CN102299889B - Multimedia broadcasting single frequency network signal framing modulation method - Google Patents

Abstract

Translated fromChinese

本发明公开了一种多媒体广播单频网无线信号成帧调制方法，是一种时域频域空域混合的成帧调制方案。本发明的多媒体广播单频网无线信号成帧调制方法，具有低峰均功率比、同步时间短、抗信道衰落、可控多业务等优点。

The invention discloses a wireless signal framing modulation method of a multimedia broadcasting single frequency network, which is a framing modulation scheme of mixing time domain, frequency domain and space domain. The wireless signal framing modulation method of the multimedia broadcast single frequency network of the invention has the advantages of low peak-to-average power ratio, short synchronization time, anti-channel fading, controllable multi-service and the like.

Description

Translated fromChinese

一种多媒体广播单频网无线信号成帧调制方法A framing modulation method for wireless signal of multimedia broadcasting single frequency network

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单频网无线信号成帧调制方法。The invention belongs to the field of wireless communication, and more specifically relates to a method for framing and modulating a wireless signal of a multimedia broadcasting single frequency network.

背景技术Background technique

数字电视多媒体广播无线传输系统，作为数字电视无线多媒体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。数字电视无线多媒体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。在数字电视无线多媒体广播相关技术上，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无线多媒体广播提供低成本的可靠高速移动的实现方案。多媒体广播无线信号发射机成帧调制技术是数字电视无线多媒体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。Digital TV multimedia broadcasting wireless transmission system, as an important part of digital TV wireless multimedia 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 wireless multimedia 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 wireless multimedia broadcasting, countries are currently focusing on how to provide low-cost, reliable and high-speed mobile solutions for digital TV wireless multimedia broadcasting in a complex wave propagation environment. The framing modulation technology of the wireless signal transmitter of multimedia broadcasting is the key technology of the digital TV wireless multimedia broadcasting 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、宽带无线局域网、数字电视无线多媒体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 wireless multimedia broadcasting.

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.

采用单频网的组网模式(即，若干个发射台同一时间在同一个频率上发射同样的信号以实现对一定服务区域的可靠覆盖)可以大大提高数字电视多媒体广播无线传输系统的频谱利用率。在实际单频网通信环境中，数字电视多媒体广播无线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。多媒体广播单频网无线信号发射机成帧调制方法是实现可靠数字电视多媒体广播单频网无线传输的关键技术。The networking mode of single frequency network (that is, several transmitting stations transmit the same signal on the same frequency at the same time to achieve reliable coverage of a certain service area) can greatly improve the spectrum utilization of the digital TV multimedia broadcasting wireless transmission system . In the actual SFN communication environment, the performance of the digital TV multimedia broadcasting wireless communication system is affected by factors such as synchronization time, clock jitter, channel fading, and channel interference. The framing modulation method of the wireless signal transmitter of the multimedia broadcasting single frequency network is the key technology to realize the wireless transmission of the reliable digital television multimedia broadcasting single frequency network.

利用数字电视多媒体广播单频网无线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多媒体广播无线传输系统满足社会需求的体现。Using the digital TV multimedia broadcasting single frequency network wireless transmission system to provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, and multimedia value-added services is the embodiment of the new generation of digital TV multimedia broadcasting wireless 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多媒体广播单频网无线信号成帧调制方法，可以满足高数据率可控制多业务数字电视多媒体广播单频网无线传输的需要。Based on the above background, the present invention proposes a MBSFN wireless signal framing modulation method for the actual communication environment, which can meet the needs of high data rate controllable multi-service digital TV MBSFN wireless 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 broadcasttechnology for stationary portable and mobile use，”Proceedings of the IEEE，Special Issue 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, .2006.

M.Takada and M.Saito.“Transmission systems for ISDB-T，”Proceedingsof the IEEE，Special Issue on Global Digital Television：Technology andEmerging Services，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.

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多媒体广播单频网无线传输问题，提出了一种多媒体广播单频网无线信号成帧调制方法。Aiming at the problem of high data rate controllable multi-service digital television multimedia broadcasting single frequency network wireless transmission problem, the invention proposes a multimedia broadcasting single frequency network wireless signal framing modulation method.

本发明提出的一种多媒体广播单频网无线信号成帧调制方法，其特征在于它包括下列步骤：A kind of multimedia broadcasting single frequency network wireless signal framing modulation method that the present invention proposes is characterized in that it comprises the following steps:

1)单频网的网络数据管理器将输入数据比特流在频域上形成FFT数据块，FFT表示快速离散傅立叶变换，FFT数据块的长度为K；1) The network data manager of the single frequency network forms an FFT data block on the frequency domain with the input data bit stream, and FFT represents fast discrete Fourier transform, and the length of the FFT data block is K;

2)单频网的网络数据管理器采用码率为1的空频编码器将在频域上形成的FFT数据块调制至单频网中的各个多媒体广播无线信号发射机支路上形成空频调制FFT数据块，并调整各个多媒体广播无线信号发射机支路的时间同步以保证网络中的所有发射机都在同一时间对空频调制FFT数据块进行处理；2) The network data manager of the single frequency network uses a space frequency encoder with a code rate of 1 to modulate the FFT data block formed in the frequency domain to each multimedia broadcast wireless signal transmitter branch in the single frequency network to form space frequency modulation FFT data blocks, and adjust the time synchronization of each multimedia broadcast wireless signal transmitter branch to ensure that all transmitters in the network process the space-frequency modulation FFT data blocks at the same time;

3)单频网中的各个多媒体广播无线信号发射机采用IFFT将空频调制FFT数据块变换为空频调制时域离散数据样值块D_total，IFFT表示快速离散傅立叶反变换；3) Each multimedia broadcast wireless signal transmitter in the single frequency network adopts IFFT to transform the space-frequency modulation FFT data block into a space-frequency modulation time-domain discrete data sample block D_total , and IFFT represents an inverse fast discrete Fourier transform;

4)单频网中的各个多媒体广播无线信号发射机按顺序将空频调制时域离散数据样值块平分成两块，空频调制时域离散数据样值子块D₁和空频调制时域离散数据样值子块D₂，D_total＝[D₁，D₂]；4) Each multimedia broadcast wireless signal transmitter in the SFN divides the discrete data sample block in the space-frequency modulation time domain into two equally in sequence, the discrete data sample sub-block D1 in the space-frequency modulation time domain and the time-domain discrete data sample block_D1 in the space-frequency modulation Domain discrete data sample sub-block D₂ , D_total =[D₁ , D₂ ];

5)单频网中的各个多媒体广播无线信号发射机通过峰均功率比调整单元对空频调制时域离散数据样值子块D₁、空频调制时域离散数据样值子块D₂进行信号加、减、共轭运算处理并重新合成新的空频调制时域离散数据样值块D_new，新的空频调制时域离散数据样值块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种生成模式合成的空频调制时域离散数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比空频调制时域离散数据样值块

并将降峰均功率比空频调制时域离散数据样值块

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表示对空频调制时域离散数据样值子块D₁的各空频调制时域离散数据样值进行共轭运算处理而得到的空频调制时域离散数据样值子块；5) Each multimedia broadcasting wireless signal transmitter in the single frequency network uses the peak-to-average power ratio adjustment unit to perform the time-domain discrete data sample sub-block D₁ of the space-frequency modulation and the discrete data sample sub-block D₂ of the space-frequency modulation time domain. Signal addition, subtraction, and conjugate operation processing and re-synthesis of a new space-frequency modulation time-domain discrete data sample block_Dnew , the new space-frequency modulation time-domain discrete data sample block_Dnew is obtained using the following generation mode, generation mode 1 For D_new = [D₁ , D₂ ], the generation mode 2 is${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ 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 space-frequency modulation time-domain discrete data sample block D_new synthesized by 12 generation modes, and select the space-frequency modulation time-domain discrete data sample block with the lowest peak-to-average power ratio among them

and reduce the peak-to-average power ratio to space-frequency modulation time-domain discrete data sample blocks

The corresponding generated mode information is sent to the service index sequence setting unit, wherein, D^*₁ means that the conjugate operation is performed on each space-frequency modulation time-domain discrete data sample value of the space-frequency modulation time-domain discrete data sample sub-block D₁ The processed space-frequency modulated time-domain discrete data sample sub-blocks;

6)单频网中的各个多媒体广播无线信号发射机将循环前缀作为保护间隔插入降峰均功率比空频调制时域离散数据样值块，形成降峰均功率比空频调制时域循环前缀离散数据样值块，作为帧体，循环前缀的长度为C，降峰均功率比空频调制时域循环前缀离散数据样值块的长度为C+K；6) Each multimedia broadcast wireless signal transmitter in the single frequency network inserts the cyclic prefix as a guard interval into the discrete data sample block in the space-frequency modulation time domain with reduced peak-to-average power ratio to form a cyclic prefix with reduced peak-to-average power ratio space-frequency modulation time domain The discrete data sample block is used as the frame body, the length of the cyclic prefix is C, and the length of the discrete data sample block of the reduced peak-to-average power ratio space-frequency modulation time-domain cyclic prefix is C+K;

7)单频网中的各个多媒体广播无线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多媒体广播无线信号发射机的各系统参数和业务模式信息；7) Each multimedia broadcast wireless signal transmitter in the single frequency network 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 blocks that constitute the complex training sequence, the length of the training sequence, the service index sequence, and the discrete sample block of the complex training sequence are all X, and the service index sequence contains and uniquely expresses each system of the multimedia broadcast wireless signal transmitter parameter and business model information;

8)单频网中的各个多媒体广播无线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2次形成时域重复训练序列离散样值块，作为帧头；8) Each multimedia broadcast wireless signal transmitter in the single frequency network repeats the discrete sample value blocks of the complex training sequence formed in the time domain continuously twice in the time domain to form the discrete sample value blocks of the repeated training sequence in the time domain, as a frame head;

9)单频网中的各个多媒体广播无线信号发射机将时域重复训练序列离散样值块即帧头插入到降峰均功率比空频调制时域循环前缀离散数据样值块即帧体，以形成信号帧；9) Each multimedia broadcast wireless signal transmitter in the single frequency network inserts the discrete sample value block of the time-domain repeated training sequence, that is, the frame header, into the discrete data sample value block of the time-domain cyclic prefix of the reduced peak-to-average power ratio space-frequency modulation, that is, the frame body, to form a signal frame;

10)单频网中的各个多媒体广播无线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) Each multimedia broadcast wireless signal transmitter in the single frequency network adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

11)单频网中的各个多媒体广播无线信号发射机将基带信号上变频至载波上。11) Each multimedia broadcast wireless signal transmitter in the single frequency network up-converts the baseband signal to the carrier.

按照上述的多媒体广播单频网无线信号成帧调制方法，其特征在于：单频网中的各个多媒体广播无线信号发射机的降峰均功率比空频调制时域离散数据样值块由空频调制时域离散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；单频网中的各个多媒体广播无线信号发射机的信号帧中具有周期性的时域重复训练序列离散样值块；单频网中的各个多媒体广播无线信号发射机的训练序列的长度X为512、1024、2048中的一个，相对应的空频调制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分别为空频调制FFT数据块长度K大小的1/4、1/8、1/16；单频网中的各个多媒体广播无线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；单频网中的各个多媒体广播无线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；单频网中的各个多媒体广播无线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单频网中的各个多媒体广播无线信号发射机的各系统参数和业务模式信息；空频编码器的码率为1。According to the above-mentioned wireless signal framing modulation method for multimedia broadcasting single frequency network, it is characterized in that: the peak-to-average power ratio of each multimedia broadcasting wireless signal transmitter in the single frequency network is reduced by space frequency modulation time domain discrete data sample value block Modulated time-domain discrete data sample sub-blocks are re-synthesized through signal addition, subtraction, and conjugate operation processing for 12 specific generation modes; the signal frames of each multimedia broadcast wireless signal transmitter in the single frequency network have periodicity The time-domain repeated training sequence discrete sample block; the length X of the training sequence of each multimedia broadcast wireless signal transmitter in the single frequency network is one of 512, 1024, 2048, and the length of the corresponding space-frequency modulation FFT data block K is 2048, 4096, 8192 respectively, the frequency intervals of the corresponding subcarriers are 4KHz, 2KHz, 1KHz respectively, and the corresponding cyclic prefix length C is 1/4, 1/3 of the length K of the space-frequency modulation FFT data block. 8. 1/16; the training sequence and service index sequence of each multimedia broadcast wireless signal transmitter in the single frequency network are composed of a series of 1 or -1, which have pseudo-random characteristics; each multimedia broadcast wireless signal in the single frequency network The training sequence and service index sequence of the transmitter are orthogonal to each other; each different service index sequence of each multimedia broadcast wireless signal transmitter in the single frequency network contains and uniquely expresses each multimedia broadcast in the single frequency network Various system parameters and service mode information of the wireless signal transmitter; the code rate of the space frequency coder is 1.

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

本发明是一种时域频域空域混合的成帧调制方案。本发明的降峰均功率比空频调制时域离散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空频调制时域离散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。单频网中的各个多媒体广播无线信号发射机的信号帧中具有周期性的时域重复训练序列离散样值块，单频网中的各个多媒体广播无线信号发射机的训练序列、业务指标序列具有伪随机特性，单频网中的各个多媒体广播无线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，单频网中的各个多媒体广播无线信号发射机的信号帧由时域重复训练序列离散样值块即帧头插入到降峰均功率比空频调制时域循环前缀离散数据样值块即帧体而形成，这些保证了多媒体广播无线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降峰均功率比空频调制时域离散数据样值块以形成信号帧体，可以减少信号帧头与帧体数据之间的干扰影响。单频网中的各个多媒体广播无线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单频网中的各个多媒体广播无线信号发射机的各系统参数和业务模式信息，可以使得数字电视多媒体广播单频网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。本发明的成帧调制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多媒体广播单频网无线传输等诸多优点。The invention is a framing modulation scheme of mixing time domain, frequency domain and space domain. The generation mode of the time-domain discrete data sample block with reduced peak-to-average power ratio and space-frequency modulation of the present invention and the method for selecting the time-domain discrete data sample block with reduced peak-to-average power ratio with the lowest peak-to-average power ratio can not only fully The maximum peak power of OFDM signal 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 adopted generation mode requires a small amount of additional information to be sent, and is easy to process and recover the original signal of the OFDM signal at the receiver without destroying the orthogonality characteristic of the subcarrier signal and generating additional non-linear distortion. The signal frame of each multimedia broadcast wireless signal transmitter in the single frequency network has a periodic time-domain repeated training sequence discrete sample block, and the training sequence and service index sequence of each multimedia broadcast wireless signal transmitter in the single frequency network have Pseudo-random characteristics, the training sequence and service index sequence of each multimedia broadcast wireless signal transmitter in the single frequency network are orthogonal to each other, and the signal frames of each multimedia broadcast wireless signal transmitter in the single frequency network are repeated by the time domain The discrete sample block of the training sequence, that is, the frame header, is inserted into the time-domain cyclic prefix of the reduced peak-to-average power ratio, and the discrete data sample block, that is, the frame body, is formed, which ensures that the multimedia broadcast wireless signal receiver can achieve fast and accurate frame synchronization , frequency synchronization, time synchronization, estimation of channel transmission characteristics, and reliable tracking of phase noise and channel transmission characteristics. Inserting the cyclic prefix as a guard interval into the discrete data sample blocks in the space-frequency modulation time domain with reduced peak-to-average power ratio to form a signal frame body can reduce the interference effect between the signal frame header and the frame body data. Each different service index sequence of each multimedia broadcast wireless signal transmitter in the single frequency network contains and uniquely expresses each system parameter and service mode information of each multimedia broadcast wireless signal transmitter in the single frequency network, which can make digital TV The wireless transmission system of multimedia broadcasting single frequency network can provide controllable multi-services such as free TV broadcasting, paid TV broadcasting, confidential information transmission, multimedia value-added services, etc., to meet social needs. The framing modulation method of the present invention has the advantages of low peak-to-average power ratio, short synchronization time, small clock jitter, anti-channel fading, anti-channel interference, and can provide high data rate, controllable multi-service digital TV multimedia broadcast single frequency network wireless transmission, etc. advantage.

附图说明Description of drawings

图1是按照本发明的多媒体广播单频网无线信号成帧调制方法的单频网发射机的实施例示意图。Fig. 1 is a schematic diagram of an embodiment of a single frequency network transmitter according to a method for framing and modulating a wireless signal of a multimedia broadcasting single frequency network of the present invention.

图2是按照本发明的多媒体广播单频网无线信号成帧调制方法的单频网发射机信号成帧调制的实施例示意图。Fig. 2 is a schematic diagram of an embodiment of signal framing modulation of a single frequency network transmitter according to a method for framing modulation of a wireless signal in a multimedia broadcasting single frequency network 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单频网无线信号成帧调制方法的单频网发射机的实施例，如图1所示，按下列步骤进行：According to the embodiment of the single frequency network transmitter of the multimedia broadcasting single frequency network wireless signal framing modulation method proposed by the present invention, as shown in Figure 1, carry out according to the following steps:

1)单频网的网络数据管理器将输入数据比特流在频域上形成FFT数据块，FFT表示快速离散傅立叶变换，FFT数据块的长度为K；1) The network data manager of the single frequency network forms an FFT data block on the frequency domain with the input data bit stream, and FFT represents fast discrete Fourier transform, and the length of the FFT data block is K;

2)单频网的网络数据管理器采用码率为1的空频编码器将在频域上形成的FFT数据块调制至单频网中的各个多媒体广播无线信号发射机支路上形成空频调制FFT数据块，并调整各个多媒体广播无线信号发射机支路的时间同步以保证网络中的所有发射机都在同一时间对空频调制FFT数据块进行处理；2) The network data manager of the single frequency network uses a space frequency encoder with a code rate of 1 to modulate the FFT data block formed in the frequency domain to each multimedia broadcast wireless signal transmitter branch in the single frequency network to form space frequency modulation FFT data blocks, and adjust the time synchronization of each multimedia broadcast wireless signal transmitter branch to ensure that all transmitters in the network process the space-frequency modulation FFT data blocks at the same time;

3)单频网中的各个多媒体广播无线信号发射机采用IFFT将空频调制FFT数据块变换为空频调制时域离散数据样值块D_total，IFFT表示快速离散傅立叶反变换；3) Each multimedia broadcast wireless signal transmitter in the single frequency network adopts IFFT to transform the space-frequency modulation FFT data block into a space-frequency modulation time-domain discrete data sample block D_total , and IFFT represents an inverse fast discrete Fourier transform;

4)单频网中的各个多媒体广播无线信号发射机按顺序将空频调制时域离散数据样值块平分成两块，空频调制时域离散数据样值子块D₁和空频调制时域离散数据样值子块D₂，D_total＝[D₁，D₂]；4) Each multimedia broadcast wireless signal transmitter in the SFN divides the discrete data sample block in the space-frequency modulation time domain into two equally in sequence, the discrete data sample sub-block D1 in the space-frequency modulation time domain and the time-domain discrete data sample block_D1 in the space-frequency modulation Domain discrete data sample sub-block D₂ , D_total =[D₁ , D₂ ];

5)单频网中的各个多媒体广播无线信号发射机通过峰均功率比调整单元对空频调制时域离散数据样值子块D₁、空频调制时域离散数据样值子块D₂进行信号加、减、共轭运算处理并重新合成新的空频调制时域离散数据样值块D_new，新的空频调制时域离散数据样值块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种生成模式合成的空频调制时域离散数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比空频调制时域离散数据样值块

并将降峰均功率比空频调制时域离散数据样值块

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表示对空频调制时域离散数据样值子块D₁的各空频调制时域离散数据样值进行共轭运算处理而得到的空频调制时域离散数据样值子块；5) Each multimedia broadcasting wireless signal transmitter in the single frequency network uses the peak-to-average power ratio adjustment unit to perform the time-domain discrete data sample sub-block D₁ of the space-frequency modulation and the discrete data sample sub-block D₂ of the space-frequency modulation time domain. Signal addition, subtraction, and conjugate operation processing and re-synthesis of a new space-frequency modulation time-domain discrete data sample block_Dnew , the new space-frequency modulation time-domain discrete data sample block_Dnew is obtained using the following generation mode, generation mode 1 For D_new = [D₁ , D₂ ], the generation mode 2 is${\mathrm{D.}}_{\mathrm{new}}=[{\mathrm{D.}}_1,\sqrt{1/2}({\mathrm{D.}}_1+{\mathrm{D.}}_2)],$ 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 space-frequency modulation time-domain discrete data sample block_Dnew synthesized by 12 generation modes, and select the space-frequency modulation time-domain discrete data sample block with the lowest peak-to-average power ratio among them

and reduce the peak-to-average power ratio to space-frequency modulation time-domain discrete data sample blocks

The corresponding generated mode information is sent to the service index sequence setting unit, wherein, D^*₁ means that the conjugate operation is performed on each space-frequency modulation time-domain discrete data sample value of the space-frequency modulation time-domain discrete data sample sub-block D₁ The processed space-frequency modulated time-domain discrete data sample sub-blocks;

6)单频网中的各个多媒体广播无线信号发射机将循环前缀作为保护间隔插入降峰均功率比空频调制时域离散数据样值块，形成降峰均功率比空频调制时域循环前缀离散数据样值块，作为帧体，循环前缀的长度为C，降峰均功率比空频调制时域循环前缀离散数据样值块的长度为C+K；6) Each multimedia broadcast wireless signal transmitter in the single frequency network inserts the cyclic prefix as a guard interval into the discrete data sample block in the space-frequency modulation time domain with reduced peak-to-average power ratio to form a cyclic prefix with reduced peak-to-average power ratio space-frequency modulation time domain The discrete data sample block is used as the frame body, the length of the cyclic prefix is C, and the length of the discrete data sample block of the reduced peak-to-average power ratio space-frequency modulation time-domain cyclic prefix is C+K;

7)单频网中的各个多媒体广播无线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多媒体广播无线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；当X取512时，K取2048，C取K大小的1/4，空频调制FFT数据块子载波的频率间隔取4KHz；当X取1024时，K取4096，C取K大小的1/8，空频调制FFT数据块子载波的频率间隔取2KHz；当X取2048时，K取8192，C取K大小的1/16，空频调制FFT数据块子载波的频率间隔取1KHz；7) Each multimedia broadcast wireless signal transmitter in the single frequency network 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 blocks that constitute the complex training sequence, the length of the training sequence, the service index sequence, and the discrete sample block of the complex training sequence are all X, and the service index sequence contains and uniquely expresses each system of the multimedia broadcast wireless signal transmitter Parameters and business mode information; X takes one of 512, 1024, and 2048; when X takes 512, K takes 2048, C takes 1/4 of the size of K, and the frequency interval of the subcarriers of the space-frequency modulation FFT data block takes 4KHz; When X is 1024, K is 4096, C is 1/8 of the size of K, and the frequency interval of the FFT data block subcarrier is 2KHz; when X is 2048, K is 8192, and C is 1/8 of the size of K 16. The frequency interval of the subcarriers of the space-frequency modulation FFT data block is 1KHz;

8)单频网中的各个多媒体广播无线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2次形成时域重复训练序列离散样值块，作为帧头；8) Each multimedia broadcast wireless signal transmitter in the single frequency network repeats the discrete sample value blocks of the complex training sequence formed in the time domain continuously twice in the time domain to form the discrete sample value blocks of the repeated training sequence in the time domain, as a frame head;

9)单频网中的各个多媒体广播无线信号发射机将时域重复训练序列离散样值块即帧头插入到降峰均功率比空频调制时域循环前缀离散数据样值块即帧体，以形成信号帧；9) Each multimedia broadcast wireless signal transmitter in the single frequency network inserts the discrete sample value block of the time-domain repeated training sequence, that is, the frame header, into the discrete data sample value block of the time-domain cyclic prefix of the reduced peak-to-average power ratio space-frequency modulation, that is, the frame body, to form a signal frame;

10)单频网中的各个多媒体广播无线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) Each multimedia broadcast wireless signal transmitter in the single frequency network adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;

11)单频网中的各个多媒体广播无线信号发射机将基带信号上变频至载波上。11) Each multimedia broadcast wireless signal transmitter in the single frequency network up-converts the baseband signal to the carrier.

按照本发明的多媒体广播单频网无线信号成帧调制方法的单频网发射机信号成帧调制的实施例，如图2所示，具体实施如下：According to the embodiment of the single frequency network transmitter signal framing modulation of the multimedia broadcast single frequency network wireless signal framing modulation method of the present invention, as shown in Figure 2, the specific implementation is as follows:

单频网的网络数据管理器将输入数据比特流在频域上形成FFT数据块；采用码率为1的空频编码器将在频域上形成的FFT数据块调制至单频网中的各个多媒体广播无线信号发射机支路上形成空频调制FFT数据块，并调整各个多媒体广播无线信号发射机支路的时间同步以保证网络中的所有发射机都在同一时间对空频调制FFT数据块进行处理；再经IFFT将其变换为空频调制时域离散数据样值块，通过峰均功率比调整单元生成并选取其中具有最低峰均功率比的降峰均功率比空频调制时域离散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。The network data manager of the single frequency network forms an FFT data block in the frequency domain from the input data bit stream; a space-frequency coder with a code rate of 1 is used to modulate the FFT data block formed in the frequency domain to each Form the space-frequency modulation FFT data block on the branch of the multimedia broadcasting wireless signal transmitter, and adjust the time synchronization of each multimedia broadcasting wireless signal transmitter branch to ensure that all transmitters in the network perform the space-frequency modulation FFT data block at the same time Processing; then transform it into space-frequency modulation time-domain discrete data sample blocks through IFFT, and generate and select the peak-to-average power ratio space-frequency modulation time-domain discrete data with the lowest peak-to-average power ratio through the peak-to-average power ratio adjustment unit At the same time, the sample value block sends the corresponding generated mode information to the service index sequence setting unit.

单频网中的各个多媒体广播无线信号发射机将循环前缀作为保护间隔插入降峰均功率比时域离散数据样值块，形成降峰均功率比时域循环前缀离散数据样值块，作为帧体，循环前缀的长度为C。Each multimedia broadcast wireless signal transmitter in the single frequency network inserts the cyclic prefix as a guard interval into the time-domain discrete data sample block of the reduced peak-to-average power ratio to form a discrete data sample block of the reduced peak-to-average power ratio time-domain cyclic prefix, which is used as a frame Body, the length of the cyclic prefix is C.

单频网中的各个多媒体广播无线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多媒体广播无线信号发射机的各系统参数和业务模式信息。Each multimedia broadcast wireless signal transmitter in the single frequency network 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 sequence in the time domain The discrete sample value block of the complex training sequence, the length of the discrete sample value block of the training sequence, the service index sequence, and the complex number training sequence is X, and the service index sequence contains and uniquely expresses the system parameters of the multimedia broadcast wireless signal transmitter and Business model information.

单频网中的各个多媒体广播无线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2次形成时域重复训练序列离散样值块，作为帧头。Each multimedia broadcast wireless signal transmitter in the single frequency network repeats the discrete sample blocks of the complex training sequence formed in the time domain twice continuously in the time domain to form the discrete sample blocks of the repeated training sequence in the time domain as frame headers.

单频网中的各个多媒体广播无线信号发射机将时域重复训练序列离散样值块即帧头插入到降峰均功率比时域循环前缀离散数据样值块即帧体，以形成信号帧。Each multimedia broadcasting wireless signal transmitter in the single frequency network inserts the time-domain repeated training sequence discrete sample block (frame header) into the peak-to-average power ratio time-domain cyclic prefix discrete data sample block (frame body) to form a signal frame.

单频网中的各个多媒体广播无线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。Each multimedia broadcast wireless signal transmitter in the single frequency network uses a square root raised cosine roll-off filter to shape the signal pulse of the signal frame.

单频网中的各个多媒体广播无线信号发射机将基带信号上变频至载波上。Each multimedia broadcast radio signal transmitter in the single frequency network up-converts the baseband signal to the carrier.

单频网中的各个多媒体广播无线信号发射机的X取512、1024、2048中的一个；当X取512时，K取2048，C取K大小的1/4，空频调制FFT数据块子载波的频率间隔取4KHz；当X取1024时，K取4096，C取K大小的1/8，空频调制FFT数据块子载波的频率间隔取2KHz；当X取2048时，K取8192，C取K大小的1/16，空频调制FFT数据块子载波的频率间隔取1KHz；作为单频网中的各个多媒体广播无线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单频网中的各个多媒体广播无线信号发射机的各系统参数和业务模式信息。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 X of each multimedia broadcast wireless signal transmitter in the single frequency network is one of 512, 1024, and 2048; when X is 512, K is 2048, and C is 1/4 of the size of K, and the space-frequency modulation FFT data block The frequency interval of the carrier is 4KHz; when X is 1024, K is 4096, C is 1/8 of the size of K, and the frequency interval of the subcarriers of the space-frequency modulation FFT data block is 2KHz; when X is 2048, K is 8192, C takes 1/16 of the size of K, and the frequency interval of the subcarriers of the space-frequency modulation FFT data block is 1KHz; as the training sequence and service index sequence of each multimedia broadcast wireless signal transmitter in the single frequency network, a series of 1 or - 1, with pseudo-random characteristics, the training sequence and the service index sequence are orthogonal to each other; the training sequence satisfying the above characteristics can be composed of a special type of pseudo-random number sequence and a set of shifted m-sequences as the orthogonal Walsh sequence, Hadamard sequence or orthogonal sequence generated by other methods. Each different service index sequence contains and uniquely expresses each system parameter and service mode information of each multimedia broadcast wireless signal transmitter in the single frequency network. 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.

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 (5)

Translated fromChinese

1.一种多媒体广播单频网无线信号成帧调制方法，其特征在于它包括下列步骤：1. A method for framing modulation of a multimedia broadcasting single frequency network wireless signal, is characterized in that it comprises the following steps:1)单频网的网络数据管理器将输入数据比特流在频域上形成FFT数据块，FFT数据块的长度为K；1) The network data manager of the single frequency network forms an FFT data block on the frequency domain with the input data bit stream, and the length of the FFT data block is K;2)单频网的网络数据管理器采用码率为1的空频编码器将在频域上形成的FFT数据块调制至单频网中的各个多媒体广播无线信号发射机支路上形成空频调制FFT数据块，并调整各个多媒体广播无线信号发射机支路的时间同步以保证网络中的所有发射机都在同一时间对空频调制FFT数据块进行处理；2) The network data manager of the single frequency network uses a space frequency encoder with a code rate of 1 to modulate the FFT data block formed in the frequency domain to each multimedia broadcast wireless signal transmitter branch in the single frequency network to form space frequency modulation FFT data blocks, and adjust the time synchronization of each multimedia broadcast wireless signal transmitter branch to ensure that all transmitters in the network process the space-frequency modulation FFT data blocks at the same time;3)单频网中的各个多媒体广播无线信号发射机采用IFFT将空频调制FFT数据块变换为空频调制时域离散数据样值块D_total；3) Each multimedia broadcast wireless signal transmitter in the single frequency network adopts IFFT to transform the space frequency modulation FFT data block into space frequency modulation time domain discrete data sample value block D_total ;4)单频网中的各个多媒体广播无线信号发射机按顺序将空频调制时域离散数据样值块平分成两块，空频调制时域离散数据样值子块D₁和空频调制时域离散数据样值子块D₂，D_total＝[D₁，D₂]；4) Each multimedia broadcast wireless signal transmitter in the SFN divides the discrete data sample block in the space-frequency modulation time domain into two equally in sequence, the discrete data sample sub-block D1 in the space-frequency modulation time domain and the time-domain discrete data sample block_D1 in the space-frequency modulation Domain discrete data sample sub-block D₂ , D_total =[D₁ , D₂ ];5)单频网中的各个多媒体广播无线信号发射机通过峰均功率比调整单元对空频调制时域离散数据样值子块D₁、空频调制时域离散数据样值子块D₂进行信号加、减、共轭运算处理并重新合成新的空频调制时域离散数据样值块D_new，新的空频调制时域离散数据样值块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

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

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

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种生成模式合成的空频调制时域离散数据样值块D_new，选取其中具有最低峰均功率比的降峰均功率比空频调制时域离散数据样值块

并将降峰均功率比空频调制时域离散数据样值块

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表示对空频调制时域离散数据样值子块D₁的各空频调制时域离散数据样值进行共轭运算处理而得到的空频调制时域离散数据样值子块；5) Each multimedia broadcasting wireless signal transmitter in the single frequency network uses the peak-to-average power ratio adjustment unit to perform the time-domain discrete data sample sub-block D₁ of the space-frequency modulation and the discrete data sample sub-block D₂ of the space-frequency modulation time domain. Signal addition, subtraction, and conjugate operation processing and re-synthesis of a new space-frequency modulation time-domain discrete data sample block_Dnew , the new space-frequency modulation time-domain discrete data sample block_Dnew is obtained using the following generation mode, generation mode 1 For D_new = [D₁ , D₂ ], the generation mode 2 is

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

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 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

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 space-frequency modulation time-domain discrete data sample block D_new synthesized by 12 generation modes, and select the space-frequency modulation time-domain discrete data sample block with the lowest peak-to-average power ratio among them

and reduce the peak-to-average power ratio to space-frequency modulation time-domain discrete data sample blocks

The corresponding generated mode information is sent to the service index sequence setting unit, wherein, D^*₁ means that the conjugate operation is performed on each space-frequency modulation time-domain discrete data sample value of the space-frequency modulation time-domain discrete data sample sub-block D₁ The processed space-frequency modulated time-domain discrete data sample sub-blocks;6)单频网中的各个多媒体广播无线信号发射机将循环前缀作为保护间隔插入降峰均功率比空频调制时域离散数据样值块，形成降峰均功率比空频调制时域循环前缀离散数据样值块，作为帧体，循环前缀的长度为C，降峰均功率比空频调制时域循环前缀离散数据样值块的长度为C+K；6) Each multimedia broadcast wireless signal transmitter in the single frequency network inserts the cyclic prefix as a guard interval into the discrete data sample block in the space-frequency modulation time domain with reduced peak-to-average power ratio to form a cyclic prefix with reduced peak-to-average power ratio space-frequency modulation time domain The discrete data sample block is used as the frame body, the length of the cyclic prefix is C, and the length of the discrete data sample block of the reduced peak-to-average power ratio space-frequency modulation time-domain cyclic prefix is C+K;7)单频网中的各个多媒体广播无线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多媒体广播无线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；当X取512时，K取2048，C取K大小的1/4；当X取1024时，K取4096，C取K大小的1/8；当X取2048时，K取8192，C取K大小的1/16；7) Each multimedia broadcast wireless signal transmitter in the single frequency network 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 blocks that constitute the complex training sequence, the length of the training sequence, the service index sequence, and the discrete sample block of the complex training sequence are all X, and the service index sequence contains and uniquely expresses each system of the multimedia broadcast wireless signal transmitter Parameters and business model information; X takes one of 512, 1024, and 2048; when X takes 512, K takes 2048, and C takes 1/4 of the size of K; when X takes 1024, K takes 4096, and C takes K size 1/8; when X is 2048, K is 8192, and C is 1/16 of K;8)单频网中的各个多媒体广播无线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2次形成时域重复训练序列离散样值块，作为帧头；8) Each multimedia broadcast wireless signal transmitter in the single frequency network repeats the discrete sample value blocks of the complex training sequence formed in the time domain continuously twice in the time domain to form the discrete sample value blocks of the repeated training sequence in the time domain, as a frame head;9)单频网中的各个多媒体广播无线信号发射机将时域重复训练序列离散样值块即帧头插入到降峰均功率比空频调制时域循环前缀离散数据样值块即帧体，以形成信号帧；9) Each multimedia broadcast wireless signal transmitter in the single frequency network inserts the discrete sample value block of the time-domain repeated training sequence, that is, the frame header, into the discrete data sample value block of the time-domain cyclic prefix of the reduced peak-to-average power ratio space-frequency modulation, that is, the frame body, to form a signal frame;10)单频网中的各个多媒体广播无线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) Each multimedia broadcast wireless signal transmitter in the single frequency network adopts a square root raised cosine roll-off filter to shape the signal pulse of the signal frame;11)单频网中的各个多媒体广播无线信号发射机将基带信号上变频至载波上。11) Each multimedia broadcast wireless signal transmitter in the single frequency network up-converts the baseband signal to the carrier.2.按权利要求1的多媒体广播单频网无线信号成帧调制方法，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。2. according to the framing modulation method of the wireless signal of multimedia broadcast single frequency network of claim 1, it is characterized in that: described training sequence, service index sequence are made up of a series of 1 or-1.3.按权利要求1的多媒体广播单频网无线信号成帧调制方法，其特征在于：所述训练序列、业务指标序列具有伪随机特性。3. according to the framing modulation method of the wireless signal of multimedia broadcast single frequency network of claim 1, it is characterized in that: described training sequence, service index sequence have pseudo-random characteristic.4.按权利要求1的多媒体广播单频网无线信号成帧调制方法，其特征在于：所述训练序列、业务指标序列相互之间具有正交性。4. The framing modulation method of the wireless signal of the multimedia broadcasting single frequency network according to claim 1, characterized in that: the training sequence and the service index sequence are mutually orthogonal.5.按权利要求1的多媒体广播单频网无线信号成帧调制方法，其特征在于：所述空频调制FFT数据块由子载波组成；当X取512时，子载波的频率间隔取4KHz；当X取1024时，子载波的频率间隔取2KHz；当X取2048时，子载波的频率间隔取1KHz。5. by the multimedia broadcasting single frequency network wireless signal framing modulation method of claim 1, it is characterized in that: said space-frequency modulation FFT data block is made up of subcarrier; When X gets 512, the frequency interval of subcarrier gets 4KHz; When X is 1024, the frequency interval of subcarriers is 2KHz; when X is 2048, the frequency interval of subcarriers is 1KHz.

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