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1. ISDB-T |
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Partial Reception/Transmission-segment Identification (TMCC B27) |
Layer A | ||
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2. Payload |
3. MultiPath | ||
| Multi-path Channel |
Choice: Mode 1 | Mode 2 | Mode 3
Default: Mode 3
Double-click or use the drop-down menu to select the Mode.
Three system modes represent three different spacings between OFDM carrier frequencies offered by ISDB-T, catering for the different requirements of the distance between SFN stations and the robustness to Doppler shift during mobile-reception.
As shown in the following table
The available spacing between OFDM carrier frequencies are approximately 4 kHz, 2 kHz and 1kHz in mode 1, 2 and 3.
The number of carriers used varies depending on the mode
Information bit rate that can be transmitted remains the same in all three modes.
|
Transmission Parameter |
Mode 1 |
Mode 2 |
Mode 3 |
|---|---|---|---|
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No. of OFDM segments |
13 |
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Bandwidth |
5.575 MHz |
5.573MHz |
5.572MHz |
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Carrier interval |
3.968 kHz |
1.984 kHz |
0.992 kHz |
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No. of carriers |
1405 |
2809 |
5617 |
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Carrier modulation |
QPSK, 16QAM, 64QAM, DQPSK |
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Effective symbol length (Tu) |
252 μs |
504 μs |
1.008 ms |
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Guard-interval length (Tg) |
1/4, 1/8, 1/16, 1/32 of effective symbol length |
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No. of symbol per frame |
204 |
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Time interleave |
Maximum 4 values: 0, 0.1, 0.2, 0.4 sec |
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Frequency interleave |
Intra-segment and inter-segment interleaving |
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Inner code |
Convolutional coding (1/2, 2/3, 3/4, 5/6, 7/8) |
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Information bit rate |
3.65 Mbps - 23.23 Mbps |
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Hierarchical transmission |
Maximum 3 levels (Layer A, B, and C) |
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[:SOURce]:RADio:ISDBT[:BBG]:NFFT N2K|N4K|N8K
[:SOURce]:RADio:ISDBT[:BBG]:NFFT?
Choice: 6 MHz | 7 MHz | 8 MHz
Default: 6 MHz
Double-click or use the drop-down menu to select the bandwidth.
[:SOURce]:RADio:ISDBT[:BBG]:BANDwidth BW6|BW7|BW8
[:SOURce]:RADio:ISDBT[:BBG]:BANDwidth?
Choice: 1/4 | 1/8 | 1/16 | 1/32
Default: 1/8
Double-click or use the drop-down menu to select the Guard Interval.
The purpose of the guard interval is to introduce immunity to propagation delays, echoes and reflections, to which digital data is normally very sensitive.
ISDB-T has four choices of guard-interval length to enable better design of a single-frequency network (SFN).
[:SOURce]:RADio:ISDBT[:BBG]:GINTerval GI1D4|GI1D8|GI1D16|GI1D32
[:SOURce]:RADio:ISDBT[:BBG]:GINTerval?
Choice: 1 | 3 | 13
Default: 13
Double-click or use the drop-down menu to select the number of segments used.
[:SOURce]:RADio:ISDBT[:BBG]::SEGNumber SEG1|SEG3|SEG13
[:SOURce]:RADio:ISDBT[:BBG]::SEGNumber?
Choice: True | False
Default: True
Double-click or use the drop-down menu to enable or disable partial reception.
Partial Reception represents the reception of only one OFDM segment at the center of a group of segment.
This configuration has enabled an ISDB-TSB receiver to receive one-segment service embedded in a hierarchical television signal.
[:SOURce]:RADio:ISDBT[:BBG]:PARtial ON|OFF|1|0
[:SOURce]:RADio:ISDBT[:BBG]:PARtial?
Choice: ISDB-T | ISDB-Tsb
Default: ISDB-T
Double-click or use the drop-down menu to select the broadcasting type.
Layer A for ISDB-T.
A mixture of fixed-reception programs and mobile-reception programs is made possible through the application of hierarchical transmission achieved by band division within a channel. ”r;Hierarchical transmission” means that the three elements of channel coding, namely, the modulation scheme, the coding rate of convolutional error-correcting code, and the time interleaving length, can be independently selected.
Range: the total number of all layers equals to the Number of Segments.
Default: 1 (LayerA), 12 (Layer B), 0 (Layer C)
Set the number of segments assigned to this layer. When Partial Reception/Transmission-segment Identification (TMCC B27) is set to true, the segment count for layer A is 1. Otherwise, the segment count for layer A can be set to 1~ the number of segments.
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:SEGCount <val>
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:SEGCount?
Choice: DQPSK | QPSK | 16QAM | 64QAM
Default: QPSK (Layer A), 64QAM (Layer B)
Double-click or use the drop-down menu to select the modulation type in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:MODUlation DQPSK|QPSK|QAM16|QAM64
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:MODUlation?
Choice: 1/2 | 2/3 | 3/4 | 5/6 | 7/8
Default: 2/3 for Layer A, 3/4 for Layer B
Double-click or use the drop-down menu to select the code rate of convolutional coder in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:CRATe CR1D2|CR2D3|CR3D4|CR5D6|CR7D8
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:CRATe?
Choice:
For Mode 1: 0 | 4 | 8 |16
For Mode 2: 0 | 2 | 4 | 8
For Mode 3: 0 | 1 | 2 | 4
Default:
For layer B: 2, the others: 4.
Double-click or use the drop-down menu to select the length of time interleaving in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:ILEaver TI0|TI1|TI2|TI4|TI8|TI16
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:ILEaver?
Displays the current bit rate in layer A.
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:CBITrate?
Displays the maximum bit rate in layer A.
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:MBITrate?
Displays the PIDs assigned to layer A.
[:SOURce]:RADio:ISDBT[:BBG]:LAY1:PID?
Layer B for ISDB-T.
Range: the total number of all layers equals to the Number of Segments.
Set the number of segments assigned to this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:SEGCount <val>
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:SEGCount?
Choice: DQPSK | QPSK | 16QAM | 64QAM
Default: 64QAM for Layer B
Double-click or use the drop-down menu to select the modulation type in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:MODUlation DQPSK|QPSK|QAM16|QAM64
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:MODUlation?
Choice: 1/2 | 2/3 | 3/4 | 5/6 | 7/8
Default: 2/3 for Layer A, 3/4 for Layer B
Double-click or use the drop-down menu to select the code rate of convolutional coder in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:CRATe CR1D2|CR2D3|CR3D4|CR5D6|CR7D8
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:CRATe?
Choice:
For Mode 1: 0 | 4 | 8 |16
For Mode 2: 0 | 2 | 4 | 8
For Mode 3: 0 | 1 | 2 | 4
Default:
For layer B: 2;
The others: 4.
Double-click or use the drop-down menu to select the length of time interleaving in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:ILEaver TI0|TI1|TI2|TI4|TI8|TI16
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:ILEaver?
Shows the current bit rate in layer B.
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:CBITrate?
Shows the maximum bit rate in layer B.
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:MBITrate?
Shows the PIDs assigned to layer B.
[:SOURce]:RADio:ISDBT[:BBG]:LAY2:PID?
Layer C for ISDB-T.
Segment count for Layer C will be read only and determined by and of layer A and layer B.
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:SEGCount <val>
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:SEGCount?
Choice: DQPSK | QPSK | 16QAM | 64QAM
Default: QPSK
Double-click or use the drop-down menu to select the modulation type in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:MODUlation QPSK|QAM16|QAM64
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:MODUlation?
Choice: 1/2 | 2/3 | 3/4 | 5/6 | 7/8
Default: 2/3 for Layer C
Double-click or use the drop-down menu to select the code rate of convolutional coder in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:CRATe CR1D2|CR2D3|CR3D4|CR5D6|CR7D8
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:CRATe?
Choice:
For Mode 1: 0 | 4 | 8 |16
For Mode 2: 0 | 2 | 4 | 8
For Mode 3: 0 | 1 | 2 | 4
Default:
For layer B: 2;
The others: 4.
Double-click or use the drop-down menu to select the length of time interleaving in this layer.
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:ILEaver TI0|TI1|TI2|TI4|TI8|TI16
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:ILEaver?
Shows the current bit rate in layer C.
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:CBITrate?
Shows the maximum bit rate in layer C.
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:MBITrate?
Shows the PIDs assigned to layer C.
[:SOURce]:RADio:ISDBT[:BBG]:LAY3:PID?
Choice: On| Off
Default: On
Double-click or use the drop-down menu to select whether to allow the re-multiplex of the video streams in the application.
[:SOURce]:RADio:ISDBT[:BBG]:REMUlt ON|OFF|1|0
[:SOURce]:RADio:ISDBT[:BBG]:REMUlt?
Click 
on the right side of the cell to display the PID Assign window and assign the PIDs of the video stream to each layer. If Data Source Type is set to TS File and the File Location is instrument, PID Assign is disabled.
See PID Assign window for more details.
Choice: Demo File | TS File | Null TS Packet | Pattern | PN9 | PN15 | PN23
Default: Demo File
Double-click or use the drop-down menu to select which type to use as the data source.
Learn more about the different Data Source Types, refer to the page Data Source Type.
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:TYPE DEMOfile|FILE|NULL|PATtern|PN9|PN15|PN23
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:TYPE?
Choice: Local| Instrument
Default: Local
Couplings: Displayed only when the Data Source Type is TS File.
Double-click or use the drop-down menu to set the TS file location to local computer or instrument. As a best practice, save the TS file to the local computer and set File Location to Local.
Couplings: Displayed only when the Data Source Type is TS File.
Click on the right side of the cell to browse your computer and
select the TS file.
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:FILE "<file path/file name>"
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:FILE?
Choice: On | Off
Default: On
Double-click or use the drop-down menu to enable or disable packet stuffing.
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:STUFfing 0|1|ON|OFF
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:STUFfing?
Choice: NULL Packet Header (0x471FFF10) | SYNC Byte(0x47) | None
Default: SYNC byte (0x47)
Couplings: Displayed only when the Data Source Type is Pattern, PN9, PN15 or PN23.
Double-click or use the drop-down menu to determine whether a SYNC byte (0x47) or a NULL packet header(0x471FFF10) should be inserted into the test pattern.
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:SYNC 0|1|ON|OFF
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:SYNC?
Couplings: Displayed only when the Data Source Type is Pattern.
Enter the data bits to use in a test pattern.
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:PATTern <val>
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:PATTern?
Couplings: Displayed only when the Data Source Type is Demo File or TS File.
Displays the useful bit rate for the current setting.
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:UBITrate?
Couplings: Displayed only when the Data Source Type is Demo File or TS File.
Displays the stream bit rate for the current TS file.
[:SOURce]:RADio:ISDBT[:BBG]:PAYLoad:SBITrate?
Choice: Off | 1 Path | 2 Path | 3 Path | 4 Path
Default: Off
Click on the right side of the cell to open the Multi-path Channel dialog box. Use the dialog box to configure up to 4 static paths. For each path, you can set amplitude attenuation (r), time delay (t [ms]), phase offset (q [rad]), and frequency offset (w [kHz]).