Transmitting apparatus and receiving apparatus and controlling method thereof
A transmitting apparatus includes: a frame generator configured to generate a frame including a plurality of OFDM symbols; and a signal processor configured to signal-process the generated frame, wherein the plurality of OFDM symbols are included in a bootstrap, a preamble including an L1 basic and an L1 detail, and a payload, and wherein the bootstrap includes information on an FFT size of the OFDM symbols included in the preamble, a length of a guard interval (GI) inserted in the preamble, and a pattern of a preamble pilot inserted in the preamble, and information on an L1 basic mode.
1. A transmitting apparatus comprising:
at least on processor configured to:
generate a frame comprising a plurality of Orthogonal Frequency-Division Multiplexing (OFDM) symbols;
insert one or more pilots into the frame; and
insert one or more guard intervals (GIs) into the frame;
a transmitter configured to transmit a signal which is generated based on the frame,
wherein the generated frame comprises a bootstrap, a preamble and a payload,
wherein the payload comprises one or more subframes,
wherein a length of a guard interval (GI) inserted in the preamble is equal to a length of a GI inserted in a first subframe from among the one or more subframes, and
wherein a pilot density in the preamble is determined according to the length of the GI inserted in the preamble, the pilot density of the preamble being equal or greater than a pilot density in the first subframe.
2. The apparatus according to claim 1 , wherein the bootstrap comprises information on a Fast Fourier Transform (FFT) size of the one or more subframes, the length of the GI inserted in the preamble, and a pattern of a preamble pilot inserted in the preamble and an L1 basic mode, and
wherein the information on the L1 basic mode comprises information for providing certain robustness levels.
3. The apparatus according to claim 2 , wherein the information on the pattern of the preamble pilot comprises Dx information on the pattern of the preamble pilot, and
wherein a Dx of the pattern of a scattered pilot is determined as a Dx having the greatest density among Dxs of the pattern of the scattered pilot.
4. The apparatus according to claim 3 , wherein the Dx of the pattern of the preamble pilot is one of multiples of 3 and multiples of 4, and
wherein the Dx is a carrier index difference between adjacent carriers in which the preamble pilot or the scattered pilot is inserted.
5. The apparatus according to claim 4 , wherein the Dx is one of 3, 4, 6, 8, 12, and 16.
6. The apparatus according to claim 2 , wherein the information on the pattern of the preamble pilot comprises Dy information on the pattern of the preamble pilot, and
wherein the Dy is 1.
7. The apparatus according to claim 2 , wherein the pattern of a scattered pilot is represented as shown in a table below according to the length of the GI inserted in the payload and the FFT size of the one or more subframes included in the payload
GI
Pattern
Samples
8K FFT
16K FFT
32K FFT
GI1_192
192
SP32_2,
SP32_2,
SP32_2
SP32_4
SP32_4
SP16_2,
SP16_4
GI2_384
384
SP16_2,
SP32_2,
SP32_2
SP16_4
SP32_4
SP8_2, SP8_4
SP16_2,
SP16_4
GI3_512
512
SP12_2,
SP24_2,
SP24_2
SP12_4
SP24_4
SP6_2, SP6_4
SP12_2,
SP12_4
GI4_768
768
SP8_2, SP8_4
SP16_2,
SP32_2,
SP4_2, SP4_4
SP16_4
SP16_2
SP8_2, SP8_4
GI5_1024
1024
SP6_2, SP6_4
SP12_2,
SP24_2,
SP3_2, SP3_4
SP12_4
SP12_2
SP6_2, SP6_4
GI6_1535
1536
SP4_2, SP4_4
SP8_2, SP8_4
SP16_2, SP8_2
SP4_2, SP4_4
GI6_2048
2048
SP3_2, SP3_4
SP6_2, SP6_4
SP12_2, SP6_2
SP3_2, SP3_4
GI6_2432
2432
N/A
SP6_2, SP6_4
SP12_2, SP6_2
SP3_2, SP3_4
GI6_3072
3072
N/A
SP4_2, SP4_4
SP8_2, SP3_2
GI6_3648
3648
N/A
SP4_2, SP4_4
SP8_2, SP3_2
GI6_4096
4096
N/A
SP3_2, SP3_4
SP6_2, SP3_2
GI6_4864
4864
N/A
N/A
SP6_2, SP3_2.
8. The apparatus according to claim 2 , wherein the information on the FFT size of the one or more subframes included in the preamble, the length of the GI inserted in the preamble, and the pattern of the preamble pilot inserted in the preamble is represented as shown in a table below
Pilot
FFT
GI Length
Pattern
Size
(samples)
(Dx)
8192
2048
3
8192
1536
4
8192
1024
3
8192
768
4
16384
4096
3
16384
3648
4
16384
2432
3
16384
1536
4
16384
1024
6
16384
768
8
32768
4864
3
32768
3648
3
32788
3648
8
32768
2432
6
32768
1536
8
32768
1024
12
32768
768
16.
9. The apparatus according to claim 1 , wherein a pattern of a pilot inserted in the preamble is obtained based on the length of the GI inserted in the preamble and a Fast Fourier Transform (FFT) size of the one or more subframes.