Digital broadcasting system and method of processing data in the digital broadcasting system
A digital broadcasting system and a data processing method are disclosed. A receiving system of the digital broadcasting system includes a receiving unit, a demodulator, an equalizer, a block decoder, and a RS frame decoder. The receiving unit receives a broadcast signal including mobile service data and main service data. The mobile service data may configure a RS frame. The RS frame includes at least one data packet for the mobile service data, RS parity generated based on the at least one data packet, and CRC checksum generated based on the at least one data packet and the RS parity. The demodulator converts RS frame data included in the broadcast signal received by the receiving unit into a baseband RS frame data. The equalizer performs channel equalization on the data demodulated by the demodulator. The block decoder performs symbol-decoding on the data channel-equalized by the equalizer in block units. The RS frame decoder performs CRC-decoding and RS-decoding on the decoded mobile service data in RS frame units, thereby correcting errors occurred in the mobile service data within the RS frame.
1. A method of transmitting broadcast data in a digital broadcast transmitting system, the method comprising:
Reed-Solomon (RS) encoding and Cyclic Redundancy Check (CRC) encoding, by an RS frame encoder, mobile service data, thereby outputting an RS frame, wherein the RS frame comprises an RS frame payload including the mobile service data, RS parity data added to bottom ends of columns of the RS frame payload, and CRC data added to right ends of rows of the RS frame payload including the RS parity data;
mapping, by a group formatting unit, data in the RS frame into data groups, adding known data sequences, transmission parameters and MPEG header data place holders to each of the data groups and deinterleaving the data groups;
replacing, by a packet formatter, the MPEG header data place holders with MPEG header data in the deinterleaved data groups and outputting mobile service data packets;
multiplexing, by a multiplexer, mobile service data packets and main service data packets including main service data; and
transmitting a transmission frame including the multiplexed data packets,
wherein the transmission frame comprises M consecutive sub frames, wherein each sub frame comprises N consecutive slots, wherein one of the slots transmits one of the data groups, and wherein M and N are integers greater than 1.
2. The method of claim 1 , wherein the transmission parameters are positioned between a first known data sequence and a second known data sequence of the known data sequences.
3. The method of claim 1 , wherein the transmission parameters include RS frame mode information for indicating a single frame mode or a dual frame mode.
4. The method of claim 3 , wherein each data group comprises regions A, B, C, and D, and wherein, if the RS frame mode information indicates the single frame mode, the data in the RS frame are mapped into regions A, B, C, and D of the data groups.
5. The method of claim 3 , wherein each data group comprises regions A, B, C, and D, and wherein, if the RS frame mode information indicates the dual frame mode, the data in the RS frame are mapped into regions A and B or regions C and D of the data groups.
6. The method of claim 1 , wherein M is 5 and N is 16.
7. A digital broadcast transmitting system comprising:
a Reed-Solomon (RS) frame encoder for RS encoding and Cyclic Redundancy Check (CRC) encoding mobile service data and outputting an RS frame, wherein the RS frame comprises an RS frame payload including the mobile service data, RS parity data added to bottom ends of columns of the RS frame payload, and CRC data added to right ends of rows of the RS frame payload including the RS parity data;
a group formatting unit for mapping data in the RS frame into data groups, adding known data sequences, transmission parameters and MPEG header data place holders to each of the data groups and deinterleaving the data groups;
a packet formatter for replacing the MPEG header data place holders with MPEG header data in the deinterleaved data groups and outputting mobile service data packets;
a multiplexer for multiplexing mobile service data packets and main service data packets including main service data; and
a transmitting unit for transmitting a transmission frame including the multiplexed data packets,
wherein the transmission frame comprises M consecutive sub frames, wherein each sub frame comprises N consecutive slots, wherein one of the slots transmits one of the data groups, and wherein M and N are integers greater than 1.
8. The digital broadcast transmitting system of claim 7 , wherein the transmission parameters are positioned between a first known data sequence and a second known data sequence of the known data sequences.
9. The digital broadcast transmitting system of claim 7 , wherein the transmission parameters include RS frame mode information for indicating a single frame mode or a dual frame mode.
10. The digital broadcast transmitting system of claim 9 , wherein each data group comprises regions A, B, C, and D, and wherein, if the RS frame mode information indicates the single frame mode, the data in the RS frame are mapped into regions A, B, C, and D of the data groups.
11. The digital broadcast transmitting system of claim 9 , wherein each data group comprises regions A, B, C, and D, and wherein, if the RS frame mode information indicates the dual frame mode, the data in the RS frame are mapped into regions A and B or regions C and D of the data groups.
12. The digital broadcast transmitting system of claim 7 , wherein M is 5 and N is 16.