CN101778075B - Anti-fading transmission method of multimedia broadcasting wireless signal - Google Patents
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Translated fromChinese技术领域technical field
本发明属于无线通信领域，更具体地涉及一种多媒体广播无线信号抗衰落传输方法。The invention belongs to the field of wireless communication, and more specifically relates to an anti-fading transmission method of a multimedia broadcast wireless signal.
背景技术Background technique
目前，无线电视广播已从模拟逐渐向数字化方向发展。数字电视广播无线传输系统，作为数字电视广播无线的重要组成部分，其相关技术的发展，与人们的生活质量息息相关，并因此受到了人们格外的广泛关注。数字电视广播无线相关技术及其相关产业是通信与计算机领域内发展较快，市场前景较好的产业。在数字电视广播无线相关技术上，目前各国关注的重点是，如何为复杂波传环境下的数字电视广播无线提供低成本的可靠高速移动的实现方案。数字电视广播无线传输技术是数字电视广播无线系统的关键技术，对于整个系统性能起着决定性的作用，是大家重点研究的对象。At present, wireless TV broadcasting has gradually developed from analog to digital. Digital TV broadcast wireless transmission system, as an important part of digital TV broadcast wireless, the development of its related technologies is closely related to people's quality of life, and therefore has received extensive attention from people. Digital TV broadcasting wireless related technologies and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of digital TV broadcasting wireless related technologies, the current focus of countries is how to provide low-cost, reliable and high-speed mobile implementation solutions for digital TV broadcasting wireless in a complex wave propagation environment. Digital TV broadcasting wireless transmission technology is the key technology of digital TV broadcasting wireless system, plays a decisive role in the performance of the whole system, and is the object of everyone's key research.
由于数字信号处理技术和集成电路技术的飞速发展，正交频分复用(OFDM)技术的系统实现变得越来越容易。因OFDM多载波传输技术具有结构简单，频谱利用率高，可以抗频率选择性和信道时变等诸多优点而倍受大家的关注并得到深入的研究和在Xdsl、宽带移动通信、宽带无线局域网、数字电视广播等诸多领域中的广泛应用。Due to the rapid development of digital signal processing technology and integrated circuit technology, the system realization of Orthogonal Frequency Division Multiplexing (OFDM) technology becomes easier and easier. Because OFDM multi-carrier transmission technology has many advantages such as simple structure, high spectrum utilization rate, and anti-frequency selectivity and channel time variation, it has attracted much attention and has been deeply researched and applied in Xdsl, broadband mobile communication, broadband wireless local area network, It is widely used in many fields such as digital TV broadcasting.
在实际通信环境中，OFDM通信系统性能受到同步时间、时钟抖动、信道衰落、多用户共信道干扰等因素的影响。抗衰落的信道编码技术和调制方法是实现可靠OFDM通信的关键技术。In the actual communication environment, the performance of OFDM communication system is affected by factors such as synchronization time, clock jitter, channel fading, and multi-user co-channel interference. Anti-fading channel coding technology and modulation method are the key technologies to realize reliable OFDM communication.
信道编码是数字通信系统的重要组成部分。随着现代信息技术的飞速发展，信道编码技术已成为现代通信领域不可或缺的技术。在信息序列中嵌入冗余码元，信道编码技术通过冗余码元的作用减小信号在传输过程中发生错误，从而提高通信系统的可靠性。Channel coding is an important part of digital communication systems. With the rapid development of modern information technology, channel coding technology has become an indispensable technology in the field of modern communication. Redundant code elements are embedded in the information sequence, and channel coding technology reduces signal errors during transmission through the role of redundant code elements, thereby improving the reliability of the communication system.
在多径衰落信道下，可以通过外编码、内编码、交织和调制方案的级联优化设计达到尽可能大的信号分集阶数，以便在等于或超过最小自由距离的符号序列中得到独立衰落。级联不同的编码形式可以充分利用不同编码技术的优点；在编码和码元调制之间插入比特交织器，可以使得编码和调制过程相对独立并将分集阶数从不同的多进制符号数扩大到不同的二进制比特数，从而使得分集阶数得到明显提高并且在多径衰落信道下具有好的误码特性。Under multipath fading channel, the cascaded optimization design of outer coding, inner coding, interleaving and modulation scheme can achieve the largest possible signal diversity order, so as to obtain independent fading in symbol sequences equal to or exceeding the minimum free distance. Cascading different coding forms can make full use of the advantages of different coding techniques; inserting a bit interleaver between coding and symbol modulation can make the coding and modulation processes relatively independent and expand the diversity order from different multi-ary symbols To a different number of binary bits, so that the order of diversity is significantly improved and has good error characteristics in multipath fading channels.
正是基于以上背景，本发明针对实际通信环境提出一种多媒体广播无线信号抗衰落传输方法，可以满足高数据率可控制多业务数字电视广播无线传输的需要。Based on the above background, the present invention proposes an anti-fading transmission method for multimedia broadcasting wireless signals aimed at the actual communication environment, which can meet the needs of high data rate controllable wireless transmission of multi-service digital TV broadcasting.
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发明内容Contents of the invention
本发明针对高数据率可控制多业务数字电视广播无线传输问题，提出了一种多媒体广播无线信号抗衰落传输方法。Aiming at the problem of high data rate controllable multi-service digital TV broadcast wireless transmission, the invention proposes a multimedia broadcast wireless signal anti-fading transmission method.
本发明提出的一种多媒体广播无线信号抗衰落传输方法，其特征在于多媒体广播无线信号在多媒体广播无线发射机端经如下步骤发送至空中无线信道并由接收机端接收处理多媒体广播无线发射机端所发送的信号：An anti-fading transmission method for multimedia broadcasting wireless signals proposed by the present invention is characterized in that the multimedia broadcasting wireless signal is sent to the wireless channel in the air through the following steps at the multimedia broadcasting wireless transmitter end and received and processed by the multimedia broadcasting wireless transmitter end Signal sent:
1)多媒体广播无线发射机端将多媒体数据流经媒体数据处理器转换成数据比特流；1) The multimedia broadcast wireless transmitter end converts the multimedia data stream into a data bit stream through the media data processor;
2)多媒体广播无线发射机端将输入数据比特流经RS编码(Reed-Solomon，RS)、卷积交织、LDPC编码(Low Density Parity Check，LDPC)、码元调制、星座旋转、码元交织后进一步在频域上形成FFT级联交织编码调制数据块(FFT级联交织编码调制数据块的长度(符号个数)为K)；2) The multimedia broadcast wireless transmitter side passes the input data bit stream through RS coding (Reed-Solomon, RS), convolutional interleaving, LDPC coding (Low Density Parity Check, LDPC), symbol modulation, constellation rotation, and symbol interleaving Further form FFT concatenated interleaved coded modulation data block (the length (number of symbols) of FFT concatenated interleaved coded modulated data block is K) on the frequency domain;
3)多媒体广播无线发射机端采用IFFT(快速离散傅立叶反变换)将FFT级联交织编码调制数据块变换为时域的离散级联交织编码调制数据样值块；3) The multimedia broadcast wireless transmitter uses IFFT (Inverse Fast Discrete Fourier Transform) to convert the FFT concatenated interleaved coded modulation data block into a time domain discrete concatenated interleaved coded modulated data sample block;
4)多媒体广播无线发射机端将循环前缀(循环前缀的长度为C)作为保护间隔插入到时域的离散级联交织编码调制数据样值块，形成时域循环前缀离散级联交织编码调制数据样值块(时域循环前缀离散级联交织编码调制数据样值块的长度为(K+C))；4) The multimedia broadcast wireless transmitter end inserts the cyclic prefix (the length of the cyclic prefix is C) into the discrete concatenated interleaved coded modulation data sample block in the time domain as a guard interval to form the time domain cyclic prefix discrete concatenated interleaved coded modulated data Sample block (the length of the time-domain cyclic prefix discrete concatenated interleaved coded modulation data sample block is (K+C));
5)多媒体广播无线发射机端将连续的4个时域循环前缀离散级联交织编码调制数据样值块形成帧体(帧体的长度为L，L＝4×(K+C))；5) The multimedia broadcast wireless transmitter end forms a frame body (the length of the frame body is L, L=4×(K+C)) with four continuous time-domain cyclic prefix discrete concatenated interleaved coded modulation data sample blocks;
6)多媒体广播无线发射机端将训练序列作为复数训练序列的实部序列、将业务指标序列作为复数训练序列的虚部序列，在时域上构成复数训练序列的离散样值块(训练序列、业务指标序列、复数训练序列的离散样值块的长度都为X)；6) The multimedia broadcast wireless transmitter side uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence as the imaginary part sequence of the complex training sequence to form discrete sample blocks of the complex training sequence (training sequence, The length of the discrete sample value block of the business index sequence and the complex training sequence is X);
7)多媒体广播无线发射机端将时域上构成的复数训练序列的离散样值块(作为帧头)插入到帧体，以形成信号帧；7) The multimedia broadcast wireless transmitter end inserts the discrete sample blocks (as frame headers) of the complex training sequence formed in the time domain into the frame body to form a signal frame;
8)多媒体广播无线发射机端采用平方根升余弦滚降滤波器对信号帧的信号脉冲成形；8) The multimedia broadcast wireless transmitter uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;
9)多媒体广播无线发射机端将基带信号上变频至载波上形成射频信号发射到空中无线信道；9) The multimedia broadcast wireless transmitter end converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air;
10)接收机端接收处理多媒体广播无线发射机端所发送的信号。10) The receiver receives and processes the signal sent by the multimedia broadcast wireless transmitter.
按照上述的多媒体广播无线信号抗衰落传输方法，其特征在于：多媒体广播无线发射机端将多媒体数据流经媒体数据处理器转换成数据比特流；多媒体广播无线发射机端对输入数据比特流进行RS编码(Reed-Solomon，RS)、卷积交织、LDPC编码(Low Density Parity Check，LDPC)、码元调制、星座旋转、码元交织后进一步在频域上形成FFT级联交织编码调制数据块，RS编码与卷积交织结合在一起具有很强的抗突发错误能力，其中，LDPC编码的编码率为1/4、1/2、5/8、3/4和7/8中的一个，码元调制为QPSK、16QAM、64QAM、和256QAM中的一种，码元星座图映射方式采用格雷码映射，QPSK码元星座的星座旋转角度为22.5度，16QAM码元星座的星座旋转角度为11.25度，64QAM码元星座的星座旋转角度为5.626度，256QAM码元星座的星座旋转角度为2.8125度，码元交织采用随机交织方式；多媒体广播无线发射机端的信号帧中具有周期性的时域训练序列离散样值块；多媒体广播无线发射机端的训练序列的长度(符号个数)X为512；多媒体广播无线发射机端的FFT级联交织编码调制数据块的长度(符号个数)K(子载波数)取2048、4096、8192中的一个，相对应的子载波的频率间隔分别为4KHz、2KHz、1KHz，相对应的循环前缀长度C分别为FFT级联交织编码调制数据块长度K大小的1/4、1/8、1/16；多媒体广播无线发射机端的训练序列、业务指标序列由一系列的1或-1组成，具有伪随机特性；多媒体广播无线发射机端的训练序列、业务指标序列相互之间具有正交性；多媒体广播无线发射机端的各个不同的业务指标序列包含着并且唯一表达着多媒体广播无线发射机的各系统参数和业务模式信息；接收机端接收处理无线多媒体广播发射机端所发送的信号。According to the above-mentioned multimedia broadcast wireless signal anti-fading transmission method, it is characterized in that: the multimedia broadcast wireless transmitter end converts the multimedia data stream into a data bit stream through a media data processor; the multimedia broadcast wireless transmitter end performs RS on the input data bit stream Coding (Reed-Solomon, RS), convolutional interleaving, LDPC coding (Low Density Parity Check, LDPC), symbol modulation, constellation rotation, and symbol interleaving to further form FFT concatenated interleaving code modulation data blocks in the frequency domain, The combination of RS coding and convolutional interleaving has a strong ability to resist burst errors. Among them, the coding rate of LDPC coding is one of 1/4, 1/2, 5/8, 3/4 and 7/8. The symbol modulation is one of QPSK, 16QAM, 64QAM, and 256QAM. The symbol constellation map mapping method adopts Gray code mapping. The constellation rotation angle of the QPSK symbol constellation is 22.5 degrees, and the constellation rotation angle of the 16QAM symbol constellation is 11.25 degrees. degree, the constellation rotation angle of the 64QAM symbol constellation is 5.626 degrees, and the constellation rotation angle of the 256QAM symbol constellation is 2.8125 degrees, and the symbol interleaving adopts the random interleaving method; the signal frame of the multimedia broadcast wireless transmitter has periodic time domain training Sequence discrete sample value block; the length (number of symbols) X of the training sequence of the multimedia broadcasting wireless transmitter end is 512; number) take one of 2048, 4096, 8192, the frequency intervals of the corresponding subcarriers are 4KHz, 2KHz, 1KHz respectively, and the corresponding cyclic prefix length C is 1 of the length K of the FFT concatenated interleaving coding modulation data block /4, 1/8, 1/16; the training sequence and service index sequence of the multimedia broadcast wireless transmitter end are composed of a series of 1 or -1, which have pseudo-random characteristics; the training sequence and service index sequence of the multimedia broadcast wireless transmitter end They are orthogonal to each other; each different service index sequence at the multimedia broadcast wireless transmitter end contains and uniquely expresses the system parameters and business mode information of the multimedia broadcast wireless transmitter; the receiver end receives and processes the wireless multimedia broadcast transmitter signal sent by the terminal.
本发明的特点：Features of the present invention:
本发明是一种时域频域混合的抗衰落信号分集传输方案。多媒体广播无线发射机端的信号帧中具有周期性的时域训练序列离散样值块，多媒体广播无线发射机端的训练序列、业务指标序列具有伪随机特性，多媒体广播无线发射机端的训练序列、业务指标序列相互之间具有正交性，多媒体广播无线发射机端将时域上构成的复数训练序列的离散样值块(作为帧头)插入到帧体而形成信号帧，这些保证了多媒体广播无线接收机端可以实现快速准确的帧同步、频率同步、时间同步、信道传输特性估计、以及对相位噪声和信道传输特性进行可靠跟踪。多媒体广播无线发射机端将循环前缀作为保护间隔插入到时域的离散级联交织编码调制数据样值块形成时域循环前缀离散级联交织编码调制数据样值块，可以减少相邻信号数据样值块之间的干扰影响。多媒体广播无线发射机端采用外编码、交织、内编码、调制、星座旋转、交织方案的级联优化设计对输入数据进行级联交织编码调制提高了信号分集阶数和抗干扰噪声纠错能力，使得通信系统在多径衰落信道下具有好的误码特性，使得通信系统对传输环境背景具有抗衰落性。多媒体广播无线发射机端将连续的4个时域循环前缀离散级联交织编码调制数据样值块形成帧体可以提多媒体广播系统的效率。多媒体广播无线发射机端的码元调制与星座旋转提供了信号分集效果。多媒体广播无线发射机端的各个不同的业务指标序列包含着并且唯一表达着多媒体广播无线发射机的各系统参数和业务模式信息，可以使得多媒体广播无线传输系统能够提供无偿电视广播、有偿电视广播、保密信息传输、多媒体增值服务等可控制多业务，满足社会需求。本发明的多媒体广播无线信号抗衰落传输方法具有接收同步时间短、时钟抖动小、抗信道衰落、抗信道干扰、可以提供高数据率可控制多业务数字电视广播无线传输并对传输环境背景具有抗衰落性等诸多优点。The invention is a time-domain frequency-domain mixed anti-fading signal diversity transmission scheme. There are periodic time-domain training sequence discrete sample blocks in the signal frame of the multimedia broadcast wireless transmitter end, the training sequence and service index sequence of the multimedia broadcast wireless transmitter end have pseudo-random characteristics, and the training sequence and service index sequence of the multimedia broadcast wireless transmitter end The sequences are orthogonal to each other. The multimedia broadcast wireless transmitter inserts the discrete sample blocks (as the frame header) of the complex training sequence formed in the time domain into the frame body to form a signal frame, which ensures the multimedia broadcast wireless reception. The machine end can realize fast and accurate frame synchronization, frequency synchronization, time synchronization, channel transmission characteristic estimation, and reliable tracking of phase noise and channel transmission characteristics. The multimedia broadcast wireless transmitter inserts the cyclic prefix as a guard interval into the discrete concatenated interleaved coded modulation data sample block in the time domain to form a time domain cyclic prefix discrete concatenated interleaved coded modulated data sample block, which can reduce adjacent signal data samples Interference influence between value blocks. The multi-media broadcast wireless transmitter adopts the cascade optimization design of outer coding, interleaving, inner coding, modulation, constellation rotation, and interleaving schemes to perform cascading interleaving coding and modulation on the input data, which improves the signal diversity order and anti-jamming noise error correction ability. The communication system has good bit error characteristics under the multipath fading channel, and the communication system has fading resistance to the transmission environment background. The efficiency of the multimedia broadcasting system can be improved by forming a frame body of four consecutive time-domain cyclic prefix discrete concatenated interleaved coded and modulated data sample blocks at the multimedia broadcasting wireless transmitter side. The symbol modulation and constellation rotation at the wireless transmitter end of multimedia broadcasting provide signal diversity effect. The various service index sequences at the multimedia broadcasting wireless transmitter end contain and uniquely express the various system parameters and business mode information of the multimedia broadcasting wireless transmitter, which can enable the multimedia broadcasting wireless transmission system to provide free TV broadcasting, paid TV broadcasting, confidentiality Information transmission, multimedia value-added services, etc. can control multiple services to meet social needs. The multimedia broadcast wireless signal anti-fading transmission method of the present invention has the advantages of short receiving synchronization time, small clock jitter, anti-channel fading, anti-channel interference, can provide high data rate, can control multi-service digital TV broadcast wireless transmission, and has anti-transmission environment background Fading and many other advantages.
附图说明Description of drawings
图1是按照本发明的多媒体广播无线信号抗衰落传输方法的某个发射机和接收机间信号传输的实施例示意图。FIG. 1 is a schematic diagram of an embodiment of signal transmission between a certain transmitter and a receiver in a method for anti-fading transmission of multimedia broadcast wireless signals according to the present invention.
图2是按照本发明的多媒体广播无线信号抗衰落传输方法的某个发射机和接收机间信号传输过程中信号帧形成的实施例示意图。Fig. 2 is a schematic diagram of an embodiment of signal frame formation during signal transmission between a certain transmitter and a receiver in the anti-fading transmission method of multimedia broadcast wireless signals according to the present invention.
图3是按照本发明的多媒体广播无线信号抗衰落传输方法的某个多媒体广播无线发射机端的QPSK码元调制、16QAM码元调制的星座旋转方法的实施例示意图。Fig. 3 is a schematic diagram of an embodiment of a constellation rotation method of QPSK symbol modulation and 16QAM symbol modulation at a certain multimedia broadcast wireless transmitter end according to the multimedia broadcast wireless signal anti-fading transmission method of the present invention.
具体实施方式Detailed ways
下面将结合附图对本发明的具体实施例进行详细描述。Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
按照本发明提出的多媒体广播无线信号抗衰落传输方法的某个发射机和接收机间信号传输的实施例，如图1所示，多媒体广播无线信号在多媒体广播无线发射机端经如下步骤发送至空中无线信道并由接收机端接收处理多媒体广播无线发射机端所发送的信号：According to an embodiment of signal transmission between a certain transmitter and a receiver of the multimedia broadcast wireless signal anti-fading transmission method proposed in the present invention, as shown in Figure 1, the multimedia broadcast wireless signal is sent to the multimedia broadcast wireless transmitter through the following steps The air wireless channel is used by the receiver to receive and process the signal sent by the wireless transmitter of multimedia broadcasting:
1)该某个多媒体广播无线发射机端将多媒体数据流经媒体数据处理器转换成数据比特流；1) The certain multimedia broadcast wireless transmitter end converts the multimedia data stream into a data bit stream through a media data processor;
2)该某个多媒体广播无线发射机端将输入数据比特流经RS编码(Reed-Solomon，RS)、卷积交织(多媒体广播无线发射机端的RS编码与卷积交织结合在一起具有很强的抗突发错误能力)、LDPC编码(Low Density ParityCheck，LDPC)(多媒体广播无线发射机端的数据比特流经RS编码(Reed-Solomon，RS)、卷积交织后的LDPC编码的编码率为1/4、1/2、5/8、3/4和7/8中的一个)、码元调制(多媒体广播无线发射机端的数据比特流经RS编码(Reed-Solomon，RS)、卷积交织、LDPC编码后的码元调制为QPSK、16QAM、64QAM、和256QAM中的一种，码元星座图映射方式采用格雷码映射)、星座旋转(QPSK码元星座的星座旋转角度为22.5度，16QAM码元星座的星座旋转角度为11.25度，64QAM码元星座的星座旋转角度为5.626度，256QAM码元星座的星座旋转角度为2.8125度)、码元交织(码元交织采用随机交织方式)后进一步在频域上形成FFT级联交织编码调制数据块(FFT级联交织编码调制数据块的长度(符号个数)为K；FFT级联交织编码调制数据块的长度(符号个数)K(子载波数)取2048、4096、8192中的一个；当FFT级联交织编码调制数据块的长度K(子载波数)取2048，相对应的子载波的频率间隔取4KHz；当FFT级联交织编码调制数据块的长度K(子载波数)取4096，相对应的子载波的频率间隔取2KHz；当FFT级联交织编码调制数据块的长度K(子载波数)取8192，相对应的子载波的频率间隔取1KHz)；2) The certain multimedia broadcasting wireless transmitter end passes the input data bit stream through RS encoding (Reed-Solomon, RS), convolutional interleaving (RS encoding and convolutional interleaving at the multimedia broadcasting wireless transmitter end combine together to have a strong Anti-burst error capability), LDPC encoding (Low Density ParityCheck, LDPC) (the data bit stream of the multimedia broadcasting wireless transmitter end is encoded by RS (Reed-Solomon, RS), and the encoding rate of the LDPC encoding after convolutional interleaving is 1/ 4, 1/2, 5/8, 3/4, and 7/8), symbol modulation (the data bit stream at the multimedia broadcast wireless transmitter end is encoded by RS (Reed-Solomon, RS), convolutional interleaving, The symbol modulation after LDPC encoding is one of QPSK, 16QAM, 64QAM, and 256QAM. The constellation rotation angle of the element constellation is 11.25 degrees, the constellation rotation angle of the 64QAM code element constellation is 5.626 degrees, and the constellation rotation angle of the 256QAM code element constellation is 2.8125 degrees), after the code element interleaving (the code element interleaving adopts random interleaving mode), further in Form the FFT concatenated interleaved coded modulation data block on the frequency domain (the length (symbol number) of the FFT concatenated interleaved coded modulated data block is K; the length (symbol number) of the FFT concatenated interleaved coded modulated data block K (subcarrier Number) is one of 2048, 4096, 8192; when the length K (number of subcarriers) of the FFT concatenated interleaving coding modulation data block is 2048, the frequency interval of the corresponding subcarriers is 4KHz; when the FFT cascading interleaving coding modulation The length K (number of subcarriers) of the data block is 4096, and the frequency interval of the corresponding subcarriers is 2KHz; The frequency interval is 1KHz);
3)该某个多媒体广播无线发射机端采用IFFT(快速离散傅立叶反变换)将FFT级联交织编码调制数据块变换为时域的离散级联交织编码调制数据样值块；3) The certain multimedia broadcast wireless transmitter adopts IFFT (Inverse Fast Discrete Fourier Transform) to transform the FFT concatenated interleaved coded modulation data block into a time domain discrete concatenated interleaved coded modulated data sample block;
4)该某个多媒体广播无线发射机端将循环前缀(循环前缀的长度为C；当FFT级联交织编码调制数据块的长度K(子载波数)取2048，相对应的循环前缀长度C为FFT级联交织编码调制数据块长度K大小的1/4；当FFT级联交织编码调制数据块的长度K(子载波数)取4096，相对应的循环前缀长度C为FFT级联交织编码调制数据块长度K大小的1/8；当FFT级联交织编码调制数据块的长度K(子载波数)取8192，相对应的循环前缀长度C为FFT级联交织编码调制数据块长度K大小的1/16)作为保护间隔插入到时域的离散级联交织编码调制数据样值块，形成时域循环前缀离散级联交织编码调制数据样值块(时域循环前缀离散级联交织编码调制数据样值块的长度为(K+C))；4) The certain multimedia broadcasting wireless transmitter end uses the cyclic prefix (the length of the cyclic prefix is C; when the length K (number of subcarriers) of the FFT concatenated interleaving coding modulation data block is 2048, the corresponding cyclic prefix length C is FFT concatenated interleaving encoding modulation data block length K is 1/4 of the size; when the length K (subcarrier number) of FFT concatenating interleaving encoding modulation data block is 4096, the corresponding cyclic prefix length C is FFT concatenating interleaving encoding modulation 1/8 of the size of the data block length K; when the length K (number of subcarriers) of the FFT concatenated interleaved coded modulation data block is 8192, the corresponding cyclic prefix length C is the size of the FFT concatenated interleaved coded modulated data block length K 1/16) Insert the discrete concatenated interleaved coded modulation data sample block in the time domain as a guard interval to form a time domain cyclic prefix discrete concatenated interleaved coded modulated data sample block (time domain cyclic prefix discrete concatenated interleaved coded modulated data block The length of the sample block is (K+C));
5)该某个多媒体广播无线发射机端将连续的4个时域循环前缀离散级联交织编码调制数据样值块形成帧体(帧体的长度为L，L＝4×(K+C))；5) The certain multimedia broadcast wireless transmitter end forms a frame body with four continuous time-domain cyclic prefix discrete concatenated interleaving coded modulation data sample blocks (the length of the frame body is L, L=4*(K+C) );
6)该某个多媒体广播无线发射机端将训练序列作为复数训练序列的实部序列、将业务指标序列作为复数训练序列的虚部序列，在时域上构成复数训练序列的离散样值块(训练序列、业务指标序列、复数训练序列的离散样值块的长度都为X；训练序列的长度(符号个数)X取512)；6) The certain multimedia broadcast wireless transmitter end uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence as the imaginary part sequence of the complex training sequence, and forms discrete sample value blocks of the complex training sequence in the time domain ( The length of the discrete sample blocks of the training sequence, the service index sequence, and the complex training sequence is all X; the length (number of symbols) X of the training sequence is 512);
7)多媒体广播无线发射机端将时域上构成的复数训练序列的离散样值块(作为帧头)插入到帧体，以形成信号帧；7) The multimedia broadcast wireless transmitter end inserts the discrete sample blocks (as frame headers) of the complex training sequence formed in the time domain into the frame body to form a signal frame;
8)该某个多媒体广播无线发射机端采用平方根升余弦滚降滤波器对信号帧的信号脉冲成形；8) The certain multimedia broadcast wireless transmitter adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;
9)该某个多媒体广播无线发射机端将基带信号上变频至载波上形成射频信号发射到空中无线信道；9) The certain multimedia broadcast wireless transmitter end converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air;
10)该某个接收机端接收处理多媒体广播无线发射机端所发送的信号。10) The certain receiver receives and processes the signal sent by the multimedia broadcast wireless transmitter.
按照本发明的多媒体广播无线信号抗衰落传输方法的某个发射机和接收机间信号传输过程中信号帧形成的实施例，如图2所示，具体实施如下：According to the embodiment of signal frame formation in the signal transmission process between a certain transmitter and receiver of the multimedia broadcast wireless signal anti-fading transmission method of the present invention, as shown in Figure 2, the specific implementation is as follows:
该某个多媒体广播无线发射机端将多媒体数据流经媒体数据处理器转换成数据比特流。The certain multimedia broadcast wireless transmitter converts the multimedia data stream into a data bit stream through a media data processor.
该某个多媒体广播无线发射机端将输入数据比特流经RS编码(Reed-Solomon，RS)、卷积交织、LDPC编码(Low Density Parity Check，LDPC)、码元调制、星座旋转、码元交织后进一步在频域上形成FFT级联交织编码调制数据块，再经IFFT将其变换为时域的离散级联交织编码调制数据样值块。The certain multimedia broadcast wireless transmitter end passes the input data bit stream through RS encoding (Reed-Solomon, RS), convolutional interleaving, LDPC encoding (Low Density Parity Check, LDPC), symbol modulation, constellation rotation, and symbol interleaving Afterwards, FFT concatenated interleaved coded modulation data blocks are further formed in the frequency domain, and then transformed into discrete concatenated interleaved coded modulated data sample blocks in the time domain by IFFT.
FFT级联交织编码调制数据块由子载波组成。FFT级联交织编码调制数据块的长度(符号个数)为K；K(子载波数)取2048、4096、8192中的一个；当FFT级联交织编码调制数据块的长度K(子载波数)取2048，相对应的子载波的频率间隔取4KHz；当FFT级联交织编码调制数据块的长度K(子载波数)取4096，相对应的子载波的频率间隔取2KHz；当FFT级联交织编码调制数据块的长度K(子载波数)取8192，相对应的子载波的频率间隔取1KHz。The FFT cascaded interleaved coded modulation data block consists of subcarriers. The length (the number of symbols) of the FFT concatenated interleaved coding modulation data block is K; K (the number of subcarriers) is one of 2048, 4096, 8192; ) is 2048, and the frequency interval of the corresponding subcarriers is 4KHz; when the length K (number of subcarriers) of the FFT concatenated interleaving coding modulation data block is 4096, the frequency interval of the corresponding subcarriers is 2KHz; when the FFT concatenation The length K (the number of sub-carriers) of the interleaved coded modulation data block is 8192, and the frequency interval of the corresponding sub-carriers is 1 KHz.
该某个多媒体广播无线发射机端将循环前缀作为保护间隔插入到时域的离散级联交织编码调制数据样值块，形成时域循环前缀离散级联交织编码调制数据样值块。The certain multimedia broadcast wireless transmitter end inserts the cyclic prefix as a guard interval into the discrete concatenated interleaved coded modulation data sample block in the time domain to form a time domain cyclic prefix discrete concatenated interleaved coded modulated data sample block.
作为保护间隔的循环前缀的长度为C；当FFT级联交织编码调制数据块的长度K(子载波数)取2048，相对应的循环前缀长度C为FFT级联交织编码调制数据块长度K大小的1/4；当FFT级联交织编码调制数据块的长度K(子载波数)取4096，相对应的循环前缀长度C为FFT级联交织编码调制数据块长度K大小的1/8；当FFT级联交织编码调制数据块的长度K(子载波数)取8192，相对应的循环前缀长度C为FFT级联交织编码调制数据块长度K大小的1/16。The length of the cyclic prefix used as the guard interval is C; when the length K (number of subcarriers) of the FFT concatenated interleaved coded modulation data block is 2048, the corresponding cyclic prefix length C is the length K of the FFT concatenated interleaved coded modulated data block 1/4; when the length K (number of subcarriers) of the FFT concatenated interleaved coded modulation data block is 4096, the corresponding cyclic prefix length C is 1/8 of the length K of the FFT concatenated interleaved coded modulated data block; when The length K (the number of subcarriers) of the FFT concatenated interleaved coded modulation data block is 8192, and the corresponding cyclic prefix length C is 1/16 of the length K of the FFT concatenated interleaved coded modulated data block.
该某个多媒体广播无线发射机端将连续的4个时域循环前缀离散级联交织编码调制数据样值块形成帧体。The wireless transmitter of multimedia broadcasting forms a frame body with four consecutive time-domain cyclic prefix discrete concatenated interleaved coded and modulated data sample blocks.
该某个多媒体广播无线发射机端将训练序列作为复数训练序列的实部序列、将业务指标序列作为复数训练序列的虚部序列，在时域上构成复数训练序列的离散样值块。The certain multimedia broadcast wireless transmitter uses the training sequence as the real part sequence of the complex training sequence and the service index sequence as the imaginary part sequence of the complex training sequence to form discrete sample blocks of the complex training sequence in the time domain.
训练序列、业务指标序列、复数训练序列的离散样值块的长度都为X，X取512。The lengths of the discrete sample blocks of the training sequence, the service index sequence, and the complex training sequence are all X, and X is 512.
作为多媒体广播无线发射机端的训练序列、业务指标序列由一系列的1或-1组成，具有伪随机特性，训练序列、业务指标序列相互之间具有正交性。满足上述特征的训练序列可由作为伪随机数序列的一种特殊类型的一组移位m序列和作为正交序列的沃尔什序列、哈达玛序列或由其他方式产生的正交序列实现。As the training sequence and service index sequence of the wireless transmitter of multimedia broadcasting, it is composed of a series of 1 or -1, which has pseudo-random characteristics, and the training sequence and service index sequence are orthogonal to each other. The training sequence satisfying the above characteristics can be realized by a special type of shifted m-sequence as a pseudo-random number sequence and Walsh sequence, Hadamard sequence or orthogonal sequence generated by other methods as an orthogonal sequence.
各个不同的业务指标序列包含着并且唯一表达着多媒体广播无线发射机端的各系统参数和业务模式信息。Each different service index sequence contains and uniquely expresses various system parameters and service mode information of the multimedia broadcast wireless transmitter.
该某个多媒体广播无线发射机端将时域上构成的复数训练序列的离散样值块(作为帧头)插入到帧体，以形成信号帧。The certain multimedia broadcast wireless transmitter end inserts discrete sample blocks (as frame headers) of the complex training sequence formed in the time domain into the frame body to form a signal frame.
该某个多媒体广播无线发射机端采用平方根升余弦滚降滤波器对信号帧的信号进行脉冲成形。当K取2048时，相对应的对信号帧的信号进行脉冲成形的平方根升余弦滚降滤波器的滚降系数取0.1；当K取4096时，相对应的对信号帧的信号进行脉冲成形的平方根升余弦滚降滤波器的滚降系数取0.05；当K取8192时，相对应的对信号帧的信号进行脉冲成形的平方根升余弦滚降滤波器的滚降系数取0.025。The certain multimedia broadcasting wireless transmitter uses a square root raised cosine roll-off filter to perform pulse shaping on the signal of the signal frame. When K is 2048, the roll-off coefficient of the square root raised cosine roll-off filter corresponding to the pulse shaping of the signal frame is 0.1; when K is 4096, the corresponding pulse shaping of the signal frame is The roll-off coefficient of the square root raised cosine roll-off filter is 0.05; when K is 8192, the corresponding roll-off coefficient of the square root raised cosine roll-off filter for pulse shaping the signal frame is 0.025.
该某个多媒体广播无线发射机端将基带信号上变频至载波上形成射频信号发射到空中无线信道。The certain multimedia broadcasting wireless transmitter end converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air.
该某个接收机端接收处理多媒体广播无线发射机端所发送的信号。The certain receiver receives and processes the signal sent by the multimedia broadcast wireless transmitter.
按照本发明提出的多媒体广播无线信号抗衰落传输方法的某个多媒体广播无线发射机端的QPSK码元调制、16QAM码元调制的星座旋转方法的实施例，如图3所示，该某个多媒体广播无线发射机端的QPSK码元调制、16QAM码元调制的码元星座图映射方式采用格雷码映射；QPSK码元星座的星座旋转角度为22.5度，16QAM码元星座的星座旋转角度为11.25度。According to the embodiment of the constellation rotation method of QPSK symbol modulation and 16QAM symbol modulation of a certain multimedia broadcast wireless transmitter end of the multimedia broadcast wireless signal anti-fading transmission method proposed in the present invention, as shown in Figure 3, the certain multimedia broadcast The symbol constellation mapping method of QPSK symbol modulation and 16QAM symbol modulation at the wireless transmitter end adopts Gray code mapping; the constellation rotation angle of QPSK symbol constellation is 22.5 degrees, and the constellation rotation angle of 16QAM symbol constellation is 11.25 degrees.
上面结合附图对本发明的具体实施例进行了详细说明，但本发明并不局限于上述实施例，在不脱离本申请的权利要求的精神和范围情况下，本领域的技术人员可作出各种修改或改型。The specific embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and those skilled in the art can make various modifications without departing from the spirit and scope of the claims of the application modify or remodel.
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