CN102263756A - A Noise Resistant Mobile Digital Broadcasting Signal Transmission Method - Google Patents

Abstract

Translated fromChinese

本发明公开了一种抗噪声移动数字广播信号传输方法，是一种时域频域混合的传输方案。本发明的抗噪声移动数字广播信号传输方法，具有低峰均功率比、同步时间短、抗噪声影响、可控多业务等优点。

The invention discloses an anti-noise mobile digital broadcasting signal transmission method, which is a time-domain and frequency-domain mixed transmission scheme. The anti-noise mobile digital broadcast signal transmission method of the invention has the advantages of low peak-to-average power ratio, short synchronization time, anti-noise effect, controllable multi-service and the like.

Description

Translated fromChinese

一种抗噪声移动数字广播信号传输方法A Noise Resistant Mobile Digital Broadcasting Signal Transmission Method

技术领域technical field

本发明属于移动通信领域，更具体地涉及一种抗噪声移动数字广播信号传输方法。The invention belongs to the field of mobile communication, and more specifically relates to an anti-noise mobile digital broadcasting signal transmission method.

背景技术Background technique

目前，电视广播已从模拟逐渐向数字化方向发展。数字电视移动数字广播传输系统，作为数字电视移动数字广播的重要组成部分，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。数字电视移动数字广播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。在数字电视抗噪声移动数字广播相关技术上，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抗噪声移动数字广播提供低成本的可靠高速移动的实现方案。抗噪声移动数字广播信号发射机传输技术是数字电视抗噪声移动数字广播系统的关键技术，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, television broadcasting has gradually developed from analog to digital. Digital TV mobile digital broadcasting transmission system, as an important part of digital TV mobile digital broadcasting, 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, mobile digital broadcasting related technologies and related industries are industries with rapid development and good market prospects in the field of communication and computer. In terms of technologies related to digital TV anti-noise mobile digital broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile implementation solutions for digital TV anti-noise mobile digital broadcasting in a complex wave propagation environment. The anti-noise mobile digital broadcast signal transmitter transmission technology is the key technology of the digital TV anti-noise mobile digital broadcast system, which 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、宽带移动局域网、数字电视抗噪声移动数字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 resistance to frequency selectivity and channel time variation, it has attracted much attention and has been deeply researched and applied in Xdsl, broadband mobile communication, broadband mobile local area network, It is widely used in many fields such as digital TV anti-noise, mobile digital broadcasting, etc.

OFDM信号较高的峰均功率比(PAPR)对放大器和数模转换器的线性范围有很高的要求，如果系统的线性范围不能满足信号的变化，则会造成信号畸变，使信号频谱发生变化，从而导致子信道之间的正交性遭到破坏，产生相互干扰，使系统性能恶化。因此，必须要考虑如何减小OFDM信号中大峰值功率信号的出现概率并降低非线性失真影响的解决方案。The high peak-to-average power ratio (PAPR) of OFDM signals has high requirements on the linear range of amplifiers and digital-to-analog converters. If the linear range of the system cannot meet the signal changes, it will cause signal distortion and signal spectrum changes. , resulting in the destruction of the orthogonality between sub-channels, resulting in mutual interference and deteriorating system performance. Therefore, it is necessary to consider how to reduce the occurrence probability of high peak power signals in OFDM signals and reduce the impact of nonlinear distortion.

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。低密度奇偶校验(Low Density Parity Check，LDPC)码是一种用于在噪声传输信道中传输信息并执行前向纠错(FEC，Forward Error Correction)的纠错码。LDPC编码是一种能使数据传输速率接近理论最大值，即香农极限的编码方案。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. Low Density Parity Check (Low Density Parity Check, LDPC) code is an error correction code used to transmit information in a noisy transmission channel and perform forward error correction (FEC, Forward Error Correction). LDPC coding is a coding scheme that can make the data transmission rate close to the theoretical maximum, which is the Shannon limit.

在实际通信环境中，数字电视移动数字广播通信系统性能受到同步时间、时钟抖动、信道衰落、信道干扰等因素的影响。抗噪声移动数字广播信号发射机传输方法是实现可靠数字电视抗噪声移动数字广播的关键技术。In the actual communication environment, the performance of the digital TV mobile digital broadcasting communication system is affected by factors such as synchronization time, clock jitter, channel fading, and channel interference. The transmission method of anti-noise mobile digital broadcasting signal transmitter is the key technology to realize reliable digital television anti-noise mobile digital broadcasting.

利用数字电视移动数字广播传输系统提供无偿电视广播、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是新一代数字电视移动数字广播传输系统满足社会需求的体现。Using the digital TV mobile digital broadcast transmission system to provide controllable multi-services such as free TV broadcast, paid TV broadcast, confidential information transmission, and multimedia value-added services is the embodiment of the new generation of digital TV mobile digital broadcast transmission system to meet social needs.

正是基于以上背景，本发明针对实际通信环境提出一种抗噪声移动数字广播信号传输方法，可以满足高数据率可控制多业务数字电视抗噪声移动数字广播传输的需要。Based on the above background, the present invention proposes an anti-noise mobile digital broadcast signal transmission method for the actual communication environment, which can meet the needs of high data rate controllable multi-service digital TV anti-noise mobile digital broadcast transmission.

欲对专利背景作更深入的了解可参考以下文献资料：For a more in-depth understanding of the patent background, please refer to the following literature:

R.V.Nee，R.Prasad.“OFDM for wireless multimedia communications””.Boston：Artech House，2000.R.V.Nee, R.Prasad. "OFDM for wireless multimedia communications". Boston: Artech House, 2000.

Y.Wu，S.Hirakawa，U.H.Reimers，and J.Whitaker.“Overview of digitaltelevision development，”Proceedings of the IEEE，Special Issue on GlobalDigital Television：Technology and Emerging Services，pp.8-21，Jan.2006.Y. Wu, S. Hirakawa, U.H. Reimers, and J. Whitaker. "Overview of digital television development," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.8-21, Jan.2006.

M.S.Richer，G.Reitmeier，T.Gurley，G.A.Jones，J.Whitaker，and R.Rast.“The ATSC digital television system，”Proceedings of the IEEE，Special Issue on Global Digital Television：Technology and Emerging Services，pp.37-43，Jan.2006.M.S.Richer, G.Reitmeier, T.Gurley, G.A.Jones, J.Whitaker, and R.Rast. "The ATSC digital television system," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp. 37-43, Jan. 2006.

U.Ladebusch and C.A.Liss.“Terrestrial DVB(DVB-T)：A broadcast technologyfor stationary portable and mobile use，”Proceedings of the IEEE，SpecialIssue on Global Digital Television：Technology and Emerging Services，pp.183-194，Jan.2006.U.Ladebusch and C.A.Liss. "Terrestrial DVB (DVB-T): A broadcast technology for stationary portable and mobile use," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.183-194, J 2006.

M.Takada and M.Saito.“Transmission systems for ISDB-T，”Proceedings ofthe IEEE，Special Issue on Global Digital Television ：Technology and EmergingServices，pp.251-256，Jan.2006.M. Takada and M. Saito. "Transmission systems for ISDB-T," Proceedings of the IEEE, Special Issue on Global Digital Television: Technology and Emerging Services, pp.251-256, Jan.2006.

Z.Li，L.Chen，L.Zeng，S.Lin，W.Fong，“Efficient encoding of quasi-cycliclow-density parity-check codes，”IEEE Trans.Commun.，vol.54，no.1，pp.71-81，Jan.2006.Z.Li, L.Chen, L.Zeng, S.Lin, W.Fong, "Efficient encoding of quasi-cycliclow-density parity-check codes," IEEE Trans.Commun., vol.54, no.1, pp .71-81, Jan. 2006.

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抗噪声移动数字广播问题，提出了一种抗噪声移动数字广播信号传输方法。Aiming at the problem of high data rate controllable multi-service digital TV anti-noise mobile digital broadcasting, the invention proposes a noise-resistant mobile digital broadcasting signal transmission method.

本发明提出的一种抗噪声移动数字广播信号传输方法，其特征在于它包括下列步骤：A kind of anti-noise mobile digital broadcasting signal transmission method that the present invention proposes is characterized in that it comprises the following steps:

1)抗噪声移动数字广播信号发射机将多媒体数据流经媒体数据处理器转换成比特流，利用反馈移位寄存器产生的扰码序列进行加扰处理以形成输入数据比特流；1) The anti-noise mobile digital broadcast signal transmitter converts the multimedia data stream into a bit stream through the media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form the input data bit stream;

2)抗噪声移动数字广播信号发射机将自己的输入数据比特流经LDPC编码、码元调制与码元旋转后在频域上形成FFT编码数据块，FFT表示快速离散傅立叶变换，FFT编码数据块的长度为K；码元调制为QPSK、16QAM、64QAM和256QAM中的一种，码元调制的码元星座图映射方式采用格雷码映射；码元旋转通过对码元星座图旋转一定角度而实现，QPSK的码元星座图旋转角度为22.5度，16QAM的码元星座图旋转角度为11.25度，64QAM的码元星座图旋转角度为5.626度，256QAM的码元星座图旋转角度为2.8125度；2) The anti-noise mobile digital broadcast signal transmitter forms an FFT encoded data block in the frequency domain after its input data bit stream undergoes LDPC encoding, symbol modulation and symbol rotation. FFT stands for Fast Discrete Fourier Transform, and FFT encoded data block The length is K; the symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle , the rotation angle of the symbol constellation diagram of QPSK is 22.5 degrees, the rotation angle of the symbol constellation diagram of 16QAM is 11.25 degrees, the rotation angle of the symbol constellation diagram of 64QAM is 5.626 degrees, and the rotation angle of the symbol constellation diagram of 256QAM is 2.8125 degrees;

3)抗噪声移动数字广播信号发射机采用IFFT将FFT编码数据块变换为时域离散编码数据样值块D_total，IFFT表示快速离散傅立叶反变换；3) The anti-noise mobile digital broadcast signal transmitter uses IFFT to transform the FFT coded data block into a time-domain discrete coded data sample block D_total , and IFFT stands for Inverse Fast Discrete Fourier Transform;

4)抗噪声移动数字广播信号发射机按顺序将时域离散编码数据样值块平分成两块，时域离散编码数据样值子块D₁和时域离散编码数据样值子块D₂，D_total＝[D₁，D₂]；4) The anti-noise mobile digital broadcast signal transmitter divides the time-domain discretely coded data sample block into two equally in sequence, the time-domain discretely coded data sample sub-block D₁ and the time-domain discretely coded data sample sub-block D₂ , D_total = [D₁ , D₂ ];

5)抗噪声移动数字广播信号发射机通过峰均功率比调整单元对时域离散编码数据样值子块D₁、时域离散编码数据样值子块D₂进行信号加、减、共轭运算处理并重新合成新的时域离散编码数据样值块D_new，新的时域离散编码数据样值块D_new采用如下生成模式得到，生成模式1为D_new＝[D₁，D₂]，生成模式2为$D_{\mathrm{new}}=[D_1,\sqrt{1/2}(D_1+D_2)],$生成模式3为$D_{\mathrm{new}}=[D_1,\sqrt{1/2}(D_1-D_2)],$生成模式4为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),D_2],$生成模式5为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1-D_2),D_2],$生成模式6为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),\sqrt{1/2}(D_1-D_2)],$生成模式7为D_new＝[D^*₁，D₂]，生成模式8为$D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1+D_2)],$生成模式9为$D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1-D_2)],$生成模式10为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),D_2],$生成模式11为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1-D_2),D_2],$生成模式12为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),\sqrt{1/2}({D^{*}}_1-D_2)],$比较12种生成模式合成的时域离散编码数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比时域离散编码数据样值块

并将降峰均功率比时域离散编码数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^*₁表示对时域离散编码数据样值子块D₁的各时域离散编码数据样值进行共轭运算处理而得到的时域离散编码数据样值子块；5) The anti-noise mobile digital broadcast signal transmitter performs signal addition, subtraction, and conjugate operations on the time-domain discrete coded data sample sub-block D₁ and the time-domain discrete coded data sample sub-block D₂ through the peak-to-average power ratio adjustment unit Process and re-synthesize a new time-domain discretely coded data sample block_Dnew , the new time-domain discretely coded data sample block_Dnew is obtained using the following generation mode, generation mode 1 is_Dnew = [D₁ , D₂ ], Generate schema 2 as${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D_new = [D^*₁ , D₂ ], generation mode 8 is${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2)],$ Generate schema 9 as${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 12 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete-coded data sample block D_new synthesized by 12 generation modes, and select the time-domain discrete-coded data sample block with the lowest peak-to-average power ratio

and reduce the peak-to-average power ratio time-domain discretely coded data sample block

The generated mode information correspondingly adopted is sent to the service index sequence setting unit, wherein, D^*₁ means that the time domain discrete coded data samples of the time domain discrete coded data sample sub-block_D1 are conjugated and processed Time-domain discretely coded data sample sub-blocks;

6)抗噪声移动数字广播信号发射机将训练序列作为复数训练序列的实部序列、将业务指标序列设置单元所设置的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，业务指标序列包含着并且唯一表达着抗噪声移动数字广播信号发射机的各系统参数和业务模式信息；6) The anti-noise mobile digital broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence to form a complex training sequence in the time domain The discrete sample value blocks of the sequence, the length of the discrete sample value blocks of the training sequence, the service index sequence, and the complex training sequence are all X, and the service index sequence contains and uniquely expresses the system parameters and parameters of the anti-noise mobile digital broadcasting signal transmitter business model information;

7)抗噪声移动数字广播信号发射机将在时域上构成的复数训练序列的离散样值块在时域上连续重复4次形成时域嵌入训练序列离散样值块，时域嵌入训练序列离散样值块的长度与降峰均功率比时域离散编码数据样值块的长度在数值上相等，即K＝4×X；7) The anti-noise mobile digital broadcast signal transmitter repeats the discrete sample blocks of the complex training sequence formed in the time domain for 4 consecutive times in the time domain to form a time domain embedded training sequence discrete sample block, and the time domain embedded training sequence is discrete The length of the sample value block is numerically equal to the length of the time-domain discretely encoded data sample block with reduced peak-to-average power ratio, that is, K=4×X;

8)抗噪声移动数字广播信号发射机将降峰均功率比时域离散编码数据样值块、时域嵌入训练序列离散样值块直接叠加形成时域嵌入训练序列降峰均功率比时域离散编码数据样值块，作为帧体；8) The anti-noise mobile digital broadcasting signal transmitter directly superposes the time-domain discrete coded data sample block with reduced peak-to-average power ratio and the discrete sample value block of the time-domain embedded training sequence to form a time-domain embedded training sequence with reduced peak-to-average power ratio time-domain discrete coded data sample blocks as frame bodies;

9)抗噪声移动数字广播信号发射机将循环前缀作为保护间隔即帧头插入时域嵌入训练序列降峰均功率比时域离散编码数据样值块即帧体，以形成信号帧，循环前缀的长度为C；9) The anti-noise mobile digital broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, the frame header is inserted into the time domain embedding training sequence to reduce the peak-to-average power ratio, and the time domain discretely encoded data sample block is the frame body to form a signal frame, and the cyclic prefix length is C;

10)抗噪声移动数字广播信号发射机采用平方根升余弦滚降滤波器对信号帧的信号脉冲成形；10) The anti-noise mobile digital broadcast signal transmitter adopts the square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

11)抗噪声移动数字广播信号发射机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；11) The anti-noise mobile digital broadcasting signal transmitter up-converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air;

12)抗噪声移动数字广播信号接收机检测接收抗噪声移动数字广播信号发射机所发送的射频信号并将其下变频形成基带信号，利用信号帧的循环前缀特性和信号帧的结构特性进行基带信号接收处理。12) The anti-noise mobile digital broadcast signal receiver detects and receives the radio frequency signal sent by the anti-noise mobile digital broadcast signal transmitter and down-converts it to form a baseband signal, and uses the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame to perform baseband signal Receive processing.

按照上述的抗噪声移动数字广播信号传输方法，其特征在于：抗噪声移动数字广播信号发射机的降峰均功率比时域离散编码数据样值块由时域离散编码数据样值子块通过特定12种生成模式而进行的信号加、减、共轭运算处理而重新合成；抗噪声移动数字广播信号发射机的信号帧中具有周期性的时域嵌入训练序列离散样值块；抗噪声移动数字广播信号发射机的训练序列的长度X为512、1024、2048中的一个，相对应的FFT数据块的长度K分别为2048、4096、8192，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数据块长度K大小的1/4、1/8、1/16；抗噪声移动数字广播信号发射机的训练序列、业务指标序列由一系列的1或-1组成，具有伪随机特性；抗噪声移动数字广播信号发射机的训练序列、业务指标序列相互之间具有正交性；抗噪声移动数字广播信号发射机的各个不同的业务指标序列包含着并且唯一表达着抗噪声移动数字广播信号发射机的各系统参数和业务模式信息；对输入数据进行LDPC编码的编码率为1/4、1/2、5/8、3/4和7/8中的一个。抗噪声移动数字广播信号接收机能够充分利用信号帧的循环前缀特性和信号帧的结构特性进行基带信号接收处理，其中包括对信号帧头与信号帧体的时频域联合迭代分离处理。According to the above-mentioned anti-noise mobile digital broadcasting signal transmission method, it is characterized in that: the reduced peak-to-average power ratio of the anti-noise mobile digital broadcasting signal transmitter is determined by the time-domain discretely coded data sample sub-block through a specific 12 kinds of generation modes for signal addition, subtraction, conjugate operation processing and re-synthesis; anti-noise mobile digital broadcasting signal transmitter has periodic time-domain embedded training sequence discrete sample blocks in the signal frame; anti-noise mobile digital The length X of the training sequence of the broadcast signal transmitter is one of 512, 1024, and 2048, the length K of the corresponding FFT data block is 2048, 4096, and 8192 respectively, and the frequency intervals of the corresponding subcarriers are 4KHz and 2KHz respectively , 1KHz, and the corresponding cyclic prefix lengths C are 1/4, 1/8, and 1/16 of the size of the FFT data block length K respectively; the training sequence and service index sequence of the anti-noise mobile digital broadcasting signal transmitter consist of a series of Composed of 1 or -1, it has pseudo-random characteristics; the training sequence and service index sequence of the anti-noise mobile digital broadcasting signal transmitter are orthogonal to each other; the different service index sequences of the anti-noise mobile digital broadcasting signal transmitter include It expresses and uniquely expresses the system parameters and business mode information of the anti-noise mobile digital broadcasting signal transmitter; the encoding rate of LDPC encoding for input data is 1/4, 1/2, 5/8, 3/4 and 7/ One of 8. The anti-noise mobile digital broadcast signal receiver can make full use of the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame for baseband signal reception processing, including joint iterative separation processing of the time-frequency domain of the signal frame header and signal frame body.

本发明的特点：Features of the present invention:

本发明是一种时域频域混合的传输方案。本发明的降峰均功率比时域离散编码数据样值块的生成模式和具有最低峰均功率比的降峰均功率比时域离散编码数据样值块选取方法，不仅能够充分利用OFDM信号的最大峰值功率很高但是大峰值功率信号概率非常低、当子载波数目较大时的OFDM信号的实部(或虚部)为复高斯随机过程且幅度服从Rayleigh分布的特性，所采用的生成模式所需额外发送的信息量小，易于在接收机端处理恢复得到OFDM信号的原始信号，同时不会破坏子载波信号的正交特性也不会产生额外的非线性失真。抗噪声移动数字广播信号发射机的信号帧中具有周期性的时域嵌入训练序列离散样值块，抗噪声移动数字广播信号发射机的训练序列、业务指标序列具有伪随机特性，抗噪声移动数字广播信号发射机的训练序列、业务指标序列相互之间具有正交性，抗噪声移动数字广播信号发射机的时域嵌入训练序列降峰均功率比时域离散编码数据样值块是由降峰均功率比时域离散编码数据样值块、时域嵌入训练序列离散样值块直接叠加而形成的，这些保证了抗噪声移动数字广播信号接收机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。将循环前缀作为保护间隔插入时域嵌入训练序列降峰均功率比时域离散编码数据样值块以形成信号帧，可以减少相邻信号帧之间的干扰影响。采用LDPC编码对输入数据进行信道编码提供了接近香农极限的纠错性能。码元调制与星座旋转提供了移动数字广播信号的分集效果。抗噪声移动数字广播信号发射机的各个不同的业务指标序列包含着并且唯一表达着抗噪声移动数字广播信号发射机的各系统参数和业务模式信息，可以使得数字电视抗噪声移动数字广播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。本发明的传输方法具有低峰均功率比、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抗噪声移动数字广播传输等诸多优点。The present invention is a mixed transmission scheme of time domain and frequency domain. The generation mode of the time-domain discrete coded data sample block with reduced peak-to-average power ratio and the method for selecting the time-domain discrete-coded data sample block with the lowest peak-to-average power ratio of the present invention can not only make full use of the OFDM signal The maximum peak power is very high but the probability of high peak power signal is very low. When the number of subcarriers is large, the real part (or imaginary part) of OFDM signal is a complex Gaussian random process and the amplitude obeys the characteristics of Rayleigh distribution. The generation mode adopted The amount of additional information required to be sent is small, and the original signal of the OFDM signal is easy to process and recover at the receiver, and at the same time, the orthogonality characteristic of the sub-carrier signal will not be destroyed and additional nonlinear distortion will not be generated. The signal frame of the anti-noise mobile digital broadcast signal transmitter has a periodic time-domain embedded training sequence discrete sample block, the training sequence and service index sequence of the anti-noise mobile digital broadcast signal transmitter have pseudo-random characteristics, and the anti-noise mobile digital The training sequence and service index sequence of the broadcast signal transmitter are orthogonal to each other, and the time-domain embedding training sequence of the anti-noise mobile digital broadcast signal transmitter reduces the peak-to-average power ratio than the time-domain discrete coded data sample block. The average power ratio time domain discrete coded data sample block and the time domain embedded training sequence discrete sample block are directly superimposed, which ensures that the anti-noise mobile digital broadcasting signal receiver can achieve fast and accurate frame synchronization, frequency synchronization, and time synchronization. Synchronization, estimation of channel transfer characteristics, and reliable tracking of phase noise and channel transfer characteristics. Inserting the cyclic prefix as a guard interval into the time-domain embedding training sequence to reduce the peak-to-average power ratio time-domain discretely coded data sample blocks to form a signal frame can reduce the interference between adjacent signal frames. Channel coding the input data with LDPC codes provides error correction performance close to the Shannon limit. Symbol modulation and constellation rotation provide diversity effects for mobile digital broadcasting signals. Each different service index sequence of the anti-noise mobile digital broadcast signal transmitter contains and uniquely expresses the system parameters and business mode information of the anti-noise mobile digital broadcast signal transmitter, which can make the digital TV anti-noise mobile digital broadcast transmission system able to Provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, and multimedia value-added services to meet social needs. The transmission method of the present invention has many advantages such as low peak-to-average power ratio, short synchronization time, small clock jitter, anti-channel fading, anti-channel interference, high data rate, controllable multi-service digital TV, anti-noise mobile digital broadcast transmission, and the like.

附图说明Description of drawings

图1是按照本发明的抗噪声移动数字广播信号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 according to the noise-resistant mobile digital broadcasting signal transmission method of the present invention.

图2是按照本发明的抗噪声移动数字广播信号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 transmitter and a receiver according to the anti-noise mobile digital broadcasting signal 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.

按照本发明提出的抗噪声移动数字广播信号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，如图1所示，按下列步骤进行：According to the schematic diagram of an embodiment of signal transmission between a transmitter and a receiver of the anti-noise mobile digital broadcasting signal transmission method proposed by the present invention, as shown in Figure 1, the following steps are carried out:

1)该某个抗噪声移动数字广播信号发射机将多媒体数据流经媒体数据处理器转换成比特流，利用反馈移位寄存器产生的扰码序列进行加扰处理以形成输入数据比特流；1) The certain anti-noise mobile digital broadcast signal transmitter converts the multimedia data stream into a bit stream through a media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form an input data bit stream;

2)该某个抗噪声移动数字广播信号发射机将自己的输入数据比特流经LDPC编码、码元调制与码元旋转后在频域上形成FFT编码数据块，FFT表示快速离散傅立叶变换，FFT编码数据块的长度为K；对输入数据进行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，码元调制的码元星座图映射方式采用格雷码映射；码元旋转通过对码元星座图旋转一定角度而实现，QPSK的码元星座图旋转角度为22.5度，16QAM的码元星座图旋转角度为11.25度，64QAM的码元星座图旋转角度为5.626度，256QAM的码元星座图旋转角度为2.8125度；2) The certain anti-noise mobile digital broadcast signal transmitter forms an FFT encoded data block in the frequency domain after its input data bit stream undergoes LDPC encoding, symbol modulation and symbol rotation. FFT stands for Fast Discrete Fourier Transform, and FFT The length of the encoded data block is K; the encoding rate of LDPC encoding on the input data is one of 1/4, 1/2, 5/8, 3/4 and 7/8; the symbol modulation is QPSK, 16QAM, 64QAM And one of 256QAM, the symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle, and the symbol constellation rotation angle of QPSK is 22.5 degrees, 16QAM The rotation angle of the symbol constellation diagram of 11.25 degrees, the rotation angle of the symbol constellation diagram of 64QAM is 5.626 degrees, and the rotation angle of the symbol constellation diagram of 256QAM is 2.8125 degrees;

3)该某个抗噪声移动数字广播信号发射机采用IFFT将FFT编码数据块变换为时域离散编码数据样值块D_total，IFFT表示快速离散傅立叶反变换；3) The certain anti-noise mobile digital broadcast signal transmitter uses IFFT to transform the FFT coded data block into a time-domain discrete coded data sample block D_total , and IFFT stands for Inverse Fast Discrete Fourier Transform;

4)该某个抗噪声移动数字广播信号发射机按顺序将时域离散编码数据样值块平分成两块，时域离散编码数据样值子块D₁和时域离散编码数据样值子块D₂，D_total＝[D₁，D₂]；4) The certain anti-noise mobile digital broadcast signal transmitter divides the time-domain discretely coded data sample block into two equally in sequence, the time-domain discretely coded data sample sub-block_D1 and the time-domain discretely coded data sample sub-block D₂ , D_total = [D₁ , D₂ ];

5)该某个抗噪声移动数字广播信号发射机通过峰均功率比调整单元对时域离散编码数据样值子块D₁、时域离散编码数据样值子块D₂进行信号加、减、共轭运算处理并重新合成新的时域离散编码数据样值块D_new，新的时域离散编码数据样值块D_new采用如下生成模式得到，生成模式1为D_new＝[D₁，D₂]，生成模式2为$D_{\mathrm{new}}=[D_1,\sqrt{1/2}(D_1+D_2)],$生成模式3为$D_{\mathrm{new}}=[D_1,\sqrt{1/2}(D_1-D_2)],$生成模式4为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),D_2],$生成模式5为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1-D_2),D_2],$生成模式6为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),\sqrt{1/2}(D_1-D_2)],$生成模式7为D_new＝[D^*₁，D₂]，生成模式8为$D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1+D_2)],$生成模式9为$D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1-D_2)],$生成模式10为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),D_2],$生成模式11为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1-D_2),D_2],$生成模式12为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),\sqrt{1/2}({D^{*}}_1-D_2)],$比较12种生成模式合成的时域离散编码数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比时域离散编码数据样值块

并将降峰均功率比时域离散编码数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^*₁表示对时域离散编码数据样值子块D₁的各时域离散编码数据样值进行共轭运算处理而得到的时域离散编码数据样值子块；5) The certain anti-noise mobile_digital broadcasting signal transmitter performs signal addition,_subtraction , The conjugate operation processes and re-synthesizes a new time-domain discretely coded data sample block D_new , and the new time-domain discretely coded data sample block D_new is obtained by the following generation mode, and the generation mode 1 is D_new =[D₁ , D₂ ], generating pattern 2 as${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D_new = [D^*₁ , D₂ ], generation mode 8 is${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2)],$ Generate schema 9 as${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 12 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete-coded data sample block D_new synthesized by 12 generation modes, and select the time-domain discrete-coded data sample block with the lowest peak-to-average power ratio

and reduce the peak-to-average power ratio time-domain discretely coded data sample block

The generated mode information correspondingly adopted is sent to the service index sequence setting unit, wherein, D^*₁ means that the time domain discrete coded data samples of the time domain discrete coded data sample sub-block_D1 are conjugated and processed Time-domain discretely coded data sample sub-blocks;

7)该某个抗噪声移动数字广播信号发射机将训练序列作为复数训练序列的实部序列、将业务指标序列设置单元所设置的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，业务指标序列包含着并且唯一表达着抗噪声移动数字广播信号发射机的各系统参数和业务模式信息，X取512、1024、2048中的一个；7) The certain anti-noise mobile digital broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence, in the time domain The discrete sample value blocks that constitute the complex training sequence, the length of the discrete sample value blocks of the training sequence, service index sequence, and complex training sequence are all X, and the service index sequence contains and uniquely expresses each of the anti-noise mobile digital broadcasting signal transmitters. System parameters and business mode information, X takes one of 512, 1024, and 2048;

7)该某个抗噪声移动数字广播信号发射机将在时域上构成的复数训练序列的离散样值块在时域上连续重复4次形成时域嵌入训练序列离散样值块，时域嵌入训练序列离散样值块的长度与降峰均功率比时域离散编码数据样值块的长度在数值上相等，即K＝4×X；当X取512时，K取2048，相对应的子载波的频率间隔取4KHz；当X取1024时，K取4096，相对应的子载波的频率间隔取2KHz；当X取2048时，K取8192，相对应的子载波的频率间隔取1KHz；7) The certain anti-noise mobile digital broadcasting signal transmitter repeats the discrete sample value blocks of the complex training sequence formed in the time domain continuously 4 times in the time domain to form the time domain embedded training sequence discrete sample value blocks, and the time domain embedding The length of the discrete sample value block of the training sequence is equal to the length of the time-domain discrete coded data sample value block with reduced peak-to-average power ratio, that is, K=4×X; when X is 512, K is 2048, and the corresponding sub The frequency interval of the carrier is 4KHz; when X is 1024, K is 4096, and the frequency interval of the corresponding subcarrier is 2KHz; when X is 2048, K is 8192, and the frequency interval of the corresponding subcarrier is 1KHz;

8)该某个抗噪声移动数字广播信号发射机将降峰均功率比时域离散编码数据样值块、时域嵌入训练序列离散样值块直接叠加形成时域嵌入训练序列降峰均功率比时域离散编码数据样值块，作为帧体；8) The certain anti-noise mobile digital broadcasting signal transmitter directly superposes the peak-to-average power ratio time-domain discrete coded data sample block and the time-domain embedded training sequence discrete sample block to form a time-domain embedded training sequence with a reduced peak-to-average power ratio Discretely coded data sample blocks in the time domain, as a frame body;

9)该某个抗噪声移动数字广播信号发射机将循环前缀作为保护间隔即帧头插入时域嵌入训练序列降峰均功率比时域离散编码数据样值块即帧体，以形成信号帧，循环前缀的长度为C；当X取512时，C取K大小的1/4；当X取1024时，C取K大小的1/8；当X取2048时，C取K大小的1/16；9) The certain anti-noise mobile digital broadcasting signal transmitter inserts the cyclic prefix as the guard interval, that is, the frame header, into the time domain embedding training sequence to reduce the peak-to-average power ratio time domain discretely encoded data sample block, that is, the frame body, to form a signal frame, The length of the cyclic prefix is C; when X is 512, C is 1/4 of the size of K; when X is 1024, C is 1/8 of the size of K; when X is 2048, C is 1/4 of the size of K 16;

10)该某个抗噪声移动数字广播信号发射机采用平方根升余弦滚降滤波器对信号帧的信号脉冲成形；10) The certain anti-noise mobile digital broadcast signal transmitter adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

11)该某个抗噪声移动数字广播信号发射机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；11) The certain anti-noise mobile digital broadcast signal transmitter up-converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air;

12)该某个抗噪声移动数字广播信号接收机检测接收抗噪声移动数字广播信号发射机所发送的射频信号并将其下变频形成基带信号，利用信号帧的循环前缀特性和信号帧的结构特性进行基带信号接收处理，其中包括对信号帧头与信号帧体的时频域联合迭代分离处理。12) The certain anti-noise mobile digital broadcast signal receiver detects and receives the radio frequency signal sent by the anti-noise mobile digital broadcast signal transmitter and down-converts it to form a baseband signal, using the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame Perform baseband signal reception processing, including joint iterative separation processing of the time-frequency domain of the signal frame header and signal frame body.

按照本发明的抗噪声移动数字广播信号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，如图2所示，具体实施如下：According to the schematic diagram of an embodiment of signal frame formation in the process of signal transmission between a certain transmitter and receiver according to the anti-noise mobile digital broadcast signal transmission method of the present invention, as shown in Figure 2, the specific implementation is as follows:

该某个抗噪声移动数字广播信号发射机将多媒体数据流经媒体数据处理器转换成比特流，利用反馈移位寄存器产生的扰码序列进行加扰处理以形成输入数据比特流。The certain anti-noise mobile digital broadcast signal transmitter converts the multimedia data stream into a bit stream through a media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form an input data bit stream.

该某个抗噪声移动数字广播信号发射机将自己的输入数据比特流经LDPC编码、码元调制与码元旋转后在频域上形成FFT编码数据块，再经IFFT将其变换为时域的离散编码数据样值块，通过峰均功率比调整单元生成选取其中具有最低峰均功率比的降峰均功率比时域离散编码数据样值块同时将所对应采用的生成模式信息发送给业务指标序列设置单元。码元调制为QPSK、16QAM、64QAM和256QAM中的一种，码元调制的码元星座图映射方式采用格雷码映射；码元旋转通过对码元星座图旋转一定角度而实现，QPSK的码元星座图旋转角度为22.5度，16QAM的码元星座图旋转角度为11.25度，64QAM的码元星座图旋转角度为5.626度，256QAM的码元星座图旋转角度为2.8125度。FFT数据块由子载波组成。FFT数据块的长度为K；当X取512时，相对应的K取2048，相对应的子载波的频率间隔取4KHz；当X取1024时，相对应的K取4096，相对应的子载波的频率间隔取2KHz；当X取2048时，相对应的K取8192，相对应的子载波的频率间隔取1KHz。The anti-noise mobile digital broadcast signal transmitter forms an FFT encoded data block in the frequency domain after its input data bit stream undergoes LDPC encoding, symbol modulation and symbol rotation, and then transforms it into a time domain by IFFT Discretely coded data sample blocks are generated by the peak-to-average power ratio adjustment unit to select the time-domain discrete coded data sample blocks with the lowest peak-to-average power ratio, and the corresponding generation mode information is sent to the business indicator Sequence setting unit. The symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM. The symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is realized by rotating the symbol constellation at a certain angle. The QPSK symbol The rotation angle of the constellation diagram is 22.5 degrees, the rotation angle of the symbol constellation diagram of 16QAM is 11.25 degrees, the rotation angle of the symbol constellation diagram of 64QAM is 5.626 degrees, and the rotation angle of the symbol constellation diagram of 256QAM is 2.8125 degrees. The FFT data block consists of subcarriers. The length of the FFT data block is K; when X is 512, the corresponding K is 2048, and the frequency interval of the corresponding subcarrier is 4KHz; when X is 1024, the corresponding K is 4096, and the corresponding subcarrier The frequency interval of the frequency is 2KHz; when X is 2048, the corresponding K is 8192, and the frequency interval of the corresponding subcarrier is 1KHz.

该某个抗噪声移动数字广播信号发射机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，再在时域上将其连续重复4次形成时域嵌入训练序列离散样值块。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，X取512、1024、2048中的一个，时域嵌入训练序列离散样值块的长度为K，K＝4×X。作为抗噪声移动数字广播信号发射机的训练序列、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。各个不同的业务指标序列包含着并且唯一表达着抗噪声移动数字广播信号发射机的各系统参数和业务模式信息。该某个抗噪声移动数字广播信号发射机将降峰均功率比时域离散编码数据样值块、时域嵌入训练序列离散样值块直接叠加形成时域嵌入训练序列降峰均功率比时域离散编码数据样值块，作为帧体；在时域嵌入训练序列降峰均功率比时域离散编码数据样值块中插入循环前缀作为保护间隔，形成信号帧。作为保护间隔的循环前缀的长度为C；当X取512时，相对应的C取K大小的1/4；当X取1024时，相对应的C取K大小的1/8；当X取2048时，相对应的C取K大小的1/16。该某个抗噪声移动数字广播信号发射机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X取512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X取1024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X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0.025。The certain anti-noise mobile digital broadcast signal transmitter 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 value blocks of the complex training sequence in the time domain, Repeat it four times continuously in the time domain to form discrete sample blocks of time domain embedding training sequence. The length of the discrete sample block of the training sequence, the service index sequence, and the complex training sequence is X, where X is one of 512, 1024, and 2048, and the length of the discrete sample block of the time domain embedded training sequence is K, K=4× X. As the anti-noise mobile digital broadcast signal transmitter, the training sequence and service index sequence are composed of a series of 1 or -1, which have 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. Each different service index sequence contains and uniquely expresses various system parameters and service mode information of the anti-noise mobile digital broadcasting signal transmitter. This certain anti-noise mobile digital broadcasting signal transmitter directly superimposes the time-domain discrete coded data sample block with reduced peak-to-average power ratio and the discrete sample value block of the time-domain embedded training sequence to form a time-domain embedded training sequence with reduced peak-to-average power ratio in the time domain The discrete coded data sample block is used as a frame body; a cyclic prefix is inserted into the time domain embedded training sequence peak-to-average power ratio time domain discrete coded data sample block as a guard interval to form a signal frame. The length of the cyclic prefix used as the guard interval is C; when X takes 512, the corresponding C takes 1/4 of the size of K; when X takes 1024, the corresponding C takes 1/8 of the size of K; when X takes When 2048, the corresponding C takes 1/16 of the size of K. The certain noise-resistant mobile digital broadcast signal transmitter uses a square root raised cosine roll-off filter to pulse shape the signal of the signal frame. When X is 512, 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 X is 1024, 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 X is 2048, the corresponding roll-off coefficient of the square root raised cosine roll-off filter for pulse shaping the signal frame is 0.025.

该某个抗噪声移动数字广播信号发射机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 anti-noise mobile digital broadcast signal transmitter converts the baseband signal up to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air.

该某个抗噪声移动数字广播信号接收机检测接收抗噪声移动数字广播信号发射机所发送的射频信号并将其下变频形成基带信号，利用信号帧的循环前缀特性和信号帧的结构特性进行基带信号接收处理，其中包括对信号帧头与信号帧体的时频域联合迭代分离处理。The anti-noise mobile digital broadcast signal receiver detects and receives the radio frequency signal sent by the anti-noise mobile digital broadcast signal transmitter and converts it down to form a baseband signal, and uses the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame to perform baseband signal processing. Signal receiving processing, which includes time-frequency domain joint iterative separation processing of signal frame header and signal frame body.

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.

Claims (7)

Translated fromChinese

1.一种抗噪声移动数字广播信号传输方法，其特征在于它包括下列步骤：1. An anti-noise mobile digital broadcasting signal transmission method is characterized in that it comprises the following steps:1)抗噪声移动数字广播信号发射机将多媒体数据流经媒体数据处理器转换成比特流，利用反馈移位寄存器产生的扰码序列进行加扰处理以形成输入数据比特流；1) The anti-noise mobile digital broadcast signal transmitter converts the multimedia data stream into a bit stream through the media data processor, and uses the scrambling code sequence generated by the feedback shift register to perform scrambling processing to form the input data bit stream;2)抗噪声移动数字广播信号发射机将自己的输入数据比特流经LDPC编码、码元调制与码元旋转后在频域上形成FFT编码数据块，LDPC表示低密度奇偶校验，FFT表示快速离散傅立叶变换，FFT编码数据块的长度为K；码元调制为QPSK、16QAM、64QAM和256QAM中的一种，码元调制的码元星座图映射方式采用格雷码映射；码元旋转通过对码元星座图旋转一定角度而实现，QPSK的码元星座图旋转角度为22.5度，16QAM的码元星座图旋转角度为11.25度，64QAM的码元星座图旋转角度为5.626度，256QAM的码元星座图旋转角度为2.8125度；2) The anti-noise mobile digital broadcast signal transmitter forms an FFT encoded data block in the frequency domain after its input data bit stream undergoes LDPC encoding, symbol modulation and symbol rotation. LDPC means low-density parity check, and FFT means fast Discrete Fourier transform, the length of FFT encoded data block is K; the symbol modulation is one of QPSK, 16QAM, 64QAM and 256QAM, and the symbol constellation mapping method of symbol modulation adopts Gray code mapping; the symbol rotation is through the code The symbol constellation diagram is rotated at a certain angle. The rotation angle of the symbol constellation diagram of QPSK is 22.5 degrees, the rotation angle of the symbol constellation diagram of 16QAM is 11.25 degrees, the rotation angle of the symbol constellation diagram of 64QAM is 5.626 degrees, and the rotation angle of the symbol constellation diagram of 256QAM is 5.626 degrees. The graph rotation angle is 2.8125 degrees;3)抗噪声移动数字广播信号发射机采用IFFT将FFT编码数据块变换为时域离散编码数据样值块D_total，IFFT表示快速离散傅立叶反变换；3) The anti-noise mobile digital broadcast signal transmitter uses IFFT to transform the FFT coded data block into a time-domain discrete coded data sample block D_total , and IFFT stands for Inverse Fast Discrete Fourier Transform;4)抗噪声移动数字广播信号发射机按顺序将时域离散编码数据样值块平分成两块，时域离散编码数据样值子块D₁和时域离散编码数据样值子块D₂，D_total＝[D₁，D₂]；4) The anti-noise mobile digital broadcast signal transmitter divides the time-domain discretely coded data sample block into two equally in sequence, the time-domain discretely coded data sample sub-block D₁ and the time-domain discretely coded data sample sub-block D₂ , D_total = [D₁ , D₂ ];5)抗噪声移动数字广播信号发射机通过峰均功率比调整单元对时域离散编码数据样值子块D₁、时域离散编码数据样值子块D₂进行信号加、减、共轭运算处理并重新合成新的时域离散编码数据样值块D_new，新的时域离散编码数据样值块D_new采用如下生成模式得到，生成模式1为D_new＝[D₁，D₂]，生成模式2为$D_{\mathrm{new}}=[D_1,\sqrt{1/2}(D_1+D_2)],$生成模式3为$D_{\mathrm{new}}=[D_1,\sqrt{1/2}(D_1-D_2)],$生成模式4为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),D_2],$生成模式5为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1-D_2),D_2],$生成模式6为$D_{\mathrm{new}}=[\sqrt{1/2}(D_1+D_2),\sqrt{1/2}(D_1-D_2)],$生成模式7为D_new＝[D^*₁，D₂]，生成模式8为$D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1+D_2)],$生成模式9为$D_{\mathrm{new}}=[{D^{*}}_1,\sqrt{1/2}({D^{*}}_1-D_2)],$生成模式10为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),D_2],$生成模式11为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1-D_2),D_2],$生成模式12为$D_{\mathrm{new}}=[\sqrt{1/2}({D^{*}}_1+D_2),\sqrt{1/2}({D^{*}}_1-D_2)],$比较12种生成模式合成的时域离散编码数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比时域离散编码数据样值块并将降峰均功率比时域离散编码数据样值块

所对应采用的生成模式信息发送给业务指标序列设置单元，其中，D^*₁表示对时域离散编码数据样值子块D₁的各时域离散编码数据样值进行共轭运算处理而得到的时域离散编码数据样值子块；5) The anti-noise mobile digital broadcast signal transmitter performs signal addition, subtraction, and conjugate operations on the time-domain discrete coded data sample sub-block D₁ and the time-domain discrete coded data sample sub-block D₂ through the peak-to-average power ratio adjustment unit Process and re-synthesize a new time-domain discretely coded data sample block_Dnew , the new time-domain discretely coded data sample block_Dnew is obtained using the following generation mode, generation mode 1 is_Dnew = [D₁ , D₂ ], Generate schema 2 as${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ Generate schema 3 as${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generate schema 4 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 5 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 6 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({\mathrm{D.}}_1-{\mathrm{D.}}_2)],$ Generation mode 7 is D_new = [D^*₁ , D₂ ], generation mode 8 is${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2)],$ Generate schema 9 as${\mathrm{D.}}_{\mathrm{new}}=[{{\mathrm{D.}}^{*}}_1,\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Generate schema 10 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 11 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2),{\mathrm{D.}}_2],$ Generate schema 12 as${\mathrm{D.}}_{\mathrm{new}}=[\sqrt{1/2}({{\mathrm{D.}}^{*}}_1+{\mathrm{D.}}_2),\sqrt{1/2}({{\mathrm{D.}}^{*}}_1-{\mathrm{D.}}_2)],$ Compare the time-domain discrete-coded data sample block D_new synthesized by 12 generation modes, and select the time-domain discrete-coded data sample block with the lowest peak-to-average power ratio and reduce the peak-to-average power ratio time-domain discretely coded data sample block

The generated mode information correspondingly adopted is sent to the service index sequence setting unit, wherein, D^*₁ means that the time domain discrete coded data samples of the time domain discrete coded data sample sub-block_D1 are conjugated and processed Time-domain discretely coded data sample sub-blocks;6)抗噪声移动数字广播信号发射机将训练序列作为复数训练序列的实部序列、将业务指标序列设置单元所设置的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，业务指标序列包含着并且唯一表达着抗噪声移动数字广播信号发射机的各系统参数和业务模式信息；6) The anti-noise mobile digital broadcast signal transmitter uses the training sequence as the real part sequence of the complex training sequence, and uses the service index sequence set by the service index sequence setting unit as the imaginary part sequence of the complex training sequence to form a complex training sequence in the time domain The discrete sample value blocks of the sequence, the length of the discrete sample value blocks of the training sequence, the service index sequence, and the complex training sequence are all X, and the service index sequence contains and uniquely expresses the system parameters and parameters of the anti-noise mobile digital broadcasting signal transmitter business model information;7)抗噪声移动数字广播信号发射机将在时域上构成的复数训练序列的离散样值块在时域上连续重复4次形成时域嵌入训练序列离散样值块，时域嵌入训练序列离散样值块的长度与降峰均功率比时域离散编码数据样值块的长度在数值上相等，即K＝4×X；7) The anti-noise mobile digital broadcast signal transmitter repeats the discrete sample blocks of the complex training sequence formed in the time domain for 4 consecutive times in the time domain to form a time domain embedded training sequence discrete sample block, and the time domain embedded training sequence is discrete The length of the sample value block is numerically equal to the length of the time-domain discretely encoded data sample block with reduced peak-to-average power ratio, that is, K=4×X;8)抗噪声移动数字广播信号发射机将降峰均功率比时域离散编码数据样值块、时域嵌入训练序列离散样值块直接叠加形成时域嵌入训练序列降峰均功率比时域离散编码数据样值块，作为帧体；8) The anti-noise mobile digital broadcasting signal transmitter directly superposes the time-domain discrete coded data sample block with reduced peak-to-average power ratio and the discrete sample value block of the time-domain embedded training sequence to form a time-domain embedded training sequence with reduced peak-to-average power ratio time-domain discrete coded data sample blocks as frame bodies;9)抗噪声移动数字广播信号发射机将循环前缀作为保护间隔即帧头插入时域嵌入训练序列降峰均功率比时域离散编码数据样值块即帧体，以形成信号帧，循环前缀的长度为C；9) The anti-noise mobile digital broadcasting signal transmitter uses the cyclic prefix as a guard interval, that is, the frame header is inserted into the time domain embedding training sequence to reduce the peak-to-average power ratio, and the time domain discretely encoded data sample block is the frame body to form a signal frame, and the cyclic prefix length is C;10)抗噪声移动数字广播信号发射机采用平方根升余弦滚降滤波器对信号帧的信号脉冲成形；10) The anti-noise mobile digital broadcast signal transmitter adopts the square root raised cosine roll-off filter to shape the signal pulse of the signal frame;11)抗噪声移动数字广播信号发射机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；11) The anti-noise mobile digital broadcasting signal transmitter up-converts the baseband signal to the carrier to form a radio frequency signal and transmits it to the wireless channel in the air;12)抗噪声移动数字广播信号接收机检测接收抗噪声移动数字广播信号发射机所发送的射频信号并将其下变频形成基带信号，利用信号帧的循环前缀特性和信号帧的结构特性进行基带信号接收处理。12) The anti-noise mobile digital broadcast signal receiver detects and receives the radio frequency signal sent by the anti-noise mobile digital broadcast signal transmitter and down-converts it to form a baseband signal, and uses the cyclic prefix characteristics of the signal frame and the structural characteristics of the signal frame to perform baseband signal Receive processing.2.按权利要求1的抗噪声移动数字广播信号传输方法，其特征在于：所述抗噪声移动数字广播信号发射机的训练序列、业务指标序列、复数训练序列的离散样值块的长度X取512、1024、2048中的一个。2. by the anti-noise mobile digital broadcast signal transmission method of claim 1, it is characterized in that: the length X of the discrete sample value block of the training sequence of described anti-noise mobile digital broadcast signal transmitter, service index sequence, complex number training sequence is taken One of 512, 1024, 2048.3.按权利要求2的抗噪声移动数字广播信号传输方法，其特征在于：所述训练序列、业务指标序列由一系列的1或-1组成，具有伪随机特性；所述训练序列、业务指标序列相互之间具有正交性。3. by the anti-noise mobile digital broadcasting signal transmission method of claim 2, it is characterized in that: described training sequence, service index sequence are made up of a series of 1 or-1, have pseudo-random characteristic; Described training sequence, service index The sequences are orthogonal to each other.4.按权利要求1的抗噪声移动数字广播信号传输方法，其特征在于：所述FFT数据块由子载波组成；当X取512时，子载波数取2048，子载波的频率间隔取4KHz；当X取1024时，子载波数取4096，子载波的频率间隔取2KHz；当X取2048时，子载波数取8192，子载波的频率间隔取1KHz。4. by the anti-noise mobile digital broadcasting signal transmission method of claim 1, it is characterized in that: described FFT data block is made up of subcarrier; When X gets 512, subcarrier number gets 2048, and the frequency interval of subcarrier gets 4KHz; When X is 1024, the number of subcarriers is 4096, and the frequency interval of subcarriers is 2KHz; when X is 2048, the number of subcarriers is 8192, and the frequency interval of subcarriers is 1KHz.5.按权利要求1的抗噪声移动数字广播信号传输方法，其特征在于：所述循环前缀的长度C取值与X取值有关；当X取512时，C取K大小的1/4；当X取1024时，C取K大小的1/8；当X取2048时，C取K大小的1/16。5. by the anti-noise mobile digital broadcasting signal transmission method of claim 1, it is characterized in that: the length C value of the cyclic prefix is related to the X value; when X is 512, C is 1/4 of the K size; When X takes 1024, C takes 1/8 of the size of K; when X takes 2048, C takes 1/16 of the size of K.6.按权利要求1的抗噪声移动数字广播信号传输方法，其特征在于：所述对输入数据进行LDPC编码的编码率为1/4、1/2、5/8、3/4和7/8中的一个。6. by the anti-noise mobile digital broadcasting signal transmission method of claim 1, it is characterized in that: described input data is carried out the encoding rate of LDPC encoding 1/4, 1/2, 5/8, 3/4 and 7/ One of 8.7.按权利要求1的抗噪声移动数字广播信号传输方法，其特征在于：所述抗噪声移动数字广播信号接收机所进行的基带信号接收处理，其中的一个步骤为信号帧头与信号帧体的时频域联合迭代分离处理。7. by the anti-noise mobile digital broadcasting signal transmission method of claim 1, it is characterized in that: the baseband signal receiving process that described anti-noise mobile digital broadcasting signal receiver carries out, one of the steps is signal frame header and signal frame body The time-frequency domain joint iterative separation process.

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