Transmitting/receiving system and method of processing broadcast signal in transmitting/receiving system
An apparatus and method for transmitting digital broadcast signal are provided. The apparatus includes a group formatter to format a data group including mobile service data, where the group formatter further maps the mobile service data into a data group of interleaved format, adds N training sequences into a corresponding location of the data group of interleaved format, adds signaling data into the data group of interleaved format, inserts place holder bytes for MPEG header and non-systematic Reed-Solomon (RS) parity into the data group of interleaved format, and deinterleaves the mobile service data in the data group of interleaved format, a non-systematic RS encoder to non-systematic RS encode the mobile service data in the formatted data group and insert non-systematic RS parity obtained from the non-systematic RS encoding into the formatted data group.
1. A method for processing a digital broadcast signal at a transmitter, the method comprising:
formatting the data group including mobile service data, wherein formatting the data group comprises:
mapping the mobile service data into a data group;
adding training sequences into corresponding locations of the data group, wherein at least 5 of the training sequences are spaced M segments apart in the data group, wherein at least 1 of the training sequences is inserted between a first training sequence and a second training sequence of the at least 5 training sequences, and wherein M is an integer;
adding signaling data into the data group, wherein the signaling data are added between the first training sequence of the at least 5 training sequences and the at least 1 of the training sequences;
inserting place holder bytes for MPEG header and non-systematic Reed-Solomon (RS) parity into the data group; and
deinterleaving data in the data group;
non-systematic RS encoding the mobile service data in the formatted data group to insert the non-systematic RS parity into locations where the place holder bytes for the non-systematic RS parity were inserted in the formatted data group; and
transmitting a digital broadcast signal including the non-systematic RS-encoded mobile service data.
2. The method of claim 1 , further comprising:
Interleaving the non-systematic RS encoded mobile service data.
3. The method of claim 1 , wherein:
the at least 1 of the training sequences in the digital broadcast signal has a first K-symbol sequence and a second L-symbol sequence;
K is identical to L; and
the first K-symbol sequence and the second L-symbol sequence have a same data pattern.
4. The method of claim 1 , wherein the at least 5 of the training sequences in the digital broadcast signal have a same data pattern in common.
5. An apparatus for transmitting a digital broadcast signal, the apparatus comprising:
a group formatter configured to format a data group including mobile service data, wherein the group formatter is further configured to:
map the mobile service data into a data group;
add N training sequences into corresponding locations of the data group, wherein at least 5 of the training sequences are spaced M segments apart in the data group, wherein at least 1 of the training sequences is inserted between a first training sequence and a second training sequence of the at least 5 training sequences, and wherein M is an integer;
add signaling data into the data group, wherein the signaling data are added between the first training sequence of the at least 5 training sequences and the at least 1 of the training sequences;
insert place holder bytes for MPEG header and non-systematic Reed-Solomon (RS) parity into the data group; and
deinterleave data in the data group;
a non-systematic RS encoder configured to non-systematic RS encode the mobile service data in the formatted data group and to insert the non-systematic RS parity into locations where the place holder bytes for the non-systematic RS parity were inserted in the formatted data group; and
a transmission unit configured to transmit a digital broadcast signal including the non-systematic RS-encoded mobile service data.
6. The apparatus of claim 5 , further comprising:
a data interleaver configured to Interleave the non-systematic RS encoded mobile service data.
7. The apparatus of claim 5 , wherein:
the at least 1 of the training sequences in the digital broadcast signal has a first K-symbol sequence and a second L-symbol sequence;
K is identical to L; and
the first K-symbol sequence and the second L-symbol sequence have a same data pattern.
8. The apparatus of claim 5 , wherein the at least 5 of the training sequences in the digital broadcast signal have a same data pattern in common.