough to avoid saturation. When a DekTec card is
used for play-out of the I/Q samples, the value 5000 is a good value.
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7.5.2. RF Output settings
In case the output type RF is selected this area allows the selection of the ISDB-Tmm/TSB/T capable
modulator card and the RF parameters.
ISDB-Tmm/TSB/T RF output settings
- Level
Level (in dBm) of the output signal.
7.6. TS and Layer Parameters
The ISDB-T parameter tab allows you to specify the transport stream, number of segments and
modulation parameters for each block of 13- 3- or 1-segments.
7.6.1. TS ISDB-T Parameters
Each light coloured row specifies the transport stream source and the common ISDB-T parameters of
a block of segments.
TS parameter
Description
TS
Displays the TS number
Broadcast type
Broadcast type: Television (13-segments), 1-segments-radio or 3-segments
radio
IIP-PID
PID of the IIP
Tune info
Displays the centre frequency of this block of segments
Partial
Partial reception: on or off
Emergency
Emergency: on or off
Source
Displays the selected source. When double clicking on the source, a dialog is
opened that allows you to select the source. If the selected transport stream
file has valid TMCC information, the modulation parameters and layer
mapping can be used by checking the “Use TMCC info” checkbox;
otherwise the layer-mapping has to be specified manually. If the TMCC
information is used, the layer parameters are fixed and cannot be changed.
To add more TS-es, right-click the mouse in the ISDB-T parameter area and select: Insert TS.
Alternatively, the Insert key can be used.
To remove a TS, select the TS then right-click the mouse and select: Remove TS. The shortcut key in
this case is Delete.
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To navigate through the TS parameters, use the arrow keys. After selection you can press the Enter
key to modify the parameter. When done, press the Enter key for further navigation.
7.6.2. Layer Parameters
Each dark coloured row below the TS parameters specifies the parameters for the hierarchical
layers.
Layer parameter
Description
Layer
Specifies the layer: A, B or C
#Segments
The number of segments for this layer: 0 … 13
Modulation
Modulation type used for this layer: DQPSK, QPSK, 16-QAM or 64-QAM
Code rate
Code rate used for this layer: 1/2, 2/3, 3/4, 5/6 or 7/8
Time Intlv
Time Interleaving length
Rate (bps)
Displays the bitrate
Note: if one of the sources is using TMCC-inform all parameters are fixed.
To navigate through the layer parameters, use the arrow keys. After selection you can press the
Enter key to modify the parameter. When done, press the Enter key for further navigation.
7.7. Channel Fading
The channel-fading tab allows you to specify the parameters for the channel simulator:
- White noise
- Reflections (multipath echo’s)
- Doppler effects because of a moving receiver
7.7.1. Channel Simulator
The Channel-Simulator group contains the overall enable box.
If checked, channel simulation is enabled and noise and fading-path parameters can be specified. If
unchecked, no channel simulation is applied.
The File Open button
The File Save button
enables you to load a previously saved set of channel-simulation settings.
allows you to save the current settings.
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7.7.2. AWGN
The AWGN group enables you to specify parameters for the addition of Gaussian-distributed noise
to the I/Q samples. If the Enable box is checked, the Signal-To-Noise ratio relative to the original
signal can be specified.
7.7.3. Multiple Transmission Paths Simulation
This group allows you to specify up to 32 transmission paths.
The following parameters can be specified per fading path:
Parameter
Description
Type
Echo Type: Constant Delay, Constant Doppler, Rayleigh fading with
Gaussian spectrum or Rayleigh fading with Jakes spectrum
Atten (dB)
Attenuation of the path in dB
Delay (us)
Delay of the path in microseconds
Phase (deg)
Phase shift of the path in degrees. Only for Constant Delay and Constant
Doppler path types
Speed (km/h)
Speed of the simulated moving receiver in km per hour. The resulting
Doppler frequency in Hz is displayed. Only for Constant Doppler, Rayleigh
Jakes and Rayleigh Gaussian path types.
If the Multiple Transmission Paths Simulation is disabled, it acts as a single path without attenuation
and without delay. If the Multiple Transmission Paths Simulation is enabled and no paths are
defined, it acts as a pure noise generator.
The sum of path power is displayed. The normalize button allows you to normalize the attenuation
of the paths such that the total power is 0dB again.
7.8. Status Bar
The Status Bar appears in the lower left corner of the TmmXpress application. The Status Bar
indicates whether the combination of current ISDB-Tmm/TSB/T parameters is valid.
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