Parity interleaving apparatus for encoding variable-length signaling information and parity interleaving method using same

A signaling information transmission method, comprising:

• generating a parity bit string for parity puncturing by segmenting parity bits of an LDPC codeword whose length is 16200 and whose code rate is 3/15, into a plurality of bit groups, and by group-wise interleaving the bit groups using an order of group-wise interleaving;
• generating parity punctured parity bits by performing the parity puncturing using the parity bit string;
• performing quadrature phase shift keying (QPSK) modulation for generating a transmission signal by using an input signal corresponding to the parity punctured parity bits;
• and
• transmitting the transmission signal over a physical channel to a reception device, wherein the bit groups correspond to 36 bit groups each of which is composed of 360 bits, and the 36 bit groups indexed by 36 integer numbers from 9 to 44.