CN-114337688-B - Apparatus and method for generating broadcast signal frame

CN114337688BCN 114337688 BCN114337688 BCN 114337688BCN-114337688-B

Abstract

An apparatus and method for generating a broadcast signal frame are disclosed. An apparatus for generating a broadcast signal frame according to an embodiment of the present invention includes a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhancement layer signal, a power normalizer configured to reduce power of the multiplexed signal to a power level corresponding to the core layer signal, a time interleaver configured to generate a time interleaved signal by performing interleaving applied to both the core layer signal and the enhancement layer signal, and a frame constructor configured to generate a broadcast signal frame, wherein the broadcast signal frame includes a preamble for signaling time interleaver information corresponding to the time interleaver, wherein the preamble includes a field indicating a start position of a first complete FEC block corresponding to each of physical layer channels.

Inventors

Quan Xianheng
PU CHENGYI
LI ZAIRONG
Lin baomei
Jin Xingmo
XU NANHAO

Assignees

韩国电子通信研究院
韩国电子通信研究院

Dates

Publication Date: 20260421
Application Date: 20170908
Priority Date: 20170908

Claims (7)

1. A method of generating a broadcast signal frame, comprising: generating a multiplexed signal by combining the core layer signal and the enhancement layer signal; Reducing the power of the multiplexed signal to a power level corresponding to the core layer signal; generating a time-interleaved signal by performing time interleaving applied to both a core layer corresponding to the core layer signal and an enhancement layer corresponding to the enhancement layer signal, and Generating a broadcast signal frame, wherein the broadcast signal frame includes a preamble for signaling time interleaver information corresponding to the time interleaving, Wherein the time interleaving is performed by using one of a plurality of operation modes, Wherein the plurality of operation modes includes a first mode corresponding to no time interleaving, a second mode for performing convolutional time interleaving, and a third mode for performing hybrid time interleaving, Wherein the preamble includes a first field indicating a start position of a first complete FEC block for the first mode corresponding to each of the physical layer channels or a second field indicating a start position of a first complete FEC block for the second mode corresponding to each of the physical layer channels, and does not include any field indicating a start position of a first complete FEC block for the third mode, Wherein the second field has a longer length than the first field, Wherein the length of the first field is 15 bits and the length of the second field is 22 bits, Wherein when the time interleaving corresponds to the second mode, a start position of the first complete FEC block indicates a first unit for the first complete FEC block before convolutional time interleaving, and a position of the first unit for the first complete FEC block after convolutional time interleaving is signaled.
2. The method of claim 1, wherein the second field corresponds to a position after the convolutional time interleaving, wherein the position after the convolutional time interleaving is calculated by adding a position (C) before the convolutional time interleaving and a delay caused by the convolutional time interleaving.
3. The method of claim 2, wherein the delay caused by the convolutional time interleaving is calculated by using a position (l1d_plp_cti_start_row) of an interleaver selector corresponding to the convolutional time interleaving.
4. The method of claim 3, wherein, The delay caused by convolutional time interleaving is calculated by a modulo operation using: The sum of the position of the interleaver selector corresponding to the convolutional time interleaving and the position before the convolutional time interleaving (L1D_plp_CTI_start_row+C), and The number of delay lines (n_row) corresponding to the convolutional time interleaving.
5. The method of claim 4, wherein a position of the interleaver selector is signaled only for a core layer physical layer channel corresponding to the core layer and a position of the interleaver selector is not signaled for an enhancement layer physical layer channel corresponding to the enhancement layer.
6. The method of claim 5, wherein the position of the interleaver selector for the enhancement layer physical layer channel is calculated by using the position of the interleaver selector signaled for the core layer physical layer channel corresponding to the enhancement layer physical layer channel.
7. The method of claim 1, wherein the first field or the second field is signaled for a core layer physical layer channel and an enhancement layer physical layer channel, respectively.

Description

Apparatus and method for generating broadcast signal frame The present application is a divisional application of the application patent application of filing date 2017, 09, 08, application number "201780056062.6" titled "apparatus for generating a broadcast signal frame including a preamble indicating a start position of a first complete FEC block and method for generating a broadcast signal frame". Technical Field The present invention relates to a broadcast signal transmission/reception technique used in a broadcast system, and more particularly, to a broadcast signal transmission/reception system that multiplexes/demultiplexes and then transmits/receives two or more signals. Background Bit Interleaved Coded Modulation (BICM) is a bandwidth efficient transmission technique and is implemented in such a way that an error correction encoder, a bit-by-bit interleaver, and a higher order modulator are combined with each other. Since the BICM uses a Low Density Parity Check (LDPC) encoder or a Turbo encoder as an error correction encoder, the BICM may provide excellent performance using a simple structure. Furthermore, since the BICM can select modulation orders in various forms and the length and code rate of error correction codes, the BICM can provide a high level of flexibility. Because of these advantages, BICM has been applied to broadcasting standards such as DVB-T2 and DVB-NGH, and has a great possibility to be used for other next generation broadcasting systems. In order to support a plurality of services at the same time, multiplexing, that is, processing of mixing a plurality of signals is required. Among multiplexing techniques, techniques currently widely used include Time Division Multiplexing (TDM) adapted to divide and use time resources and Frequency Division Multiplexing (FDM) adapted to divide and use frequency resources. That is, TDM is a method of allocating time periods for respective services, and FDM is a technique of allocating frequency resource periods for respective services and then using them. Recently, a new multiplexing technology suitable for next generation broadcasting systems and providing greater flexibility and performance than TDM and FDM has been eagerly demanded. Disclosure of Invention Technical problem It is an object of the present invention to provide a broadcast signal frame structure that employs a new signal multiplexing technique capable of providing greater flexibility and performance than TDM and FDM. Further, it is an object of the present invention to efficiently perform signaling related to time interleaving, especially when convolutional time interleaving is used. Furthermore, it is an object of the present invention to effectively signal a field indicating the start position of the first complete FEC block of the physical layer channel in a subframe. Technical proposal To achieve the above object, the present invention provides an apparatus for generating a broadcast signal frame, comprising a combiner configured to generate a multiplexed signal by combining a core layer signal and an enhancement layer signal, a power normalizer configured to reduce power of the multiplexed signal to a power level corresponding to the core layer signal, a time interleaver configured to generate a time interleaved signal by performing interleaving applied to both the core layer signal and the enhancement layer signal, and a frame constructor configured to generate a broadcast signal frame, wherein the broadcast signal frame includes a preamble for signaling time interleaver information corresponding to the time interleaver. In this case, the preamble includes a field indicating a start position of a first complete FEC block corresponding to each of the physical layer channels. In this case, the start position of the first complete FEC block may be specified with respect to the first unit of each of the physical layer channels. In this case, when the operation mode of the time interleaver is a mode corresponding to the convolutional time interleaving, the start position of the first complete FEC block may indicate a first unit for the first complete FEC block before the convolutional time interleaving, and a position of the first unit for the first complete FEC block may be signaled after the convolutional time interleaving. In this case, the field indicating the start position of the first complete FEC block may correspond to a position after the convolutional time interleaving, which is calculated by adding the position (C) before the convolutional time interleaving and the delay caused by the convolutional time interleaving. In this case, the delay caused by the convolution time interleaving may be calculated by using the position (l1d_plp_cti_start_row) of the interleaver selector corresponding to the convolution time interleaving. In this case, the delay caused by the convolution time interleaving may be calculated by a modulo operation using the sum (l1d_plp_cti_start