Terrestrial Transmission of Digital Television Signals (DVB-T) - Digital Video and Audio Broadcasting Technology - page 354

on the right. Therefore, the order from left to right is bit 0, bit 1 for QPSK,
bit 0, bit 1, bit 2, bit 3 for 16QAM and bit 0, bit 1, bit 2, bit 3, bit 4, bit 5
for 64QAM.

QPSK
10 00

11 01

16QAM
1000 1010 0010 0000

1001 1011 0011 0001

1101 1111 0111 0101

1100 1110 0110 0100

64QAM
100000

100010 101010 101000 001000 001010 000010 000000

100001 100011 101011 101001 001001 001011 000011 000001

100101 100111 101111 101101 001101 001111 000111 000101

100100 100110 101110 101100 001100 001110 000110 000100

110100 110110 111110 111100 011100 011110 010110 010100

110101 110111 111111 111101 011101 011111 010111 010101

110001 110011 111011 111001 011001 011011 010011 010001

110000 110010 111010 111000 011000 011010 010010 010000

Fig. 20.10. DVB-T mapping tables

20.5 The DVBT Modulator and Transmitter

Having dealt with the DVB-T standard and all its system parameters in de-
tail, the DVB-T modulator and transmitter can now be discussed. A
DVB-T modulator can have one or two transport stream inputs followed
by forward error correction (FEC) and this only depends on whether this
modulator supports hierarchical modulation or not. If hierarchical modula-
tion is used, both FEC stages are completely independent of one another
but are completely identical as far as their configuration is concerned. One
transport stream path with FEC is called the high priority path (HP) and