Backward compatible multi-carrier transmission system
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[0020] The following remarks relate to reference signs. Like letter references in different Figures designate like entities.
[0021]FIG. 1 is a functional block diagram representing the transmission chain of a DVB-T system within which the invention can be used. In all the description, the DVB-T system is used as an example but the invention applies to any other digital transmission system. The transmission chain in plain lines comprises:
[0022] an MPEG-2 source 10 for transmitting digital data (transport stream),
[0023] a channel coding and modulation block 11,
[0024] an OFDM frame adaptation block 12,
[0025] and OFDM and guard interval insertion block 13 to transform the signal from the frequency domain into the time domain,
[0026] a front end block 14 for performing digital to analog conversion and power transmission to the antenna 15 and
[0027] a pilot and TPS signals blocks 16 for inserting the pilot and TPS carriers into the main DVB-T stream.
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