Digital Video Broadcasting (DVB); Framing structure, channel

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Additional resources for Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television

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3: Useful bitrate (Mbit/s) for non-hierarchical systems in 5 MHz channel Modulation QPSK 16-QAM 64-QAM Code rate 1/2 2/3 3/4 5/6 7/8 1/2 2/3 3/4 5/6 7/8 1/2 2/3 3/4 5/6 7/8 Guard interval 1/8 1/16 3,456 3,659 4,608 4,879 5,184 5,489 5,760 6,099 6,048 6,404 6,912 7,318 9,216 9,758 10,368 10,978 11,520 12,197 12,096 12,807 10,368 10,978 13,824 14,637 15,551 16,466 17,279 18,296 18,143 19,211 1/4 3,110 4,147 4,665 5,184 5,443 6,221 8,294 9,331 10,368 10,886 9,331 12,441 13,996 15,551 16,329 1/32 3,770 5,027 5,655 6,283 6,598 7,540 10,053 11,310 12,567 13,195 11,310 15,080 16,965 18,850 19,793 Spectrum efficiency of the transmission system remaining unaltered by the modification of the channel bandwidth, the useful bitrate offered by the system is slightly less than in traditional broadcast channel bandwidths.

NOTE: Values in italics are approximate values. 2 Out-of-band spectrum mask (for 8 MHz channels) The level of the spectrum at frequencies outside the nominal bandwidth can be reduced by applying appropriate filtering. Spectrum masks for cases where a transmitter for digital terrestrial television is co-sited with, and operating on a channel adjacent to, a transmitter for analogue television are given in figure 13 and table 18 for the following analogue television systems: - G/PAL/A2 and G/PAL/NICAM; - I/PAL/NICAM; - K/SECAM and K/PAL; - L/SECAM/NICAM.

Each OFDM symbol conveys one TPS bit. Each TPS block (corresponding to one OFDM frame) contains 68 bits, defined as follows: - 1 initialization bit; - 16 synchronization bits; - 37 information bits; - 14 redundancy bits for error protection. Of the 37 information bits, 31 are used. The remaining 6 bits shall be set to zero. 1 (2004-11) TPS transmission format The transmission parameter information shall be transmitted as shown in table 9. 8. The left most bit is sent first. 10 Cell identifier s48 to s53 all set to "0" See annex F s54 to s67 BCH code Error protection The TPS information transmitted in super-frame m' bits s25 - s39 always apply to super-frame m' + 1, whereas all other bits refer to super-frame m'.

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