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Additional info for Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television
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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. 1 (2004-11) The masks shown in figure 13 cover the minimum protection needed for analogue television where the analogue and the digital television transmitters are co-sited and are applicable for cases where: - no polarization discrimination between digital and analogue television is used; and - the radiated power from both transmitters is the same (analogue sync-peak power equal to total power from the digital television transmitter).
This process is then repeated for each symbol in turn, producing a continuous stream of samples which constitute a complex baseband representation of the DVB-T signal. A subsequent up-conversion process then gives the real signal s( t ) centred on the frequency f C . However, care is needed in mapping the K values c m,l,k to the N IFFT coefficients X q . NOTE 2: The forward FFT may similarly be used in a demodulator. 1 (2004-11) Choice of "baseband" centre frequency The basis function for the middle emitted carrier ( k ′ = 0 ) is constant throughout each symbol, ψ m,l,(Kmax+Kmin) 2 = 1.
Scope of the TPS The TPS is defined over 68 consecutive OFDM symbols, referred to as one OFDM frame. Four consecutive frames correspond to one OFDM super-frame. 3). 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.
Digital Video Broadcasting (DVB); Framing structure, channel coding and modulation for digital terrestrial television
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