Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals

Patent metadata

Field	Value
Publication number	US-9979578-B2
Application number	US-201715693011-A
Country	US
Kind code	B2
Filing date	Aug 31, 2017
Priority date	Feb 20, 2014
Publication date	May 22, 2018
Grant date	May 22, 2018

Abstract

The present invention provides an apparatus of transmitting broadcast signals. The apparatus includes, an encoder for encoding service data, a bit interleaver for bit interleaving the encoded service data, a mapper for mapping the bit interleaved service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, an OFDM modulator for modulating data in the built at least one signal frame by an OFDM scheme and a transmitter for transmitting the broadcast signals having the modulated data.

First claim

What is claimed:

1. A method for transmitting broadcast signals by an apparatus for transmitting broadcast signals, the method comprising:
encoding service data;
bit interleaving the encoded service data, wherein the bit interleaving includes:
first interleaving the encoded service data, wherein the first interleaving interleaves parity bits of the encoded service data;
second interleaving a number of blocks in the first interleaved service data by using an interleaving pattern for a combination of a 16 Quadrature Amplitude Modulation (QAM) modulation type, a 6/15 code rate, and a 16200 code word length of the encoded service data, and wherein each block has 360 bits, wherein the interleaving pattern is represented as

6/15

π(j)-th

j-th block of
block of

Group-
Group-

wise
wise

Interleaver
Interleaver

output
input

0
12

1
13

2
15

3
30

4
27

5
25

6
11

7
34

8
 9

9
 4

10
31

11
22

12
 6

13
32

14
 7

15
21

16
17

17
 3

18
 1

19
26

20
10

21
33

22
19

23
 2

24
18

25
 5

26
28

27
35

28
 8

29
16

30
29

31
23

32
14

33
 0

34
20

35
24

36
36

37
37

38
38

39
39

40
40

41
41

42
42

43
43

44
44,

wherein a j-th block of the number of blocks is interleaved by a block unit according to the interleaving pattern;
third interleaving the second interleaved service data, wherein the third interleaving performs:
row-wise writing bits of each block in the second interleaved service data, wherein a number of rows is based on the modulation type, and
column-wise reading out 1 bit of the written each block, wherein a number of columns corresponds to 360;
building at least one signal frame including the bit interleaved service data;
modulating data in the built at least one signal frame by an Orthogonal Frequency Division Multiplex (OFDM) scheme; and
transmitting the broadcast signals having the modulated data.

2. The method of claim 1 , the method further includes:
mapping the bit interleaved service data to symbols based on the 16 QAM.

3. The method of claim 2 , wherein the service data is encoded according to the code rate.

4. The method of claim 3 , the method further includes:
time interleaving the bit interleaved service data based on a skip operation.

5

Assignees

• Lg Electronics Inc

Inventors

• Suh Yonghak
• Moon Sangchul
• Shin Jongwoong
• Ko Woosuk
• Hong Sungryoung

Classifications

• H04L1/0042

  Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape (H04L1/0067 takes precedence) · CPC title

• H04L27/2649

  Demodulators · CPC title

• H04L1/0071

  Use of interleaving (interleaving per se H03M13/27) · CPC title

• H04L27/2627 Primary

  Modulators · CPC title

• H03M13/2906

  using block codes (H03M13/2957 takes precedence) · CPC title