Broadcast receiving system and method for processing broadcast signals

A broadcast receiving system comprising:

• a tuner for receiving a broadcast signal including a transmission frame,
• wherein a parade of data groups are received during slots within the transmission frame, the slots being basic time periods for multiplexing of mobile data and main data,
• wherein the data groups of the parade are assigned to the transmission frame, a total number of the data groups assigned to the transmission frame being a multiple of five,
• wherein a plurality of consecutive data groups in the parade are assigned to be spaced apart from one another within the transmission frame,
• wherein each of the data groups includes the mobile data, a transmission parameter, known data sequences and a plurality of regions including data blocks,
• wherein a first region of the plurality of regions includes a fourth data block, a fifth data block, a sixth data block and a seventh data block of the data blocks,
• wherein a second region of the plurality of regions includes a third data block and an eighth data block of the data blocks,
• wherein a third region of the plurality of regions includes a second data block and a ninth data block of the data blocks,
• wherein a fourth region of the plurality of regions includes a first data block and a tenth data block of the data blocks,
• wherein a first known data sequence of the known data sequences is located in the third data block of the data blocks,
• wherein a second known data sequence of the known data sequences and a third known data sequence of the known data sequences are located in the fourth data block of the data blocks,
• wherein a fourth known data sequence of the known data sequences is located in the fifth data block of the data blocks,
• wherein a fifth known data sequence of the known data sequences is located in the sixth data block of the data blocks, and
• wherein a sixth known data sequence of the known data sequences is located in the seventh data block of the data blocks;
• a demodulator for demodulating the broadcast signal;
• a transmission parameter detector for detecting the transmission parameter;
• a block decoder for symbol-decoding the mobile data included in the received broadcast signal in block units based upon the detected transmission parameter;
• and
• a Reed-Solomon (RS) frame decoder for building two-dimensional RS frames by gathering RS frame portions including the symbol-decoded mobile data,
• wherein a size of at least one of the two-dimensional RS frames is (187+P)×(N+2), wherein P and N are integers.