# US 2015/0146804 A1 · Apparatus for transmitting broadcast signals, apparatus for receiving broadcast, signals, method for transmitting broadcast signals and method for receiving broadcast signals

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- Number: US 2015/0146804 A1
- Document ID: US20150146804A1
- Status: Published application
- Kind: A1
- Application number: 14/551,728
- Filed: 2014-11-24
- Published: 2015-05-28
- Earliest claimed: 2013-11-25
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jongseob BAEK; Jaehyung KIM; Woosuk KO; Sungryong HONG
- Web page: https://patentgrep.com/patent/US20150146804A1

## CPC

- H04H 20/72: of terrestrial networks
- H04B 7/0413: MIMO systems
- H04L 1/0071: {Use of interleaving (interleaving per se H03M13/27)}
- H04L 27/2601: {Multicarrier modulation systems}
- H04L 27/2627: {Modulators}
- H04L 27/2637: {with direct modulation of individual subcarriers}
- H04L 27/265: {Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators (H04L27/26524 takes precedence)}
- H04L 27/2647: {Arrangements specific to the receiver only (equalisation H04L27/01)}
- H04H: BROADCAST COMMUNICATION (multiplex communication H04J; pictorial communication aspects of broadcast systems H04N)
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A method and an apparatus for transmitting broadcast signals thereof are disclosed. The apparatus for transmitting broadcast signals comprises an encoder encoding service data, a time interleaver interleaving the encoded service data, a mapper mapping the interleaved service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame, a frequency interleaver interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, wherein the frequency interleaver calculates an interleaving address for the different interleaving-seed based on a main-PRBS sequence and a cyclic shifting value, a modulator modulating the frequency interleaved data by an OFDM scheme and a transmitter transmitting the broadcast signals having the modulated data, wherein an interleaving-seed is generated based on a cyclic shift value and an FFT size of the modulating.

## Claims

### Claim 1

A method for transmitting broadcast signals, the method comprising:
encoding service data;
time interleaving the encoded service data;
mapping the time interleaved service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame;
frequency interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, wherein the frequency interleaving further includes calculating an interleaving address for the different interleaving-seed based on a main-PRBS sequence and a cyclic shifting value;
modulating the frequency interleaved data by the OFDM scheme; and
transmitting the broadcast signals having the modulated data.

### Claim 2 (depends on 1)

The method of claim 1, wherein the interleaving address for the different interleaving-seed is calculated based on a maximum number of data cells for the frequency interleaving.

### Claim 3 (depends on 2)

The method of claim 2, wherein the maximum number of data cells is defined according to an FFT size of the modulating.

### Claim 4 (depends on 3)

The method of claim 3, wherein the plurality of OFDM symbols further include signaling information indicating the FFT size.

### Claim 5 (depends on 1)

The method of claim 1, wherein the cyclic shifting value is calculated for the every OFDM symbol pair based on a sub-PRBS sequence.

### Claim 6

An apparatus for transmitting broadcast signals, the apparatus comprising:
an encoder encoding service data;
a time interleaver interleaving the encoded service data;
a mapper mapping the interleaved service data into a plurality of OFDM (Orthogonal Frequency Division Multiplex) symbols to build at least one signal frame;
a frequency interleaver interleaving data in the at least one signal frame by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, wherein the frequency interleaver calculates an interleaving address for the different interleaving-seed based on a main-PRBS sequence and a cyclic shifting value;
a modulator modulating the frequency interleaved data by an OFDM scheme; and
a transmitter transmitting the broadcast signals having the modulated data, wherein an interleaving-seed is generated based on a cyclic shift value and an FFT size of the modulating.

### Claim 7 (depends on 6)

The apparatus of claim 6, wherein the interleaving address for the different interleaving-seed is calculated based on a maximum number of data cells for the frequency interleaving.

### Claim 8 (depends on 7)

The apparatus of claim 7, wherein the maximum number of data cells is defined according to an FFT size of the modulating.

### Claim 9 (depends on 8)

The method of claim 8, wherein the plurality of OFDM symbols further include signaling information indicating the FFT size.

### Claim 10 (depends on 6)

The apparatus of claim 6, wherein the cyclic shifting value is calculated for the every OFDM symbol pair based on a sub-PRBS sequence.

### Claim 11

A method for receiving broadcast signals, the method comprising:
receiving the broadcast signals;
demodulating the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme;
frequency de-interleaving the demodulated broadcast signals, wherein the demodulated broadcast signals is frequency interleaved by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, wherein an interleaving address for the different interleaving-seed is calculated based on a main-PRBS sequence and a cyclic shifting value;
de-mapping service data from at least one signal frame in the frequency de-interleaved broadcast signals;
time de-interleaving the de-mapped service data; and
decoding the time de-interleaved service data.

### Claim 12 (depends on 11)

The method of claim 11, wherein the interleaving address for the different interleaving-seed is calculated based on a maximum number of data cells for the frequency interleaving.

### Claim 13 (depends on 12)

The method of claim 12, the maximum number of data cells is defined according to an FFT size of the received broadcast signals.

### Claim 14 (depends on 13)

The method of claim 13, wherein the at least one signal frame further includes signaling information indicating the FFT size.

### Claim 15 (depends on 11)

The method of claim 11, wherein the cyclic shifting value is calculated for the every OFDM symbol pair based on a sub-PRBS sequence.

### Claim 16

An apparatus for receiving broadcast signals, the apparatus comprising:
a receiver receiving the broadcast signals;
a demodulator demodulating the received broadcast signals by an OFDM (Orthogonal Frequency Division Multiplex) scheme;
a frequency de-interleaver frequency de-interleaving the demodulated broadcast signals wherein the demodulated broadcast signals is frequency interleaved by using a different interleaving-seed which is used for every OFDM symbol pair comprised of two sequential OFDM symbols, wherein an interleaving address for the different interleaving-seed is calculated based on a main-PRBS sequence and a cyclic shifting value;
a de-mapper de-mapping service data from at least one signal frame in the frequency de-interleaved broadcast signals;
a time de-interleaver time de-interleaving the de-mapped service data; and
a decoder decoding the time de-interleaved service data.

### Claim 17 (depends on 16)

The apparatus of claim 16, wherein the interleaving address for the different interleaving-seed is calculated based on a maximum number of data cells for the frequency interleaving.

### Claim 18 (depends on 17)

The apparatus of claim 17, the maximum number of data cells is defined according to an FFT size of the received broadcast signals.

### Claim 19 (depends on 18)

The apparatus of claim 18, wherein the at least one signal frame further includes signaling information indicating the FFT size.

### Claim 20 (depends on 16)

The apparatus of claim 16, wherein the cyclic shifting value is calculated for the every OFDM symbol pair based on a sub-PRBS sequence.