WO2009155875A1 - 数字广播信号的发送装置、发送方法和发送系统 - Google Patents

数字广播信号的发送装置、发送方法和发送系统 Download PDF

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Publication number
WO2009155875A1
WO2009155875A1 PCT/CN2009/072464 CN2009072464W WO2009155875A1 WO 2009155875 A1 WO2009155875 A1 WO 2009155875A1 CN 2009072464 W CN2009072464 W CN 2009072464W WO 2009155875 A1 WO2009155875 A1 WO 2009155875A1
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Prior art keywords
data
unit
modulation
transmitting
differential
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PCT/CN2009/072464
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English (en)
French (fr)
Inventor
鲍东山
刘飞
王斌
姚洋
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北京新岸线移动多媒体技术有限公司
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Application filed by 北京新岸线移动多媒体技术有限公司 filed Critical 北京新岸线移动多媒体技术有限公司
Priority to US13/000,829 priority Critical patent/US20110103516A1/en
Priority to AU2009264457A priority patent/AU2009264457A1/en
Priority to EP09768800A priority patent/EP2302852A1/en
Publication of WO2009155875A1 publication Critical patent/WO2009155875A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/24Systems for the transmission of television signals using pulse code modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter only
    • H04L27/2627Modulators
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041Arrangements at the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0071Use of interleaving
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072Error control for data other than payload data, e.g. control data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/89Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving methods or arrangements for detection of transmission errors at the decoder

Definitions

  • the present invention claims a patent application with the application number 200810126458.6, the application date being June 27, 2008, and the invention name "Digital Broadcast Signal Transmission Device, Transmission Method, and Transmission System". The priority of this patent application is embodied in this application.
  • the present invention relates to the field of mobile multimedia broadcast technologies, and in particular, to a digital broadcast signal transmitting apparatus, and to a digital broadcast signal transmitting method and a digital broadcast signal transmitting system. Background technique
  • DAB Digital Audio Broadcast
  • DVD-H Digital Video Broadcasting Handheld
  • MediaFLO MediaFLO
  • the transmitting end when transmitting the digital broadcast signal, the transmitting end needs to transmit the first group of data through the primary traffic channel (MSC) and transmit the data through the fast information channel (FIC).
  • the data mainly includes audio, video, data, and the like
  • the service data mainly includes the service information of the service data of the configuration information.
  • the DAB system uses a unified four-phase differential phase shift keying (DQPSK) method for differential modulation.
  • the modulation method is fixed and very inflexible
  • the technical problem to be solved by the present invention is to provide a transmitting apparatus for a digital broadcast signal to solve the deficiencies of the DAB system.
  • the apparatus includes: at least one first coding unit, each of the first coding units configured to perform forward error correction coding on data in one subchannel; At least one time domain interleaving unit, each time domain interleaving unit receives the encoded data output by the first coding unit, and performs time domain interleaving on the encoded data.
  • the first multiplexing unit is configured to use each time domain interleaving unit.
  • the outputted interleaved data is multiplexed into MSC data; the second coding unit is configured to perform forward error correction coding on the second group of data to obtain FIC data; and a differential modulation unit is used to perform FIC data in the first modulation mode.
  • the MSC data is differentially modulated by the second modulation method; wherein, the modulation level of the first modulation mode is lower than the modulation level of the second modulation mode; and, the frame generation and transmission unit, the differential modulation generated by the differential modulation unit
  • the symbol sequence generation signal unit transmits a frame and transmits the signal unit transmission frame.
  • the FIC data and the MSC data can be separately differentially modulated by using two modulation methods, which greatly increases the flexibility of modulation.
  • the MSC data is modulated by a high-order modulation method, the frequency resource utilization is greatly improved.
  • the method includes: performing forward error correction coding and time domain interleaving independently on data of each subchannel; multiplexing time-domain interleaved data of each subchannel into MSC data; Forward error correction coding is performed to obtain FIC data; ⁇ first modulation mode differentially modulates FIC data, and second modulation mode performs differential modulation on MSC data; wherein, the modulation level of the first modulation mode is lower than the second modulation Modulation level of the mode; generating a signal unit transmission frame using the differential modulation symbol sequence generated by the differential modulation and transmitting the signal unit transmission frame.
  • the flexibility of modulation can be achieved.
  • the MSC data is modulated by a high-order modulation method, the frequency resource utilization is greatly improved.
  • a still further technical problem to be solved by the present invention is to provide a transmission system for digital broadcast signals.
  • the system comprises: N digital broadcast signal transmitting devices, wherein N is an integer greater than 1; and a frequency division multiplexing unit for N signal units generated by the N digital broadcast signal transmitting devices
  • the transmission frame is frequency division multiplexed into one baseband transmission frame transmission. Multiple digital broadcast signals can be transmitted using this system.
  • Figure 1 is a schematic illustration of an embodiment of an apparatus provided by the present invention
  • Figure 2 is a schematic illustration of another embodiment of the apparatus provided by the present invention
  • FIG. 3 is a schematic illustration of another embodiment of the apparatus provided by the present invention.
  • Figure 5 is a flow chart of another method embodiment provided by the present invention.
  • FIG. 6 is a schematic illustration of one system embodiment provided by the present invention. detailed description
  • FIG. 1 shows a structure of a digital broadcast signal transmitting apparatus, in which at least one first encoding unit S11, at least one time domain interleaving unit S12, a first multiplexing unit S13, a second encoding unit S14, The differential modulation unit S15 and the frame generation transmitting unit S16.
  • Each of the first coding units SI 1 is configured to perform forward error correction coding on data in one subchannel, and each time domain interleaving unit S12 receives the encoded data output by the first coding unit S11, and the encoded data. Perform time domain interleaving.
  • the first multiplexing unit S13 is configured to multiplex the interleaved data output by each time domain interleaving unit S12 into MSC data.
  • the second coding unit S14 is configured to perform forward error correction coding on the second group of data information to obtain FIC data.
  • the differential modulation unit S15 is configured to perform differential modulation on the FIC data in the first modulation mode, and differentially modulate the MSC data in the second modulation mode.
  • the modulation level of the first modulation mode is lower than the modulation level of the second modulation mode.
  • the frame generation transmitting unit S 16 generates a signal unit transmission frame using the differential modulation symbol sequence generated by the differential modulation unit S15 and transmits the signal unit transmission frame.
  • first coding unit S11 There are many forward error correction coding methods available to the first coding unit S11.
  • first coding unit S11 uses a Low Density Parity Check (LDPC) coding method.
  • LDPC Low Density Parity Check
  • the data in the subchannel is encoded.
  • second coding unit S14 there are many forward error correction coding methods available to the second coding unit S14.
  • second coding unit S14 uses a convolutional coding method to encode the second set of data.
  • the manner of time domain interleaving the data in the subchannel includes but is not limited to the following two types:
  • the time domain interleaving of the data in the subchannel is performed in a variable manner.
  • the time domain interleaving unit S12 may perform time domain interleaving on the received data directly according to the pre-configured fixed parameters after receiving the data from the first coding unit S11.
  • the time domain interleaving unit S12 needs to perform time domain interleaving on the received data according to the interleaving depth indicated by the configuration information after receiving the data from the first coding unit S11.
  • the first way the advantage is that the implementation is relatively simple, and the disadvantage is that the single interleaving method lacks flexibility.
  • the second way has the advantage that the interleaving method is diverse and flexible, and the disadvantage is that the implementation is relatively complicated.
  • the interleaved data of each subchannel output by each time domain interleaving unit S12 is formed into a Common Interleaved Frame (CIF) in the first multiplexing unit S13, that is, multiplexed into MSC data.
  • CIF Common Interleaved Frame
  • the differential modulation unit S15 the MSC data output from the first multiplexing unit S13 and the FIC data output from the second coding unit S14 are differentially modulated by different modulation schemes.
  • the FIC data can be differentially modulated by the DQPSK method.
  • the MSC data can be differentially modulated by the eight-phase differential phase shift keying (8DPSK) method, or the sixteen-phase differential amplitude and phase joint keying (16DAPSK) can be used.
  • the method is differential modulation, or differential modulation is performed in a higher order manner.
  • 8DPSK is: strong anti-interference ability, good error performance, high spectrum utilization, and can solve the phase ambiguity problem caused by octal absolute phase shift keying (8PSK) in the coherent demodulation process, so that the performance of the system can be improved. improve.
  • the advantage of 16DAPSK is that it has strong anti-interference ability, good error performance and high spectrum utilization. It can also solve the phase ambiguity problem caused by hexadecimal absolute phase shift keying (16PSK) in the coherent demodulation process.
  • the way to differentially modulate MSC data while the system is running includes but is not limited to the following two types:
  • the differential modulation unit S15 When mode A is selected, the differential modulation unit S15 directly performs differential modulation on the MSC data in a pre-configured fixed manner. When mode B is selected, the differential modulation unit S15 needs to differentially modulate the MSC data according to the modulation mode indicated by the configuration information.
  • the frame generation and transmission unit S16 may perform orthogonal frequency division multiplexing (OFDM) modulation on the differential modulation symbol sequence together with the phase reference symbol and the null symbol to generate respective OFDM symbols.
  • OFDM orthogonal frequency division multiplexing
  • the generated continuous OFDM symbols are then multiplexed into signal unit transmission frames; or the differential modulation symbol sequences are OFDM-modulated along with the phase reference symbols to respectively generate respective OFDM symbols, and then the generated continuous OFDM symbols are multiplexed with null symbols into
  • the signal unit transmits the frame.
  • the signal unit transmission frame includes a synchronization channel, an FIC, and an MSC.
  • Fig. 2 shows a more specific structure of a digital broadcast signal transmitting apparatus in an application scenario.
  • the data in the subchannel is time-interleaved in a variable manner, and the MSC data is differentially modulated in a fixed manner. Therefore, the interleaving depth used is indicated.
  • the parameters for defining the subchannel organization need to be set in the configuration information, including but not limited to the symbol mapping manner.
  • the punctured convolutional coding unit S24 performs punctured convolutional coding on the second set of data including the configuration information.
  • the LDPC coding unit S21 and the time domain interleaving unit S22 in series are independently performing LDPC coding and time domain interleaving on data of one subchannel; the main service channel multiplexing unit S23 is configured to output each time domain interleaving unit S22.
  • the interleaved data of each subchannel constitutes a CIF.
  • the capacity of the subchannel is calculated by a Capacity Unit (CU), and the size of the CU is 32 ⁇ n bits.
  • the LDPC coding unit S21 performs LDPC coding on the data in the subchannel, and the time domain interleaving unit
  • time domain interleaving unit S22 performs time domain interleaving on the encoded data between the LDPC coded blocks of the same subchannel according to the interleave depth indicated by the configuration information.
  • An optional manner is that the time domain interleaving unit S22 performs bit-based convolutional interleaving on the encoded data according to the interleaving depth.
  • the main service channel multiplexing unit S23 continuously aligns CUs of the same length, and inserts padding data between CUs of different lengths, thereby composing CIFs of time-interleaved data of each sub-channel.
  • the bit transmission frame multiplexing unit S25 performs bit transmission frame multiplexing on the CIF obtained by the primary traffic channel multiplexing unit S23 and the convolutionally encoded FIC data obtained by the punctured convolutional coding unit S24, thereby combining the two channels of data into one path.
  • the symbol mapping unit S26 uses a fixed mapping method (8PSK or 16PSK) to perform symbol mapping on CIF, that is, MSC data, and symbol mapping on FIC data in QPSK mode.
  • the modulating unit S27 performs corresponding differential modulation on the CIF and FIC data to obtain a sequence of differential modulation symbols. In an optional manner, the modulating unit S27 performs differential modulation on the same subcarrier of the adjacent OFDM symbol.
  • the OFDM symbol generating unit S28 is configured to perform OFDM modulation on the differential modulation symbol sequence together with the phase reference symbol and the null symbol, and respectively generate respective OFDM symbols.
  • the symbol transmission frame multiplexing unit transmits frames.
  • the spectrum of the data is dispersed and kept constant, and may be in each LDPC coding unit S21.
  • a first energy diffusion unit is added to perform energy diffusion on the data of each subchannel. As shown in FIG. 3, the first energy diffusion unit S31 performs bitwise modulo 2 according to the input sequence and the pseudo random sequence. After the addition, the data after the energy diffusion can be generated.
  • a second energy diffusion unit S32 can be added before the punctured convolutional coding unit S24 for energy diffusion of the second set of data.
  • a frequency domain interleaving unit S33 may be added between the mapping unit S26 and the modulating unit S27 to divide the symbols obtained by the mapping into OFDM symbol effective subcarriers K in different transmission modes into frequency blocks for frequency domain interleaving, and then the modulating unit S27 interleaves the frequency domain. The latter symbols are differentially modulated.
  • the frequency domain interleaving is block interleaving of symbols, and the interleave block size is equal to the effective number of subcarriers K.
  • FIG. 4 shows a flow of a method for transmitting a digital broadcast signal, the method comprising:
  • step 41 forward error correction coding and time domain interleaving are performed independently for the data of each subchannel.
  • step 42 the time-interleaved data of each sub-channel is multiplexed into MSC data, that is, the data interleaved by each sub-channel is formed into a CIF.
  • step 43 forward error correction coding is performed on the second set of data to obtain FIC data.
  • step 44 the first modulation mode differentially modulates the FIC data, and the second modulation mode differentially modulates the MSC data.
  • the modulation level of the first modulation mode is lower than the modulation level of the second modulation mode.
  • a signal unit transmission frame is generated using the differential modulation symbol sequence generated by the differential modulation and the signal unit transmission frame is transmitted.
  • An alternative method is to encode the data in the subchannel by using the LDPC coding method.
  • An alternative method is to encode the second set of data using a convolutional coding method.
  • the manner of time domain interleaving the data in the subchannel includes but is not limited to the following two types:
  • the time domain interleaving of the data in the subchannel is performed in a variable manner.
  • the received data may be directly interleaved in time domain according to the pre-configured fixed parameters.
  • the second mode when the data in the subchannel is interleaved, the received data needs to be time-interleaved according to the interleaving depth indicated by the configuration information.
  • the first way the advantage is that the implementation is relatively simple, and the disadvantage is that the single interleaving method lacks flexibility.
  • the second way has the advantage that the interleaving method is diverse and flexible, and the disadvantage is that the implementation is relatively complicated.
  • the FIC data can be differentially modulated by the DQPSK method
  • the MSC data can be differentially modulated by the 8DPSK method
  • the differential modulation can be performed by the 16DAPSK method
  • the differential modulation can be performed by a higher order method.
  • the way to differentially modulate MSC data while the system is running includes but is not limited to the following two types:
  • the MSC data when the MSC data is differentially modulated, the MSC data may be differentially modulated in a pre-configured fixed manner.
  • mode B when the MSC data is differentially modulated, the MSC data needs to be differentially modulated according to the modulation mode indicated by the configuration information.
  • the differential modulation symbol sequence may be OFDM-modulated along with the phase reference symbol and the null symbol to respectively generate respective OFDM symbols, and then the generated continuous OFDM symbols are multiplexed into signal unit transmission frames; or, the difference is
  • the modulation symbol sequence is OFDM modulated along with the phase reference symbols, respectively generating respective OFDM symbols, and then the generated continuous OFDM symbols are multiplexed into null signal symbols into signal unit transmission frames.
  • Fig. 5 shows a more specific process of the digital broadcast signal transmitting method in a certain application scenario.
  • the data in the subchannel is time-interleaved and the MSC data is differentially modulated in a fixed manner in a variable manner. Therefore, the interleaving depth used is indicated.
  • the parameters for defining the subchannel organization need to be set in the configuration information, including but not limited to the symbol mapping manner.
  • step 51 the FIC data is obtained by performing punctured convolutional coding on the second set of data including the configuration information at the FIC.
  • the MSC independently performs LDPC encoding and time domain intersection on the data of each subchannel.
  • the encoded data is time-interleaved according to the interleaving depth indicated by the configuration information between the LDPC coded blocks of the same subchannel.
  • An alternative way is to perform bit-based convolutional interleaving on the encoded data according to the interleaving depth.
  • step 53 the data interleaved by each subchannel is formed into a CIF.
  • the data interleaved by time domain of each subchannel is formed into a CIF.
  • step 54 the CIF and FIC data are subjected to bit transmission frame multiplexing, thereby combining the two channels of data into one data bit stream.
  • step 55 the FIC data is symbol mapped by the QPSK method, and the CIF is mapped by a higher order mapping method (8PSK or 16PSK).
  • step 56 the differential modulation symbol sequence ⁇
  • An alternative is to perform differential modulation on the same subcarrier of the adjacent OFDM symbol.
  • the differential modulation symbol sequence is OFDM modulated along with the phase reference symbols and the null symbols to generate respective OFDM symbols.
  • step 58 the generated consecutive OFDM symbols are multiplexed into signal unit transmission frames and transmitted.
  • the spectrum of the data is dispersed and kept stable, and the energy diffusion can be increased before step 52.
  • a frequency domain interleaving process may be added between step 55 and step 56 for frequency domain interleaving of the symbols obtained by the mapping.
  • the symbols obtained by the mapping are divided into blocks according to the number of effective subcarriers of the OFDM symbol in different transmission modes to perform frequency domain interleaving, and then the symbols interleaved in the frequency domain are differentially modulated.
  • the frequency domain interleaving is a block interleave of symbols, and the interleave block size is equal to the number of effective subcarriers.
  • Fig. 6 shows a structure of a digital broadcast signal transmitting system in which N digital broadcast signal transmitting means S61 and a frequency division multiplexing unit S62 are included, where N is an integer greater than one.
  • the digital broadcast signal transmitting apparatus S61 can employ any of the digital broadcast signal transmitting apparatuses described in the above embodiments.
  • the frequency division multiplexing unit S62 is configured to frequency-multiplex multiplex the N-channel signal unit transmission frames generated by the N digital broadcast signal transmitting devices S61 into one baseband transmission frame transmission.
  • the N-channel signal unit transmission frame may be generated by using the digital broadcast signal transmitting method described in each of the foregoing embodiments; and then, the N-channel signal unit transmission frame frequency is divided. It is transmitted as a baseband transmission frame.
  • An optional method is to move the N-channel signal unit transmission frame to N frequency points, and the interval between two adjacent frequency points is 1.544 MHz.
  • the present invention also provides an integrated circuit for implementing the method, apparatus or system of any of the above embodiments.
  • the present invention also provides a computer readable medium storing a program for implementing the method of any of the above embodiments.
  • the method or apparatus involved in the above embodiments may be used to generate a baseband signal or may be used to generate a non-baseband signal. That is to say, the baseband signal transmission frame generated by the above embodiment may be a baseband signal or a non-baseband signal.
  • DSPs digital signal processors
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • a general purpose processor may be a microprocessor, but in another case the processor may be any conventional processor, controller, microcontroller or state machine.
  • the processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other This structure.
  • the steps of the method described in connection with the above disclosed embodiments may be embodied directly in hardware, a software module executed by a processor, or a combination of the two.
  • Software modules may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
  • a typical storage medium is coupled to the processor such that the processor can read information from the storage medium and can write information to the storage medium.
  • the storage medium is an integral part of the processor.
  • the processor and storage medium may be present in an ASIC.
  • the ASIC may exist in a subscriber station.
  • the processor and storage medium may reside as discrete components in the subscriber station.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Detection And Prevention Of Errors In Transmission (AREA)
  • Error Detection And Correction (AREA)
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Description

数字广播信号的发送装置、 发送方法和发送系统 本申请要求申请号为 200810126458.6、 申请日为 2008年 6月 27日、 发 明名称为 《数字广播信号的发送装置、 发送方法和发送系统》 的专利申请的 优先权, 该专利申请的内容在本申请中均有体现。 技术领域
本发明涉及移动多媒体广播技术领域, 尤其涉及一种数字广播信号发送 装置, 还涉及一种数字广播信号发送方法和一种数字广播信号发送系统。 背景技术
目前, 全球主流手机电视 /移动多媒体广播传输标准有数字音频广播
( Digital Audio Broadcast, DAB )系列标准、 手持设备数字电视广播( Digital Video Broadcasting Handheld , DVB-H )标准以及 MediaFLO标准。 在信道带 宽方面, DAB 系列标准使用 1.712MHz 带宽的工作模式, DVB-H标准和 MediaFLO标准使用多种带宽的工作模式。
在 DAB 系统中, 发送端在发送数字广播信号时, 需要通过主业务信道 ( MSC )传输第一组数据, 通过快速信息信道(FIC )传输数据。 数据主要 包括音频、 视频、 数据等业务数据主要包括配置信息所述业务数据的业务信 息。 无论是对 MSC, DAB系统都釆用统一的四相差分相移键控(DQPSK ) 方式进行差分调制。 其不足之处主要有两点:
1、 调制方式固定, 很不灵活;
2、 只釆用低阶差分调制, 频率资源利用率低。 发明内容
有鉴于此, 本发明要解决的技术问题是提供一种数字广播信号的发送装 置, 以解决 DAB系统的不足。
在数字广播信号发送装置的一个实施例中, 该装置包括: 至少一个第一 编码单元,每个第一编码单元用于对一个子信道中的数据进行前向糾错编码; 至少一个时域交织单元, 每个时域交织单元接收一个第一编码单元输出的编 码后的数据, 对编码后的数据进行时域交织; 第一复用单元, 用于将各时域 交织单元输出的交织后的数据复用成 MSC数据; 第二编码单元, 用于对第 二组数据进行前向纠错编码, 获得 FIC数据; 差分调制单元, 用于釆第一调 制方式对 FIC数据进行差分调制, 釆用第二调制方式对 MSC数据进行差分 调制; 其中, 第一调制方式的调制级别低于第二调制方式的调制级别; 和, 帧生成发送单元, 利用差分调制单元生成的差分调制符号序列生成信号单元 传输帧并发送所述信号单元传输帧。 在该实施例中, 可以釆用两种调制方式 对 FIC数据和 MSC数据分别进行差分调制, 这样就大大增加了调制的灵活 性。 而且, 由于釆用高阶的调制方式对 MSC数据进行调制, 因此大大提高 了频率资源利用率。
本发明要解决的另一个技术问题是提供一种数字广播信号的发送方法。 在一些实施例中, 该方法包括: 对每个子信道的数据独立地进行前向纠错编 码和时域交织; 将各子信道时域交织后的数据复用成 MSC数据; 对第二组数 据进行前向纠错编码, 获得 FIC数据; 釆第一调制方式对 FIC数据进行差分调 制, 釆用第二调制方式对 MSC数据进行差分调制; 其中, 第一调制方式的调 制级别低于第二调制方式的调制级别; 利用差分调制生成的差分调制符号序 列生成信号单元传输帧并发送所述信号单元传输帧。 在该实施例中, 可以釆 了调制的灵活性。 而且, 由于釆用高阶的调制方式对 MSC数据进行调制, 因 此大大提高了频率资源利用率。
本发明要解决的更进一步的技术问题是提供一种数字广播信号的发送 系统。 在一些实施例中, 该系统包括: N个数字广播信号发送装置, 其中 N 为大于 1的整数; 和一个频分复用单元, 用于将 N个数字广播信号发送装置生 成的 N路信号单元传输帧频分复用成一路基带传输帧发送。 利用该系统可以 发送多路数字广播信号。 附图说明
图 1是本发明提供的一个装置实施例的示意图; 图 2是本发明提供的另一个装置实施例的示意图;
图 3是本发明提供的另一个装置实施例的示意图
图 4是本发明提供的一个方法实施例的流程图;
图 5是本发明提供的另一个方法实施例的流程图;
图 6是本发明提供的一个系统实施例的示意图。 具体实施方式
图 1示出了数字广播信号发送装置的一种结构, 在该装置 100中包括至少 一个第一编码单元 Sll、 至少一个时域交织单元 S12、 第一复用单元 S13、 第 二编码单元 S14、 差分调制单元 S15和帧生成发送单元 S16。
每个第一编码单元 SI 1用于对一个子信道中的数据进行前向糾错编码, 每个时域交织单元 S12接收一个第一编码单元 S11输出的编码后的数据, 对编 码后的数据进行时域交织。
第一复用单元 S13用于将各时域交织单元 S12输出的交织后的数据复用 成 MSC数据。 第二编码单元 S14用于对第二组数据信息进行前向纠错编码, 获得 FIC数据。 差分调制单元 S15用于釆第一调制方式对 FIC数据进行差分调 制, 釆用第二调制方式对 MSC数据进行差分调制; 其中, 第一调制方式的调 制级别低于第二调制方式的调制级别。 帧生成发送单元 S 16利用差分调制单 元 S15生成的差分调制符号序列生成信号单元传输帧并发送所述信号单元传 输帧。
其中, 可供第一编码单元 S11使用的前向纠错编码方法有很多, 一种可 选的方法是第一编码单元 S11 釆用低密度奇偶校验 ( Low Density Parity Check, LDPC )编码方法对子信道中的数据进行编码。 同样, 可供第二编码 单元 S14使用的前向纠错编码方法也有很多, 一种可选的方法是第二编码单 元 S14釆用卷积编码方法对第二组数据进行编码。
在系统运行时, 对子信道中的数据进行时域交织的方式包括但不限于下 述两种:
一、 釆用固定的方式对子信道中的数据进行时域交织;
二、 釆用可变的方式对子信道中的数据进行时域交织。
选用第一种方式时, 时域交织单元 S12从第一编码单元 S11收到数据后 直接按预先配置好的固定参数对收到的数据进行时域交织即可。 选用第二种 方式时, 时域交织单元 S12从第一编码单元 S11收到数据后需要根据配置信 息所指示的交织深度对收到的数据进行时域交织。 第一种方式, 其优点是实 现相对简单, 缺点是交织方式单一缺乏灵活性。 第二种方式, 其优点是交织 方式多样比较灵活, 缺点是实现相对复杂。
各时域交织单元 S12输出的各子信道交织后的数据在第一复用单元 S13 中被组成公共交织帧 (Common Interleaved Frame, CIF ), 即复用成 MSC数 据。 在差分调制单元 S15, 釆用不同的调制方式对第一复用单元 S13输出的 MSC数据和第二编码单元 S14输出的 FIC数据进行差分调制。
对 FIC数据可以釆用 DQPSK方式进行差分调制,对 MSC数据可以釆用 八相差分相移键控 ( 8DPSK )方式进行差分调制, 也可以釆用十六相差分幅 度和相位联合键控 ( 16DAPSK )方式进行差分调制, 或者釆用更高阶的方式 进行差分调制。 8DPSK的优点在于, 抗干扰能力强、 误码性能好、 频谱利用 率高, 而且能够地解决八进制绝对移相键控 ( 8PSK )在相干解调过程中产生 的相位模糊问题, 使系统的性能得以提高。 16DAPSK 的优点在于, 抗干扰 能力强、 误码性能好、 频谱利用率高, 也能够地解决十六进制绝对移相键控 ( 16PSK )在相干解调过程中产生的相位模糊问题。
在系统运行时, 对 MSC数据进行差分调制的方式包括但不限于下述两 种:
A、 釆用固定的方式对 MSC数据进行差分调制;
B、 釆用可变的方式对 MSC数据进行差分调制。
选用方式 A时,差分调制单元 S15直接按预先配置好的固定方式对 MSC 数据进行差份调制即可。 选用方式 B时, 差分调制单元 S15需要根据配置信 息所指示的调制方式对 MSC数据进行差分调制。
帧生成发送单元 S16从差分调制单元 S15收到差分调制符号序列后, 可 以将差分调制符号序列连同相位参考符号和空符号进行正交频分复用 ( OFDM )调制, 分别生成各自的 OFDM符号, 然后将生成的连续 OFDM 符号复用成信号单元传输帧; 或者, 将差分调制符号序列连同相位参考符号 进行 OFDM调制 , 分别生成各自的 OFDM符号, 然后将生成的连续 OFDM 符号连同空符号复用成信号单元传输帧。 其中, 所述信号单元传输帧包括同 步信道、 FIC和 MSC。 图 2示出了在某一应用场景下数字广播信号发送装置的一种更具体的结 构。 在该应用场景下, 釆用可变的方式对子信道中的数据进行时域交织、 釆 用固定的方式对 MSC数据进行差分调制, 因此需要对釆用的交织深度加以指 示。 在配置信息中需要设置用于定义子信道组织的参数, 所述参数包括但不 限于符号映射方式。
在 FIC , 删余卷积编码单元 S24对包括配置信息在内的第二组数据进行删 余卷积编码。
在 MSC , —路串联的 LDPC编码单元 S21和时域交织单元 S22独立地对一 个子信道的数据进行 LDPC编码和时域交织; 主业务信道复用单元 S23用于将 各时域交织单元 S22输出的各子信道交织后的数据组成 CIF。
其中, 子信道的容量以容量单元(Capacity Unit, CU )计算, CU的大小 为 32 χη比特(bit ) , η的取值与符号映射方式有关, 即 η与差分调制方式有关。 例如当符号映射方式为八相相移键控 ( 8PSK ) 时, η=3 ; 当符号映射方式为 十六相相移键控 ( 16PSK ) 时, η=4。
LDPC编码单元 S21对子信道中的数据进行 LDPC编码后, 时域交织单元
S22在同一子信道的 LDPC编码块之间根据配置信息指示的交织深度对编码 后的数据进行时域交织。 一种可选的方式是时域交织单元 S22根据所述交织 深度对编码后的数据进行基于比特的卷积交织。
主业务信道复用单元 S23将相同长度的 CU连续排列,在不同长度的 CU之 间插入填充数据, 从而将各子信道时域交织后的数据组成 CIF。
比特传输帧复用单元 S25将主业务信道复用单元 S23获得的 CIF和删余卷 积编码单元 S24获得的卷积编码后的 FIC数据进行比特传输帧复用, 从而将两 路数据合并为一路数据比特流。符号映射单元 S26釆用固定的映射方式( 8PSK 或 16PSK )对 CIF , 也就是 MSC数据, 进行符号映射, 对 FIC数据釆用 QPSK 方式进行符号映射。 然后, 调制单元 S27对 CIF和 FIC数据进行相应的差分调 制获得差分调制符号序列。 其中一种可选的方式是, 调制单元 S27在相邻 OFDM符号的同一个子载波上进行差分调制。
OFDM符号生成单元 S28用于将差分调制符号序列连同相位参考符号和 空符号进行 OFDM调制, 分别生成各自的 OFDM符号。 符号传输帧复用单元 输帧。 在图 2所述的实施例中,为限制子信道中的数据出现连续的 "0"或连续的 "Γ,的长度, 使数据的频谱弥散而保持稳恒, 可以在每个 LDPC编码单元 S21 之前增加一个第一能量扩散单元, 用于对各子信道的数据进行能量扩散。 如 图 3所示, 第一能量扩散单元 S31将数据的比特流按照输入顺序与伪随机序 列进行逐位模二相加后, 即可产生能量扩散后数据。 同理, 也可以在删余卷 积编码单元 S24之前增加一个第二能量扩散单元 S32, 用于对第二组数据进 行能量扩散。 另外, 在符号映射单元 S26和调制单元 S27之间可以增加一个 频域交织单元 S33将映射获得的符号按不同传输模式下 OFDM符号有效子载 波数 K划分成块进行频域交织,然后调制单元 S27对频域交织后的符号进行 差分调制。 这里, 频域交织是符号的块交织, 交织块大小等于有效子载波数 K。
图 4示出了数字广播信号发送方法的一个流程, 该方法包括:
在步骤 41 , 对每个子信道的数据独立地进行前向纠错编码和时域交织。 在步骤 42, 将各子信道时域交织后的数据复用成 MSC数据, 也就是将各 子信道交织后的数据组成 CIF。
在步骤 43 , 对第二组数据进行前向纠错编码获得 FIC数据。
在步骤 44, 釆第一调制方式对 FIC数据进行差分调制, 釆用第二调制方 式对 MSC数据进行差分调制。
其中, 第一调制方式的调制级别低于第二调制方式的调制级别。
在步骤 45, 利用差分调制生成的差分调制符号序列生成信号单元传输帧 并发送所述信号单元传输帧。
其中, 对每个子信道的数据使用的前向纠错编码方法有很多, 一种可选 的方法是釆用 LDPC编码方法对子信道中的数据进行编码。 同样, 对第二组 数据进行前向纠错编码也有很多, 一种可选的方法是釆用卷积编码方法对第 二组数据进行编码。
在系统运行时, 对子信道中的数据进行时域交织的方式包括但不限于下 述两种:
一、 釆用固定的方式对子信道中的数据进行时域交织;
二、 釆用可变的方式对子信道中的数据进行时域交织。 选用第一种方式的情况下, 在对子信道中的数据进行交织时直接按预先 配置好的固定参数对收到的数据进行时域交织即可。 选用第二种方式的情况 下, 在对子信道中的数据进行交织时需要根据配置信息所指示的交织深度对 收到的数据进行时域交织。 第一种方式, 其优点是实现相对简单, 缺点是交 织方式单一缺乏灵活性。 第二种方式, 其优点是交织方式多样比较灵活, 缺 点是实现相对复杂。
进行差分调制时, 对 FIC数据可以釆用 DQPSK方式进行差分调制, 对 MSC数据可以釆用 8DPSK方式进行差分调制, 也可以釆用 16DAPSK方式 进行差分调制, 或者釆用更高阶的方式进行差分调制。
在系统运行时, 对 MSC数据进行差分调制的方式包括但不限于下述两 种:
A、 釆用固定的方式对 MSC数据进行差分调制;
B、 釆用可变的方式对 MSC数据进行差分调制。
选用方式 A的情况下, 在对 MSC数据进行差分调制时直接按预先配置 好的固定方式对 MSC数据进行差份调制即可。 选用方式 B的情况下, 在对 MSC数据进行差分调制时需要根据配置信息所指示的调制方式对 MSC数据 进行差分调制。
获得差分调制符号序列后, 可以将差分调制符号序列连同相位参考符号 和空符号进行 OFDM调制, 分别生成各自的 OFDM符号, 然后将生成的连 续 OFDM符号复用成信号单元传输帧; 或者,将差分调制符号序列连同相位 参考符号进行 OFDM调制, 分别生成各自的 OFDM符号, 然后将生成的连 续 OFDM符号连同空符号复用成信号单元传输帧。
图 5示出了在某一应用场景下数字广播信号发送方法的一种更具体的流 程。 在该应用场景下, 釆用可变的方式对子信道中的数据进行时域交织、 釆 用固定的方式对 MSC数据进行差分调制, 因此需要对釆用的交织深度加以指 示。 在配置信息中需要设置用于定义子信道组织的参数, 所述参数包括但不 限于符号映射方式。
在步骤 51 , 在 FIC对包括配置信息在内的第二组数据进行删余卷积编码 获得 FIC数据。
在步骤 52, 在 MSC独立地对每个子信道的数据进行 LDPC编码和时域交 在每个子信道, 对数据进行 LDPC编码后, 在同一子信道的 LDPC编码块 之间根据配置信息指示的交织深度对编码后的数据进行时域交织。 一种可选 的方式是根据所述交织深度对编码后的数据进行基于比特的卷积交织。
在步骤 53 , 将各子信道交织后的数据组成 CIF。 通过将相同长度的 CU连 续排列,在不同长度的 CU之间插入填充数据, 完成将各子信道时域交织后的 数据组成 CIF。
在步骤 54, 将 CIF和 FIC数据进行比特传输帧复用, 从而将两路数据合并 为一路数据比特流。
在步骤 55, 对 FIC数据釆用 QPSK方式进行符号映射, 对 CIF釆用更高阶 的映射方式(8PSK或 16PSK )进行符号映射。
在步骤 56, 对 CIF和 FIC数据进行相应的差分调制获得差分调制符号序 歹 |J。 其中一种可选的方式是, 在相邻 OFDM符号的同一个子载波上进行差分 调制。
在步骤 57, 将差分调制符号序列连同相位参考符号和空符号进行 OFDM 调制, 分别生成各自的 OFDM符号。
在步骤 58, 将生成的连续 OFDM符号复用成信号单元传输帧并发送。 在图 5所述的实施例中,为限制子信道中的数据出现连续的 "0"或连续的 "1"的长度, 使数据的频谱弥散而保持稳恒, 可以在步骤 52之前增加能量扩 散的步骤, 用于对各子信道的数据进行能量扩散。 同理, 也可以在步骤 51 之前增加能量扩散的步骤, 用于对第二组数据进行能量扩散。
另外, 在步骤 55和步骤 56之间可以增加频域交织的过程, 用于将映射 获得的符号进行频域交织。将映射获得的符号按不同传输模式下 OFDM符号 有效子载波数 K划分成块进行频域交织,再对频域交织后的符号进行差分调 制。 这里, 频域交织是符号的块交织, 交织块大小等于有效子载波数
图 6示出了数字广播信号发送系统的一个结构, 在发送系统 600中, 包 括 N个数字广播信号发送装置 S61和一个频分复用单元 S62,其中 N为大于 1的整数。
数字广播信号发送装置 S61可以釆用上述各实施例中描述的任何一种数 字广播信号发送装置。频分复用单元 S62用于将 N个数字广播信号发送装置 S61生成的 N路信号单元传输帧频分复用成一路基带传输帧发送。
需要指出的是,所述频分复用单元 S62将 N路信号单元传输帧搬移到 N 个频点上, 相邻两个频点的间隔为 1.544MHz。 在某些应用场合下, 例如在 提供 8MHz带宽的场合下, 可以将 5路信号单元传输帧, 即 N=5, 进行频分 复用发送, 从而达到尽可能提高频谱利用率的目的。
在另一个数字广播信号发送方法的实施例中, 可以利用上述各实施例中 描述的数字广播信号发送方法, 生成 N路信号单元传输帧; 然后, 将所述 N 路信号单元传输帧频分复用成一路基带传输帧发送。
一种可选的方式是,将 N路信号单元传输帧搬移到 N个频点上,相邻两 个频点的间隔为 1.544MHz。 在某些应用场合下, 例如在提供 8MHz带宽的 场合下, 可以将 5路信号单元传输帧, 即 N=5, 进行频分复用发送, 从而达 到尽可能提高频谱利用率的目的。
本发明还提供一种集成电路, 用于实现上述任一实施例项所述的方法、 装置或系统。 本发明还提供一种计算机可读介质, 存储有用于实现上述任一 实施例所述方法的程序。
还需要说明的是上述实施例所涉及的方法或装置可以被用于生成基带 信号, 也可以被用于生成非基带信号。 也就是说, 釆用上述实施例生成的基 带信号传输帧, 可以是基带信号, 也可以是非基带信号。
本领域技术人员可以明白, 这里结合所公开的实施例描述的各种示例性 的方法步骤和装置单元均可以电子硬件、 软件或二者的结合来实现。 为了清 楚地示出硬件和软件之间的可交换性, 以上对各种示例性的步骤和单元均以 其功能性的形式进行总体上的描述。 这种功能性是以硬件实现还是以软件实 现依赖于特定的应用和整个系统所实现的设计约束。 本领域技术人员能够针 对每个特定的应用, 以多种方式来实现所描述的功能性, 但是这种实现的结 果不应解释为倒是背离本发明的范围。
利用通用处理器、 数字信号处理器(DSP )、 专用集成电路(ASIC )、 现 场可编程门阵列 (FPGA )或者其它可编程的逻辑器件、 分立门或者晶体管 逻辑、 分立硬件组件或者他们之中的任意组合, 可以实现或执行结合这里公 开的实施例描述的各种示例性的单元。 通用处理器可能是微处理器, 但是在 另一种情况中, 该处理器可能是任何常规的处理器、 控制器、 微控制器或者 状态机。 处理器也可能被实现为计算设备的组合, 例如, DSP和微处理器的 组合、 多个微处理器、一个或者更多结合 DSP核心的微处理器或者任何其他 此种结构。
结合上述公开的实施例所描述的方法的步骤可直接体现为硬件、 由处理 器执行的软件模块或者这二者的组合。 软件模块可能存在于 RAM存储器、 闪存、 ROM存储器、 EPROM存储器、 EEPROM存储器、 寄存器、 硬盘、 移动磁盘、 CD-ROM或者本领域熟知的任何其他形式的存储媒质中。 一种典 型存储媒质与处理器耦合, 从而使得处理器能够从该存储媒质中读信息, 且 可向该存储媒质写信息。 在替换实例中, 存储媒质是处理器的组成部分。 处 理器和存储媒质可能存在于一个 ASIC中。 该 ASIC可能存在于一个用户站 中。 在一个替换实例中, 处理器和存储媒质可以作为用户站中的分立组件存 在。
根据所述公开的实施例, 可以使得本领域技术人员能够实现或者使用本 发明。 对于本领域技术人员来说, 这些实施例的各种修改是显而易见的, 并 且这里定义的总体原理也可以在不脱离本发明的范围和主旨的基础上应用于 其他实施例。 以上所述的实施例仅为本发明的较佳实施例而已, 并不用以限 制本发明, 凡在本发明的精神和原则之内, 所作的任何修改、 等同替换、 改 进等, 均应包含在本发明的保护范围之内。

Claims

权 利 要 求
1、 一种数字广播信号发送装置, 其特征在于, 包括:
至少一个第一编码单元, 每个第一编码单元用于对一个子信道中的数据 进行前向纠错编码;
至少一个时域交织单元, 每个时域交织单元接收一个第一编码单元输出 的编码后的数据, 对编码后的数据进行时域交织;
一个第一复用单元, 用于将各时域交织单元输出的各子信道交织后的数 据复用成主业务信道 MSC数据;
一个第二编码单元, 用于对第二组数据进行前向纠错编码, 获得快速信 息信道 FIC数据;
一个差分调制单元, 用于釆第一调制方式对 FIC数据进行差分调制, 釆 用第二调制方式对 MSC数据进行差分调制; 其中, 第一调制方式的调制级 别低于第二调制方式的调制级别; 和
一个帧生成发送单元, 利用差分调制单元生成的差分调制符号序列生成 信号单元传输帧并发送所述信号单元传输帧。
2、 如权利要求 1 所述的发送装置, 其特征在于, 差分调制单元釆用四 相差分相移键控 DQPSK方式对 FIC数据进行差分调制。
3、 如权利要求 1 所述的发送装置, 其特征在于, 差分调制单元釆用八 相差分相移键控 8DPSK, 或, 十六相差分幅度和相位联合键控 16DAPSK方 式对 MSC数据进行差分调制。
4、 如权利要求 1 所述的发送装置, 其特征在于, 帧生成发送单元将所 述差分调制符号序列连同相位参考符号和空符号进行正交频分复用 OFDM 调制, 分别生成各自的 OFDM符号, 并将生成的连续 OFDM符号复用成信 号单元传输帧。
5、 如权利要求 1 所述的发送装置, 其特征在于, 帧生成发送单元将所 述差分调制符号序列连同相位参考符号进行 OFDM调制, 分别生成各自的 OFDM符号, 并将生成的连续 OFDM符号连同空符号复用成信号单元传输 帧。
6、 如权利要求 1至 5任一项所述的发送装置, 其特征在于, 第二编码单 元对第二组数据进行删余卷积编码。
7、 如权利要求 1至 5任一项所述的发送装置, 其特征在于, 第一编码单 元对每个子信道的数据进行低密度奇偶校验 LDPC编码。
8、 如权利要求 1至 5任一项所述的发送装置, 其特征在于, 还包括多 个第一能量扩散单元, 每个第一能量扩散单元用于对一个子信道的数据进行 能量扩散, 并将结果输出给该子信道的第一编码单元。
9、 如权利要求 1至 5任一项所述的发送装置, 其特征在于, 还包括第 二能量扩散单元, 用于对第二组数据进行能量扩散, 并将结果输出给第二编 码单元。
10、 如权利要求 1至 5任一项所述的发送装置, 其特征在于, 第二组数 据包括配置信息。
11、 一种数字广播信号发送方法, 其特征在于, 包括:
对每个子信道的数据独立地进行前向纠错编码和时域交织;
将各子信道时域交织后的数据复用成主业务信道 MSC数据;
对第二组数据进行前向纠错编码, 获得快速信息信道 FIC数据; 釆第一调制方式对 FIC数据进行差分调制, 釆用第二调制方式对 MSC数 据进行差分调制; 其中, 第一调制方式的调制级别低于第二调制方式的调制 级别;
利用差分调制生成的差分调制符号序列生成信号单元传输帧并发送所 述信号单元传输帧。
12、如权利要求 11所述的发送方法, 其特征在于, 釆用四相差分相移键 控 DQPSK方式对 FIC数据进行差分调制。
13、如权利要求 11所述的发送方法, 其特征在于, 釆用八相差分相移键 控 8DPSK或十六相差分幅度和相位联合键控 16DAPSK方式对 MSC数据进 行差分调制。
14、如权利要求 11所述的发送方法, 其特征在于, 将所述差分调制符号 序列连同相位参考符号和空符号进行正交频分复用 OFDM调制,分别生成各 自的 OFDM符号, 并将生成的连续 OFDM符号复用成信号单元传输帧。
15、如权利要求 11所述的发送方法, 其特征在于, 将所述差分调制符号 序列连同相位参考符号进行 OFDM调制, 分别生成各自的 OFDM符号, 并 将生成的连续 OFDM符号连同空符号复用成信号单元传输帧。
16、 如权利要求 11至 15任一项所述的发送方法, 其特征在于, 对第二组 数据进行删余卷积编码。
17、 如权利要求 11至 15任一项所述的发送方法, 其特征在于, 对每个子 信道的数据进行低密度奇偶校验 LDPC编码。
18、 如权利要求 11至 15任一项所述的发送方法, 其特征在于, 对每个 子信道的数据独立地进行前向纠错编码前还包括: 对每个子信道的数据独立 地进行能量扩散。
19、 如权利要求 11至 15任一项所述的发送方法, 其特征在于, 对第二 组数据信息进行前向纠错编码前还包括: 对第二组数据进行能量扩散。
20、 如权利要求 11至 15任一项所述的发送方法, 其特征在于, 第二组 数据包括配置信息。
21、 一种数字广播信号发送系统, 其特征在于, 包括:
N个如权利要求 1至 10任一项所述的数字广播信号发送装置, 其中 N 为大于 1的整数; 和
一个频分复用单元,用于将 N个数字广播信号发送装置生成的 N路信号 单元传输帧频分复用成一路基带传输帧发送。
22、 如权利要求 21 所述的系统, 其特征在于, 所述频分复用单元将 N 路信号单元传输帧搬移到 N个频点上, 相邻两个频点的间隔为 1.544MHz。
23、 如权利要求 22所述的系统, 其特征在于, N=5。
24、 一种数字广播信号发送方法, 其特征在于, 包括:
利用如权利要求 11至 20任一项所述的数字广播信号发送方法, 生成 N 路信号单元传输帧;
将所述 N路信号单元传输帧频分复用成一路基带传输帧发送。
25、 如权利要求 24所述的方法, 其特征在于, 将 N路信号单元传输帧 搬移到 N个频点上, 相邻两个频点的间隔为 1.544MHz。
26、 如权利要求 25所述的方法, 其特征在于, N=5。
PCT/CN2009/072464 2008-06-27 2009-06-26 数字广播信号的发送装置、发送方法和发送系统 WO2009155875A1 (zh)

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