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USER'S MANUAL. MO-170
4.10 DVB-T useful bit rates
In the following, we present the useful bit rates (Mbits/s or Mbps) for all
combinations of guard interval, constellation and convolutional code rates in DVB-T
systems and channels of 8, 7 and 6 MHz bandwidths. The useful bit rate does not
depend on the transmission mode (2k or 8k).
These tables are similar to Tables 17 (8 MHz), E.6 (7 MHz) and E.3 (6 MHz) in
document ETSI EN 300 744 v 1.5.1 (2004-11), but with 7 digits of accuracy instead of 2
or 3. This additional accuracy is necessary since the bit rate of the input transport
streams when operating in slave mode should not deviate more them a 0.1‰ from the
values shown herein, otherwise the MO-170 will not lock. For example, for QPSK, code
½ and guard interval of 1/4, the useful bit rate of DVB-T systems for 8 MHz bandwidth
channels is 4.9764706 Mbps, thus in slave mode the TS input bit rate to which the
modulator is able to sync should be greater than 4.975973 Mbps and lesser than 4.976968 Mbps.
Constellation
Convolutional code
QPSK
16QAM
64QAM
Table 1.- Useful bit rate (Mbps) for DVB-T modes and 8 MHz channel bandwidths.
12/2006
1/4
1/2
4,9764706
2/3
6,6352941
3/4
7,4647059
5/6
8,2941176
7/8
8,7088235
1/2
9,9529412
2/3
13,2705882
3/4
14,9294118
5/6
16,5882353
7/8
17,4176471
1/2
14,9294118
2/3
19,9058824
3/4
22,3941176
5/6
24,8823529
7/8
26,1264706
Guard interval
1/8
1/16
5,5294118
5,8546713
7,3725490
7,8062284
8,2941176
8,7820069
9,2156863
9,7577855
9,6764706
10,2456747 10,5561497
11,0588235 11,7093426 12,0641711
14,7450980 15,6124567 16,0855615
16,5882353 17,5640138 18,0962567
18,4313725 19,5155709 20,1069519
19,3529412 20,4913495 21,1122995
16,5882353 17,5640138 18,0962567
22,1176471 23,4186851 24,1283422
24,8823529 26,3460208 27,1443850
27,6470588 29,2733564 30,1604278
29,0294118 30,7370242 31,6684492
1/32
6,0320856
8,0427807
9,0481283
10,0534759
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