DTV transmitting system and receiving system and method of processing broadcast signal

A method of processing digital broadcast data in a digital television (DTV) receiver, the method comprising:

• receiving, by a tuner, a broadcast signal, wherein the broadcast signal is processed in a DTV transmitter by:
• randomizing enhanced data,
• generating a Reed-Solomon (RS) frame by adding RS parity data and cyclic redundancy check (CRC) data to the randomized enhanced data,
• encoding the enhanced data in the RS frame with an encoding rate of 1/H, wherein H≧2,
• interleaving symbols corresponding to the encoded enhanced data in a symbol interleaver, wherein the symbol interleaver interleaves the symbols by:
• calculating L, where L=2m, where m is an integer,
• listing all permuted positions P′(i) in ascending order of i according to the following equation:
• P′(i)={89*i*(i+1)/2} mod L, wherein i is a natural number from 0 to L−1,
• discarding all P′(i) that are P′(i)≧B, wherein B is a block length of symbols input to the symbol interleaver, and
• condensing the list by, starting with a lowest i, shifting P(i) entries to the left to fill empty locations created by the discarding step,
• mapping enhanced data corresponding to the interleaved symbols into data groups, wherein each data group further includes known data sequences, signaling information and moving picture experts group (MPEG) header place holders,
• deinterleaving the data groups,
• replacing the MPEG header place holders in the deinterleaved data groups with MPEG header data and outputting enhanced data packets, and
• interleaving the enhanced data packets,
• demodulating, by a demodulator, the received broadcast signal;
• compensating, by an equalizer, channel distortion of the demodulated broadcast signal using at least one of the known data sequences;
• turbo-decoding, by a first decoder, the enhanced data in the equalized broadcast signal;
• and
• CRC-decoding and RS-decoding, by a second decoder, the turbo-decoded enhanced data.