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

• US 10,158,517 B2
• Filed: 09/01/2017
• Issued: 12/18/2018
• Est. Priority Date: 02/06/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Baek, Jongseob, Ko, Woosuk, Hong, Sungryong
• Primary Examiner(s): MEW, KEVIN D
• Application Number:
  US15/694,048
• Publication Number:
  US 20180076996A1
• Time in Patent Office: 473 Days
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0045 Arrangements at the receiver end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 27/2637 with direct modulation of individual subcarriers
• CPC Class Codes: H04L 27/26524 Fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators in combination with other circuits for demodulation
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0044 allocation of payload

Abstract

A method for transmitting broadcast signals includes encoding service data; mapping the encoded service data to symbols; building a signal frame including the symbols; and frequency interleaving the symbols in the signal frame. After an interleaving sequence is generated based on a toggle bit, a basic interleaving sequence, and a symbol offset, it is checked whether or not an address of the generated interleaving sequence is within a range of an OFDM symbol being frequency-interleaved. After checking the address, the symbols are frequency interleaved using the interleaving sequence, and when the FFT size is 32K, a single permutation is applied to the basic interleaving sequence, and when the FFT size is 8K or 16K, different permutations are applied to the basic interleaving sequence.

Claims

1. A method for transmitting broadcast signals, the method comprising:

encoding service data;

mapping the encoded service data to symbols;

building a signal frame including the symbols;

frequency interleaving the symbols in the signal frame,

wherein after an interleaving sequence is generated based on a toggle bit, a basic interleaving sequence, and a symbol offset, it is checked whether or not an address of the generated interleaving sequence is within a range of an OFDM symbol being frequency-interleaved,

wherein after checking the address, the symbols are frequency interleaved using the interleaving sequence, and

wherein when the FFT size is 32K, a single permutation is applied to the basic interleaving sequence, and when the FFT size is 8K or 16K, different permutations are applied to the basic interleaving sequence; and

modulating the frequency interleaved symbols and transmitting the modulated symbols via the broadcast signals.

2. An apparatus for transmitting broadcast signals, the apparatus comprising:

an encoder to encode service data;

a symbol mapper to map the encoded service data to symbols;

a framing block to build a signal frame including the symbols;

a frequency interleaver to frequency interleave the symbols in the signal frame,

wherein after an interleaving sequence is generated based on a toggle bit, a basic interleaving sequence, and a symbol offset, it is checked whether or not an address of the generated interleaving sequence is within a range of an OFDM symbol being frequency-interleaved,

wherein after checking the address, the symbols are frequency interleaved using the interleaving sequence, and

wherein when the FFT size is 32K, a single permutation is applied to the basic interleaving sequence, and when the FFT size is 8K or 16K, different permutations are applied to the basic interleaving sequence; and

a waveform generator to modulate the frequency interleaved symbols and to transmit the modulated symbols via the broadcast signals.