DAB3801 OFDM (DAB) Signal Generator
  
 

 

DAB-3801 is a test signal generator conformable to the European DAB (Digital Audio Broadcast) Standard ETS 300 401.

Features

  • Complies with DAB transmission modes I, II, III and IV
  • Outputs Quasi-random codes for measuring the bit error rate BER, which is needed to evaluate the receiver performances.
  • If several DAB-3801 units are connected, they can generate the same test signals with a time lag, enabling SFN (single frequency network) verification.
  • Has random access FIC memory for verification of any receiver systems which the user wants.
  • An internal backup circuit maintains FIC and panel setting written in the memory for four days at least.
  • Outputs the pre-determined MSC multiplex configuration information (MCI), broadcasting station name (LABEL), program type (PTY), etc. repeatedly as the fixed FIC data.
  • Internally replaceable I and Q signals allow the user to reverse the spectrum with a single switch when IF loop-back verification is changed into RF loop-back verification.
  • A built-in asynchronous sampling rate converter receives digital output signals from a CD, MD or DAT player.
    SPECIFICATIONS


Signal Format]

Compliant with the ETS 300 401 DAB system.

[Reference Oscillator]

Frequency 24.576MHz Stability ¡Ó3ppm

[Setting Ranges]

Modes and Setting Ranges

Transmission mode
Delay time
Main ID
Sub ID
Pseudo random code
Intermediate freq.
I
0 to 400
0 to 69
0 to 23
PN9, PN15, PN23 (CCITT conformable)
38.912MHz (See Specifications of IF Block.)
II
0 to 100
0 to 69
0 to 23
III
0 to 50
0 to 5
0 to 23
IV
0 to 200
0 to 69
0 to 23

Note: The delay time is specified in units of 1/1.024MHz.

[Specifications of Basic MSC Data]

Specifications of Basic MSC Data

Sub Channel
Bit rate
Audio mode
Audio data(L)
Audio data(R)
Protection Level
Code rate
size
Start Address
1
256kb/s
stereo
1kHz 0dB
1kHz 0dB
4
R¡Ü0.6
168CUs
0
2
224kb/s
stereo
1kHz 0dB
MUTE
3
R¡Ü0.5
168CUs
168
3
224kb/s
stereo
MUTE
1kHz 0dB
4
R¡Ü 0.6
140CUs
336
4
192kb/s
stereo
1kHz 0dB
2kHz 0dB
3
R¡Ü0.5
140CUs
476
5
192kb/s
stereo
4kHz 0dB
4kHz 0dB
4
R¡Ü0.6
116CUs
616
6
64kb/s
mono
1kHz 0dB
1kHz 0dB
3
R¡Ü0.5
48CUs
732
7
64kb/s
3
R=0.5
48CUs
780
8
24kb/s
2
R=0.375
24CUs
828
9
32kb/s
no coding
........
12CUs
852

*Internally generated PN codes are output as data through sub-channels 7, 8 and 9. *FIC does not contain the multiplex information carried through sub-channel 9.

[Specifications of OFDM Modulator Block]

Modulation Type Specifications

OFDM SIGNAL GENERATOR
MODE I
MODE II
MODE III
MODE IV
Modulation type
OFDM (£k/4-QPSK)
Number of OFDM symbols (L)
76
76
153
76
Number of carriers (K)
1,536
384
192
768
Frame Length (TF)
96ms
24ms
24ms
48ms
Modulated wave output sampling rate
4.096M Sample/sec
Modulated wave bandwidth
¡Ó768kHz

 

 

  
 
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