Broadcast signal transmission device and broadcast signal transmission method which use broadcast signal frame for signaling reduced carrier coefficient

1 . An apparatus for transmitting a broadcast signal, comprising:

at least one processor; and

memory for storing at least one program executed by the at least one processor,

wherein the at least one program is configured to

generate a bootstrap for signaling a system bandwidth field, corresponding to a system bandwidth for a post-bootstrap, and a baseband sampling rate coefficient;

generate a preamble located immediately following the bootstrap in a broadcast signal frame; and

generate one or more subframes located immediately following the preamble in the broadcast signal frame,

wherein:

the preamble includes L1 signaling data, and the L1 signaling data includes at least one signaling field for signaling a reduced carrier coefficient, and

wherein the reduced carrier coefficient is set based on a ratio of an occupied bandwidth to a system bandwidth.

2 . The apparatus of claim 1 , wherein the reduced carrier coefficient includes 5 and 6 for a case in which the system bandwidth is 5 MHz.

3 . The apparatus of claim 1 , wherein the reduced carrier coefficient includes an integer that is equal to or greater than 0 and is equal to or less than 6.

4 . The apparatus of claim 1 , wherein the occupied bandwidth is calculated based on a number of carriers, which is calculated by subtracting a product of the reduced carrier coefficient and a carrier unit from a maximum number of carriers.

5 . The apparatus of claim 1 , wherein the at least one processor assigns 0 and 00 to the baseband sampling rate coefficient and the system bandwidth field, respectively, for a case in which the system bandwidth is 5 MHz.

6 . The apparatus of claim 5 , wherein the at least one processor assigns 11 to the system bandwidth field for a case in which the system bandwidth is greater than 8 MHz.

7 . The apparatus of claim 6 , wherein the at least one processor assigns 14 to the baseband sampling rate coefficient for a case in which the system bandwidth is 10 MHz,

assigns 29 to the baseband sampling rate coefficient for a case in which the system bandwidth is 15 MHz,

assigns 44 to the baseband sampling rate coefficient for a case in which the system bandwidth is 20 MHz,

assigns 59 to the baseband sampling rate coefficient for a case in which the system bandwidth is 25 MHz, and

assigns 74 to the baseband sampling rate coefficient for a case in which the system bandwidth is 30 MHz.

8 . A method for transmitting a broadcast signal, comprising:

generating one or more subframes;

generating a preamble corresponding to the one or more subframes; and

generating a bootstrap for signaling a system bandwidth field, corresponding to a system bandwidth for a post-bootstrap, and a baseband sampling rate coefficient,

wherein:

the preamble includes L1 signaling data, and the L1 signaling data includes at least one signaling field for signaling a reduced carrier coefficient,

wherein the reduced carrier coefficient is set based on a ratio of an occupied bandwidth to a system bandwidth.

9 . The method of claim 8 , wherein the reduced carrier coefficient includes 5 and 6 for a case in which the system bandwidth is 5 MHz.

10 . The method of claim 8 , wherein the reduced carrier coefficient includes an integer that is equal to or greater than 0 and is equal to or less than 6.

11 . The method of claim 8 , wherein the occupied bandwidth is calculated based on a number of carriers, which is calculated by subtracting a product of the reduced carrier coefficient and a carrier unit from a maximum number of carriers.

12 . The method of claim 8 , wherein generating the bootstrap comprises assigning 0 and 00 to the baseband sampling rate coefficient and the system bandwidth field, respectively, for a case in which the system bandwidth is 5 MHz.

13 . The method of claim 12 , wherein generating the bootstrap comprises assigning 11 to the system bandwidth field for a case in which the system bandwidth is greater than 8 MHz.

14 . The method of claim 13 , wherein generating the bootstrap comprises assigning 14 to the baseband sampling rate coefficient for a case in which the system bandwidth is 10 MHz,

assigning 29 to the baseband sampling rate coefficient for a case in which the system bandwidth is 15 MHz,

assigning 44 to the baseband sampling rate coefficient for a case in which the system bandwidth is 20 MHz,

assigning 59 to the baseband sampling rate coefficient for a case in which the system bandwidth is 25 MHz, and

assigning 74 to the baseband sampling rate coefficient for a case in which the system bandwidth is 30 MHz.

15 . An apparatus for receiving a broadcast signal, comprising:

at least one processor; and

memory for storing at least one program executed by the at least one processor,

wherein the at least one program is configured to

restore a bootstrap for signaling a system bandwidth field, corresponding to a system bandwidth for a post-bootstrap, and a baseband sampling rate coefficient;

restore a preamble located immediately following the bootstrap in a broadcast signal frame; and

restore one or more subframes located immediately following the preamble in the broadcast signal frame,

wherein:

the preamble includes L1 signaling data, and the L1 signaling data includes at least one signaling field for signaling a reduced carrier coefficient,

wherein the reduced carrier coefficient is set based on a ratio of an occupied bandwidth to a system bandwidth.

16 . The apparatus of claim 15 , wherein the reduced carrier coefficient includes 5 and 6 for a case in which the system bandwidth is 5 MHz.

17 . The apparatus of claim 15 , wherein the reduced carrier coefficient includes an integer that is equal to or greater than 0 and is equal to or less than 6.