CN101018105B - A classified modulating mobile digital multimedia broadcast signal transmission system and method - Google Patents

A classified modulating mobile digital multimedia broadcast signal transmission system and method Download PDF

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CN101018105B
CN101018105B CN2006101319965A CN200610131996A CN101018105B CN 101018105 B CN101018105 B CN 101018105B CN 2006101319965 A CN2006101319965 A CN 2006101319965A CN 200610131996 A CN200610131996 A CN 200610131996A CN 101018105 B CN101018105 B CN 101018105B
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signal transmission
transmission system
digital multimedia
encoder
mobile digital
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CN101018105A (en
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北京创毅讯联科技股份有限公司
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Abstract

The invention discloses a mobile digital multimedia broadcast signal transmission system comprising: two groups of channel decoders respectively receiving a first and a second groups of data flows and transforming bit flows after coding and interleaving treatment to the data flows; a constellation mapper used for combining the two groups of bit flows output by the two groups of channel decoders and mapping into QAM mode signal flows, allocating two bits with maximal energy to the first group of data flows, and allocating other bits with low energy to the second group of data flows, and increasing the energy of the two bits with the maximal energy; an OFDM signal forming module used for forming OFDM signals according to the signals formed by the constellation mapper; a framing module used for adding beacon into the OFDM signals and forming transmission frame; an up-conversion module used for up conversing the transmission frame and generating RF signal to be transmitted. The invention can provide data transmission with different quality grades for different service demands.

Description

一种分级调制移动数字多媒体广播信号传输系统和方法 A hierarchical modulation mobile digital multimedia broadcasting signal transmitting system and method

技术领域 FIELD

[0001] 本发明涉及移动数字多媒体广播领域,尤其涉及一种移动数字多媒体广播中信号传输系统和方法。 [0001] The present invention relates to a mobile digital multimedia broadcasting, and more particularly relates to a mobile digital multimedia broadcast signal transmission system and method.

[0002] 技术背景 [0002] BACKGROUND OF THE INVENTION

[0003] 正交频分复用(OFDM)是一种公知的多载波调制方法,其主要思想是:将信道分成若干正交子信道,将高速数据信号转换成并行的低速子数据流,调制到在每个子信道上进行传输。 [0003] Orthogonal Frequency Division Multiplexing (OFDM) is a well-known multicarrier modulation method, the main idea is: The channel is divided into a plurality of orthogonal sub-channel, high-speed data signal into parallel low-speed sub-data stream, the modulator to be transmitted on each subchannel. 正交信号可以通过在接收端采用相关技术来分开,这样可以减少子信道之间的相互干扰ICI。 Quadrature signals at the receiving end can be employed to separate the related art, thus reducing the mutual interference ICI between subchannels. 每个子信道上的信号带宽小于信道的相关带宽,因此每个子信道上的可以看成平坦性衰落,从而可以消除符号间干扰。 Of the signal bandwidth of each subchannel is less than the coherence bandwidth of the channel, and therefore can be regarded as flat fading on each sub-channel, thereby eliminating inter-symbol interference. 而且由于每个子信道的带宽仅仅是原信道带宽的一小部分,信道均衡变得相对容易。 And because each subchannel bandwidth of only a small part of the original channel bandwidth, channel equalization becomes relatively easy. OFDM目前已被用于数种无线系统标准中,譬如欧洲数字音频和数字视频广播系统(DAB、DVB-T、DVB-H)、5GHz高数据速率无线LAN(IEEE802. Ila, HiperLan2, MMAC)系统等。 OFDM has been used for several wireless system standards, such as European digital audio and digital video broadcasting system (DAB, DVB-T, DVB-H), 5GHz high data rate wireless LAN (IEEE802. Ila, HiperLan2, MMAC) Systems Wait.

[0004] 在目前一些采用了OFDM的多媒体广播系统中,还存在一些缺陷和不尽人意的地方。 [0004] In some current multimedia broadcast system using OFDM, there are some limitations and undesirable places. 移动多媒体广播是针对手持终端的移动传输系统,主要的挑战是设计支持低功耗、高动态终端设备接收各种速率及类型数据流,而现有技术中的多媒体广播系统仅仅对数据流使用统一的编码速率和交织方式进行处理,这样一来,当接收机所处环境信号不好的时候只能通过增大接收机功耗的途径来解决多媒体数据譬如图像的质量问题,而且不能根据不同的服务需求来提供不同质量等级的数据传输;另外,在一些多媒体广播系统的帧结构中没有独立的同步信号设计,增长了接收机的同步时间和同步精度;再者,在这些广播系统中扰码设计只有一种,也不利于单频组网。 Mobile multimedia broadcasting is a transmission system for mobile handheld terminals, the main challenge is designed to support low-power, high-speed dynamic terminal device and receives various types of data stream, whereas the prior art system using only a unified multimedia broadcasting data stream the coding rate and processed in an interleaved manner, so that, when a bad environment in which a receiver signal can be resolved only when multimedia data such as image quality by way of increasing the power consumption of the receiver, and not depending on the to provide a data transmission service needs different quality levels; Further, no separate synchronization signal design, and increased synchronization time synchronization accuracy in the frame structure of the receiver some multimedia broadcast system; Furthermore, in the broadcasting scrambling systems design is only one, is not conducive to single-frequency network.

[0005] 为解决包括上述问题再内的诸多缺陷,需要一个更好的移动数字多媒体广播传送方案。 [0005] In order to solve the problems described above comprises many defects in the re-requires a better transmission scheme mobile digital multimedia broadcasting.

发明内容 SUMMARY

[0006] 有鉴于此,本发明的目的在于提供一种移动数字多媒体广播系统中信号通讯的传送系统和方法。 [0006] In view of this, an object of the present invention is to provide a mobile digital multimedia broadcasting system and method for transmitting a signal communication system.

[0007] 为了达到上述目的,本发明提供方案如下: [0007] To achieve the above object, the present invention provides the following:

[0008] 一种移动数字多媒体广播信号传输系统,其特点在于,其包括: [0008] A mobile digital multimedia broadcasting signal transmission system, characterized in that it comprises:

[0009] 两组信道编码器,分别接收第一、第二组数据流并将数据流经编码和交织处理后转换为比特流; [0009] The two groups of channel encoder, receiving the first, is converted into a second set of bit stream data streams and data stream encoding and interleaving process;

[0010] 星座映射器,用于将所述两组信道编码器输出的两组比特流结合后映射为QAM模式的符号流,将其中能量最大的两比特分配给第一组数据流,将其他低能量比特分配给第二组数据流,并增加能量最大的两比特的能量; [0010] The constellation mapper for mapping the bit stream after the binding of the two sets of channel encoder output symbol stream to QAM mode, in which the two maximum energy allocated to the first group of data bit stream, the other low energy allocated to the second set of data bit stream, and to increase the energy of the maximum energy of the two bits;

[0011] OFDM符号形成模块,用于根据所述星座映射器形成的符号流形成OFDM符号; [0011] OFDM symbols forming means for forming the stream of OFDM symbols according to the symbol constellation mapper formed;

[0012] 成帧模块,用于将所述OFDM符号加入信标以形成传输帧; [0012] The framing module, for the added OFDM symbols to form a transmission frame beacon;

[0013] 上变频模块,用于对所述传输帧进行上变频以产生用于发射的射频信号。 [0013] The up-conversion module for upconverting the radio frequency signal to generate a transmission frame for transmission. [0014] 进一步地,上述QAM模式是16QAM或64QAM模式; [0014] Further, the QAM mode is 16QAM or 64QAM mode;

[0015] 进一步地,在上述QAM模式为16QAM模式时,比特顺序为b0bll32b3,将bObl分配给第一组数据流,将l32b3分配给第二组数据流; When [0015] Further, in the above-described QAM mode is 16QAM mode, the bit order of b0bll32b3, the bObl assigned to a first group of data streams assigned to a second group l32b3 data stream;

[0016] 进一步地,所述每一个信道编码器都包括有外编码器、外交织器、内编码器及内交织器,第一、二组数据流依次经过外编码器、外交织器、内编码器及内交织器处理后输出; [0016] Further, each of the channel encoder comprises an outer encoder, an outer interleaver, inner encoder and an inner interleaver, the first and second set of data flows sequentially through the outer encoder, an outer interleaver, the encoder and interleaver outputs the processed;

[0017] 进一步地,所述每一个信道编码器具有不同的编码速率和交织方式; [0017] Further, each of the channel encoder having a coding rate and different interleaving mode;

[0018] 进一步地,所述的两路信道编码器不同,并且每路信道编码器只包括外编码器、外交织器、内编码器及内交织器中的部分单元; [0018] Furthermore, two different paths of the channel encoder, and each port of the channel encoder comprises only an outer encoder, an outer interleaver, interleaving the encoder and the inner part of the reactor unit;

[0019] 进一步地,所述外编码器采用二进制BCH码或RS码; [0019] Further, the outer encoder binary BCH code or an RS code;

[0020] 进一步地,所述外交织器只针对RS码的校验符号进行交织,不对RS码的信息符号进行交织; [0020] Further, only the outer interleaver for interleaving the RS code check symbols, the information symbol interleaving the RS code does not;

[0021] 进一步地,所述内编码器采用LDPC码或QC-LDPC码; [0021] Further, the encoder uses the LDPC code or QC-LDPC code;

[0022] 进一步地,所述OFDM符号形成模块的子载波和数据以及导频的对应关系为:(1) 当信道带宽位为8MHz时,有效子载波编号为0〜3075或当信道带宽位为2MHz时,有效子载波编号为0〜627 ; (2)插入离散导频,在偶数OFDM符号中,从0开始,编号满足8¾形式的有效子载波为离散导频,其中K为整数;在奇数OFDM符号中,编号满足8*K+4形式的有效子载波为离散导频,其中K为整数;C3)加入连续导频;(4)进行调制,有效子载波0〜3075 分别对应IFFT变换中的-1537〜1538,或0〜627分别对应IFFT变换中的-313〜314 ; [0022] Further, the data subcarriers and the OFDM symbols and the correspondence between the pilot module is formed as follows: (1) When the bit is channel bandwidth 8MHz, subcarrier number is valid or when the channel bandwidth 0~3075 bit when 2MHz, the effective subcarrier number of 0~627; (2) inserting scattered pilots in even-numbered OFDM symbols beginning from zero, the effective number of forms to meet 8¾ scattered pilots subcarriers, where K is an integer; in the odd OFDM symbols, numbers satisfy 8 * K + 4 effectively form discrete pilot subcarriers, where K is an integer; a C3) was added continuous pilot; (4) modulating the effective subcarriers corresponding to IFFT transformation, respectively 0~3075 the -1537~1538, or 0~627 respectively -313~314 IFFT transforms;

[0023] 进一步地,所述离散导频增加2_4dB发射功率; [0023] Further, the scattered pilots 2_4dB increased transmission power;

[0024] 进一步地,所述信标包括两个相同的同步信号及发射机标识信号。 [0024] Furthermore, the beacon signal comprises two identical synchronization and transmitter identification signals.

[0025] 本发明通过采用双路输入分级调制的方式,在对QAM调制中将能量最大的两个比特或四个比特和其余比特分开,分别调制不同的码流,这两个码流可以有不同的编码速率和交织方式,同时还可以增加能量最大的两个比特的能量针对不同能量的数据码流进行不同的调制,使得接收机能达到更好的接收效果,并可为不同的服务需求提供不同质量等级的数据传输;再者,信标结构中同步信号的插入加快了接收机的同步速度和精度并且可用于信道估计;还有,本发明在离散导频中有选择的增加发射功率用于提高接收机信道估计的性能,使得接收端的信道估计更准确,接收端的解调性能也提高很多。 [0025] The present invention uses a two input hierarchical modulation mode, and the remaining bits in the QAM modulation separated maximum energy of two bits or four bits, respectively, different modulation stream, the two streams can be different encoding rates and interleaved manner, while also increasing the maximum energy of two different energies bits for modulation of the data streams of different energy, so that the receiver can achieve better reception, and provide services for different needs different levels of quality of data transmission; Furthermore, the insertion synchronizing signal beacon formation accelerates the speed and accuracy of the synchronization of the receiver and may be used for channel estimation; Further, the present invention selectively increase the transmission power of a scattered pilot in to improve the channel estimation performance of the receiver, so that the receiving side more accurate channel estimate, the receiver demodulation performance increased a lot.

[0026] 下面参照附图和实施例来对本发明和包括但不限于上述的诸多优点进行更为详细的说明。 [0026] Referring to the drawings and embodiments of the present invention and include, but are not limited to the advantages described in more detail pair.

[0027] 附图说明 [0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 图1是本发明移动数字多媒体广播信号传输系统的一种实施方式的方框示意图; [0028] FIG. 1 is a block diagram of an embodiment of a mobile digital multimedia broadcasting signal transmission system of the present invention;

[0029] 图2是本发明移动数字多媒体广播信号传输系统的信道编码模块的方框图; [0029] FIG. 2 is a block diagram of the channel coding module according to the present invention, a mobile digital multimedia broadcasting signal transmission system;

[0030] 图3A、3B分别是16QAM和64QAM模式星座映射示意图; [0030] FIGS. 3A, 3B are 16QAM and 64QAM constellation mapping model schematic;

[0031] 图4是数据子载波、离散导频和连续导频在OFDM符号的子载波分配图; [0031] FIG. 4 is a data subcarrier, pilot subcarrier allocation FIGS discrete pilot and a continual pilot in the OFDM symbol;

[0032] 图5是线性反馈移位寄存的具体结构; [0032] FIG. 5 is a specific configuration of the linear feedback shift register;

[0033] 图6是~ = 8MHz时的OFDM子载波结构图; [0033] FIG. 6 is a configuration diagram of the OFDM subcarriers at ~ = 8MHz;

[0034] 图7是~ = 2MHz时的OFDM子载波结构图; [0034] FIG. 7 is a ~ = OFDM subcarrier structure view of 2MHz;

[0035] 图8是时隙划分和帧结构图; [0035] FIG 8 is a frame structure and slot allocation;

[0036] 图9是信标结构;[0037] 图10是OFDM符号的结构图; [0036] FIG. 9 is a beacon structure; [0037] FIG. 10 is a structural view of OFDM symbols;

[0038] 图11是RS编码与交织结构图。 [0038] FIG. 11 is a configuration diagram of RS coding and interleaving.

具体实施方式 Detailed ways

[0039] 根据本发明的一个方面,本发明提出了一种移动数字多媒体广播信号传输系统的一种实施方式,具体请参考图1所述。 [0039] In accordance with one aspect of the present invention, the present invention provides a embodiment of a mobile digital multimedia broadcasting signal transmission system, the specific reference to FIG 1. 总体来讲,所述移动数字多媒体广播信号传输系统包括两组信道编码器10、11、星座映射器20、0FDM符号形成模块30、成帧模块40、上变频模块50。 In general, the mobile digital multimedia broadcast signal transmission system comprises two sets of channel coder 10, 11, 20,0FDM symbol constellation mapper module 30 the framing module 40 is formed, on the up-conversion module 50. 所述两组信道编码器10、11分别接收第一、第二组数据流并将数据流经编码和交织处理后转换为比特流。 The two groups of channel coder 10 and 11 respectively receive the first and second set of data streams and encoded and interleaved data streams are converted into a bit stream processing. 所述星座映射器20用于将所述两组信道编码器输出的两组比特流结合后映射为QAM模式的符号流。 The constellation mapper 20 groups of bits for the two groups of channel encoder output stream combination to the mapped QAM symbol stream mode. 所述OFDM符号形成模块30用于根据所述星座映射器形成的符号流形成OFDM符号。 30 the OFDM symbols forming module for forming a stream of OFDM symbols according to the symbol constellation mapper formed. 所述成帧模块40用于将所述OFDM符号加入信标以形成传输帧。 The framing module 40 OFDM symbols for the beacon was added to form a transmission frame. 所述上变频模块50用于对所述传输帧进行上变频以产生用于发射的射频信号。 The conversion module 50 for performing frequency conversion on the RF signal to generate a transmission frame for transmission.

[0040] 根据本发明的另一个方面,本发明提出了一种移动数字多媒体广播信号传输方法的一种实施方式,所述一种移动数字多媒体广播信号传送方法,包括:a)分别接收第一、第二组数据流并将数据流经编码和交织处理后转换为比特流;b)将所述两组信道编码器输出的两组比特流结合后映射为QAM模式的符号流;c)根据所述星座映射器形成的符号流形成OFDM符号;d)将所述OFDM符号加入信标以形成传输帧;e)对所述传输帧进行上变频后发射。 [0040] According to another aspect of the present invention, the present invention proposes a method for transmitting one embodiment of a mobile digital multimedia broadcasting signal, a digital multimedia broadcasting in a mobile signal transmission method, comprising: a) receiving respectively a first a second set of data flows and data flows and the interleaved coded bit stream converting a processed; b) two groups of bit streams mapped to the combined two sets of channel encoder output symbol stream to QAM mode; c) the the constellation mapper symbol stream formed by forming an OFDM symbol; D) was added to the beacon OFDM symbol to form a transmission frame; E) after transmitting the transmission frame upconverting.

[0041] 以下主要依照信号流的传递顺序依次对每个功能模块的具体实施方式进行详细描述。 [0041] In accordance with the primary sequence of the signal stream transmitted sequentially detailed description of the specific embodiments of each function module.

[0042] 1. 1信道编码 [0042] 1.1 channel coding

[0043] 具体请参看图2,每个信道编码器都包括有外编码器101、外交织器102、内编码器103及内编码器104,第一、二组数据流依次经过外编码器、外交织器、内编码器及内编码器处理后输出。 [0043] Referring specifically to Figure 2, each channel encoder comprises an outer encoder 101, an outer interleaver 102, the encoder 103 and the encoder 104, the first and second set of data flows sequentially through the outer encoder, an outer interleaver, after the encoder and the encoder output processing. 所述第一组数据流和第二组数据流可以是由同样的数据分流而成,其中组数据流代表能量最大的两比特,第二组数据流代表其他低能量比特。 The first set of data flows and the second set of data from the stream may be split from the same data, two bits of which the maximum energy stream represents the set of data, the second set of data bit stream representative of other low energy. 在一个具体的实施例中, 所述数据流可以是视频数据流。 In a specific embodiment, the data stream may be video data stream.

[0044] 1. 1. 1外编码及外交织 [0044] 1.1.1 outer encoder and an outer interleaver

[0045] 所述外编码器可以采用二进制BCH码或RS码。 The [0045] outer encoder binary BCH code or the RS code may be used. 二进制BCH码可以采用(255,231) 的截短码O40,216)。 Binary BCH codes can be employed (255,231) of the shortened code O40,216). RS码可以采用码长为240字节的RS(M0,K)截短码,该码由原始的RS(255,M)系统码通过截短产生,其中M = K+15。 RS code may be employed as the code length of 240 bytes of RS (M0, K) shortened code, the code from the original RS (255, M) is generated by truncation systematic code, where M = K + 15. RS(240,K)码提供4种模式,分别为K = 240,K = 224,K = 192,K = 176。 RS (240, K) code to provide 4 modes, respectively, K = 240, K = 224, K = 192, K = 176.

[0046] 截短码(Μ0,Κ)可以采用如下方式进行编码:在K个输入信息字节Ovm1,…,Htl) 前添加15个全“0”字节,构造为原始的(255,M)系统码的输入序列(0,…0,叫,Hi1,…, IV1),编码后生成码字(0,…Ο,ινιν…,ITtl,Ptl,Pl,…,P255^1),再从码字中删去添加的字节,即得到240字节的截短码Ovm1, -,Iii^1, P0, P1,…,P255I1K [0046] The shortened code (Μ0, Κ) may be encoded in the following way: the K input information bytes Ovm1, ..., 15 Add all "0" bytes Htl) prior to the original configuration (255, M ) input sequence systematic code (0, ... 0, called, Hi1, ..., IV1), generating a codeword (0 encoded, ... Ο, ινιν ..., iTtl, Ptl, Pl, ..., P255 ^ 1), then from deleting codeword byte added to obtain 240 bytes shortened code Ovm1, -, Iii ^ 1, P0, P1, ..., P255I1K

[0047] 外交织器结构可以为块交织器,外交织器的列数可以固定为Μ0,交织深度由行数M1确定。 Sequence [0047] The outer interleaver structure may be a block interleaver, the outer interleaver may be fixed Μ0, interleaving depth is determined by the number of rows M1.

[0048] 当~ = 8MHz时,外交织器的行数由系统指定的字节交织模式和内编码器的LDPC 码率决定;当Bf = 2MHz,外交织器的行数由星座映射模式和内编码器的LDPC码率,如下表一所示。 [0048] When ~ = 8MHz, the number of rows outer interleaver specified by the system's byte interleaving pattern and an inner LDPC encoder code rate decision; when Bf = 2MHz, the number of rows from the outer interleaver and the constellation mapping mode LDPC encoder rate, a shown in the following table. 外交织器参数MI,其中,~表示基带带宽。 An outer interleaver parameters MI, wherein ~ represents the baseband bandwidth.

[0049] 表一 [0049] Table I

[0050] [0050]

Figure CN101018105BD00071

[0051] 由此可以看出,在外交织时增加了更短的交织选项,这样可以减低接收的memory 需求,同时降低功耗。 [0051] It can be seen, increasing the shorter outer interleaver interleaving option, which can reduce memory requirements received, while reducing power consumption.

[0052] 1.1. 2内部编码及交织 [0052] 1.1. 2 internal code and interleave

[0053] 内编码器可以采用LDPC码或QC-LDPC码,编码配置如表二所示。 [0053] The encoder may be employed within LDPC code or QC-LDPC code, encoding the configuration as shown in Table II.

[0054]表二 [0054] Table II

[0055] [0055]

Figure CN101018105BD00072

[0056] LDPC输出码字C = {c0, C1,…,C921J由输入信息比特S = {s0, S1,…,sK_J和校验比特P = {p0, P1,…,P9215J组成如下: [0056] LDPC output code word C = {c0, C1, ..., C921J by the input information bits S = {s0, S1, ..., sK_J and parity bits P = {p0, P1, ..., P9215J the following composition:

Figure CN101018105BD00073

[0057] cC0L0RDmi) = ^站赛9216-Λ: </<9215 [0057] cC0L0RDmi) = ^ Station Race 9216-Λ: </ <9215

[0058] 1/2LDPC块的信息比特对应于3个188字节的TS包,3/4LDPC块的信息比特对应于4. 5个188字节的TS包。 Information bits [0058] 1 / 2LDPC block 188 corresponds to the three-byte TS packet, the information bits 3 / 4LDPC block corresponds to 4.5 188 byte TS packets.

[0059] 内编码器还可以采用QC-LDPC编码,因为QC-LDPC码的性能与普通LDPC码的性能相当或略低,但是有很低的实现复杂度。 [0059] The encoder may also be employed within the QC-LDPC code, because the performance of QC-LDPC code performance LDPC code quite ordinary or slightly lower, but has a very low implementation complexity. 其译码实现的复杂度只有普通LDPC码译码复杂度的1/4,甚至更低。 Implementation complexity decodes only normal LDPC code decoding complexity 1/4, or even lower. 而LDPC译码在接收端的解调电路中占有1/3左右的比重,简化LDPC译码对接收端的成本和功耗有非常大的意义。 LDPC decoding the proportion occupies about 1/3 in the demodulation circuit of the receiving end, a simplified LDPC decoder has a very large significance for the cost and power consumption of the receiving end. 目前大部分采用LDPC的无线通信和广播系统基本上都采用QC-LDPC码。 Currently, most wireless communication using LDPC and broadcasting systems basically using QC-LDPC code.

[0060] LDPC编码后的比特输入内交织器进行交织。 [0060] the LDPC encoded input bit interleaver interleaves. 内交织器采用MbX Ib的块交织器,Mb 和Ib的取值如表三所示。 The interleaving uses a block interleaver MbX Ib, Ib and Mb of the values ​​shown in Table III.

[0061] 表三 [0061] Table III

[0062] [0062]

Figure CN101018105BD00081

[0063] 内交织器的输出与时隙同步,即时隙中传送的第一个比特始终定义为比特交织器输出的第一个比特。 Interleaver [0063] the output of the synchronization slot, the first slot transmission bit immediate is always defined as the first bit output from the bit interleaver.

[0064] 内交织块可以采用近似方形的设计可以降低接收机解交织时的内存需求。 Interleaved block [0064] the approximately square design can be used to reduce memory requirements at the receiver deinterleaver.

[0065] 1. 2星座映射 [0065] constellation mapping 1.2

[0066] 所述星座映射器用于将所述两组信道编码器输出的两组比特流结合后映射为QAM 模式的符号流。 The [0066] constellation mapper for mapping mode to QAM symbol stream after the stream of bits of the two sets combined channel encoder output. 所述QAM模式是16QAM、64QAM或256QAM模式。 The QAM mode is 16QAM, 64QAM or 256QAM mode. 针对不同服务要求利用分级调制提供不同等级的质量。 For different quality of service requirements to provide different levels of use of hierarchical modulation. 由于第一组数据流代表能量最大的两比特,第二组数据流代表其他低能量比特,请具体参看图3A所示,在QAM模式为16QAM模式时,比特顺序为b0blb2b3,可以将bObl分配给第一组数据流,将l32b3分配给第二组数据流;请具体参看图3B所示,在QAM模式为64QAM模式时,比特顺序为b0blb2b;3b4b5,可以将bObl分配给第一组数据流,b2b;3b4l35分配给第二组数据流;在QAM模式为256QAM模式时,将bObl分配给第一组数据流,将b2b3b4b5b6b7b8b9bl0bllbl2bl3bl4bl5分配给第二组数据流。 Since the first set of data representative of the maximum energy of the stream of two bits, the second set of data bit stream representative of other low energy, please referring specifically to FIG. 3A, the QAM mode is the 16QAM mode, the bit order of b0blb2b3, bObl can be assigned a first set of data flows, assigned to the second group of data l32b3 stream; please specifically illustrated with reference to Figure 3B, when the mode is the 64QAM QAM mode, the bit order of b0blb2b; 3b4b5, bObl may be assigned to a first set of data flows, b2b; 3b4l35 allocated to the second set of data flows; QAM mode when the mode is 256QAM, the bObl assigned to a first group of data stream, will be assigned to a second group b2b3b4b5b6b7b8b9bl0bllbl2bl3bl4bl5 data stream. 另外星座映射器还可以采用BPI、QPSK模式。 Further constellation mapper may also be employed BPI, QPSK mode.

[0067] 各种符号映射加入功率归一化因子(QPSK的归一化因子4Ϊ,16QAM的归一化因子VlO,64QAM的归一化因子见),使各种符号映射的平均功率趋同。 [0067] The mapped symbols added power normalization factor (QPSK normalization factor 4Ϊ, 16QAM normalization factor VlO, see 64QAM normalization factor) is the average power of the symbols mapped convergence.

[0068] 至此可以看出,在本发明中对16QAM和64QAM调制中能量最大的两个比特和其余比特分开,分别调制不同的码流,这两个码流可以有不同的编码速率和交织方式。 [0068] Thus it can be seen, for 16QAM and 64QAM modulation, two bits of highest energy and the remaining bits are separated in the present invention, each modulating different streams, the two streams may have different coding rate and interleaving manner . 同时可以增加16QAM和64QAM调制中能量最大的两个比特的能量。 While increasing the 16QAM and 64QAM modulation, two bits of the highest energy energy. 首先按照通常方式进行16QAM或64QAM调制,然后对I路信号和Q路信号(请参阅图2和图幻的幅度分别增加一个数值1 或者3 (假设16QAM的I或Q的幅度为1、3,64QAM的I或Q的幅度为1,3、5、7),正负号不变。这样,可以为不同的服务需求提供不同质量等级的数据传输。 16QAM or 64QAM modulation is first carried out in the usual way, and then I signal and Q signal (see FIG. 2 and FIG amplitude magic increased amplitude value of a 1 or 3 (assuming 16QAM I or Q is 1,3, the amplitude of I or Q is 1,3,5,7 64QAM), the same sign. in this way, the data transmission may be provided different levels of quality of service for different needs.

[0069] 1.30FDM 符号形成 [0069] 1.30FDM symbols form

[0070] 所述OFDM符号形成模块40将离散导频及连续导频插入星座映射模块输出的符号流后,加载到有效子载波形成OFDM符号。 [0070] The module 40 is formed of the OFDM symbols after the scattered pilot and a continual pilot pilot insertion symbol stream output from the constellation mapping module, loaded into the effective subcarriers forming an OFDM symbol. 星座映射模块输出的符号流被加载到有效子载波后形成数据子载波。 After the symbol streams output by the constellation mapping module is loaded into the active subcarriers forming a data subcarrier.

[0071 ] 每个OFDM符号包括Nv个有效子载波,Nv取值为: [3076' Bf=SMHz [0071] Each OFDM symbol includes a valid subcarriers Nv, Nv value of: [3076 'Bf = SMHz

[0072]叫 628,Bf=IMHz [0072] called 628, Bf = IMHz

[0073] 记每个时隙中第η个OFDM符号上的第i个有效子载波为Xn(i),i = 0,1,…Nv-I ; 0 < η < 52。 [0073] referred to the i-th active subcarriers in each time slot on the first OFDM symbol is [eta] Xn (i), i = 0,1, ... Nv-I; 0 <η <52. OFDM符号的子载波按照图4所示方式分配给数据子载波、离散导频和连续导频。 Subcarriers of the OFDM symbols allocated in the manner shown in FIG 4 the data subcarriers, scatter pilot and a continual pilot.

[0074] 1. 3. 1连续导频 [0074] 1.3.1 Continuous Pilot

[0075] Bf = 8MHz时,每个OFDM符号中包括附个连续导频Jf = 2MHz时,每个OFDM符号包括N2个连续导频。 When 8MHz [0075] Bf =, each OFDM symbol comprising a continuous pilots attachment when Jf = 2MHz, each OFDM symbol includes pilot continuous N2.

[0076] 部分连续导频用于传送传输参数信令,调制方式为BPSK,传输参数信令包括时隙号,字节交织器同步标识,配置变更指示,前后保护长度选项,外部编码和交织选项,内部编码和交织选项,离散导频选项等。 [0076] The portion of the continuous pilots for transmitting transmission parameter signaling, the modulation scheme is BPSK, includes a transmission parameter signaling time slot number, the byte interleaver synchronization identification, the configuration change instruction, protection options longitudinal length, outer coding and interleaving option internal coding and interleaving option, scattered pilot options.

[0077] 1. 3. 2离散导频 [0077] 1.3.2 scattered pilot

[0078] 离散导频发送已知符号l+0j。 [0078] transmit a known scattered pilot symbol l + 0j. 每个时隙中第n个OFDM符号中离散导频对应的子载波编号m取值规则如下: Each slot n-th OFDM symbol number m of scattered pilot subcarrier frequency value corresponding to the following rules:

[0079] Bf = 8MHz : [0079] Bf = 8MHz:

[0080] [0080]

Figure CN101018105BD00091

[0081]选项 [0081] Options

Figure CN101018105BD00092

[0082] [0082]

[0083] [0083]

[0084] 选项2的插入方式可以简化接收端离散导频插值滤波器的设计。 Insert Mode [0084] Option 2 may be simplified received scatter pilot interpolation filter design end.

[0085] Bf = 2MHz : [0085] Bf = 2MHz:

[0086] [0086]

Figure CN101018105BD00093

[0087] [0088] 离散导频可以有选择的増加2-4dB发射功率用于提高接收机信道估计的性能,可以使接收端的信道估计更准确,使接收端的解调性能提高0. 5dB以上。 [0087] [0088] The scattered pilot can selectively 2-4dB of increase in transmit power for improving channel estimation performance of the receiver, the receiving end can make a more accurate estimate of the channel, so that demodulation performance of the receiving end of more than 0. 5dB improvement.

[0089] 1. 3. 3数据子载波 [0089] 1. Data subcarriers 3.3

[0090] 每个OFDM符号中除离散导频和连续导频外的子载波为数据子载波。 [0090] Each OFDM symbol except scatter pilot and a continual pilot sub-carrier frequency for data subcarriers outside. 数据子载波按照子载波、OFDM符号的前后順序传输星座映射后的数据符号。 Before and after the data subcarriers in accordance with sub-carrier, OFDM symbol of the data symbols transmitted in the order constellation mapping. 每个时隙中共有138330 (Bf =8MHz)或27666 (Bf = 2MHz)个数据子载波,其中前138240 (Bf = 8MHz)或27648 (Bf = 2MHz)个子载波用于承载星座映射后的数据复符号,最后90 (Bf = 8MHz)或18 (Bf = 2MHz) 个符号填充0+0 j。 Each slot consensus 138330 (Bf = 8MHz) or 27666 (Bf = 2MHz) data subcarriers, wherein the front 138240 (Bf = 8MHz) or 27648 (Bf = 2MHz) subcarriers for the data carrier multiplexing constellation mapping symbol, and finally 90 (Bf = 8MHz) or 18 (Bf = 2MHz) filled symbols 0 + 0 j.

[0091] 1.3. 4 扰码 [0091] 1.3. Scrambler 4

[0092] 对数据子载波、离散导频和连续导频等,均被ー个复伪随机序列P。 [0092] The data subcarriers, scatter pilot and a continual pilot and so on, are a complex pseudo-random sequence ー P. (i)扰码。 (I) scrambling code.

[0093] 复伪随机序列Pc (i)生成方式如下: [0093] The complex pseudo-random sequence Pc (i) generated as follows:

[0094] [0094]

Figure CN101018105BD00094

[0095] 其中,Si(I)和民⑴为十二位移位寄存器产生伪随机序列,由图5所示线性反馈移位寄存器产生,对应生成多项式为ュ12+?+/+16+1。 [0095] wherein, Si (I) and China ⑴ twelve bit shift register generates a pseudo-random sequence generated by a linear feedback shift register shown in FIG. 5, the corresponding generator polynomial is ュ 12 +? + / + 16 + 1. 移位寄存器的初始值提供8种不同选项,如表四所示: The initial value of the shift register 8 different options, as shown in Table 4:

[0096] 扰码移位寄存器初始值 [0096] scrambling code shift register initial value

[0097] 表四 [0097] Table IV

[0098] [0098]

Figure CN101018105BD00095
Figure CN101018105BD00101

[0099] 扰码的线性反馈移位寄存的具体结构请参考图5。 [0099] a linear feedback shift register scrambling code specific configuration Please refer to FIG 5. 扰码通过将有效子载波上的复符号和复伪随机序列P。 The complex symbols by the scrambling code on the active subcarriers and complex pseudo-random sequence P. (i)进行复数乘法实现。 (I) performing a complex multiplication realized. 单频组网时,服务区内的相邻发射机采用不同扰码对数据加扰,利用发射机标识信号和扰码信息有利于接收机选择“最佳”发射机发射的信号进行接收。 Single frequency networking, the adjacent transmitters within the service area using different scrambling codes scramble data using the identification signal transmitter and the receiver facilitate scrambling code information to select the "best" signal transmitted by the transmitter are received.

[0100] 1. 3. 4 OFDM 调制载波 [0100] 1. 3. 4 OFDM modulated carrier

[0101] 插入导频并扰码后OFDM子载波Yn(i),0彡i彡Ns通过IFT映射为OFDM符号: [0101] After the insertion guide and scrambled pilot OFDM subcarriers Yn (i), 0 i San San Ns OFDM symbols mapped by IFT:

[0102] [0102]

Figure CN101018105BD00102

[0103]其中: [0103] wherein:

[0104] 为时隙中第η个OFDM符号 [0104] The slot of OFDM symbol η

[0105] Ns为OFDM符号子载波数,取值为: [0105] Ns is the number of subcarriers of OFDM symbols, values:

[0106] [0106]

Figure CN101018105BD00103

[0107] (Af)s为OFDM符号的子载波间隔,取值为2. 44140625kHz。 [0107] (Af) s subcarriers of OFDM symbols, the value is 2. 44140625kHz.

[0108] Zn(i)为第η个OFDM符号中第i个子载波上承载的数据,映射关系如下 [0108] Zn (i) for the first OFDM symbol η i-th data carried on subcarriers, the following mapping relationship

[0109] Bf = 8MHz : [0109] Bf = 8MHz:

[0110] [0110]

Figure CN101018105BD00104

[0111] Bf = 2MHz : [0111] Bf = 2MHz:

[0112] [0112]

Figure CN101018105BD00105

[0113] Bf = 8MHz和Bf = 2MHz时的OFDM子载波结构分别如图6和图7所示。 [0113] Bf = 8MHz and Bf = OFDM sub-carrier structure at 2MHz, respectively 6 and 7 shown in FIG.

[0114] 1.4 成帧 [0114] 1.4 Framing

[0115] 所述成帧模块40用于将所述OFDM符号加入信标以形成传输帧。 The [0115] 40 for framing module is added to the beacon OFDM symbol to form a transmission frame.

[0116] 1. 4. 1所述传输帧的时域帧结构 [0116] The time-domain frame structure of a transmission frame 1. 4.1

[0117] 物理层信号每1秒为1帧,划分为40个时隙。 [0117] physical layer signals per second to one frame is divided into 40 time slots. 每个时隙的长度为25ms,包括1个信标和53个OFDM符号。 The length of each slot is 25ms, which corresponds comprising a beacon and 53 OFDM symbols. 时隙划分和帧结构如图8所示。 The frame structure and slot allocation as shown in FIG.

[0118] 划分时隙传输的原因是针对不同性质的数据流(视频、音频、控制信息和紧急广播信息等)采用不同的时隙传输,以方便媒体访问层(MAC)的灵活配置。 [0118] Cause slotted transmitted data stream (video, audio, and control information, emergency broadcast information, etc.) for different types of transmission using different time slots to facilitate medium access layer (MAC) of flexible configuration.

[0119] 1.4. 2 信标 [0119] 1.4. Beacon

[0120] 信标结构如图8所示,包括2个相同的同步信号以及发射机标识信号(TxID)。 [0120] beacon structure shown in Figure 8, includes two identical synchronization signal and a transmitter identification signal (TxID).

[0121] a)同步信号 [0121] a) a synchronization signal

[0122] 所述同步信号为频带受限的伪随机信号,长度记为Tb,取值为204. 8 μ s。 The pseudo random signal [0122] synchronizing signal is band-limited, referred to as a length Tb, value of 204. 8 μ s. 同步信号由下式产生: Synchronizing signal generated by the following formula:

[0123] [0123]

Figure CN101018105BD00111

[0124] 其中:Nb为同步信号的子载波数,取值如下: [0124] wherein: the number of Nb subcarrier synchronizing signal values ​​are as follows:

[0125] [0125]

Figure CN101018105BD00112

[0126] ( Δ f)b为同步信号的子载波间隔,取值为4. 8828125kHz。 [0126] (Δ f) b subcarriers at intervals of the synchronization signal, a value of 4. 8828125kHz.

[0127] Xb (i)为BPSK调制的伪随机信号,伪随机序列由十一位移位寄存器产生。 [0127] pseudo random signal Xb (i) is BPSK modulated by a pseudo-random sequence generated eleven shift register.

[0128] 同步信号的插入加快了接收机的同步速度和精度并且可用于信道估计。 Insert [0128] synchronous signal sync accelerated speed and accuracy of the receiver and may be used for channel estimation.

[0129] b)发射机标识信号 [0129] b) a transmitter identification signal

[0130] 发射机标识信号^(0为频带受限的伪随机信号,用于标识不同发射机。SID(t)长度记为Tid,取值为36. 0μ S。发射机标识信号由下式产生: [0130] The transmitter identification signal ^ (0 is the band-limited pseudo random signal, used to identify different transmitters .SID (t) referred to as Tid of the length, the value is 36. 0μ S. transmitter identification signal is represented by the following formula produce:

Figure CN101018105BD00113

[0132] 其中:Nid为发射机标识信号的子载波数,取值如下: [0132] wherein: Nid subcarrier transmitter identification number signal values ​​are as follows:

[0133] [0133]

Figure CN101018105BD00114

[0134] (Af)ro为发射机标识信号的子载波间隔,取值为39. 0625kHz。 [0134] (Af) ro subcarriers at intervals of the transmitter identification signal, a value of 39. 0625kHz.

[0135] Xid⑴为BPSK调制的伪随机信号。 [0135] Xid⑴ pseudo random signal is BPSK modulation.

[0136] 发射机标识序列TxID (k)长度为191比特(Bf = 8MHz)或37比特(Bf = 2MHz)。 [0136] The transmitter identification sequence TxID (k) of length 191 bits (Bf = 8MHz) or 37 bits (Bf = 2MHz).

[0137] 发射机标识的循环前缀(IDCP)长度Tidcp = 10. 4uS [0137] The cyclic prefix transmitter identification (IDCP) length Tidcp = 10. 4uS

[0138] 1.4. 30FDM 符号 [0138] 1.4. 30FDM symbol

[0139] OFDM符号由循环前缀(CP),OFDM符号体和可选择的保护间隔(GI)构成。 [0139] OFDM symbol, OFDM symbol body and the optional guard interval (GI) is composed of a cyclic prefix (CP). 如图10 所示。 As shown in FIG. 保护间隔信号由相邻OFDM间的前后保护(GD)经加窗交叠形成,如图9所示。 The guard interval signal is formed by the overlap between the front and rear protective OFDM (GD) adjacent windowed, as shown in FIG.

[0140] T0为符号体长度,T1为循环前缀长度,Tgd为前后保护长度。 [0140] T0 is the length symbol, T1 is the cyclic prefix length, Tgd is the longitudinal length of the guard. Ttl,T1和TeD的取值列于表五: Ttl, T1 and TeD values ​​listed in Table 5:

[0141] 表五 [0141] Table V

[0142] [0142]

Figure CN101018105BD00115

[0143] 1. 5上变频 [0143] 1.5 upconversion

[0144] 所述上变频模块50用于对所述传输帧进行上变频以产生用于发射的射频信号。 [0144] The conversion module 50 for performing frequency conversion on the RF signal to generate a transmission frame for transmission.

[0145] 成帧的基带信号经过正交上变频后产生射频信号,射频信号通过下式描述: [0145] framed baseband signal is a radio frequency signal is generated, a radio frequency signal after quadrature frequency conversion is described by the following formula:

[0146] [0146]

Figure CN101018105BD00116

[0147] 其中,S(t)为射频信号 [0147] where, S (t) is a radio frequency signal

[0148] f。 [0148] f. 为载波频率 It is the carrier frequency

[0149] Frame (t)为成帧后的基带信号 [0149] Frame (t) is the baseband signal after framing

[0150] F(t)为发射滤波器冲激响应。 [0150] F (t) is the impulse response of the transmit filter. [0151] 以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换等,均应包含在本发明的保护范围之内。 [0151] The foregoing is only preferred embodiments of the present invention but are not intended to limit the present invention, any modifications within the spirit and principle of the present invention, made by the equivalents should be included in the present invention, within the scope of protection.

Claims (13)

1. 一种移动数字多媒体广播信号传输系统,其特征在于,其包括两组信道编码器,分别接收第一、第二组数据流并将数据流经编码和交织处理后转换为比特流;星座映射器,用于将所述两组信道编码器输出的两组比特流结合后映射为QAM模式的符号流,将其中能量最大的两比特分配给第一组数据流,将其他低能量比特分配给第二组数据流,并增加能量最大的两比特的能量;OFDM符号形成模块,用于根据所述星座映射器形成的符号流形成OFDM符号;成帧模块,用于将所述OFDM符号加入信标以形成传输帧;上变频模块,用于对所述传输帧进行上变频以产生用于发射的射频信号。 A mobile digital multimedia broadcasting signal transmission system, characterized in that it comprises two groups of channel encoder, receives the first, respectively, converted into a bit stream and a second set of data flows and data flows interleaving encoding process; constellation a mapper for mapping the bit stream in connection with two sets of channel encoder output symbol stream to QAM mode, in which the two maximum energy allocated to the first group of data bit stream, the bit allocation other low energy to the second set of data flows, and to increase the energy of the maximum energy of the two bits; OFDM symbol forming means for forming OFDM symbols of the symbol stream according to constellation mapper formed; framing module, for the OFDM symbols added beacon to form a transmission frame; up-conversion module for upconverting the transmission frame to generate a radio frequency signal for transmission.
2.根据权利要求1所述的移动数字多媒体广播信号传输系统,其特征在于,所述QAM模式是16QAM或64QAM模式。 2. Move the digital multimedia broadcasting signal transmission system according to claim 1, wherein said QAM mode is 16QAM or 64QAM mode.
3.根据权利要求2所述的移动数字多媒体广播信号传输系统,其特征在于,在QAM模式为16QAM模式时,比特顺序为b0bll32b3,将bObl分配给第一组数据流,将l32b3分配给第二组数据流。 3. The mobile digital multimedia broadcast signal transmission system according to claim 2, wherein, when the mode is the 16QAM QAM mode, the bit order of b0bll32b3, the bObl assigned to a first group of data stream, is assigned to the second l32b3 set of data flows.
4.根据权利要求2所述的移动数字多媒体广播信号传输系统,其特征在于,在QAM模式为64QAM模式时,比特顺序为b0bll^b;3b4b5,将bObl分配给第一组数据流,将I32b3b4l35分配给第二组数据流。 4. The mobile digital multimedia broadcasting signal transmission system according to claim 2, wherein, in the mode of 64QAM QAM mode, the bit order of b0bll ^ b; 3b4b5, the bObl assigned to a first group of data stream, I32b3b4l35 assigned to the second set of data flows.
5.根据权利要求1所述的移动数字多媒体广播信号传输系统,其特征在于,所述每一个信道编码器包括有外编码器、外交织器、内编码器及内交织器,第一、二组数据流依次经过外编码器、外交织器、内编码器及内交织器处理后输出。 The mobile digital multimedia broadcasting signal transmission system according to claim 1, wherein each of said channel encoder comprises an outer encoder, an outer interleaver, inner encoder and an inner interleaver, the first and second set of data flows sequentially through the outer encoder, an outer interleaver, and the rear inner interleaver encoder output processing.
6.根据权利要求5所述的移动数字多媒体广播信号传输系统,其特征在于,所述每一个信道编码器具有不同的编码速率和交织方式。 6. The mobile digital multimedia broadcasting signal transmission system according to claim 5, wherein each of the channel encoder having a coding rate and interleaving different ways.
7.根据权利要求5所述的移动数字多媒体广播信号传输系统,其特征在于,所述的两路信道编码器不同,并且每路信道编码器包括外编码器、外交织器、内编码器及内交织器中的部分单元。 7. The mobile digital multimedia broadcasting signal transmission system as claimed in claim 5, wherein said two different channel encoder, and each port of the channel encoder comprises an outer encoder, an outer interleaver, and the encoder interleaving an inner portion of the unit.
8.根据权利要求5所述的移动数字多媒体广播信号传输系统,其特征在于,所述外编码器采用二进制BCH码或RS码。 Mobile digital multimedia broadcast signal transmission system according to claim 5, wherein said outer encoder binary BCH code or the RS code.
9.根据权利要求8所述的移动数字多媒体广播信号传输系统,其特征在于,所述外交织器只针对RS码的校验符号进行交织,不对RS码的信息符号进行交织。 9. The mobile digital multimedia broadcasting signal transmission system according to claim 8, characterized in that only the outer interleaver interleaves RS code for the check symbols, the information symbol RS code interleaving right.
10.根据权利要求5所述的移动数字多媒体广播信号传输系统,其特征在于,所述信道编码器中的内编码器采用LDPC码或QC-LDPC码。 Mobile digital multimedia broadcast signal transmission system according to claim 5, wherein the channel encoder uses LDPC code encoding or QC-LDPC code.
11.根据权利要求1所述的移动数字多媒体广播信号传输系统,其特征在于,所述OFDM 符号形成模块的子载波和数据以及导频的对应关系为:(1)当信道带宽位为8MHz时,有效子载波编号为0〜3075或当信道带宽位为2MHz时,有效子载波编号为0〜627 ; (2)插入离散导频,在偶数OFDM符号中,从0开始,编号满足8¾形式的有效子载波为离散导频, 其中K为整数;在奇数OFDM符号中,编号满足8*K+4形式的有效子载波为离散导频,其中K为整数;C3)加入连续导频;(4)进行调制,有效子载波0〜3075分别对应IFFT变换中的-1537〜1538,或0〜627分别对应IFFT变换中的-313〜314。 11. The mobile digital multimedia broadcasting signal transmission system according to claim 1, wherein the module data subcarriers and pilot and the correspondence between the OFDM symbols is formed as: (1) when the bit 8MHz channel bandwidth is , the effective subcarrier number is 0~3075 when channel bandwidth or bit is 2MHz, the effective subcarrier number of 0~627; (2) inserting scattered pilots in even-numbered OFDM symbols beginning from zero, in the form of numbers satisfying 8¾ effective subcarriers scattered pilots, wherein K is an integer; in the odd OFDM symbols, numbers satisfy 8 * K + 4 in the form of active subcarriers of scattered pilots, wherein K is an integer; a C3) was added continuous pilot; (4 ) is modulated, corresponding to the effective subcarriers 0~3075 -1537~1538 IFFT transformation, respectively, or the corresponding 0~627 -313~314 IFFT transform, respectively.
12.根据权利要求11所述的移动多媒体广播信号传输系统,其特征在于,所述离散导频增加2-4dB发射功率。 12. The mobile multimedia broadcast signal transmission system according to claim 11, wherein the scattered pilots 2-4dB transmission power increase.
13.根据权利要求1所述的移动多媒体广播信号传输方法,其特征在于,所述信标包括两个相同的同步信号及发射机标识信号。 13. The mobile multimedia broadcasting signal transmission method according to claim 1, wherein the beacon comprises two identical synchronization signal and a transmitter identification signal.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8670463B2 (en) 2007-06-26 2014-03-11 Lg Electronics Inc. Digital broadcast system for transmitting/receiving digital broadcast data, and data processing method for use in the same
US8964856B2 (en) 2007-08-24 2015-02-24 Lg Electronics Inc. Digital broadcasting system and method of processing data in digital broadcasting system

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101405966B1 (en) 2007-06-26 2014-06-20 엘지전자 주식회사 Digital broadcasting system and method of processing data in digital broadcasting system
CA2697453C (en) 2007-08-24 2013-10-08 Lg Electronics Inc. Digital broadcasting system and method of processing data in digital broadcasting system
CN101785302B (en) * 2007-08-24 2013-07-17 Lg电子株式会社 Digital broadcasting system and method of processing data in digital broadcasting system
CN103944683B (en) * 2007-08-30 2018-10-19 Lg电子株式会社 The device sent and received signal and the method sent and received signal
CN101494629A (en) * 2008-01-24 2009-07-29 华为技术有限公司 Method and apparatus for obtaining symbol mapping diversity, generating star map and modulation
CN102100046B (en) 2008-10-21 2013-11-13 Lg电子株式会社 Apparatus for transmitting and receiving a signal and method of transmitting and receiving a signal
CN101741797B (en) * 2008-11-25 2013-04-24 华为技术有限公司 Method and device for transmitting multi-antenna broadcast
CN101742077B (en) 2008-11-26 2011-12-07 中兴通讯股份有限公司 A method and apparatus cmmb achieve synchronization channel slot
WO2010071272A1 (en) * 2008-12-15 2010-06-24 Lg Electronics Inc. Apparatus for transmitting and receiving a signal and method of transmitting and receiving a signal
CN104067586B (en) 2012-01-30 2018-02-09 马维尔国际贸易有限公司 System and method for generating the leading code sign in communication system
CN103581091B (en) 2012-07-31 2016-06-08 武汉邮电科学研究院 Transmitting and receiving systems, and a transmission method and reception method
CN103532897B (en) * 2013-04-07 2017-06-13 上海数字电视国家工程研究中心有限公司 OFDM modulation-demo-demodulation methods and corresponding emitter, receiver
KR101884257B1 (en) * 2014-02-20 2018-08-02 상하이 내셔널 엔지니어링 리서치 센터 오브 디지털 텔레비전 컴퍼니, 리미티드 Interleaving and mapping method and deinterleaving and demapping method for ldpc codeword
WO2015149280A1 (en) * 2014-04-01 2015-10-08 华为技术有限公司 Adaptive coding and modulation method, apparatus and system
US20150319021A1 (en) * 2014-05-02 2015-11-05 Qualcomm Incorporated Techniques for improving control channel capacity
CN103957432B (en) * 2014-05-13 2017-03-15 深圳清华大学研究院 A kind of hierarchical modulation transmission of compatible with DVB C standard and method of reseptance
CN105450355A (en) * 2014-09-02 2016-03-30 上海数字电视国家工程研究中心有限公司 Coding and modulating method, demodulating and decoding method, and information processing method
CN106877981A (en) * 2017-03-15 2017-06-20 北京北广科技股份有限公司 A kind of supper-fast shortwave is burst coding modulation technique
CN110071894A (en) * 2018-01-22 2019-07-30 中兴通讯股份有限公司 A kind of information processing method and system, sending device and reception device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1448015A (en) 2000-07-12 2003-10-08 高通股份有限公司 Multiplexing real time services and non-real time services for OFDM systems
CN1516460A (en) 2003-01-09 2004-07-28 北京泰美世纪科技有限公司 Method for making synchronization by utilizing time domain spread spectrum beacon in digital video broadcast

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1448015A (en) 2000-07-12 2003-10-08 高通股份有限公司 Multiplexing real time services and non-real time services for OFDM systems
CN1516460A (en) 2003-01-09 2004-07-28 北京泰美世纪科技有限公司 Method for making synchronization by utilizing time domain spread spectrum beacon in digital video broadcast

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP特开2006-166382A 2006.06.22

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8670463B2 (en) 2007-06-26 2014-03-11 Lg Electronics Inc. Digital broadcast system for transmitting/receiving digital broadcast data, and data processing method for use in the same
US9490936B2 (en) 2007-06-26 2016-11-08 Lg Electronics Inc. Digital broadcast system for transmitting/receiving digital broadcast data, and data processing method for use in the same
US8964856B2 (en) 2007-08-24 2015-02-24 Lg Electronics Inc. Digital broadcasting system and method of processing data in digital broadcasting system
US9369154B2 (en) 2007-08-24 2016-06-14 Lg Electronics Inc. Digital broadcasting system and method of processing data in digital broadcasting system

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