CN100499630C - Digital information transmission method of a kind of multicarrier digital mobile multimedia broadcast system - Google Patents

Digital information transmission method of a kind of multicarrier digital mobile multimedia broadcast system Download PDF

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CN100499630C
CN100499630C CNB2006101139163A CN200610113916A CN100499630C CN 100499630 C CN100499630 C CN 100499630C CN B2006101139163 A CNB2006101139163 A CN B2006101139163A CN 200610113916 A CN200610113916 A CN 200610113916A CN 100499630 C CN100499630 C CN 100499630C
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information transmission
transmission method
digital information
data
code
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CN1960358A (en
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葛启宏
涛 陶
栋 白
宋挥师
梁毅斌
闫发军
王军伟
杨庆华
群 李
申红兵
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北京泰美世纪科技有限公司
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Abstract

本发明公开一种多载波数字多媒体移动广播的数字信息传输方法,通过对上层数据流依次进行RS编码和字节交织、LDPC编码、比特交织、星座映射后,将得到的数据符号与离散导频和包含有系统信息的连续导频复接在一起组成OFDM频域符号并进行扰码,经IFFT变换产生OFDM时域符号,经过插入帧头组成时隙后,连接组成物理层信号帧,对上述物理层信号帧进行低通滤波和正交上变频后发射。 The present invention discloses a method for transmitting digital information multicarrier digital multimedia mobile broadcasting, the data stream sequentially through the upper layer of RS-encoding and byte interleaving the LDPC coding, bit interleaving, constellation mapping after, the resulting data is scattered pilot symbols and the system comprises a continuous pilot pilot information multiplexed together to form the OFDM frequency domain symbols and scrambling to produce a time-domain OFDM symbols through the IFFT, is inserted through the slot header consisting of, connected to form a physical layer signal frame, the above-described physical layer signals after frame conversion transmitter and a quadrature low pass filtering. 该方法为移动式、固定式和便携式接收机提供高质量的音频、视频和多媒体数据等无线广播,可以使用卫星传输和地面传输得方式进行传输。 The method for mobile, fixed and portable radio receiver provides high-quality audio, video and multimedia data and the like, may be used to give the satellite transmission and terrestrial transmission mode for transmission. 该方法采用LDPC的正交频分复用方案,满足了低成本和高性能的要求。 The method employs LDPC orthogonal frequency division multiplexing scheme to meet the requirements of high performance and low cost.

Description

一种多栽波数字移动多媒体广播的数字信息传输方法 A multi-wave planted mobile digital information transmission method of digital multimedia broadcasting

技术领域 FIELD

本发明涉及数字信息传输技术领域,特别涉及数字多媒体广播的信息传输方法。 Technical Field The present invention relates to digital information transmission, in particular, it relates to an information transmission method for digital multimedia broadcasting.

背景技术 Background technique

无线通信广播除了覆盖面广、节目容量大之外,最大的特点就是具有广播性,一点对多点、一点对面,在低成本条件下具有较高传输带宽。 In addition to wireless communications and broadcasting coverage, a large-capacity program, the biggest feature is the broadcast of a point to multipoint, is the opposite, having a higher bandwidth at low cost. 因此,无线通信广播作为信息通信业的一个重要组成部分,在国家信息基础设施建设、实现普遍服务和国家信息安全战略中具有重要地位。 Therefore, the wireless communications and broadcasting as an important part of the information and communication industry, infrastructure construction in the national information infrastructure, achieve universal service and national information security strategy plays an important role. · 经过多年的研究和发展,数字无线广播已经取得了很多成果,达到了实用阶段,目前世界上主要有四种无线数字电视广播标准: · After years of research and development, digital radio broadcasting has achieved a lot, reached a practical stage, at present there are four wireless digital TV broadcast standards in the world:

I )数字视频广播(Digital Video Broadcasting,即DVB )系列标准 I) Digital Video Broadcasting (Digital Video Broadcasting, namely DVB) standard series

DVB 是由欧洲通信标准组织(European Telecommunications StandardsInstitute,即ETSI )提出的。 DVB is proposed by the European Telecommunications Standards Organization (European Telecommunications StandardsInstitute, namely ETSI) is. 欧洲在1993年停止了数模混合制式电视系统的研究后,开始了数字电视广播系统的研究,并先后颁布了数字视频卫星广播(Digital Video Broadcasting-Satel I ite,即DVB-S )、数字视频有线广播(Digital Video Broadcasting-Cable,即DVB-C )、数字视频地面广播(Digital Video Broadcasting- Terrestrial,即DVB-T )标准和以DVB-T为基础发展出来的数字电视手持广播(Digital VideoBroadcasting- Handheld,即DVB-H )标准。 After the European ceased analog hybrid standard television system in 1993, he began a study of digital television broadcasting system, and has issued a digital video satellite broadcasting (Digital Video Broadcasting-Satel I ite, namely DVB-S), digital video cable broadcasting (digital video broadcasting-cable, namely DVB-C), digital video broadcast-terrestrial (digital video Broadcasting- terrestrial, ie DVB-T) standard to DVB-T and developed based on a handheld digital TV broadcasting (digital VideoBroadcasting- Handheld, i.e., DVB-H) standard. 上述标准中的DVB-S标准采用单载波QPSK调制方式,采用级联的卷积码与RS码、作为信道编码、采用伪随机比特序列(Pseudo Random BitSequence,即PRBS )进行扰码,使用无线卫星链路,仅适用于固定接收系统,不适用于移动终端设备。 The above criteria DVB-S standard utilizes single carrier modulation scheme QPSK, and convolutional code concatenated using RS code as the channel coding, pseudo-random bit sequence (Pseudo Random BitSequence, i.e. PRBS) scrambled using a wireless satellite link, only for fixed reception system is not available for the mobile terminal. DVB-T标准采用多载波正交频分复用(Orthogonal Frequency Division Multiplexing,即OFDM)调制技术和级联的卷积码与RS码的编码技术,适用于开路地面传输,但支持的移动速度较低。 DVB-T standard uses a multi-carrier Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing, i.e., OFDM) modulation and coding concatenated convolutional code and RS code is applied to open terrestrial transmission, but supports the moving faster than low. DVB-H系统随为了移动和手持进行了优化,但由于受到DVB-T编码、调制技术的的局限,优化并不充分。 With the DVB-H system to mobile and handheld optimized, but due to the limitations DVB-T coding, modulation techniques to optimize is not sufficient.

2)美国ATSC标准 2) American ATSC standard

美国的ATSC标准是先进电视制式委员会(Advanced Television SystemCo麵ittee,即ATSC )提出的单载波数字电视地面传输标准,能支持标准清晰度和高清晰度数字电视的固定接收,但移动接收条件下的性能较差,而且不支持卫星传输。 American ATSC standard is a single-carrier terrestrial digital TV transmission standard Advanced Television Systems Committee (Advanced Television SystemCo face ittee, ie, ATSC) proposed to support fixed receive standard definition and high definition digital television, but mobile reception under conditions poor performance, and it does not support satellite transmission.

3)曰本ISDB-T标准 3) said this ISDB-T standard

ISDB-T是日本的数字广播专家组制订的地面综合数字业务广播(Integrated Service Digital Broadcasting- Terrestrial)标准,采用OFDM技术和卷积码、RS码实现多种数字业务的地面广播,但移动接收条件下的性能很差,也不支持卫星传输。 ISDB-T is a digital broadcast in Japan developed LEG terrestrial Integrated Services Digital Broadcasting (Integrated Service Digital Broadcasting- Terrestrial) standard using OFDM technology and a convolutional code, RS code to achieve a variety of digital terrestrial broadcasting services, but the mobile reception conditions poor performance under, it does not support satellite transmission.

4)日韩数字卫星广播标准 4) Japan and South Korea Digital Satellite Broadcasting Standards

1998 年5 月,Toshiba、SKTelecomm. Sharp、Toyota Motor 等公司共同出资,成立了移动广播公司(Mobile Broadcasting Corporation ),并于2004年3月发射了广播卫星,现已开始运营,对日本、韩国提供服务。 In May 1998, Toshiba, SKTelecomm. Sharp, Toyota Motor and other companies jointly funded the establishment of Mobile Broadcasting Corporation (Mobile Broadcasting Corporation), and in March 2004 launched a broadcast satellite, has begun operations in Japan, South Korea provided service. 系统采用也使用了PRBS、带交织的级联编码,并采用CDM扩频的方式进行传输。 The system also uses the PRBS used, concatenated coding with interleaving, and spreading manner of CDM transmission. 日韩数字卫星广播标准虽然可以支持移动接收,但性能仍然不够理想,有待进一步的改善。 Japan and South Korea Digital Satellite Broadcasting standard although can support mobile reception, but the performance is still not satisfactory, needs to be further improved.

发明内容 SUMMARY

本发明是在针对上述四种传输方式的不足进行优化设计以后提出的一种可以适用于卫星传输、地面传输等多种环境的的集成式无线多业务广播的数字信息传输方法,用于为移动、便携和固定接收用户提供高质量的音频、视频和多媒体数据业务。 The present invention is an optimized design for the future shortage of the four proposed transmission can be applied to a digital information transmission method of multi-service wireless integrated broadcasting a plurality of satellite transmission environment, other terrestrial transmission for mobile , portable and fixed receivers provide users with high-quality audio, video and multimedia data services.

本发明提出一种多载波数字移动多媒体广播的数字信息传输方法,包括以下步骤: The present invention proposes a method for transmitting digital information multicarrier digital mobile multimedia broadcasting, comprising the steps of:

通过RS编码与字节交织器对上层数据流进行RS编码和字节交织,其中,所述字节交织器妁行数由星座映射方式和LDPC码率决定;· 通过LDPC编码器对经过字节交织的数据进行LDPC编码,得到比特数据; RS encoding by the byte interleaver upper layer data stream and byte interleaved RS coding, wherein the number of the byte interleaver is determined by the matchmaker rows LDPC code rate and constellation mapping mode; by-byte through LDPC encoder LDPC encoding the interleaved data to obtain bit data;

通过比特交织器对经过LDPC编码的比特数据进行比特交织; By a bit interleaver of the data bits through LDPC encoded bit interleaving;

通过星座映射器对经过比特交织的数据进行星座映射; Mapping after bit interleaving of data through the constellation of constellation mapper;

通过频域符号生成器将离散导频、包含有系统信息的连续导频以及上述经过星座映射的数据符号复接在一起组成OFDM频域符号; Frequency-domain symbols by the scattered pilot generator, comprising a continuous guide system information and said pilot data symbol, constellation mapping multiplexed together to form the OFDM frequency domain symbols;

通过扰码器对上述经复接得到的OFDM频域符号进行扰码; Scrambling the OFDM frequency-domain symbols obtained by the multiplexed by the scrambler;

通过IFFT变换器将上述经过扰码的频域符号经过IFFT变换产生OFDM时域符号;通过时域组帧器将上述时域OFDM符号经过插入桢头组成时隙后,连接组成物理层信号巾贞; The above-described frequency-domain symbols after IFFT transformation scrambling code is generated through a time domain OFDM symbol through IFFT transformer; time domain will framing said time domain OFDM symbol after insertion slot frames composed header, connected to form a physical layer signal towel Zhen ;

对上述物理层信号桢进行低通滤波和正交上变频后发射。 Transmitting the frames of the above-described physical layer signals and low pass filtering the quadrature conversion.

所述的数字信息传输方法用于传输包括音频数据、文本、视频数据在内的多媒体广播数据。 The digital information transmission method for transmitting data including audio, text, video, multimedia data including broadcast data.

该系统采用了LDPC的OFDM方案,系统接收机使用最先进的微波和大规模数字集成电路技术,同时满足了低成本和高性能的要求。 The system uses an OFDM LDPC scheme, the receiver system using the latest microwave and large scale integrated circuit technology, while meeting the requirements of low cost and high performance.

附图说明 BRIEF DESCRIPTION

图I为本发明的移动多媒体广播系统的广播信道物理层逻辑信道结构·图。 Figure I is a mobile multimedia broadcast system, a broadcast physical layer logical channel structure of the present invention. FIG. ·.

图2为本发明的移动多媒体广播系统物理层的逻辑信道编码和调制流程图; Logical channel encoding and modulating a physical layer flowchart mobile multimedia broadcasting system of FIG. 2 of the present invention;

图3为图2中由时隙组帧所形成的物理层信号帧的时隙划分和帧结构图; 3 is divided into time slots and a physical layer frame structure of the signal frame in FIG. 2 by the slot formed in the frame group;

图4为图3中信标的结构图; FIG 4 is a configuration diagram of FIG. 3 CITIC subject;

图5为同步信号的伪随机序列生成器结构示意图; FIG 5 is a schematic structure of a pseudo random sequence generator synchronization signal;

图6为图3中OFDM符号的结构图; FIG 6 is a structural view of OFDM symbols in FIG 3;

图7为保护间隔之间交叠的示意图; 7 is a schematic view of overlap between the guard interval;

图8为OFDM符号结构示意图; 8 is a schematic view of an OFDM symbol structure;

图9为字节交织器与RS ( 240,K)编码的示意图;图10为对经过LDPC编码后的比特流进行比特交织的示意图; FIG 9 is a byte interleaver (240, K) is a schematic view with the RS encoder; FIG. 10 is a LDPC coded bits after the bit interleaving schematic stream;

图U、12和13分别为BPSK星座映射图、QPSK星座映射图和16QAM星座映射图; FIG U, 12 and 13 are BPSK constellation map, QPSK constellation 16QAM constellation map and the map;

图14为将OFDM符号的子载波分配给数据符号、离散导频和连续导频的导频复接方式示意图; FIG 14 is a sub-carriers of the OFDM symbols allocated to the data symbol, scattered pilot and a continual pilot pilot pilot multiplexing a schematic manner;

图15为PRBS生成方法的示意图; FIG 15 is a schematic diagram of the method of the PRBS generator;

图16为OFDM符号子载波结构示意图。 FIG 16 is a schematic structure of an OFDM symbol sub-carriers.

具体实施方式本发明可提供包括高质量的数字音频广播、数字视频广播在内的多媒体节目。 DETAILED DESCRIPTION The present invention can provide high-quality digital audio broadcasting comprise, including digital video broadcast multimedia programs.

本发明定义了每2MHz频带内,能对移动多媒体广播系统广播上层数据流进行适配处理的物理层各功能模块,给出了移动多媒体广播信道物理层传输信号的帧结构、信道编码、调制技术。 The present invention defines in each 2MHz band capable physical layer adaptation processing functional modules of a mobile multimedia broadcast system, a broadcast layer data stream, given the frame structure of mobile multimedia physical layer transmission signal is a broadcast channel, channel coding, modulation .

物理层是OSI的底层,是整个开放系统的基础。 The physical layer is the bottom layer of the OSI, is the basis of an open system. 物理层为设备之间的数据通信提供传输媒体及互连设备,为数据传输提供可靠的环境。 The physical layer provides transmission media interconnects and data communication between devices, to provide a reliable environment for data transmission.

本发明定义的广播信道物理层通过物理层逻辑信道来适配上层各类应用对传输速率的不同要求。 The physical layer broadcast channel defined in the present invention is adapted to the different requirements of various applications of the upper layer transmission rate of the physical layer through a logical channel. 物理层逻辑信道支持多种编码和调制方式用以满足不同应用、不同传输环境对信号质量的不同要求。 The physical layer to support multiple logical channel coding and modulation schemes to meet different applications, different requirements for different transmission environments signal quality.

本发明定义的广播信道物理层支持单频网和多频网两种组网模式,可根据实际应用的特性和组网环境选择不同的传输模式和参数。 The physical layer broadcast channel defined in the present invention may support a single frequency network according to the characteristics and networking environment and select the actual application of different transmission modes and parameters of the multi-frequency network types of networking modes. 支持多种应用的混合模式,达到应用特性与传输模式的匹配,实现了应用的灵活性和经济性。 It supports a variety of mixed-mode applications, to match the characteristics of the application and transfer mode, to achieve the flexibility and economy applications.

下面参照附图对本发明的优选实施例进行详细说明。 Referring to the drawings the preferred embodiments of the present invention will be described in detail. 图I为本发明的移动多媒体广播系统的广播信道物理层逻辑信道结构图。 I FIG broadcast channel physical layer logical block diagram of a mobile multimedia broadcast system of the present invention.

如图所示,物理层通过物理层逻辑信道(Physical Logical Channel,即PLCH )(包括控制逻辑信道CLCH和业务逻辑信道SLCH )提供上层应用的广播通道。 As shown, the physical layer through a logical channel physical layer (Physical Logical Channel, i.e. of PLCH) (including logical operations, and control logical CLCH SLCH) providing a broadcast channel upper application. 每个物理层逻辑信道可以使用2MHz数字电视带宽内的一个或多个时隙发送。 Each logical channel may be transmitted using a physical layer or a plurality of slots in the digital television bandwidth of 2MHz. 物理层对每个物理层逻辑信道进行单独的编码和调制。 Physical layer coding and modulation separately for each of the physical layer logical channel. 根据编码和调制参数不同,物理层逻辑信道可提供不同传输容量。 Depending on the coding and modulation parameters, the physical layer logical channel may provide different transmission capacities.

图2为本发明的移动多媒体广播系统物理层的逻辑信道编码和调制流程图。 Logical channel encoding and modulating a physical layer flowchart mobile multimedia broadcasting system of FIG. 2 of the present invention.

如图所示,物理层逻辑信道的输入数据流经过前向纠错编码、交织和星座映射后,与离散导频以及连续导频复接在一起进行OFDM调制。 As shown, the input data before the physical layer logical flow through the forward error correction coding, interleaving, and constellation mapping, and scattered pilot and a continual pilot OFDM-modulated multiplexed together. 调制后的信号经过插入巾贞头后形成物理层信号巾贞。 The modulated signal is inserted after the first towel Chen Chen towels physical layer signals formed. 再经过基带至射频变换后进行发射。 Then through the transmit baseband to radio frequency conversion.

物理层逻辑信道分为控制逻辑信道(CLCH)和业务逻辑信道(SLCH)。 The physical layer is divided into logical control logical channel (CLCH) and the service logical channel (SLCH). 控制逻辑信道用于承载系统配置信息,采用固定的信道编码和调制模型在系统第O时隙发送,其中:RS编码采用RS (240, 240) , LDPC编码采用1/2码率LDPC编码,星座映射釆用BPSK映射,扰码模式为模式O。 Logical channel for carrying a control system configuration information, fixed channel coding and modulation transmission system model of O slot, wherein: RS coding using RS (240, 240), LDPC coding using rate 1/2 LDPC coding, constellation preclude the use of BPSK mapping mapping, scrambling mode to mode O. 业务逻辑信道可以占用除第O时隙外的一个或多个时隙发送,其编码和调制模式由上层配置,配置信息通过控制逻辑信道广播。 Service logical channel can occupy one or more O slot except the first time slot of the transmission, which modulation and coding modes configured by the upper layer, a broadcast control logical configuration information.

图2中各子模块的详细说明见下文所述。 In FIG. 2 described in detail below for each of the sub-module.

图3为图2中由时隙组帧所形成的物理层信号帧的时隙划分和帧结构图。 3 is divided into time slots and a physical layer frame structure of the signal frame in FIG. 2 by the slot formed in the frame group.

如图所示,系统物理房信号每I秒为I顿,每桢划分为40个时隙(Timeslot,即TS ),各时隙的长度为25ms。 As shown, the system signals for each physical room for the second I I Dayton, per frame is divided into 40 time slots (Timeslot, i.e. the TS), the length of each slot is 25ms.

每个时隙包括I个信标和53个OFDM调制数据块。 Each beacon slot includes I and 53 OFDM modulated data block. 图4为图3中信标的结构图。 FIG 4 is a configuration diagram of FIG. 3 CITIC subject.

如图所示,信标包括2个相同的同步信号以及发射机标识信号(ID)。 As shown, the beacon including the same synchronization signal and identification signal transmitter 2 (ID).

同步信号为频带受限的伪随机序列,长度为204. 8us,该同步信号的生成方式为:首先通过图5所示的同步信号的伪随机序列生成器生成伪随机序列,如图所示,该伪随机序列生成多项式为xn+x9+l,预设值为01110101101;然后截取上述2047点m序列的前314点,采用BPSK映射(O->l + 0j, l+-l+0j)后放在512 点(0-511)序列的第I ~ 157 和第355 ~511点;对上述生成的512点序列进行512点IFFT后,得到同步信号。 Pseudo-random sequence synchronizing signal is band-limited with a length of 204. 8us, the synchronization signal generation method is as follows: first pseudo-random sequence generated by a pseudo-random sequence generator synchronization signal shown in FIG. 5, as shown, the pseudo-random sequence generator polynomial xn + x9 + l, default value 01110101101; taken before and after the above point of 2047 points 314 m-sequence using BPSK mapper (O-> l + 0j, l + -l + 0j) discharge the first and the second I ~ 157 355 ~ 511 512 points in the point sequence (0-511); after the generation of the sequence 512 performs 512-point IFFT, to obtain a synchronization signal.

发射机标识信号(ID)发送用于标识不同发射机的频带受限的伪随机序列,长度为36us。 Transmitter identification signal (ID) transmits a band-limited pseudo-random sequence to identify different transmitters, the length of 36us. 发射机标识信号的生成方法为:选择发射机标识序列;将37点发射机标识序列采用BPSK映射(O +l+0j, I ->-l+0j )后放在64点(O ~ 63 )序列的第I ~ 18和第45 ~ 63点上;对上述生成的64点序列进行64点IFFT后,并周期延拓26点至90点得到发射机标识信号。 The method of generating the transmitter identification signal is: selecting the transmitter identification sequence; sequence identity of 37 point transmitter using BPSK mapper (O + l + 0j, I -> - l + 0j) on the 64-point (O ~ 63) on the first and the second I ~ 18 45 ~ 63 point sequence; sequence generator 64 points after the 64-point IFFT, and periodic extension point 90 to point 26 to obtain the transmitter identification signal. · ·

上述发射机标识序列是长度为37比特的伪随机序列。 Above the transmitter identification sequence pseudo-random sequence having a length of 37 bits. 发射机标识序列共包括2 5 6个序列,其中序列O ~序列12 7为地区标识,用于标识发射机所在的地区,其插入信号帧中的偶数时隙发送(第O时隙,第2时隙,……);序列128 ~ 255为发射机标识,用于标识同一地区内的不同发射机,其插入信号帧中的奇数时隙发送(第I时隙,第3时隙,……)。 Transmitter identification sequence includes a total of 256 sequences, wherein the sequence of O ~ 127 region sequence identifier for identifying areas where the transmitter which is inserted in the even slots transmission signal frame (the first O slot, the second slot, ......); sequence 128 to 255 of transmitter identification, for identifying different transmitters in the same area, which is inserted into the slot for transmitting the odd (first I slots, the third slot in the signal frame, ...... ). 发射机标识序列由十六进制序列定义,该十六进制序列按照最高有效比特在先的顺序映射为二进制发射机标识序列,以便进入上述的BPSK映射步驟。 Transmitter identification sequence defined by the hexadecimal sequence, the hexadecimal sequence according to the most significant bit of the previous binary transmitter identification sequence is mapped to a sequence, to enter the above-described BPSK mapping step. 发射机标识序列如表I所示。 Transmitter identification sequence set forth in Table I below.

表1、发射机标识序列 Table 1, the transmitter identification sequence

图6为图3中OFDM符号的结构图。 FIG 6 is a structural view of OFDM symbols in FIG. 3.

如图所示,OFDM符号由循环前缀(CP)和OFDM符号体构成,循环前缀长度U 51. 2us,即IFFT后的128个采样点,OFDM符号长度TS为409. 6us,即IFFT后的1024个采样点。 As shown, the OFDM symbol by a cyclic prefix (CP) and the material constituting the OFDM symbol, cyclic prefix length U 51. 2us, i.e. 128 samples after the IFFT, the OFDM symbol length TS of 409. 6us, i.e., the IFFT 1024 sampling points.

图3中的发射机标识信号、同步信号和相邻OFDM符号之间通过保护间隔(GD)相互交叠,保护间隔GD的长度1^为2. 4us,即IFFT后的6个采样点。 The transmitter identification signal in FIG. 3, the synchronization signal and the overlap between adjacent OFDM symbols by the guard interval (GD) with each other, the length of the guard interval GD ^ 1 to 2. 4us, i.e., six samples after IFFT. 相邻符号之间,前一个符号的尾部GD与后一个符号的头部GD经过窗函数加权后叠加,如图7所示。 Between adjacent symbols, one symbol before the tail GD and GD symbol after a head portion of a window function weighting after superposition, as shown in FIG.

所述的窗函数表达式为: The window function expression:

0.5 + 0.5 cos(^r + π(Τ-ί) / TGD), T-TGD<t<T 其中,t 为时间变量,T 0.5 + 0.5 cos (^ r + π (Τ-ί) / TGD), T-TGD <t <T where, t is a time variable, T

为常数,为所述保护间隔的长度。 It is a constant, the length of the guard interval.

保护间隔信号的选取如图8所示。 Selecting a guard interval signal shown in Fig. 对于发射机标识信号,同步信号和OFDM符号,TO和Tl部分的取值见表2。 For the transmitter identification signal, and an OFDM symbol synchronization signal, TO and Tl values ​​in Table 2 portions.

表2、保护间隔信号取值表下面对图2中的各个子系统进行详细说明。 Table 2, a table of values ​​below a guard interval signal for each subsystem in FIG. 2 described in detail.

图9为字节交织器与RS ( 240, K)编码的示意图。 FIG 9 is a byte interleaver and the RS (240, K) coding schematic.

如图所示,字节交织器为MI行、240列的块交织器。 As shown, the byte interleaver is a row MI, block interleaver 240. 字节交织器的行数MI由星座映射方式和LDPC码率决定,如表3所示: Byte interleaver is determined by the number of rows MI LDPC code rate and constellation mapping mode, as shown in Table 3:

表3、字节交织器参数MI的取值表 Table 3, byte interleaver parameter table of values ​​MI

RS码采用码长为240字节的RS (240, K)截短码。 RS code using the code length of 240 bytes of RS (240, K) shortened code. 该码由原始的RS ( 255, M )系统码通过截短后产生,其中,M=K+15, K为一个码字中信息序列的字节数,同时校验字节数为(240 -K)。 The code (255, M) after truncation systematic code generated by the RS by the original, where, M = K + 15, K is the number of bytes of information in the codeword sequence, while the number of check bytes (240-- K). RS (240, K)码提供4种模式,这4种模式中K的取值分别为K=240、Κ=224、Κ=192和Κ=176。 RS (240, K) code is provided four modes, the four modes K values ​​are K = 240, Κ = 224, Κ = 192 and Κ = 176.

RS ( 255,Μ)系统码的每个码元取自域GF (256),其域生成多项式为 Each symbol is taken from field GF RS (255, Μ) systematic code (256), which is a field generator polynomial

p(x) = X8 + X4 + X3 + X2 +1。 p (x) = X8 + X4 + X3 + X2 +1.

截短码RS (240, K)采用如下方式进行编码:在K个输入信息字节(wQ,W1,前添加15个全“O”字T7,构造为原始的RS ( 255, M )系统码的输入序列(0,...0,m0,m',.",mK_1'), 编码后生成码+(O,·■-O5Ot0,^,···,/>0,^l,■··,/>255_Μ_,),再从码字中删去所添加的字节,即得到240字节的截短RS码的码字 Shortened code RS (240, K) is coded in the following way: the K input information bytes (wQ, W1, before the addition of the full 15 "O" word T7, configured to the original RS (255, M) code system input sequence (0, ... 0, m0, m ',. ", mK_1'), the code generation code + (O, · ■ -O5Ot0, ^, ···, /> 0, ^ l, ■ ··, /> 255_Μ_,), then added by deleting bytes from the codeword, i.e. a truncated RS code to obtain a codeword of 240 bytes

RS ( 240,K)码的生成多项式的表达式为: RS (240, K) code generating polynomial expression is:

输入的信息序列多项式的表达式为: Polynomial expression input information sequence is:

输出的系统码多项式的表达式为: Output system code polynomial expression is:

其中r(x) =-» Where r (x) = - »

RS (240,224)的生成多项式表达式的系数gi为: Coefficients gi RS (240,224) generating polynomial expression is:

RS (240,192)的生成多项式表达式的系数g,为: RS (240,192) of the generator polynomial expression coefficients g, of:

列输入块交织器,每列MI字节,直到第K列完成。 Input block interleaver columns, each column of bytes MI, K column until completion. RS编码按行进行编码,校验字节填充至后(24O-K)列。 RS encoding is encoded in the row, after filling to check byte (24O-K) columns. 编码后的数据再按照输入的顺序从左至右逐列输出,直到240列全部完成。 The encoded data is then entered in the order of output column by column from left to right, 240 until completed.

上述RS编码和字节交织以物理逻辑信道为单位进行,相同物理逻辑信道的上层数据包依次输入字节交织器进行字节交织和RS编码。 RS encoding and the above-described physical byte interleaving in units of logical channels, logical channels of the same physical layer data packets sequentially input byte interleaver and RS code byte interleaving. 字节交织器第O列的第一个字节定义为字节交织器的起始字节。 The first byte defines the first byte interleaver is O column's start byte interleaving bytes. 字节交织器每次的输出(MI X 240字节)总是映射在整数个时隙上发送,其中字节交织器的起始字节映射在某个时隙的起始点发送。 Each byte interleaver output (MI X 240 bytes) is always mapped on an integer number of transmission time slots, wherein the starting bytes mapped byte interleaver transmits the start point of a certain time slot.

经过上述RS编码和字节交织后的传输数据按照高位比特优先发送的原贝1J,将每字节映射为8位比特流,送入LDPC编码器。 After transmission of the RS-encoded data bytes and interleaving according to the original shell 1J upper bit priority transmitted, each eight-bit byte stream is mapped, into LDPC encoder. 字节交织器第O列的第一个字节定义为字节交织器的起始字节,其最高位总是映射在LDPC输入比特块的第一个比特。 The first byte defines the first byte interleaver O byte interleaving column's start byte, the most significant bit which is always a first bit mapped input block of bits in LDPC. LDPC编码配置如表4所示: The LDPC encoder configured as shown in Table 4:

end; end;

2)、2 LDPC码校验矩阵生成方法4 2), 2 LDPC code parity check matrix generation method 4

以下为生成Ildpc码校验矩阵的循环程序段: The following code is a check matrix generating Ildpc cycle block:

4 4

for 1=1: 9; for 1 = 1: 9;

取上表第I行,记为hexp; for J=I: 256; Table I taken on the line, referred to as hexp; for J = I: 256;

row = ( JI ) *9+1; for K=I: 12; row = (JI) * 9 + 1; for K = I: 12;

column = [([hexp(K)/ 36」+ J -1)%256]* 36 + (hexp(K)%36) +1. column = [([hexp (K) / 36 "+ J -1)% 256] * 36 + (hexp (K)% 36) +1.

奇偶校验矩阵的第row行第column列为非0元素; The first row of the first row of the parity check matrix as the column non-zero elements;

end; end;

end; end;

end;图10为对经过LDPC编码后的比特流进行比特交织的示意图。 end; FIG. 10 is a schematic diagram of the bit-interleaved bit stream through LDPC encoding.

如图所示,比特交织器釆用192X144的块交织器。 As shown, the bit interleaver is a block interleaver preclude the 192X144. LDPC编码后的二进制序列按照从上到下的顺序依次写入块交织器的每一行,直至填满整个交织器,再从左到右的按列依次读出。 LDPC encoding the binary sequence are sequentially written in each row in this order from the block interleaver, until fill the interleaver by columns and then sequentially read from left to right. 比特交织器的输出与时隙对齐,即,每个时隙中传送的第一个比特总定义为比特交织器输出的第一个比特。 The output of the bit interleaver is aligned slots, i.e., the first bit transmitted in each time slot always defined as a first bit interleaving bit output.

图11、12和13分别为BPSK星座映射图、QPSK星座映射图和16QAM星座映射图。 11, 12 and 13 are BPSK constellation map, QPSK constellation map and the 16QAM constellation map. 采用BPSK、QPSK和16QAM星座映射所对应的功率归一化因子分别是1/W、1/V2 , \/抛。 Using BPSK, QPSK and 16QAM constellation mapping corresponding power normalization factor are 1 / W, 1 / V2, \ / polishing.

图14为将OFDM符号的子载波分配给数据符号、离散导频和连续导频的导频复接方式示意图。 FIG 14 is a sub-carriers of the OFDM symbols allocated to the data symbol, scattered pilot and a continual pilot pilot pilot multiplexing embodiment of FIG.

如图所示,斜线部分为连续导频信号,黑色部分为离散导频信号,白色部分为经星座映射得到的数据符号。 As shown, the shaded portion is a continuous pilot signal, black part of the scattered pilot signal, a data symbol white part obtained by constellation mapping. 图示的导频复接将数据符号、离散导频和连续导频复接在一起,组成OFDM频域符号。 Illustrates pilot multiplexing data symbols, scatter pilot and a continual pilot multiplexed together to form the OFDM frequency domain symbols. 每个OFDM符号包括628个子载波( 0 - 627 ),记为X(/),/ = 0,1,---627,其中包括78个离散导频、28个连续导频、522个数据子载波。 Each OFDM symbol includes 628 subcarriers (0--627), referred to as X (/), / = 0,1, --- 627, which includes 78 pilots discrete, continuous pilots 28, data sub-522 carriers.

图15 中,连续导频使用第O, 20, 32, 72, 88, 128, 146, 154, 156, 216,220,250, 296, 313, 314, 330, 388,406, 410,470, 472, 480, 498,538, 554,594, 606,627个子载波,共28个。 15, the use of a continuous pilot O, 20, 32, 72, 88, 128, 146, 154, 156, 216,220,250, 296, 313, 314, 330, 388,406, 410,470, 472, 480 , 498,538, 554,594, 606,627 subcarriers, a total of 28.

其中第20, 32, 72, 88, 128, 146, 154, 156,470,472, 480, 498, 538, 554,594, 606共16个载波承载16比特系统信息,映射关系如表5所示,系统信息具体表述如表6所示。 Wherein the first 20, 32, 72, 88, 128, 146, 154, 156,470,472, 480, 498, 538, 554,594, 606 of 16 16-bit system information carrier carries, the mapping relation as shown in Table 5 , particularly the expression system information as shown in table 6. 其余连续导频传输“O”。 Remaining continuous pilot transmission "O".

表5、连续导频上的重复编码方式 Table 5, continuous conduction mode frequency of repetition coding on

表6中各比特具体所包含信息内容如下:1)、bit0~bit5为当前时隙号,取值范围0-39; Table 6 bits of each of the specific information included in the content as follows: 1), bit0 ~ bit5 is the current slot number, in the range 0-39;

2)、bit6为字节交织器同步标识,该比特取值为I时标识本时隙为字节交织器起始时隙; 2), bit6 identified as a sync byte interleaver, the bit value is the identifier of the time slot when I byte interleaving unit starting slot;

3)、bit7为控制逻辑信道变更指示,其采用差分调制的方式指示终端控制逻辑信道配置信息变更。 3), bit7 change instruction to control the logical channel, which uses differential modulation mode control logical configuration information indicating that the terminal changes. 所述差分方式如下:假设上一帧bit7传送的是a ( O或者I ),而系统控制信道配置信息将在下一巾贞发生变更,则在本顿中传送5并保持下去,直到发生下次变更。 The difference is as follows: Assuming the transmission is a bit7 a (O or the I), and the system configuration information control channel changes occur in the next towel Zhen, the transmission 5 in Benton and maintained until the next occurrence change.

4)、bit8~bitl5 保留。 4), bit8 ~ bitl5 reserved.

连续导频以+ ,l->-V2/2-V2/2y的方式映射到子载波上。 In continuous pilot +, l -> - V2 / 2-V2 mode / 2y mapped onto subcarriers. 同一时隙内不同OFDM符号的相同连续子载波点上传输的符号相同。 Transmission on the same point of the same consecutive subcarriers of different OFDM symbols within the same time slot symbol.

记η为每个时隙中OFDM符号的编号,0<«<52; m为每个OFDM符号中离散导频对应的子载波编号,则m取值如下: Η referred to as an OFDM symbol in each slot numbers, 0 < «<52; m for each OFDM symbol, scattered pilot corresponding to the subcarrier number, the m values ​​are as follows:

离散导频全部置为〗 + G·/。 All scattered pilot set〗 + G · /.

图14中,按子载波、OFDM符号的前后顺序映射数据信号。 14, according to sub-carrier, OFDM symbol before and after the mapping order of the data signal. 每个时隙中的27666个数据子载波中,前27648个子载波用于承载字符交织器输出的复符号,最后18个符号补O。 Each slot 27 666 data subcarriers, the front sub-carriers for carrying 27648 complex symbols interleaved character output, the last 18 symbols complement O.

图14所示时频格栅上的所有符号(有效子载波),包括数据子载波、离散导频和连续导频等,均被一个复伪随机序列PJO扰码。 When all the symbols shown in FIG. 14 (effective subcarrier), the data comprising a pilot subcarrier grid, scatter pilot and a continual pilot and so on, are a pseudo-random sequence PJO complex scrambling code. 所述复伪随机序列pt.(/)的生成方式如下: The complex pseudo-random sequence pt (/) is generated as follows:

其中,(,_)和&(/)为二进制伪随机序列(PRBS)。 Wherein, (, _) and & (/) is a binary pseudo-random sequence (PRBS).

图15为PRBS生成方法的示意图。 FIG 15 is a schematic diagram of the method of the PRBS generator.

如图所示,PRBS的生成多项式为:χ12+χπ+χ8+χ6+1,与图示的移位寄存器结构相对应。 As shown, PRBS generator polynomial is: χ12 + χπ + χ8 + χ6 + 1, illustrated with a shift register corresponds to the structure. 移位寄存器的初始值由扰码模式确定,其对应关系如下: The initial value of the shift register is determined by scrambling mode, the corresponding relationship is as follows:

PRBS在每个时隙开头重置,所有时隙都被相同图样扰码。 PRBS reset at the beginning of each time slot, time slots are all the same scrambling code pattern.

该扰码通过将有效子载波上的复符号和复伪随机序列Pc (/)进行复数乘法而实现,所述扰码的表达式为: The scrambling is achieved by multiplexing the multiplexed symbols and the pseudo-random sequence Pc on effective sub-carriers (/) is a complex multiplication of the scrambling code expression:

Yn(O = Xn(/)XPcOX628 + i), 0<i< 627, O <«<52 Yn (O = Xn (/) XPcOX628 + i), 0 <i <627, O < «<52

其中,为扰码前每个时隙第η个OFDM符号上的第i个有效子载波,Yn(i)为扰码后的有效子载波。 Wherein, for each time slot of before scrambling η i-th subcarrier of the active OFDM symbol, Yn of (i) as an active subcarriers after scrambling.

图16为OFDM符号子载波结构示意图。 FIG 16 is a schematic structure of an OFDM symbol sub-carriers.

上述插入导频并扰码后的OFDM子载波X (i), i=0, I,…,1023经过IFFT变换产生OFDM时域符号。 The insertion and scrambling the pilot symbols of OFDM subcarriers X (i), i = 0, I, ..., 1023 through IFFT transformation produced OFDM time domain symbol. 所述IFFT变换步骤是将628个有效子载波放在1024个子载波的第I〜314和第710 ~ 1023子载波上后进行1024点IFFT变换。 The IFFT transforming step 628 is performed on the 1024 active subcarriers on the IFFT point of subcarrier I~314 1024 and 710 to 1023 after the subcarrier. IFFT变换方式如下: IFFT transformation follows:

I >023 I> 023

y(t)= YjY {n)e 1024 , Q <t <4Q9.6us,fs = 2.5ΜΗζ y (t) = YjY {n) e 1024, Q <t <4Q9.6us, fs = 2.5ΜΗζ

VI 024 η=0 VI 024 η = 0

其中, among them,

经过IFFT变换的OFDM符号按照图6所述,加入循环前缀(CP ),组成时域OFDM符号。 OFDM symbols after IFFT transformation according to the FIG. 6, the cyclic prefix is ​​added (the CP), the composition of the time domain OFDM symbol.

调制后的OFDM符号,按照图3所述的帧结构,依次加入保护间隔、同步信号、发射机识别信号后组成时隙。 The modulated OFDM symbols, according to the frame structure according to FIG. 3, a guard interval is added successively to form the slot synchronization signal, a transmitter identification signal. 再将40个时隙连接组成物理层信号帧。 Then 40 time slots connected to form a physical layer signal frame.

本系统采用的时域成形滤波器为FIR滤波器,满足信号带宽内纹波衰减<1 dB,带宽外衰减>40 dBc。 The system uses a time-domain shaping filter is a FIR filter, the ripple signal bandwidth to meet the attenuation <1 dB, the bandwidth attenuation> 40 dBc. 频带带宽为2MHz,和数字音频广播带宽兼容。 Frequency bandwidth of 2MHz, and a compatible digital audio broadcast bandwidth. 系统采样率为2. 5MHz,每频道的信号带宽为I. 536MHz。 The system sampling rate 2. 5MHz, the signal bandwidth per channel is I. 536MHz.

本系统的上层数据流可以釆用包括H. 264、AVS、MPEG-2、MPEG-4等视频流,AC-3、AAC等音频流,和其它多种数据类型的数据格式。 Upper layer data stream may preclude the use of the present system include H. 264, AVS, MPEG-2, MPEG-4 and other video stream, AC-3, AAC and other audio streams, multiple data types and other data formats. 对数据编码可包括单一媒体(例如视频源编码、文本)和多媒体(音频、视频、文本和数据的混合)在内的各种类型的广播数据。 Various types of broadcast encoded data may comprise a single media data (e.g., video source coding, text), and multimedia (audio mixing, video, and text data) including.

本发明不局限于上述特定实施例子,在不背离本发明精神及其实质情况下,熟悉本领域技术人员可根据本发明作出各种相应改变和变形,但这些相应改变和变形都应属于本发明所附权利要求保护范围之内。 The present invention is not limited to the particular example embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding modifications and variations according to the present invention, but such corresponding changes and variations of the present invention should fall within the scope of the appended claims.

Claims (40)

1、一种多载波数字移动多媒体广播的数字信息传输方法,其特征在于包括以下步骤: 通过RS编码与字节交织器通过物理逻辑信道对上层数据流进行RS编码和字节交织,其中,所述字节交织器的行数由星座映射方式和LDPC码率決定; 通过LDPC编码器对经过字节交织的数据进行LDPC编码,得到比特数据; 通过比特交织器对经过LDPC编码得到的比特数据进行比特交织; 通过星座映射器对经过比特交织的数据进行星座映射; 通过频域符号生成器将离散导频、包含有系统信息的连续导频以及经过星座映射的数据符号复接在一起组成OF面频域符号; 通过扰码器对上述经复接得到的OFDM频域符号进行扰码; 通过IFFT变换器将上述经过扰码的频域符号经过IFFT变换后产生OFDM时域符号; 通过时域组帧器将上述时域OFDM符号经过插入帧头组成时隙后,连接组成物理层信号帧; The digital information transmission method, a multi-carrier digital mobile multimedia broadcasting, characterized by comprising: performing RS encoding and the RS coding and interleaving byte interleaver by byte logical channel physical layer data stream, wherein the said number of lines determined by the byte interleaver LDPC code rate and constellation mapping mode; through LDPC encoder performs LDPC encoding through the data byte interleaving, bit data obtained; by a bit interleaver of the data bits through LDPC encoding is obtained bit interleaving; perform constellation mapping of the constellation mapper passes through the interleaved data bits; frequency-domain symbol generator by the scattered pilot, guide system information comprising continuous pilot and data symbol, constellation mapping multiplexed together to form the oF surface frequency-domain symbols; scrambled symbols of the OFDM frequency domain obtained by the above-described multiplexed by the scrambler; IFFT transformer by the frequency-domain symbols through the above-described scrambling code generation after IFFT transformation OFDM time domain symbols; time domain group the above-described frame is time-domain OFDM symbols after insertion slot composition header, connected to form a physical layer signal frame; 对上述物理层信号帧进行低通滤波和正交上变频后发射。 After transmitting the physical layer of the above-described signal frame and low pass filtering the quadrature conversion.
2、如权利要求I所述的数字信息传输方法,其特征在于,该方法使用无线信道内任意2MHz带宽,并和数字音频广播带宽兼容。 2. The digital information transmission method as claimed in claim I, wherein the method uses any of the radio channel 2MHz bandwidth and the bandwidth and compatible digital audio broadcasting.
3、如权利要求I所述的数字信息传输方法,其特征在于,该方法中采样率为2. 5MHz,每频道的信号带宽为I. 536MHz。 3, as a digital information transmission method as claimed in claim I, wherein the sampling rate of the process 2. 5MHz, the signal bandwidth per channel is I. 536MHz.
4、如权利要求I所述的数字信息传输方法,其特征在于,该上层数据流为包括H. 264、AVS、MPEG-2、MPEG-4的视频流以及包括AC - 3、AAC的音频流的数据流。 4. The digital information transmission method as claimed in claim I, wherein the upper layer data stream includes H. 264, AVS, MPEG-2, MPEG-4 video stream and includes AC - 3, AAC audio stream the data stream.
5、如权利要求I所述的数字信息传输方法,其特征在于,该方法主要用于实现移动接收。 5, digital information transmission method as claimed in claim I, wherein the method is mainly used for mobile reception.
6、如权利要求I所述的数字信息传输方法,其特征在干,该方法支持单频网和多频网组网模式。 6, digital information transmission method as claimed in claim I, characterized in that the dry, which supports multi-frequency and single frequency network network construction mode.
7、如权利要求I所述的数字信息传输方法,其特征在于,该方法根据传输数据类型和组网环境选择相应的传输模式和参数。 7, a digital information transmission method as claimed in claim I, wherein the method of selecting the appropriate transmission mode and parameters according to the type of data transmission and networking environments.
8、如权利要求I所述的数字信息传输方法,其特征在于,该方法支持多种数据类型的混合传输模式。 8, the digital information transmission method as claimed in claim I, wherein the method supports multiple data types of mixed transport mode.
9、如权利要求I所述的数字信息传输方法,其特征在于,该物理逻辑信道分为控制逻辑信道和业务逻辑信道。 9, the digital information transmission method as claimed in claim I, wherein the logical channel is divided into physical and logical controls traffic logical channel.
10、如权利要求I所述的数字信息传输方法,其特征在于,该方法的信号由桢构成。 10, digital information transmission method as claimed in claim I, wherein the method consists of signal frames.
11、如权利要求10所述的数字信息传输方法,其特征在于,所述帧的长度为I秒。 11, digital information transmission method according to claim 10, characterized in that the length of the frame is I second.
12、如权利要求10所述的数字信息传输方法,其特征在于,所述的各帧包括40个长度为25毫秒的时隙。 12, digital information transmission method according to claim 10, wherein each said frame comprises 40 slots of length 25 ms.
13、如权利要求I所述的数字信息传输方法,其特征在于,所述的物理逻辑信道在I个或者多个时隙中进行传输。 13, digital information transmission method as claimed in claim I, wherein said physical logical channels for transmission I one or more slots.
14、如权利要求12所述的数字信息传输方法,其特征在于,所述时隙包括信标和OFDM符号。 14, digital information transmission method as claimed in claim 12, wherein said slot includes a beacon and an OFDM symbol.
15、如权利要求12所述的数字信息传输方法,其特征在于,所述时隙包括I个信标和5 3个OF面符号。 15, digital information transmission method as claimed in claim 12, wherein said slot includes I and beacon symbols OF surface 53 a.
16、如权利要求14所述的数字信息传输方法,其特征在于,所述信标包括发射机标识信号和同步信号。 16, digital information transmission method as claimed in claim 14, wherein said beacon comprises a transmitter identification signal and a synchronization signal.
17、如权利要求14所述的数字信息传输方法,其特征在于,所述信标包括I个发射机标识信号和2个相同的同步信号。 17, digital information transmission method as claimed in claim 14, characterized in that the beacon transmitter identification signal comprising I 2 and the same synchronization signal.
18、如权利要求16所述的数字信息传输方法,其特征在于,所述发射机标识信号由频域随机序列依次进行BPSK映射和IFFT变换后再经过周期延拓而得。 18, digital information transmission method as claimed in claim 16, characterized in that the transmitter identification signal BPSK-mapped sequentially performed IFFT transformation, and then through the extension period obtained by the frequency domain random sequence.
19、如权利要求16所述的数字信息传输方法,其特征在于,所述发射机标识信号由37点的频域随机序列进行BPSK映射并经过64点的IFFT变换后,再周期延拓26点至90点而得到。 19, digital information transmission method according to claim 16, characterized in that the transmitter identification signal BPSK-mapped by random sequence in the frequency domain after the IFFT 37 points and 64 points after conversion, then periodic extension 26 points to 90 points obtained.
20、如权利要求16所述的数字信息传输方法,其特征在于,所述同步序列通过截取频域随机序列后,依次进行BPSK和IFFT变换而得到。 20, digital information transmission method as claimed in claim 16, wherein the synchronization sequence by truncating the random sequence in the frequency domain, and the IFFT transformation BPSK sequentially obtained.
21、如权利要求20所述的数字信息传输方法,其特征在于,所述频域随机序列由线性反馈移位寄存器产生,该移位寄存器的初始值为·01110101101、生成多项式为:x"+x9+U 21, digital information transmission method according to claim 20, wherein the random sequence generated by the frequency-domain linear feedback shift register, the shift register initial value * 01110101101, generating polynomial: x "+ x9 + U
22、如权利要求21所述的数字信息传输方法,其特征在于,所述频域随机序列是通过从所述移位寄存器所产生的序列中截取314点后依次进行BPSK映射和512点IFFT变换而得。 22, digital information transmission method as claimed in claim 21, characterized in that the frequency sequentially BPSK mapping and 512 point IFFT transformed domain random sequence is taken from the 314 point by a sequence generated by the shift register derived.
23、如权利要求16所述的数字信息传输方法,其特征在于,所述发射机标识、同步序列和OFDM符号间采用带窗函数的保护间隔相交叠,所述窗函数的表达式为: 23, digital information transmission method according to claim 16, wherein the transmitter identification, synchronization between the sequence and the OFDM symbol using a guard interval overlaps with a window function, the window function is the expression:
量,T为常数,K为所述保护间隔的长度。 Amount, T is a constant, K is the length of the guard interval.
24、如权利要求23所述的数字信息传输方法,其特征在于,所述保护间隔的长度为6点。 24, digital information transmission method as claimed in claim 23, characterized in that the length of the guard interval is 6:00.
25、如权利要求14所述的数字信息传输方法,其特征在于,所述OFDM符号由OFDM符号体和循环前缀构成。 25, digital information transmission method as claimed in claim 14, wherein the OFDM symbols by the OFDM symbol and a cyclic prefix body.
26、如权利要求25所述的数字信息传输方法,其特征在于,所述OFDM符号体的长度为1024点,循环前缀的长度为128点。 26, digital information transmission method as claimed in claim 25, characterized in that the length of the OFDM symbols body 1024, a cyclic prefix of length 128 points.
27、如权利要求I所述的数字信息传输方法,其特征在于,所述RS编码是由原始的RS ( 255,M)系统码通过截短后产生的RS(240,K)截短码,其中,M=K+15,K为ー个码字中信息序列的字节数。 27, digital information transmission method as claimed in claim I, wherein said RS code is from the original RS (255, M) RS systematic code generated by the truncation (240, K) shortened code, where, M = K + 15, K is the number of bytes ー codewords information sequence.
28、如权利要求27所述的数字信息传输方法,其特征在于,所述RS (255,M)系统码的每个码元取自域GF (256),该域的生成多项式为p{x) = X8 + f + X3 + X2 + I。 28, digital information transmission method as claimed in claim 27, wherein each symbol of the RS (255, M) taken from the systematic code field GF (256), the field of the generator polynomial p {x ) = X8 + f + X3 + X2 + I.
29、如权利要求27所述的数字信息传输方法,其特征在于,所述RS (240, K)码包括4种模式,这4种模式中K的取值分别为K=240、K=224、 K=192和K=176。 29, digital information transmission method as claimed in claim 27, wherein the RS (240, K) code includes four modes, the four modes K values ​​are K = 240, K = 224 , K = 192 and K = 176.
30、如权利要求29所述的数字信息传输方法,其特征在于,所述 30, digital information transmission method as claimed in claim 29, characterized in that said
RS ( 240, K)码的生成多项式的表达式为g(x)= X見夕。 RS (240, K) code generation polynomial expression, see Xi is g (x) = X.
当K=224时,RS (240,224)的生成多项式表达式的系数g,为: When K = 224 when, RS (240,224) of the generator polynomial expression coefficients g, of:
31、如权利要求I所述的数字信息传输方法,其特征在于,所述上层数据流以字节为单位,从左至右逐列输入RS编码和字节交织器,其中,RS编码按行进行编码,字节交织器的起始字节映射在某个时隙的起始点发送。 31, digital information transmission method as claimed in claim I, wherein the upper layer data stream, in bytes, the RS encoder input column by column from left to right and byte interleaving, wherein, in a row the RS encoder encoded map byte interleaving unit start byte is transmitted in a time slot starting point.
32、如权利要求I所述的数字信息传输方法,其特征在于,所述LDPC编码后的输出块长为9216比特,码率为1/2和3/4; 其中,丄LDPC码校验矩阵生成步骤为,首先,建立如下数据矩阵: 20 6 12 18 25 300 7 19 26 31 5664·· 0 8 13 20 32 8270 16 14 21 3085 89591 15 27 33 9128 91881 9 16 34 8485 9093 2 6 28 35 4156 7760 2 10 17 7335 7545 91 382 11 22 5278 8728 8962 3 I 2510 4765 8637 8875 3 4653 4744 7541 9175 9198 3 23 2349 9012 9107 9168 4 7 29 5921 7774 8946 4 7224 8074 8339 8725 92124 4169 8650 8780 9023 9159 5 8 6638 8986 9064 9210 5 2107 7787 8655 9141 91715 24 5939 8507 8906 9173 其次,建立循环索引为I的第一猶环,其中I的取值为I至18,取上表第I行数据组成序列并记为hexp,在第一循环内嵌套循环索引为J的第二循环,其中J的取值为I至256,随后根据公式row=[( JI )*18+1]获得Ildpc码校验矩阵的行变量row,然后在第二循环所述行变量row下嵌套循环索引为K的第三循 32, digital information transmission method according to claim I, wherein said output block length of the LDPC coded bits is 9216, a code rate of 1/2 and 3/4; wherein the check matrix of the LDPC code Shang generating step, first, the data matrix established as follows: 2,061,218,253,007,192,631 5664 ·· 0,813,203,282,701,614 21 is 3,085,895,911,527,339,128 91881 9,163,484,859,093,262,835 4156 7760 2 10 17 7335 7545 91 382 11 22 5278 8728 8962 3 I 2510 4765 8637 8875 3 4653 4744 7541 9175 9198 3 23 2349 9012 9107 9168 4 7 29 5921 7774 8946 4 7224 8074 8339 8725 92124 4169 8650 8780 9023 9159 5 8 6638 8986906492105 2107 7,787,865,591,419,171,524 5,939,850,789,069,173 Secondly, a loop index I is still a first ring, wherein the value I is I to 18, taken on lines of data, table I and referred to as sequence hexp, nested loops within a first loop index J is a second cycle, wherein the value of J to I 256, and then according to the formula row = [(JI) * 18 + 1] obtained code check matrix row Ildpc variable row, then in a second cycle of the next row of nested loops variables row index for the third cycle of K 环,其中K的取值为I到6,记数据序列hexp的第K个数据为hexp (K),然后根据公式 Ring, wherein the K value of I to 6, referred to the K-th data is the data sequence hexp hexp (K), then according to the formula
获得所述-LDPC码校验矩阵;2所述2LDPC码校验姐阵生成步骤为,首先,建立如下数据矩阵: The -LDPC code check matrix is ​​obtained; 2 2LDPC the code check matrix generating step sister is, first, the data matrix established as follows:
其次,建立循环索引为I的第一循环,其中I的取值为I至9,取上表第I行数据组成序列并记为hexp,在第一循环内嵌套循环索引为J的第二循环,其中J的取值为I至256,然后根据公式row=[ ( JI )*9+1]获得2lDPC码校验矩阵的行变量row;在第二循环所述行变量row 4下嵌套循环索引为K的第三循环,其中K的取值为I到12,记数据序列hexp的第K个数据为hexp (K),然后根据公式column = Moゴ[(I hexp(K)/36 | + J -1),256]x36 + Mot/[hexp(K),36] +1 获得所述2 LDPC码校验矩阵。 Secondly, for the first cycle loop index I, where I is the value of I to 9, taken on lines of data, Table I and referred to as sequence hexp, nested within the first loop index J as a second cycle cycle in which the value of J to I 256, and then according to the formula row = [(JI) * 9 + 1] obtained line variable row 2lDPC code check matrix; a second cycle of the next row variable nested row 4 third circulation loop index is K, where K is a value of I to 12, the data referred to the K-th sequence hexp data hexp (K), and column = Mo Oligo according to the formula [(I hexp (K) / 36 | + J -1), 256] x36 + Mot / [hexp (K), 36] +1 obtain the 2 LDPC code parity check matrix. 4 4
33、如权利要求I所述的数字信息传输方法,其特征在于,所述比特交织器采用192X144的块交织器;从LDPC编码器输出的比特数据按照从上到下的顺序依次写入所述块交织器的每一行,直至填满整个块交织器,再从左到右的按列依次读出,其中比特交织器的输出与时隙对齐。 33, digital information transmission method as claimed in claim I, wherein the bit interleaver is a block interleaver uses 192X144; bit data output from the LDPC encoder are sequentially written in this order from the each row of the block interleaver, until fill the block interleaver by columns and then sequentially read from left to right, wherein the output of the bit interleaver is aligned with the slot.
34、如权利要求I所述的数字信息传输方法,其特征在于,所述星座映射采用包括BPSK、QPSK、16QAM的映射方式的其中ー种。 34, digital information transmission method as claimed in claim I, wherein said constellation mapping comprises using BPSK, QPSK, wherein ー kinds of 16QAM mapping mode.
35、如权利要求I所述的数字信息传输方法,其特征在于,所述频域符号生成步骤中,在每个OFDM符号中将78个离散导频、28个连续导频、522个数据子载波复接在一起,成为6M个有效子载波。 35, digital information transmission method as claimed in claim I, wherein said step of generating frequency-domain symbols, 78 in the scattered pilots in each OFDM symbol, 28 consecutive pilot data sub-522 carrier multiplexed together into 6M valid subcarriers.
36、如权利要求36所述的数字信息传输方法,其特征在于,所述·28个连续导频使用所述628个有效子载波中第0, 20, 32, 72,88, 128,·146, 154,156, 216, 220,250, 296, 313, 314,330, 388, 406, 410, 470, 472,·480,498,538,554, 594, 606, 627 个子载波,并在其中第20, 32, 72, 88,·128, 146, 154, 156,470, 472, 480, 498, 538, 554, 594, 606 共16 个子载波中承载16比特系统信息,所述系统信息包括长度为6比特的时隙号、长度为I比特的字节交织器同步标识、长度为I比特的控制逻辑信道变更指示和长度为8比特的保留字;所述连续导频以+ ,1 — 一"^/2一V2/2ノ'的方式映射到子载波上,其中,同一时隙内不同OFDM符号的相同连续子载波点上传输的符号相同。 36, digital information transmission method according to claim 36, wherein said continuous pilot-28 using the 628 active sub-carriers 0, 20, 32, 72 (88), 128, 146 * , 154, 156, 216, 220, 250, 296, 313, 314,330, 388, 406, 410, 470, 472, · 480,498,538,554, 594, 606, 627 subcarriers, and wherein the first 20, 32, 72, 88, - 128, 146, 154, 156,470, 472, 480, 498, 538, 554, 594, 606 subcarriers carrying a total of 16 16-bit system information, the system information includes a length of 6-bit slot number a length of I bits of the byte interleaver synchronization identifier, a length of I bits and control logical channel change instruction length of 8 bits reserved word; the continuous pilots + 1 - one " ^ / V2 a 2/2 Techno 'is mapped to the subcarriers, wherein the transmission on the same point of the same consecutive subcarriers of different OFDM symbols within the same time slot symbol.
37、如权利要求36所述的数字信息传输方法,其特征在于,当每个时隙中OFDM符号的编号为n时,OFDM符号中离散导频对应的子载波编号m取值为: 37, digital information transmission method according to claim 36, wherein, when the number of OFDM symbols per slot is n-, scattered pilot OFDM symbol corresponding to subcarrier number m of values:
离散导频全部置为1 +G人 All the scattered pilot is set to 1 + G people
38、如权利要求I所述的数字信息传输方法,其特征在于,所述扰码步骤中的所述伪随机序列的生成多项式为xu+xu+y+x6+〗;所述扰码分为8种模式,对应的寄存器初始值分别为:I )、扰码模式0:初始值0000 0000 00012)、扰码模式I:初始值0000 1001 00113)、扰码模式2:初始值0000 0100 11004)、扰码模式3:初始值0010 1011 00115)、扰码模式4:初始值0111 0100 01006)、扰码模式5:初始值0000 0100 11007)、扰码模式6:初始值0001 0110 11018)、扰码模式7:初始值0010 1011 0011所述伪随机序列在每个时隙的开头重置,所有时隙都被相同图样扰码。 38, digital information transmission method as claimed in claim I, wherein the scrambling sequence generator polynomial a pseudo random code step is xu + xu + y + x6 +]; the scrambling codes are divided into 8 modes corresponding register initial values ​​of: the I), scrambling mode 0: initial value 0000000000012), scrambling mode I: initial value 0000100100113), scrambling mode 2: initial value 0,000,010,011,004), scrambling mode 3: initial value 0010101100115), scrambling mode 4: initial value 0111010001006), scrambling mode 5: initial value 0000010011007), scrambling mode 6: initial value 0001011011018), scrambling code mode 7: 001010110011 said pseudo-random sequence initial value at the beginning of each time slot is reset, all the slots are the same scramble code pattern.
39、如权利要求I所述的数字信息传输方法,其特征在于,所述IFFT变换步骤是将628个有效子载波放在1024个子载波的第I ~ 314和第710 ~ 1023子载波上后进行1024点IFFT变换。 39, digital information transmission method as claimed in claim I, wherein said step of IFFT transformation is placed 628 1024 active subcarriers of subcarriers and the I - 314 for 710 to 1023 after the second subcarriers 1024 point IFFT transformation.
40、如权利要求I所述的数字信息传输方法,其特征在于,所述时域组帧步骤是将调制后的oroM符号依次加入保护间隔、同步信号、发射机识别信号后组成时隙,再将40个时隙连接组成物理层信号帧。 40, digital information transmission method as claimed in claim I, wherein said step of time domain framing is modulated symbols oroM guard interval is added successively to form the slot synchronization signal, a transmitter identification signal, and then the slots 40 connected to form a physical layer signal frame.
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