CN100525272C - Ground mobile multimedia broadcast receiving and transmitting method and systme based on free DAB - Google Patents

Ground mobile multimedia broadcast receiving and transmitting method and systme based on free DAB Download PDF

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CN100525272C
CN100525272C CN 200610161925 CN200610161925A CN100525272C CN 100525272 C CN100525272 C CN 100525272C CN 200610161925 CN200610161925 CN 200610161925 CN 200610161925 A CN200610161925 A CN 200610161925A CN 100525272 C CN100525272 C CN 100525272C
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channel
decoding
modulation
data
service
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CN101022435A (en
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健 张
李旭明
凯 王
鲍东山
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北京新岸线移动多媒体技术有限公司
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Abstract

本发明公开了基于免费DAB(数字音频广播)的T-MMB(地面移动多媒体广播)收发方法和系统,该方法包括:发端根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、信道编码,并将编码后的业务数据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中;将业务数据对应的子信道信息等在快速信息信道FIC中进行标识并进行信道编码,对MSC和FIC的编码码元进行信道调制,形成T-MMB传输帧,然后经过射频调制发送出去。 The present invention discloses a free T-MMB-based DAB (Digital Audio Broadcasting) (terrestrial mobile multimedia broadcast) transceiving method and a system, the method comprising: according to a preset configuration parameters originating multimedia service, service data sequentially source coding, channel coding, service data and encoded in a time division multiplex manner embedded in the main business T-MMB system channels the MSC; sub-channel information service data corresponding to the like are identified in the fast information channel FIC and subjected to channel coding, to the MSC and FIC symbols coded channel modulation, T-MMB transmission frame is formed, and then transmitted through the RF modulator. 收端,对接收到的信号进行射频解调和同步,得到T-MMB传输帧;对传输帧中FIC进行信道解调和信道解码,提取业务的相应配置参数,根据该参数对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码。 The receiving end, the received RF signal and synchronous demodulation, to give T-MMB transmission frame; frame transmission channel FIC demodulation and channel decoding, extracts the corresponding service configuration parameters, based on the parameter related to the MSC sequentially traffic data channel demodulation, channel decoding and source decoding. 应用本发明,在移动环境中多媒体广播业务数据能够有效的传输和接收。 Application of the present invention, multimedia broadcast service data in a mobile environment can effectively transmit and receive.

Description

基于免费DAB的地面移动多媒体广播收发方法与系统 Ground-based mobile multimedia broadcast transmission and reception method and system of free DAB

技术领域 FIELD

本发明涉及数字信息传输技术领域,尤指一种基于免费DAB的地面移动多媒体广播收发系统和方法。 Technical Field The present invention relates to digital information transmission, especially a mobile multimedia broadcast receiving system and method for ground based DAB-free.

背景技术 Background technique

DAB(Digital Audio Broadcasting)数字广播是由12个成员组成的协会一—著名的EUREKA- 147开发起来的,系统最初的名称是数字音频广播(DAB),而且一直被用作区分真正的DAB广播与其它数字音频广播的标准。 DAB (Digital Audio Broadcasting) digital radio is an association made up of 12 members of a - the famous EUREKA- 147 being developed, the initial name of the system is a digital audio broadcasting (DAB), and has been used to distinguish between real and DAB radio other digital audio broadcasting standard. 1994年,Eureka- 147被国际标准化组织(ISO)选定为数字音频广播国际标准。 In 1994, Eureka- 147 by the International Organization for Standardization (ISO) is selected as digital audio broadcasting international standards. DAB与传统的AM/FM广播体系相比,具有节省频谱资源、发射功率低、信息量大、抗噪声、抗干扰、抗电波传播衰落、适合高速移动接收等优点,它提供CD级的立体声音质,信号几乎零失真,是继传统的调幅、调频广播之后的第三代广播。 Compared with the conventional AM / FM broadcasting system DAB, having a spectrum resources saving, low transmit power, large amount of information, noise, interference, anti-fading radio wave propagation, etc. for high-speed mobile reception, it provides CD-quality stereo sound the signal distortion is almost zero, following the tradition of AM, FM radio broadcasting of the third generation.

通信系统的核心是如何在有限的带宽内提高传输效率和可靠性,为了提高可靠性,通常会在系统中使用高效的纠错码,而为了提高频谱利用率,可以采用高阶调制,传输更多节目。 The core is how to improve the communication system within a limited transmission bandwidth efficiency and reliability, in order to improve reliability, efficiency is typically used in the error-correcting code system, in order to improve the spectral efficiency, higher order modulation may be employed, more transmission multi-program. 由于DAB使用了巻积编码和DQPSK调制方式,使得系统的频谱利用率不高,并且巻积码不能满足视频的准无错接收。 Due to the use of DAB convolving DQPSK modulation and coding mode, so that the system spectrum utilization is not high, and can not meet the registration code convolving the error-free reception of video.

地面移动多媒体广播T-MMB则是在DAB标准的基础上,用高效的分组编码LDPC替换巻积编码,引入高阶调制,同时在DAB的快速信息信道FIC 中增加业务的描述信息而实现的一种新的高效数字多i某体广播解决方案。 Terrestrial mobile multimedia broadcasting T-MMB is based on DAB standards, with efficient packet encoding LDPC Alternatively convolving encoding, the introduction of high-order modulation, while increasing the description information service in a fast information channel the FIC DAB in achieved a kind of new efficient digital multi-i a body broadcast solutions. That

方案具有以下特点: Program has the following characteristics:

1) 频点可用性好 1) good frequency availability

2) 频谱利用率高;3) 节电性能好; 2) high spectrum efficiency; good 3) energy-saving performance;

4) 纠错能力强; 4) strong error correction capability;

5) 实现复杂度低。 5) low implementation complexity.

发明内容 SUMMARY

有鉴于此,本发明提供一种基于免费DAB的地面移动多媒体广播收发方法。 Accordingly, the present invention provides a mobile multimedia broadcast transceiving ground based DAB free.

应用本方法,能够在移动环境中有效传输和接收多媒体广播业务数据。 Application of the method, capable of effectively transmitting and receiving multimedia broadcast service data in a mobile environment. 本发明还提供一种基于免费DAB的地面移动多媒体广播收发系统。 The present invention also provides a free DAB-based terrestrial mobile multimedia broadcasting reception system. 为达到上述目的,本发明的技术方案具体是这样实现的: 发端,根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、 信道编码,将编码后的业务数据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中并根据业务数据的子栽波调制方式,确定MSC中对应的容量单元CU的大小;基于DAB快速信息信道FIC中的快速信息组FIG,将业务数据对应的子信道信息等在T-MMB的FIC中进行标识,对MSC和FIC数据采用新的信道编码和调制方式,对MSC和FIC的编码码元进行信道调制,形成T-MMB 传输帧,然后经过射频调制发送出去。 To achieve the above object, the technical solution of the present invention is achieved in particular: the originator, according to a preset configuration parameters of the multimedia service, service data sequentially source coding, channel coding, service data encoded in a time multiplexed manner embedding T-MMB system main service channel MSC and according to the sub-service data planted wave modulation mode, determining the size of the MSC corresponding to the capacity of the unit CU; fast packet FIG DAB fast information channel FIC is, traffic data sub-channel information corresponding to like in T-MMB of FIC identified, to the MSC and FIC data using the new channel coding and modulation scheme, coding symbol MSC and the FIC channel modulation, is formed T-MMB transmission frame, and then sent through the RF modulation.

收端,对接收到的信号进行射频解调和同步,得到T-MMB传输帧;对传输帧中FIC进行信道解调和信道解码,提取业务的子信道信息,根据该信息对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码。 The receiving end, the received RF signal and synchronous demodulation, to give T-MMB transmission frame; frame transmission channel FIC demodulation and channel decoding, extracting a subchannel information services, in accordance with the MSC in the related information sequentially traffic data channel demodulation, channel decoding and source decoding.

在一些实施例中,所述对业务数据进行的信源编码为:根据对应的多媒体业务配置参数,使用对应的信源编码器对业务数据进行信源編码。 In some embodiments, the source coding of the service data is: the corresponding multimedia service according to the configuration parameters, using the corresponding source coder for source coding service data.

在一些实施例中,所述对业务数据进行的信道编码包括信道纠错编码和时间交织,其中信道纠错编码为低密度奇偶校验码LDPC,编码码率为及,,时间交织为巻积交织,深度为D, Z)216。 In some embodiments, the channel encoding of the service data comprises error correction encoding and channel interleaving time, which channel error correction coding of the LDPC LDPC code, and the coding rate of the time interleaving is convolving ,, interleaving, a depth D, Z) 216. 在一些实施例中,所述对FIC进行的信道编码只包括信道纠错编码,其中信道纠错编码为低密度奇偶校验码LDPC,编码码率为及2 。 In some embodiments, the channel encoding of the FIC includes only channel for error correction coding, error correction coding channel which is a low density parity check code is the LDPC, coding rate and is 2.

在一些实施例中,所述确定MSC中对应的CU的大小为:nx32bits,其中n-2代表业务数据采用DQPSK调制方式,n-3代表业务数据采用8DPSK调制方式,n=4代表业务数据采用16DAPSK调制方式,n=6代表业务数据采用64DAPSK调制方式。 In some embodiments, the MSC determining the size of the CU corresponding to: nx32bits, wherein n-2 represent business data using DQPSK modulation, n-3 8DPSK represent business data using the modulation scheme, n = 4 represent business data were 16DAPSK modulation, n = 6 64DAPSK represent business data using the modulation scheme.

在一些实施例中,所述信道调制包括子载波调制和OFDM调制。 In some embodiments, the channel comprises modulating the subcarrier modulation and OFDM modulation.

在一些实施例中,所述的子载波调制为:对于MSC来说,可以釆用4点差分移相键控DQPSK、 8点差分移相键控8DPSK、 16点差分幅度和相位联合键控16DAPSK或64点差分幅度和相位联合键控64DAPSK;对于FIC来说,可以采用2点差分移相键控DBPSK、 4点差分移相键控DQPSK。 In some embodiments, the subcarrier modulation: for MSC, it may preclude the use of 4-point differential phase shift keying DQPSK, 8-point differential phase shift keying 8DPSK, 16 point difference on amplitude and phase shift keying 16DAPSK or 64-point difference on amplitude and phase shift keying 64DAPSK; for FIC, the two points may be used a differential phase shift keying DBPSK, 4-point differential phase shift keying DQPSK.

在一些实施例中,所述OFDM调制为:根据系统的工作频段和符号映射方式确定OFDM的传输模式,当MSC只使用DQPSK、 8DPSK子栽波调制时, 按照DAB的规范确定OFDM的传输模式;当MSC中使用了m-DPSK或m-DAPSK子载波调制时,所述m为16、 32或64中的一种或任意组合,若T-MMB 的工作频点为Band III,则采用传输模式IV进行OFDM调制,若T-MMB的工作频点为L-Band,则采用传输模式III进行OFDM调制 In some embodiments, the OFDM modulation is: determining a transmission mode according to the operating frequency and OFDM symbol mapping systematic manner, only when MSC DQPSK, 8DPSK sub planted wave modulation, OFDM transmission mode is determined in accordance with the DAB specification; when the MSC using m-DPSK or m-DAPSK subcarrier modulation, said m is one or any combination of 16, 32 or 64, if the T-MMB working frequency of Band III, the transmission mode is used IV performs OFDM modulation, if the T-MMB working frequency to L-Band, the use of OFDM modulated transmission mode III

在一些实施例中,所述形成T-MMB传输帧为:使用MSC信道内容、FIC 信道内容和同步信道内容形成T-MMB传输帧。 In some embodiments, the transmission frame is formed as a T-MMB: content channel using MSC, the FIC and sync channel channels formed T-MMB content transmission frame. 同步信道内容按照DAB的规范形成。 SUMMARY synchronization channel formed in accordance with the DAB specification.

在一些实施例中,所述将传输帧进行射频调制为:将传输帧信号搬移到Band III或L Band。 In some embodiments, the radio transmission frame modulation is: a moving signal to transmission frame Band III or L Band.

在一些实施例中,所述将业务数据对应的子信道信息等在T-MMB系统FIC 中进行标识为:所述子信道信息包括:子信道标识字段,用于标识业务数据占用的子信道;开始地址字段,用于标识子信道的第一个CU的地址;子栽波调制类型,用于标识使用的子栽波调制方式;保护级别,用于标识信道纠错编码码率;子信道大小,用于标识业务数据使用的CU个数;信源编码标识字段, 用于标识业务数据的信源编码类型。 In some embodiments, the sub-channel corresponding to the service data information in the FIC T-MMB system identified as: the sub-channel information comprises: a subchannel identification field, for identifying the data traffic subchannel occupies; start address field, a first address for identifying subchannels CU; plant promoter wave modulation type, used for identifying the sub-planted wave modulation mode; protection level, for identifying the channel error correction coding rate; the size of the subchannels , traffic data for identifying the number of CU use; source coding identifier field for identifying the type of source coding service data.

在一些实施例中,所述对传输帧中FIC进行信道解调和信道解码为:对传输帧中的FIC信息进行OFDM解调、子栽波解调和LDPC解码。 In some embodiments, the transmission frame FIC channel demodulation and channel decoding is: FIC information of the transmission frames to OFDM demodulation, and sub-demodulation wave planted LDPC decoding.

在一些实施例中,所述提取业务的相应配置参数为:根据信道解码后的FIC 信息,提取相应业务对应的子信道信息。 In some embodiments, the configuration parameters of the respective service is extracted: the FIC channel decoding information, extracting the corresponding sub-channel information corresponding to the service.

在一些实施例中,所述对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码为:根据提取的相应业务的子信道信息,提取MSC中对应的业务数据,并对该业务数据依次进行信道解调、信道解码和信源解码。 In some embodiments, the traffic to the MSC relevant data sequentially channel demodulation, channel decoding and source decoding is: The sub-channel corresponding to the extracted traffic information, extracts the service data corresponding to the MSC, and the sequentially traffic data channel demodulation, channel decoding and source decoding.

在一些实施例中,所述对业务数据依次进行信道解调、信道解码和信源解码为:信道解调包括OFDM解调和子载波解调;信道解码包括时间解交织和信道纠错解码;信源解码按照子信道信息中信源编码类型进行对应的信源解码。 In some embodiments, the sequentially service data channel demodulation, channel decoding and source decoding is: channel demodulator comprises an OFDM demodulator and a subcarrier demodulation; channel decoding comprises time deinterleaving and channel error correction decoding; Letter source decoding corresponding to the source decoding sub-channel information according to the type of source coding CITIC.

本发明的另一个目的是提供一种基于免费DAB的地面移动多媒体广播收发系统,该系统包括:网络控制中心(NCC)、发射台和接收机,其中, Another object of the present invention is to provide a free DAB terrestrial mobile multimedia broadcast system based transceiver, the system comprising: a network control center (an NCC), transmitting station and a receiver, wherein

所述NCC,用于将多媒体广播业务数据传送给所述发射台; 所述发射台,用于接收来自所述NCC的多媒体广播业务数据,根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、信道编码,将编码后的业务数据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中并根据业务数据的子载波调制方式,确定MSC中对应的容量单元CU的大小;基于DAB 快速信息信道FIC中的快速信息组FIG,将业务数据对应的子信道信息等在T-MMB的FIC中进行标识并进行信道编码,对MSC和FIC的编码码元进行信道调制,形成T-MMB传输帧,然后经过射频调制发送出去。 The NCC, for transmitting multimedia broadcast service data to the transmitting station; said transmitting station, for receiving a multimedia broadcast service data from the NCC, the multimedia service according to a preset configuration parameters, traffic data sequentially source coding, channel coding, service data encoded in a time division multiplex manner is embedded T-MMB system main service channel MSC and according to sub-carrier modulation of traffic data, determining the size of the MSC corresponding to the capacity of the unit CU ;, the sub-channel information service data corresponding to the like-based fast information groups FIG DAB fast information channel FIC in the T-MMB of the FIC identification and channel coding, the coded symbols MSC and the FIC channel modulation, is formed T-MMB transmission frame, and then transmitted through the RF modulator.

所述接收机,对接收到的信号进行射频解调和同步,得到HMMB传输帧;对传输帧中FIC进行信道解调和信道解码,提取业务的子信道信息,根据该信息对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码。 The receiver, the received RF signal and synchronous demodulation to obtain HMMB transmission frame; frame transmission channel FIC demodulation and channel decoding, extracting a subchannel information services, according to the information related to the MSC sequentially traffic data channel demodulation, channel decoding and source decoding.

在一些实施例中,所述发射台包括接收模块、信源编码模块、信道编码模块、信道调制模块和射频调制模块,其中, In some embodiments, the transmitting station comprises a receiving module, a module source coding, channel coding block, a modulation module and a RF channel modulation module, wherein

所述接收模块,用于接收来自所述NCC的多媒体广播业务数据和业务配置参数,生成FIC,并将业务数据转发给所述信源编码模块; The receiving module for receiving a multimedia broadcast service data and traffic from the NCC configuration parameters and generate the FIC, and forwards the service data to the source coding block;

所述信源编码模块,对所述接收模块转发来的业务信号进行相应的信源编码,然后将信源编码后的数据送给所述信道编码才莫块; The source coding module, the receiving module forwards the service signal corresponding to the source coding, the data is then sent to the source coding only the channel coding block MO;

所述信道编码模块,对接收的信源编码后的业务信号和FIC信号进行相应的信道编码; The channel coding module, for traffic signals and the FIC signal received source coding corresponding channel coding;

所述信道调制纟莫块,对信道编码后的数据进行子载波调制和OFDM调制, 形成传输帧; The Mo Si channel modulation block, the data after channel coding and subcarrier modulation OFDM modulation, the transmission frame is formed;

所述射频调制模块,用于将接收到的传输帧信号调制到预定的频点上,发送给所述接收机。 The RF modulation module, for transmitting the modulated signal frame received on a predetermined frequency, transmitted to the receiver.

在一些实施例中,所述T-MMB接收机包括射频解调模块、同步模块、业务配置参数提取模块、业务数据提取模块、信道解调模块、信道解码模块和信源解码模块,其中, In some embodiments, the T-MMB demodulation module comprises a radio frequency receiver, the synchronization module, service configuration parameter extraction module, service data extraction module, a channel demodulation block, a channel decoding and source decoding module block, wherein

射频解调模块,用于接收发射台发送的射频信号,并将信号经中频/数字下 RF demodulating means for receiving a radio frequency signal transmitting station is transmitted, the IF signal and / or digital

变频进行解调; Demodulating frequency;

同步模块,用于对接收到的射频解调之后的数据进行同步形成传输帧; 业务配置参数提^^莫块,用于对传输帧的FIC部分进行信道解调和信道解 Synchronization module, the data after the received RF demodulator for synchronizing the transmission frame is formed; ^^ Mo service configuration parameters mentioned block, for channel demodulation and channel FIC solution to the portion of the transmission frames

ii码,并提取业务配置参数,信道解调包括OFDM解调和子载波解调,信道解码为信道纠错解码; ii code, and extracting service configuration parameters, comprising a channel demodulator and OFDM demodulation subcarrier demodulation, channel decoding error correction decoding for the channel;

业务数据提取;t莫块,根据提取的业务配置参数提取MSC中相应的业务数据,并发送给信道解调模块; Extracting the service data; T Mo block extraction MSC corresponding service data, and sends the channel demodulation module according to the extracted service configuration parameters;

信道解调模块,对MSC中提取出的相关业务数据进行信道解调,包括OFDM解调和子载波解调,并发送给所述信道解码模块; Channel demodulation module, to the MSC extracted relevant service data channel demodulation, and a subcarrier demodulation of OFDM demodulation, and sends the channel decoding module;

信道解码模块,对信道解调后的数据进行信道解码,包括时间解交织和信道纠错解码,并发送给所述信源解码模块; Channel decoding module, the data channel demodulation after channel decoding, including time deinterleaving and channel decoding error correction, and sends the information source decoding module;

信源解码^t块,对信道解码后的数据进行信源解码。 ^ T source decoding block for decoding the data channel for source decoding.

本方案克服了现有的DAB系统的频带效率低和纠错能力差能缺点,更适合视频节目传输;相比其它制式的移动多媒体技术.,本发明有频点可用性好; 实现复杂度低;频带利用率高;纠错能力强;支持便携和移动接收等优点。 The present embodiment overcomes the conventional DAB system band efficiency and a low difference in the error correction capability can be disadvantages, is more suitable for transmission of video programs; compared to other standard mobile multimedia technologies, the availability of good frequency present invention;. Low complexity; high utilization frequency band; strong error correction capability; support portable and mobile reception and the like.

同时,本发明不仅可用于地面,卫星和其它传输媒介,也可用于数据广播,互连网,和其它宽带多媒体信息传输及综合数据业务领域。 Meanwhile, the present invention can be used not only terrestrial, satellite, and other transmission media can also be used for data broadcast, the Internet, multimedia and other broadband data services and integrated information transmission field.

附图说明 BRIEF DESCRIPTION

图1为本发明的基于免费DAB的T-MMB收发方法的收发总体流程图。 T-MMB transceiver-based free DAB transmission and reception method of a general flow chart of the present invention. FIG. 图2为本发明的基于免费DAB的T-MMB收发系统的总体结构图。 Based on the overall structure of the T-MMB free DAB reception system of FIG. 2 of the present invention. 图3为本发明的基于免费DAB的T-MMB收发方法的传输原理框图。 FIG 3 based on the transmission principle of the present invention, T-MMB free DAB transmission and reception method of a block diagram. 图4为本发明的基于免费DAB的T-MMB实施例中收发方法的传输具体流程图。 Examples transceiving transmission based DAB of free T-MMB embodiment of FIG. 4 is a detailed flowchart of the present invention.

图5为本发明的基于免费DAB的T-MMB收发方法实施例中釆用的8PSK符号星座图。 8PSK symbol constellation map in the embodiment of FIG. 5 preclude the use of the present invention based on the embodiment of free T-MMB transceiving method of DAB.

图6为本发明的基于免费DAB的T-MMB实施例中收发方法采用的16APSK符号星座图。 16APSK constellation symbol transceiving method adopted in the embodiment 6 of the present invention based on FIG DAB-free T-MMB embodiment.

图7为本发明的基于免费DAB的T-MMB实施例中收发方法采用的T-MMB传输帧结构图。 T-MMB transmission frame configuration diagram of a transceiver used in the method of the present invention based on FIG. 7 DAB-free T-MMB embodiment. 图8为本发明的基于免费DAB的T-MMB实施例中收发方法釆用的FIC 信息信道的业务组织区的结构图。 Method configuration diagram of a transceiver preclude FIC information channel for the service area of ​​the tissue of the present invention based on FIG. 8 DAB-free T-MMB embodiment. 图8中各个标识的含义如下: Sid :业务标识符。 The meaning of each identifier in FIG. 8 are as follows: Sid: service identifier.

Service Identifier description(业务标识符描述): Service Identifier description (Business Identifier description):

-Country Id :国家标识符。 -Country Id: country identifier.

-Service reference : 业务参考。 -Service reference: business reference.

-ECC :扩展的国家代码。 -ECC: Extended country code.

Local flag: 局部标记。 Local flag: the local tag.

CAId :条件接入标识符。 CAId: Conditional Access identifier.

Number of service components : 业务成分数 Number of service components: traffic into scores

Service component description(业务成分描述): Service component description (service component description):

-TMId :传输机制标识符 -TMId: transport mechanism identifier

國ASCTy :音频业务成分类型 State ASCTy: audio service component type

-SubChld :子信道标识符 -SubChld: subchannel identifier

-P/S :主要/次要标识 -P / S: primary / secondary identification

-CAflag : CA标记 -CAflag: CA mark

-DSCTy :数据业务成分类型 -DSCTy: data service component type

-FIDCId :快速信息数据信道标识符 -FIDCId: Fast Information Data Channel Identifier

以上各个标识的具体内容可以参见DAB标准(ETSI EN300 401 )。 Details can be found in each of the above identified DAB standard (ETSI EN300 401).

图9为本发明的基于免费DAB的T-MMB实施例中收发方法采用的FIC 信道的新业务子信道的结构图。 The new traffic channel FIC embodiment transceiving method using a DAB-based free T-MMB embodiment of the present invention of FIG. 9 subchannel structure of FIG.

图10为本发明的基于免费DAB的T-MMB实施例中收发方法采用的FIC信道的用户应用信息的结构图。 FIG user application configuration information channel FIC embodiment transceiving method using a DAB-based free T-MMB embodiment 10 of the present invention. FIG.

图11为本发明的基于免费DAB的T-MMB实.施例中接收方法的具体流程图。 DAB-based free T-MMB solid. Example reception method in detailed flowchart of FIG. 11 of the present invention.

13图12为本发明的基于免费DAB的T-MMB实施例中传输系统的具体结构图。 Specific configuration diagram of a DAB transmission system based on free T-MMB 13 of FIG. 12 embodiment of the present invention.

图13为本发明的基于免费DAB的T-MMB实施例中传输系统发射台的具体结构图。 FIG transmitting station specific configuration embodiment of the DAB transmission system based on free T-MMB embodiment 13 of the present invention. FIG.

图14为本发明的基于免费DAB的T-MMB实施例中T-MMB接收机的具体结构图。 Examples for the specific structure of the T-MMB receiver 14 of the present invention based on FIG DAB-free T-MMB embodiment.

具体实施方式 Detailed ways

为使本发明的目的、技术方案及优点更加清楚明白,以下参照附图并举较佳实施例,对本发明进一步详细说明。 For purposes of this invention, the technical solution and merits thereof more apparent, the preferred embodiments with reference to the accompanying drawings and the following embodiments, the present invention is further described in detail.

图1为本发明的基于免费DAB的T-MMB收发方法的收发总体流程图。 T-MMB transceiver-based free DAB transmission and reception method of a general flow chart of the present invention. FIG. 如图所示, as the picture shows,

根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、信道编码,并将编码后的业务数据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中; Multimedia services according to a preset configuration parameters, service data sequentially source coding, channel coding, the encoded service data embedded in a time multiplexed manner T-MMB main service channel MSC, system;

基于DAB快速信息信道FIC中的快速信息组FIG,将业务数据对应的子信道信息等在T-MMB的FIC中进行标识并进行信道编码; , Service data corresponding to the sub-channel information and the like are identified based on FIG DAB Fast Information Group fast information channel FIC T-MMB in the FIC and the channel coding;

对MSC和FIC的编码码元进行信道调制,形成T-MMB传输帧,然后经过射频调制发送出。 To the MSC and FIC symbols coded channel modulation, T-MMB transmission frame is formed, and then transmitted through the RF modulator.

图1为本发明的基于免费DAB的T-MMB收发方法的收发总体流程图。 T-MMB transceiver-based free DAB transmission and reception method of a general flow chart of the present invention. FIG. 如图1所示, As shown in Figure 1,

对接收到的信号进行射频解调和同步,得到T-MMB传输帧; 对传输帧中FIC进行信道解调和信道解码,提取业务的子信道信息; 根据业务的子信道信息对MSC中的相关业务数据依次进行信道解调、 Radio frequency received signal demodulation and synchronization, to give T-MMB transmission frame; frame transmission channel FIC demodulation and channel decoding, extracting a subchannel information services; sub-channel information according to the service related to the MSC traffic channel demodulation data sequentially,

信道解码和信源解码。 Channel decoding and source decoding.

图2为本发明的基于免费DAB的T-MMB收发系统的总体结构图。 Based on the overall structure of the T-MMB free DAB reception system of FIG. 2 of the present invention. Such as

图所示,该系统包括:网络控制中心(NCC)210,发射台220和接收机230。 As shown in FIG., The system comprising: a network control center (NCC) 210, transmitter 220 and receiver 230. 在该系统中,NCC210,用于将多媒体广播业务数据发送给发射台220; In this system, NCC210, for transmitting multimedia broadcast service data to the transmitting station 220;

发射台220用于接收来自所述NCC的多媒体广播业务数据,根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、信道编码,将编码后的业务数据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中并根据业务数据的子载波调制方式,确定MSC中对应的容量单元CU的大小; 基于DAB快速信息信道FIC中的快速信息组FIG,将业务数据对应的子信道信息等在T-MMB的FIC中进行标识并进行信道编码,对MSC和FIC的编码码元进行信道调制,形成T-MMB传输帧,然后经过射频调制发送出去; Transmitter 220 for receiving a multimedia broadcast service data from the NCC, the multimedia service according to a preset configuration parameters, service data sequentially source coding, channel coding, service data embedded in the encoded time division multiplexed manner main service T-MMB system channel MSC and according to sub-carrier modulation of traffic data, determining the size of the MSC corresponding to the capacity of the unit CU; fast packet FIG DAB fast information channel FIC is, the service data corresponding to the sub- channel information like the T-MMB identification of the FIC and the channel coding, the coded symbol of the MSC and the FIC channel modulating T-MMB transmission frame is formed, and then transmitted through the RF modulator;

接收机230对接收到的信号进行射频解调和同步,得到T-MMB传输帧; 对传输帧中FIC进行信道解调和信道解码,提取业务的子信道信息,根据该信息对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码。 Signal receiver 230 demodulates the received radio frequency and synchronization, to give T-MMB transmission frame; frame transmission channel FIC demodulation and channel decoding, extracting a subchannel information services, in accordance with the MSC in the related information sequentially traffic data channel demodulation, channel decoding and source decoding.

上述即为本发明的基于免费DAB的T-MMB收发方法和系统的总体概述。 Based on a general overview T-MMB transceiving method and a system free of the DAB is the present invention.

图3为本发明的基于免费DAB的T-MMB收发方法的传输原理框图。 FIG 3 based on the transmission principle of the present invention, T-MMB free DAB transmission and reception method of a block diagram. 如图3所示,T-MMB系统中各种业务数据经过可选的条件接收加扰、能量扩散、LDPC编码和时间交织后以时间复用的方式嵌入主业务复用器MSC。 As shown in FIG. 3, T-MMB system through a variety of service data receiving scrambled optional condition, energy dispersal, the LDPC coding and time interleaving in a time multiplexed manner embedded in the main service multiplexer MSC. 同时,FIC数据经过可选的条件接收加扰、能量扩散、LDPC编码后同MSC 的数据一起送给传输帧复用器,然后送给OFDM调制形成传输帧,经过射频调制后发送出去。 At the same time, the FIC data is subjected to scrambling optionally conditional, energy dispersal, the LDPC encoding to the same data transmission frame multiplexer with the MSC, and then to the OFDM modulation form a transmission frame, transmitted through the RF modulator.

图4为本发明的基于免费DAB的T-MMB实施例中收发方法的传输具体流程图。 Examples transceiving transmission based DAB of free T-MMB embodiment of FIG. 4 is a detailed flowchart of the present invention. 如图4所示,该方法包括: 4, the method comprising:

步骤401,预先设定多媒体广播的业务配置参数。 Step 401, a predetermined multimedia broadcasting service configuration parameters.

步骤402,根据业务配置参数,在快速信息信道FIC中进行相应标识。 Step 402, according to the service configuration parameters, the corresponding identification in the fast information channel FIC.

本实施例中,为能够达到多路业务数据复用传输的目的,将业务数据的业务类型、子信道信息和业务数据的编码调制方式在FIC中进行相应标识。 In this embodiment, in order to achieve multi-channel multiplexed service data transmission purposes, the service type of the service data, sub-channel information and coding and modulation scheme corresponding service data identified in the FIC. 具体为: Specifically:

a.业务类型描述 a. service type described

15FIC中传输的快速信息组(FIG)类型0/扩展模式2 (0/2)定义了DAB 中业务信息如图8所示。 Fast packet transmitted 15FIC (FIG) type 0 / Extended Mode 2 (0/2) is defined in the DAB service information as shown in FIG. 该定义可具体参考ETSI EN300401。 This definition specifically referred to ETSI EN300401. 在本实施例中, 对FIG0/2的部分内容做了扩展,具体如下: In the present embodiment, a part of FIG0 / 2 extended made as follows:

-ASCTy(音频业务成分类型):这6比特区域指示音频业务成分的类型。 -ASCTy (audio service component type): This 6-bit region indicates a type of an audio service component. 本实施例中增加了两种音频编码方式的标识, The present embodiment adds two kinds of identification of the audio coding mode,

000011 : MPEG國4 HE AAC V2 000011: MPEG 4 HE AAC V2 country

000画:MPEG-4 ER-BSAC Of 000: MPEG-4 ER-BSAC

-DSCTy (数据业务成分类型):这6比特指示数据业务成分的类型。 -DSCTy (service component data type): 6 bits indicate the data type of this service component. 这部分具体解释见TS 101 756, table 2的定义。 This section specifically explained in TS 101 756, table 2 is defined. 本实施例中增加了一种新业务类型标识, The present embodiment adds a new service type identifier,

011101: T-MMB Service 。 011101: T-MMB Service.

通过在DAB系统中预留的快速信息组(FIG)类型0/扩展模式15(0/15) (ETSIEN300 401)来指示各类业务的子信道信息和编码调制方案。 By using the reserved system in the DAB Fast Information Group (FIG) type 0 / Extended Mode 15 (0/15) (ETSIEN300 401) to indicate the various services and sub-channel information coded modulation schemes. 具体如图9所示。 9 shown in detail in FIG.

SubChld(子信道标识符):这个6比特区域编码为无符号的二进制数,用来指示某个子信道。 SubChld (subchannel identifier): This 6-bit region as an unsigned binary number, used to indicate a sub-channel.

Start Address (开始地址):这个10比特区域编码为无符号的二进制数(范围O到863),指出子信道中第一个容量单元(CU)的地址。 Start Address (Start Address): This 10-bit region as an unsigned binary number (the range of O to 863) indicating the address of a subchannel capacity unit (CU) is.

ModuType(调制类型):这个2 比特标记用来指示是DQPSK78DPSK/16DAPSK/64DAPSK调制,如下: ModuType (modulation type): This 2-bit flag is used to indicate DQPSK78DPSK / 16DAPSK / 64DAPSK modulation, as follows:

00 : DQPSK; 00: DQPSK;

01 : 8DPSK; 01: 8DPSK;

10 : 16DAPSK; 10: 16DAPSK;

11 : 64DAPSK。 11: 64DAPSK.

CodingType (编码类型):这1比特用来指示信道编码方式,如下: CodingType (coding type): This bit is used to indicate a channel coding scheme, as follows:

O:保留; O: Reserved;

1 : LDPC编码。 1: LDPC coding. Rfii:这1比特为将来的添加保留。 Rfii: This 1-bit reserved for future add. 在定义前设为0。 Before the definition set to zero.

Sub-channel field (子信道数据区域):这12比特指示了子信道的大小和信道编码码率。 Sub-channel field (sub-data area): These 12 bits indicate the size of the subchannels and a channel coding rate.

-PL(保护等级):这2比特指示了信道编码码率,如下: 00:保护级别lC,表示信道编码码率为1/2; 01 :保护级别2-C,表示信道编码码率为2/3; 其他的为将来的使用保留。 -PL (protection level): 2 bits indicating that the channel coding rate, as follows: 00: lC, protection level, indicates the channel coding rate is 1/2; 01: Protection Level 2-C, represents a channel coding rate is 2 / 3; the other is reserved for future use.

-Sub-channel Size (子信道大小):这个10比特区域编码为无符号的二进制数(范围1到864),给出了根据调制方式和保护级别得出的子信道占用的容量单元数,见表1和2。 -Sub-channel Size (sub size): This 10-bit region as an unsigned binary number (range 1-864), it gives the number of volume units occupied by the modulation method and the level of protection obtained subchannels see tables 1 and 2. 其中,表1为保护级别为lC、数据速率是24 nKbit/s (n是大于或等于l的整数)时不同调制方式的数据子信道大小;表2为保护级别为2-C、数据速率是32nKbit/s(n是大于或等于l的整数)时不同调制方式的数据子信道大小。 Different modulation subchannel data size wherein, Table 1 lC, protection level, the data rate is 24 nKbit / s (n is an integer equal to or greater than l); and Table 2 for the protection level 2-C, the data rate is 32nKbit / data modulation subchannel mode when different size s (n is an integer greater than or equal to l).

<table>table see original document page 17</column></row> <table> <Table> table see original document page 17 </ column> </ row> <table>

表1 <table>table see original document page 17</column></row> <table>表2 Table 1 <table> table see original document page 17 </ column> </ row> <table> Table 2

b.用户信息描述 b. User Information Description

FIGO/13 (ETSIEN300 401 )中定义了用户应用信息。 In FIGO / 13 (ETSIEN300 401) defines the user application information. 本实施例中在该才莫式上扩展了部分内容,具体如图10所示。 In the present embodiment, only the expansion of the formula Mo part, particularly as shown in FIG.

User Application Type (用户应用类型):此11比特给i出了需要解码的用户应用,这些应用是由业务标号(SId)和业务成分标号(SCId)所标识的,其定义参考TS 101 756 table 16。 User Application Type (User Application Type): This 11-bit i to be a user application to be decoded, these applications are by the service reference numeral (the SId) and service component label (SCId) identified, defined with reference TS 101 756 table 16 . 本实施例中对此选项进行了扩展,具体如下: In the present embodiment this option is extended, as follows:

0x00b: T-MMB service 。 0x00b: T-MMB service.

User Application data (用户应用数据):此mx 8比特教据用来传输用户应用信息数据,译码时由用户应用类型决定。 User Application data (user application data): According to the teachings of this mx 8 bits used to transmit user data application information, the decoding is determined by a user application type. 针对T-MMB系统的新业务, 需要使用一个字节来表述T-MMB系统的业务属性-VideoServiceObjectProfiled。 T-MMB for new business system, requires the use of a byte to express the service attribute -VideoServiceObjectProfiled T-MMB system.

T-MMB视频服务框架1、框架2可分别由VideoServiceObjectProfileld = 0x01 、 VideoServiceObjectProfileld = 0x02来标识。 T-MMB video service frame 1, frame 2, respectively by the VideoServiceObjectProfileld = 0x01, VideoServiceObjectProfileld = 0x02 identified.

步骤403,接收多媒体广播业务数据,根据其业务配置参数,对接收到的业务数据进行信源编码和能量扩散。 Step 403, receiving a multimedia broadcast service data according to their service configuration parameters, the received service data source coding and energy dispersal.

信源编码属于压缩层,包括声音和图象的压缩编码。 It belongs compressive layer source coding, including sound and image compression coding. 本步骤中,目前主要可以依照ISO/IEC的MPEG1, MPEG2, MPEG4|H.264, AVS等系列标准, 对业务数据进行信源压缩,随着技术的发展,还可以釆用其它新的压缩算法, 例如小波编码,分形编码等。 In this step, the key can, MPEG2, MPEG4 in accordance with the ISO / IEC MPEG1 | H.264, AVS series of standards for business data source compression, with the development of technology, with other new compression algorithm may also preclude , e.g. wavelet coding, fractal coding. 完成信源压缩后,形成相应的数据流或数据包。 After completion of the source compression, to form the corresponding data stream or packet. 然后进行能量扩散,其能量扩散采用DAB系统中的方式进行。 And energy dispersion, energy diffusion system using DAB manner.

对FIC中的数据进行能量扩散,其能量扩散采用DAB系统中的方式进行。 FIC data diffusion of energy, the energy diffusion system using DAB manner.

步骤404,根据业务的配置参数,对经过能量扩散后的数据进行信道编码。 Step 404, according to the configuration parameters of the service, the channel coding data through an energy diffusion.

本步骤中,T-MMB采用的纠错编码方案为LDPC码。 In this step, error correction encoding scheme adopted for the T-MMB LDPC code. LDPC码可提供前向纠错功能,纠错性能强大,适合恶劣信道的信息传 LDPC codes can be provided prior to error correction, a powerful error correction performance, poor channel for transmission of information

输,高信噪比下几次迭代译码便收敛。 Lose, high signal to noise ratio several times iterative decoding will converge. 恰当设计的LDPC码具有很低的误码 A properly designed LDPC code has a very low error

平台,此时不需级联外码。 Platform, this time without the outer code concatenated.

本发明实施例中LDPC码对相同业务提供等差错保护,不同业务独立编码。 Examples of the LDPC code and the like to provide the same service error protection, service independent encoding different embodiment of the present invention. 前向纠错编码采用具有准循环结构的LDPC码,准循环的LDPC码可用移位寄存器进行编码而且便于存储。 Before using the quasi-cyclic LDPC code having the structure of error correction coding, quasi-cyclic LDPC code shift register can be used to encode and easy storage.

准循环LDPC码的校验矩阵H可以表示为如下形式: Quasi-cyclic check matrix H of LDPC code can be expressed as follows:

<table>table see original document page 19</column></row> <table>其中^是一个行(列)重量为""的",维的循环矩阵,而且""口'。由矩阵 <Table> table see original document page 19 </ column> </ row> <table> where ^ is a row (column) by weight "" of "cyclic-dimensional matrix, and '' mouth 'by the matrix

H表征的码字称为(N,K)LDPC码,其中wc"为码长,P)"表示编码信息比特的长度。 Characterized called H codeword (N, K) LDPC code, where wc "is the code length, P)" denotes the length of the encoded information bits. 4-W.',42…,4,]"、"…,P的第一行称为H的笫i个行生成器, 则H共有P个行生成器。 4-W. ', 42 ..., 4,] "," ..., P it is referred to the first line Zi of the i-th row H generators, the total P H rows generator.

校验矩阵H对应的生成矩阵G可以表示为:gW",其中I是单位阵, 准循环矩阵P可以如下表示: Check matrix H corresponding to the generator matrix G can be expressed as: gW ", where I is a unit matrix, a quasi-cyclic matrix P may be expressed as follows:

/^^,/V"…i^./,y-iA…,P的第一列称为生成矩阵g的第j个列生成器, The first column is referred /^^,/V"...i^./,y-iA...,P generator matrix g of the j-th column of the generator,

则G共有c—P个列生成器。 Total c-P then G columns generator.

编码过程如下:首先在信源比特的之后填充b个O,得到长度为K的编码信息比特,然后进行LDPC编码。 Encoding process is as follows: First, fill a O b after the source bit to obtain the length K of the encoded information bits, and LDPC encoding. 不同码率的LDPC码,所填充0的数目是不同的。 LDPC codes of different code rates, the number 0 is filled are different.

表3给出了业务数据两种LDPC编码码率《的编码参数。 Table 3 shows two kinds of LDPC-coded service data rate, "the encoding parameters. <table>table see original document page 20</column></row> <table> <Table> table see original document page 20 </ column> </ row> <table>

步骤405,对信道编码后的业务数据进行时间交织。 Step 405, the service data channel-coded interleaved time.

本步骤中,时间交织只适用于信道纠错编码后的业务数据,时间交织采用巻积交织,交织深度D216。 In this step, time interleaving apply only to channel error correction encoding of the service data, time interleaving using interleaving convolving interleaving depth D216.

步骤406 ,对时间交织后的业务数据以时分复用的方式嵌入主业务信道MSC中。 Step 406, traffic data for time-interleaved time division multiplex manner is embedded in the main service channel MSC.

本实施例中,主业务信道由公共交织帧(CIF)组成。 In this embodiment, the main service channel by a common interleaver frames (CIF) composition. 一个CIF的最小地址单元是容量单元(CU)。 The minimum address unit of CIF is a capacity unit (CU). 每个CIF由864个CU组成。 Each CIF composed of 864 CU. CU的大小是32x n个比特。 CU size is 32x n bits. n的取值有四种,分别对应四种不同的的差分调制方式: n=2(DQPSK)、 n-3 (8DPSK) 、 n=4 ( 16DAPSK)和n=6 (64DAPSK)。 The value of n, there are four, respectively corresponding to four different differential modulation scheme: n = 2 (DQPSK), n-3 (8DPSK), n = 4 (16DAPSK) and n = 6 (64DAPSK). T-MMB信号对应的CU大小随调制方式而变,但CIF包含的CU个数不变。 T-MMB signal corresponding to the modulation scheme with the CU size change, but the number of the CIF contained in the same CU.

步骤407,对MSC和信道编码后的FIC进行信道调制。 Step 407, to the MSC and the FIC channel-coded channel modulation. 本步骤中信道调制包括子载波符号映射、频率交织、差分调制和OFDM调制。 This modulation comprises the step of channel mapping subcarrier symbol, frequency interleaving OFDM modulation, and differential modulation.

本步骤中子载波符号映射为:4点移相键控(QPSK) 、 8点移相键控(8PSK) 、 16点幅度和相位联合键控(16APSK)和64点幅度和相位联合键控(64APSK)。 This step is mapped to subcarriers in symbol: 4:00 phase shift keying (QPSK), 8 point Phase Shift Keying (8PSK), 16 points on amplitude and phase shift keying (16APSK), and 64 points on amplitude and phase shift keying ( 64APSK). 对于FIC而言,本实施例中只采用QPSK子载波符号映射方式,MSC可以是上述4种的任意组合。 For FIC, this embodiment uses only the subcarrier QPSK symbol mapping method, MSC may be any combination of the above 4. 首先介绍符号映射: First introduced the symbol mapping:

1 ) 4点移相键控(QPSK) 1) 4-point phase-shift keying (QPSK)

QPSK映射参照DAB标准ETSI EN 300 401 。 Referring to QPSK mapping DAB standard ETSI EN 300 401. 2) 8点移相键控(8PSK) 2) 8 phase shift keying (8PSK)

8PSK星座如图5所示。 8PSK constellation shown in FIG. 对每个OFDM符号,3K-bit的矢量(/?',")-'需要通过以下方式映射成K个8PSK符号: 《,m"〜,附=0,/,么...,/:—i For each OFDM symbol, 3K-bit vector (? / ', ") -' to be mapped in the following way into K 8PSK symbols:", m "~, attachment = 0, /, what ..., /: -i

其中K是子栽波数,^"'如表5所示。 Where K is the wave number of the sub-planted, ^ ' "as shown in Table 5.

<table>table see original document page 21</column></row> <table> <Table> table see original document page 21 </ column> </ row> <table>

表5 table 5

3 ) 16点幅度和相位联合键控(16APSK ) 3) 16 points on amplitude and phase shift keying (16APSK)

f" 、4" f ", 4"

16APSK星座如图6所示。 16APSK constellation as shown in FIG. 对每个OFDM符号,4K-bit的矢量^'.")"=。 , 4K-bit vector for each OFDM symbol ^ '. ")" =. 通过以下方式映射成K个16APSK符号: 《,„ = 4,/°', , /« = 0, /, 2,…,尺一I Mapping in the following way 16APSK into K symbols: "," = 4, / ° ',, / «= 0, /, 2, ..., a I foot

其中。 among them. ,"如表6所示,夂"'。 "As shown in Table 6, Wen '".

<table>table see original document page 21</column></row> <table><table>table see original document page 22</column></row> <table> <Table> table see original document page 21 </ column> </ row> <table> <table> table see original document page 22 </ column> </ row> <table>

表6 Table 6

对映射后的符号进行频率交织,具体交织方式参照DAB标准ETSI EN 300 401。 Mapping symbols of frequency interleaving, interleaved manner with reference to specific DAB standard ETSI EN 300 401.

对频率交织后的符号再进行差分调制,具体如下: Interleaving symbols of the further differential modulation frequency, as follows:

1 ) DQPSK 1) DQPSK

差分调制在相邻的两个OFDM符号的同一个子载波上进行(即时域差分),按如下式进行: Differential modulation (difference time-domain) on the same sub-carrier of two adjacent OFDM symbols, formula performed as follows:

za ^Z/-'."}"' / = 2,3,4,…,丄, za ^ Z / - '. "}"' / = 2,3,4, ..., Shang,

-《/2""/2 - "/ 2" "/ 2

其中V"表示第"l个OFDM符号的第^个子载波的差分调制信号,〜 表示频域交织后的第Z个OFDM符号的第A个子载波的映射信号。 Wherein V "represents" on subcarrier l ^ OFDM symbols differentially modulated signal, - A represents a subcarrier signal of the mapping of the interleaving of frequency-domain OFDM symbols Z.

2 ) 8DPSK 2) 8DPSK

差分调制在相邻的两个OFDM符号的同一个子载波上进行(即时域差分),按如下式进行: Differential modulation (difference time-domain) on the same sub-carrier of two adjacent OFDM symbols, formula performed as follows:

Zu-z,—,"^4, / = 2,3,4,.."丄, Zu-z, -, "^ 4, / = 2,3,4, .." Shang,

-a:/2""/2 -a: / 2 "" / 2

其中A-"表示第卜l个OFDM符号的第A个子载波的差分调制信号,〜 表示频域交织后的第Z个OFDM符号的第A个子载波的映射信号。 3) 16DAPSK Wherein A- "represents A subcarrier modulation signal of the differential Bu l th OFDM symbol, - A represents subcarriers mapped signal after interleaving of frequency-domain OFDM symbols Z. 3) 16DAPSK

DAPSK是幅度与相位联合的差分调制方案,其幅度与相位分别独立进行差分调制。 DAPSK is combined differential amplitude and phase modulation scheme, the amplitude and phase differential modulation are performed independently. 16DAPSK的幅度按2DASK进行调制,相位按8DPSK进行调制。 16DAPSK amplitude modulated by 2DASK, phase modulated by 8DPSK. 差分调制在相邻的两个OFDM符号的相同的子载波上进行,公式如下: z,* = .aw-'."+w.")mod2 vW-"+"^>, / = 2,3,4,…,丄,其中">1是比例因子,,A表示16DAPSK的内环幅度;,《"表示频域交织后的映射符号所对应的幅度比特;^-", A、表示频域交织后的相位信息。在进行OFDM调制时,在原有的DAB系统中,对子载波数目,保护间隔长度和工作频段等参数进行了组合,形成了四种模式供使用者选择。表7 给出了四种模式对应的参数。参数 传输模式I 传输模式II 传输模式III 传输模式IVs 76 76 153 76K 1536 384 192 768N 2048 512 256 1024Ts ~1246 〜312 ~156 〜623Tu 1000 250 125 500TG 〜246 ~62 ~31 ~123Tf 96 24 24 48表7S:每个传输帧中OFDM符号个数(不包含空符号) K: 一个OFDM符号中子载波个数N: FFT大小(点)Ts: —个OFDM符号总的持续时间0is)Tu: —个OFDM符号中有用信号的持续时间0is)Tcj:保护间隔0is)TF:每个传输 Differential modulation on the same subcarrier in two adjacent OFDM symbols, using the following formula:. - ". + W" z, * = .aw ') mod2 vW - "+" ^>, / = 2,3 , 4, ..., Shang, wherein "> a is a scaling factor 16DAPSK ,, a represents the amplitude of the inner ring;" "denotes the frequency domain mapping of the interleaved symbols corresponding to the amplitude bits; ^ -", a, represents the frequency domain phase interleaved information when performing OFDM modulation, the original DAB system, the number of sub-carriers, the guard interval length and other parameters of the working band combined to form a four modes for users to choose. given in table 7 the four modes corresponding to a parameter and transmission mode transmission mode I II III transmission mode transmission mode IVs 76 76 153 76K 1536 384 192 768N 2048 512 256 1024Ts ~ 1246 ~312 ~ 156 ~623Tu 1000 250 125 500TG ~246 ~ 62 ~ 31 ~ 123Tf 96 24 24 48 table 7S: each transmission frame number of OFDM symbols (without a null symbol) K: the number of carriers in one OFDM symbol neutron N: FFT size (points) Ts: - total OFDM symbols duration 0is) Tu: - duration of OFDM symbols in the useful signal 0is) Tcj: a guard interval 0is) TF: each transmission 持续时间(ms)23步骤408,构造传输帧。本实施例中,规定一个传输帧由同步信道(Sync ),快速信息信道(FIC ) 和主业务信道(MSC)构成。其基本构造与DAB系统相同,以传输模式I 为例,其形成过程如图7所示,图中视频业务是经过TS封装的。步骤409,将传输帧进行射频调制并发送出去。理论上DAB支持各种波段,表8给出了DAB各种模式允许使用的波段,表9给出了各种波段的频率范围。传输模式 T-MMB标准中允许使用的波段传输模式I Bandl、 Band II、 Band III传输模式II Band I、 Band II、 Band III、 Band IV、 Band V、 L-Band传输模式III <3GHz传输模式IV Band I、 Band II、 Band III、 Band IV、 Band V、 L-Band表8波段 频率范围(MHz)Bandl 47-86Band II 87.5-108Band III 174-230Band IV/V 470-790L-Band 1452-1492表9目前,DAB工作频点是Band III和L-Band,在世界大部分地区已经得到分配,尤其是在欧洲,DAB基础设施已占到 Duration (ms) 23 in step 408, the configuration of a transmission frame. In this embodiment, a predetermined one transmission frame consists of a synchronization channel (Sync), a Fast Information Channel (FIC) and a main service channel (MSC) constitutes its basic configuration with DAB system the same transmission mode I, for example, the formation process shown in figure 7, the video service is the result of FIG TS encapsulation of step 409, the radio transmission frame is modulated and transmitted. theoretically support various DAB band table 8 shows the various modes allowed DAB band, table 9 shows the frequency range of various bands. T-MMB standard transmission mode in the transmission mode permitted band I Bandl, band II, band III transmission mode II band I, band II, band III, band IV, band V, L-band transmission mode III <3GHz transmission mode IV band I, band II, band III, band IV, band V, L-band table 8-band frequency range (MHz ) Bandl 47-86Band II 87.5-108Band III 174-230Band IV / V 470-790L-Band 1452-1492 table 9. currently, DAB Band III is the working frequency and the L-Band, in most of the world have been assigned, in particular in Europe, DAB infrastructure has accounted for 80%,表IO给出了DAB各种模式和波段实际使用情况,常用的其实就有两种,分别对应着Band-III和L-Band。 80%, IO table shows various modes and DAB bands actual use, in fact, there are two commonly used, correspond to the Band-III and L-Band. 值得强调的是这种对应是在调制方式为DQPSK情况下是最优的, 而当T-MMB系统采用了高阶的调制方案时,如16DAPSK,目前的模式与工作频点的对应关系并非最优。 This correspondence is worth emphasizing that in DQPSK modulation method is the optimal case, when the T-MMB system using higher order modulation schemes, such as 16DAPSK correspondence relationship, and the current mode of working frequency point is not the most excellent. 因此,需要重新选择模式。 Therefore, the need to re-select mode. 波段 DAB系统中实际使用的波段 DAB系统中实际对应的传输模式 T-MMB系统中推荐的传输模式Band I 否 否 否Band II 否 否 否Band III 是 传输模式I 传输模式IVBand IV 否 否 否L-Band 是 传输模式II 传输模式III表10由于T-MMB系统采用了更高阶调制方式,时变干扰的影响不可忽略。 DAB system band DAB system transmission band mode actually used in an actual T-MMB system corresponding to the recommended transmission mode Band I Band II No No No No No No Band III transmission mode is a transmission mode I No No No IVBand IV L- Band transmission mode is a transmission mode III table II effects due to T-MMB system using higher order modulation, 10 time varying interference can not be ignored. 影响时变干扰因素有:移动速度,载波频点,OFDM符号的块长。 Effect when varying interference factors: the block speed, carrier frequency, the OFDM symbol length. 为了抵抗时变干扰,T-MMB系统对载波数目,保护间隔长度,工作波段和调制星座的数目等参数进行了重新组合。 For time varying interference resistance, T-MMB system the number of carriers, the guard interval length, and number of other operating band modulation constellation parameters are recombined. 通过减小OFDM符号的块长,抵抗时变干扰。 By reducing the block length of OFDM symbols, time varying interference resistance. 为了兼容DAB系统,T-MMB减小OFDM符号的块长通过调整DAB实际使用的波段所对应的模式。 For compatibility with the DAB system, T-MMB to reduce the block length by adjusting the OFDM symbol DAB band corresponding to the actual pattern. 通过修改,T-MMB系统支持高效低复杂度16DAPSK调制方式同时支持高速移动接收。 By modifying, T-MMB system supports efficient low complexity modulation scheme 16DAPSK supports high-speed mobile reception. 表IO给出了T-MMB系统釆用16DAPSK所建议的模式和对应的波段,相比DAB, OFDM符号的载波数减小了一半。 Table shows the T-MMB IO system 16DAPSK preclude the use of the proposed model and the corresponding bands, compared DAB, the number of carriers of OFDM symbols is reduced by half. 根据表10采用合适的OFDM调制和射频调制后,将业务数据发送出去。 According to Table 10 using the appropriate OFDM modulation and RF modulation, transmitted traffic data. 至此,本实施例中的基于免费DAB的T-MMB传输方法流程结束。 Thus, the transmission method T-MMB-based free flow of DAB in the present embodiment ends. 由上述流程可以看出,本发明的传输方法基于DAB系统的OFDM调制参数和帧结构,采用了新的信道编码和子载波调制方案,更适于传输视频数据。 As can be seen from the above processes, the transmission method of the present invention is based on OFDM modulation parameters and the frame structure of the DAB system, it uses a new channel coding and subcarrier modulation scheme, and more suitable for transmission of video data. 进一步地,对实际应用的频点与传输模式进行了相应地修改,以更好地适应高效低复杂度的调制方式。 Further, the frequency of the transmission mode practical application has been modified accordingly, in order to better adapt the modulation scheme of high efficiency and low complexity. 与该传输方法相对应,本实施例还提供了基于免费DAB的T-MMB的25接收方法。 Corresponding to the transmission method, the present embodiment further provides a method of receiving a free T-MMB-based DAB 25. 用于接收应用上述传输方法发送的数据,并进行相应处理还原为原始的多媒体业务数据。 Receiving application data transmission method for the transmission, and treated accordingly restore the original multimedia service data. 图11为本发明的基于免费DAB的T-MMB实施例中接收方法的具体流程图。 Specific flowchart illustrating a method for receiving DAB based free T-MMB embodiment 11 of the present invention. FIG. 如图ll所示,该方法包括:步骤IIOI,接收数据,并进行射频解调和同步,得到传输帧。 As shown in FIG ll, the method comprising the steps of: IIOI, receive data, and RF demodulator synchronization and obtain the transmission frame. 本步骤中,依据DAB系统的方法进行相应接收数据的射频解调和同步处理即可,这里不再赘述。 In this step, the received data for the respective RF demodulator and synchronization processing method according to the DAB system, is not repeated here. 步骤1102,对传输帧中FIC进行信道解调和信道解码,提取业务的子信道信息。 Step 1102, the transmission frame FIC channel demodulation and channel decoding, extracting a subchannel information services. 本步骤中,对传输帧中的FIC信息进行OFDM解调、子载波解调和LDPC 解码。 In this step, the information on the FIC in the transmission frame based on OFDM, a subcarrier demodulation and the LDPC decoder. 根据信道解码后的FIC信息,提取相应业务对应的子信道信息。 The FIC channel decoding information, extracting the corresponding sub-channel information corresponding to the service. 步骤1103,利用提取的业务子信道信息,提取MSC中相关业务数据并依次进行信道解调、信道解码和信源解码。 Step 1103, using the information extracted traffic subchannels, the MSC extracting relevant traffic data and sequentially channel demodulation, channel decoding and source decoding. 本步骤中,信道解调包括OFDM解调和子载波解调;信道解码包括时间解交织和信道纠错解码;信源解码按照子信道信息中信源编码类型进行对应的信源解码。 In this step, the channel comprising a demodulating OFDM demodulation and subcarrier demodulation; channel decoding comprises time deinterleaving and channel error correction decoding; source decoder for source decoding corresponding to the sub-channel information according to the type of source coding CITIC. 以上为本发明实施例中基于免费DAB的T-MMB收发方法的具体实施方式,能够实现高效传输多种业务数据的目的,并且适于移动接收、频点可用性好。 The above embodiments of the present invention based on specific embodiments T-MMB free DAB transmission and reception method, it is possible to achieve the purpose of more efficient transmission of service data, and adapted to mobile reception, good frequency availability. 本发明实施例还提供一种基于免费DAB的T-MMB的收发系统,可以用于实施上述传输和接收方法。 Embodiments of the invention also provides T-MMB transceiver system based on free DAB may be used to implement the above-described transmission and reception method. 图12即为本发明的基于免费DAB的T-MMB实施例中传输系统的具体结构图。 FIG 12 is the DAB-based free T-MMB specific configuration diagram of the transmission system of the present embodiment of the invention. 如图12所示,该系统包括: 一个网络控制中心(NCC) 1210, — 个以上的位于不同地区的发射台1220, 一个以上的接收机1230,这样即可以组成一个整体地面移动多媒体广播网。 As shown, the system 12 comprises: a Network Control Center (NCC) 1210, - one or more transmitting stations located in different areas 1220, one or more receivers 1230, so that can form a whole terrestrial mobile multimedia broadcast network. 网络控制中心NCC 1210,用于将多媒体广播业务数据传送给发射台1220;发射台1220,用于接收来自NCC 1210的多媒体广播业务数据,根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、信道编码,并将编码后的业务教:据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中;基于DAB快速信息信道FIC中的快速信息组FIG,将业务数据对应的子信道信息等在T-MMB的FIC中进行标识并进行信道编码,对MSC和FIC的编码码元进行信道调制,形成T-MMB传输帧,然后经过射频调制发送出去。 Network control center NCC 1210 for the multimedia broadcast service data transmitted to a transmitting station 1220; 1220 transmitter, for receiving a multimedia broadcast service data from NCC 1210 according to a preset configuration parameters of the multimedia service, service data channel sequentially after source coding, channel coding, the encoded service teach: According time multiplexed manner embedded in the main business T-MMB system channels the MSC; fast packet FIG DAB fast information channel FIC is, the service data corresponding to subchannel information in the T-MMB identification of the FIC and the channel coding, to the MSC and FIC symbols coded channel modulation, T-MMB transmission frame is formed, and then transmitted through the RF modulator. 发射出去的信号,利用地面波传输到地面移动接收机或便携接收机1230。 Out signal transmission by ground waves transmitted to the mobile receiver or a portable receiver surface 1230.

接收机1230,对接收到的信号进行射频解调和同步,得到T-MMB传输帧; 对传输帧中FIC进行信道解调和信道解码,提取业务的子信道信息,根据该信息对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码。 Receiver 1230, the received RF signal and synchronous demodulation, to give T-MMB transmission frame; frame transmission channel FIC demodulation and channel decoding, extracting information services sub-channel, based on the information in MSC sequentially related traffic data channel demodulation, channel decoding and source decoding.

由于发射台1220的覆盖区域依赖于许多因素,例如,地形,发射塔的高度和功率,接收机天线和增益/指向性等,使用户接收到的信号不仅有直达信号, 还有经过一次或多次反射的信号,以及多频网或单频网中远方发射机发射的信号,因此,就存在一个多径干扰的问题,另外,对于移动接收机,存在多谱勒效应,因此,传输信道建模为时变多径信道,由于本发明采用了DAB系统结构,其传输层的设计本身就是为这种时变多径信道量身定制的,因此本发明的T-MMB传输系统支持移动接收和SFN组网。 Since the transmission coverage area table 1220 depend on many factors, e.g., terrain, and the height of the power transmission towers, and receiver antenna gain / directivity, so that the user receives a signal not only the direct signal, as well as after one or more signal reflections, and a single-frequency or multi-frequency network signals transmitted by the transmitter in the remote network, thus, there is a problem of multipath interference, in addition, for a mobile receiver, the Doppler effect is present, and therefore, the transmission channel built molding a time varying multipath channel, since the present invention employs a structure of the DAB system, the design of its transport layer itself when this varying multipath channel customized, so T-MMB transmission system of the present invention supports mobile reception and SFN network.

具体地,发射台1220的结构如图13所示。 In particular, emission structure 1220 is shown in table 13 shown in FIG.

发射台包括接收模块1221、信源编码模块1222、信道编码模块1223、 信道调制模块1224和射频调制模块1225,其中, Transmitting station includes a receiving module 1221, module 1222 source coding, channel coding module 1223, a channel modulation module 1224 and a radio frequency modulation module 1225, wherein,

接收模块1221,用于接收来自所述NCC 1210的多媒体广播业务数据和业务配置参数,利用接收的业务配置参数生成FIC,并将接收的业务数据转发给信源编码模块1222; A receiving module 1221, configured to receive configuration parameters from the NCC multimedia broadcast services and service data 1210, using the received service configuration parameters to generate the FIC, and forward the received service data to the source coding module 1222;

信源编码模块1222,对接收模块i221转发来的业务信号进行相应的信源编码,然后将信源编码后的数据送给信道编码模块1223; Source coding module 1222, a receiving module i221 forwarded traffic signals corresponding source coding, and the coded data is sent to the source channel coding module 1223;

信道编码模块1223,对接收的信源编码后的业务信号和FIC信号进行相应的信道编码,然后将信道编码后的数据送给信道调制模块1224;; Channel coding module 1223, a traffic signal and the FIC signal source coding corresponding received channel encoding, and the data channel to the channel coding modulation module 1224 ;;

信道调制模块1224,对信道编码后的数据进行子载波调制和OFDM调制,形成传输帧; Channel modulation module 1224, the data after channel coding and subcarrier modulation OFDM modulation, the transmission frame is formed;

射频调制模块1225,用于将接收到的传输帧信号调制到预定的频点上, 发送给所述接收机1230。 RF modulator module 1225, a frame for transmitting the received modulated signal to a predetermined frequency, transmits to the receiver 1230.

具体地,T-MMB接收机的具体结构如图14所示。 Specifically, T-MMB specific configuration of the receiver shown in Figure 14.

T-MMB接收机包括射频解调模块1231、同步模块1232、业务配置参数提取模块1233、业务数据提取模块1234、信道解调模块1235信道解码模块1236和信源解码模块1237,其中 T-MMB receiver comprises a radio frequency demodulation module 1231, a synchronization module 1232, a service configuration parameter extraction module 1233, the service data extraction module 1234, a channel demodulation module 1235 and a channel decoding module 1236 source decoding module 1237, wherein

射频解调模块1231,用于接收发射台1220发送的射频信号,并将信号经中频/数字下变频进行解调,并发送给同步模块1232; RF demodulation module 1231, for receiving radio frequency signals transmitted by transmitting station 1220, and the intermediate frequency signal / digital frequency demodulating sends synchronization module 1232;

同步模块1232,用于对接收到的射频解调之后的数据进行同步形成传输帧,并发送给业务配置参数提取模块1233; Synchronization module 1232, the data after the received RF demodulator for synchronizing form a transmission frame, and sends service configuration parameter extraction module 1233;

业务配置参数提取模块1233,用于对传输帧的FIC部分进行信道解调和信道解码,并提取业务配置参数,信道解调包括OFDM解调和子载波解调,信道解码为信道纠错解码; Service configuration parameter extraction module 1233, a portion of the transmission frame of FIC channel demodulation and channel decoding, and extracts service configuration parameters, comprising a channel demodulator and OFDM demodulation subcarrier demodulation, channel decoding error correction decoding for the channel;

业务数据提取模块1234,根据提取的业务配置参数提取MSC中相应的业务数据,并发送给信道解调模块1235; Service data extraction module 1234 extracts the corresponding MSC service data according to the extracted service configuration parameters, and sends the channel demodulation module 1235;

信道解调模块1235,对MSC中提取出的相关业务数据进行信道解调,包括OFDM解调和子载波解调,并发送给所述信道解码模块1236; Channel demodulation module 1235, to the MSC extracted relevant service data channel demodulation, and a subcarrier demodulation of OFDM demodulation, and sends the channel decoding module 1236;

信道解码模块1236,对信道解调后的数据进行信道解码,包括时间解交织和信道纠错解码,并发送给所述信源解码模块1237; Channel decoding module 1236, the data channel demodulator for channel decoding, including time deinterleaving and channel decoding error correction, and sends the information source decoding module 1237;

信源解码模块1237,对信道解码后的数据进行信源解码。 Source decoding module 1237, the data after channel decoding source decoding.

上述即为本发明基于免费DAB的T-MMB收发系统的具体实施方式。 The above-described embodiment is the embodiment of the present invention DETAILED transceiver system based on T-MMB free of DAB.

本发明的T-MMB收发方法和系统,基于成熟的免费DAB系统, 一方面,由于DAB系统就是为手持移动终端而设计,因此本发明也同样适于移动接收,并且显示了令人满意的接收效果;另一方面,由于在FIC信道中的控制信息扩展了对于各个子业务信道的相关信息描述,使得本发明的方法和系统能够同时传输多路多媒体业务数据;由于本发明采用了高效的信道调制方案,如8DPSK和16DAPSK,克服了现有的DAB系统的频带效率低的缺点,采用了更强的纠错编码方案,如LDPC码,为多媒体数据,尤其是视频数据,提供了更强的抗干扰能力,使得整个方法和系统更适合视频节目传输; 最后,针对采用的高效信道调制方案,对由此带来的时变干扰增强的问题, 通过缩短OFDM的符号块长来进行补偿,从而保障了在频带利用率提高的同时,用户对于信号的质量要求。 T-MMB transceiving method and system of the present invention, based on proven free DAB system, on the one hand, due to the DAB system is designed as a handheld mobile terminal, thus the present invention is equally suitable for mobile reception, and displays satisfactory reception effect; on the other hand, since the control information of the FIC information channel extended description of the respective sub-traffic channels, such that the method and system of the present invention is capable of transmitting multimedia service data multiplexed simultaneously; Since the present invention employs efficient channel modulation scheme, and as 8DPSK 16DAPSK, overcome the low efficiency of the conventional DAB system band shortcomings, using a stronger error correction coding scheme such as LDPC codes, multimedia data, particularly video data, providing a stronger anti-jamming capability, so that the overall process and system is more suitable for transmission of video programs; Finally, the modulation scheme for the efficient use of the channel for the time-varying interference resulting enhancement of problem, be compensated for by shortening the long OFDM symbol block, whereby in the guaranteed bandwidth efficiency improved, user requirements for the quality of the signal.

总之,相比其它制式的移动多媒体技术,本发明具有频点可用性好;频带利用率高,支持便携和移动接收;接收机复杂度低,容易实现等优点。 In short, compared to other standard mobile multimedia technology, the present invention has a good availability of frequency; high bandwidth efficiency, to support portable and mobile reception; low receiver complexity, easy to implement and so on.

以上所述,仅为本发明的较佳实施例而已,并非用于限定本发明的保护范围,凡在本发明的精神和原则之内所做的任何修改、等同替换、改进等, 均应包含在本发明的保护范围之内。 The above are only preferred embodiments of the present invention but are not intended to limit the scope of the present invention, where any changes made within the spirit and principle of the present invention, equivalent substitutions, improvements should be included within the scope of the present invention.

Claims (18)

1. 一种基于免费DAB的地面移动多媒体广播收发方法,该方法包括:发端,根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、信道编码,将编码后的业务数据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中并根据业务数据的子载波调制方式,确定MSC中对应的容量单元CU的大小;基于DAB快速信息信道FIC中的快速信息组FIG,将业务数据对应的子信道信息等在T-MMB的FIC中进行标识;对MSC和FIC数据采用新的信道编码和调制方式;对MSC和FIC的编码码元进行信道调制,形成T-MMB传输帧,然后经过射频调制发送出去;收端,对接收到的信号进行射频解调和同步,得到T-MMB传输帧;对传输帧中FIC进行信道解调和信道解码,提取业务的子信道信息,根据该信息对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码。 Terrestrial mobile multimedia broadcast transceiving method 1. Based on free DAB, the method comprising: originating, according to a preset configuration parameters of the multimedia service, service data sequentially source coding, channel coding, the encoded service data to time division multiplexing fits in the T-MMB system main service channel MSC and according to sub-carrier modulation of traffic data, determining the size of the MSC corresponding to the capacity of the unit CU; fast packet FIG DAB fast information channel FIC is the sub-channel information service data corresponding to like in T-MMB of the FIC identifier; to the MSC and FIC data using the new channel coding and modulation mode; encoded symbols MSC and the FIC channel modulation, is formed T-MMB transmission frame , and transmitted via the RF modulator; receiving side, the received RF signal and synchronous demodulation, to give T-MMB transmission frame; frame transmission channel FIC demodulation and channel decoding, extracting information services sub-channel, according to the information related to the MSC in the traffic data channel demodulation sequentially, channel decoding and source decoding.
2. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述对业务数据进行的信源编码为:根据对应的多媒体业务配置参数,使用对应的信源编码器对业务数据进行信源编码。 According to one of the claims 1 based on mobile multimedia broadcast terrestrial DAB free transceiving method, characterized in that said source coding of the service data is: the corresponding multimedia service configuration parameters, using the corresponding channel according to a source encoder for encoding the service data source.
3. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述对业务数据进行的信道编码包括信道纠错编码和时间交织,其中信道纠错编码为低密度奇偶校验码LDPC,编码码率为A,时间交织为巻积交织,深度为D, Z)216。 According to one of the claims 1 to ground-based mobile multimedia broadcast of DAB free transceiving method, wherein said channel encoding traffic data comprises error correction encoding and channel interleaving time, which channel error correction coding is low density parity check code is the LDPC, coding rate is A, time interleaving for the convolving interleaving, a depth D, Z) 216.
4. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述对FIC进行的信道编码只包括信道纠错编码,其中信道纠错编码为低密度奇偶校验码LDPC,编码码率为A。 According to one of the claims 1 based on mobile multimedia broadcast terrestrial DAB free transceiving method, characterized in that the channel encoding of the FIC includes only channel for error correction coding, wherein the channel is a low density parity error correction coding check code LDPC, coding rate is A.
5. 根据权利要求1所述的一种基于免费DAB的地面移一多媒体广播^方法,其特征在于,所述确定MSC中对应的CU的大小为:nx32bits,其中n二2代表业务数据采用DQPSK调制方式,n=3代表业务数据采用8DPSK调制方式,n=4、 5、 6...,分别代表M点差分幅度和相位联合键控MDAPSK,这里M=2n>8。 According to claim 1, one of the shift based on a multimedia broadcast ^ free DAB ground, wherein said determining a size corresponding MSC CU is: nx32bits, wherein n = 2 represent business data using DQPSK modulation, n = 3 8DPSK represent business data using the modulation scheme, n = 4, 5, 6 ..., M respectively represent differential points on amplitude and phase shift keying MDAPSK, where M = 2n> 8.
6. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述信道调制包括子栽波调制和OFDM调制。 According to one of the claims 1 to ground-based mobile multimedia broadcast of DAB free transceiving method, wherein the plant comprises a sub-channel modulation and OFDM modulation wave modulation.
7. 根据权利要求6所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述的子载波调制为:对于MSC来说,可以采用4点差分移相键控DQPSK、 8点差分移相键控8DPSK、 M点差分幅度和相位联合键控MDAPSK,这里M-2V8,n-4、 5、 6...;对于FIC来说,可以采用2点差分移相键控DBPSK、 4点差分移相键控DQPSK。 According to one of the claim 6, the ground-based mobile multimedia broadcast of DAB free transceiving method, wherein said subcarrier modulation: for MSC, it can be a 4-point differential phase shift keying the DQPSK, differential phase shift keying 8:00 8DPSK, M-point difference on amplitude and phase shift keying the MDAPSK, where M-2V8, n-4, 5, 6 ...; FIC for it to be 2:00 using differential phase shift keying DBPSK, 4-point differential phase shift keying DQPSK.
8. 根据权利要求6所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述OFDM调制为:根据系统的工作频段和符号映射方式确定OFDM的传输模式,当MSC只使用DQPSK子载波调制时,按照DAB的规范确定OFDM的传输模式;当MSC中使用了8DPSK或M-DAPSK子载波调制时,所述M为16、 32或64中的一种或任意组合,若T-MMB的工作频点为Band III,则采用传输模式IV进行OFDM调制,若T-MMB的工作频点为L-Band,则采用传输模式III进行OFDM调制。 6, according to one of the claims based on mobile multimedia broadcast terrestrial DAB free transceiving method, characterized in that the OFDM modulation of: determining a transmission mode according to the operating frequency and OFDM symbol mapping systematic manner, only when MSC when using DQPSK subcarrier modulation, OFDM transmission mode is determined in accordance with specifications of DAB; when used in 8DPSK MSC or M-DAPSK subcarrier modulation, where M is one or any combination of 16, 32 or 64, if T-MMB working frequency of Band III, IV transmission mode is used for OFDM modulation, if the T-MMB working frequency to L-Band, the transmission mode III is used for OFDM modulation.
9. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述形成T-MMB传输帧为:使用MSC信道内容、FIC信道内容和同步信道内容形成T-MMB传输帧;同步信道内容按照DAB的规范形成0 According to claim 1, wherein one of the ground-based mobile multimedia broadcast of DAB free transceiving method, wherein the transmission frame is formed as a T-MMB: content channel using MSC, the FIC channel and sync channel content form a T -MMB transmission frame; synchronization channel content is formed in accordance with the DAB specification 0
10. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述将传输帧进行射频调制为:将传输帧信号搬移到BandIII或L Band。 10. A method according to claim 1 based on mobile multimedia broadcast terrestrial DAB-free transmission and reception method, wherein the transmission frame is modulated RF: moving the transmission frame signal to BandIII or L Band.
11. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述将业务数据对应的子信道信息等在T-MMB系统FIC中进行标识为:所述子信道信息包括:子信道标识字段,用于标识业务数据占用的子信道;开始地址字段,用于标识子信道的第一个CU的地址;子载波调制类型,用于标识使用的子载波调制方式;保护级别,用于标识信道纠错编码码率;子信道大小,用于标识业务数据使用的CU个数;信源编码标识字段,用于标识业务数据的信源编码类型。 According to claim 1, wherein one of the ground-based mobile multimedia broadcast of DAB free transceiving method, wherein said service data corresponding to the sub-channel information and the like identified as the FIC T-MMB system: the sub-channel information comprising: a subchannel identification field, for identifying the data traffic subchannel occupies; start address field, the first address for identifying a subchannel CU; subcarrier modulation type identified for the subcarrier modulation used embodiment; protection level, for identifying the channel error correction coding rate; subchannel size, traffic data for identifying the number of CU use; source coding identifier field for identifying the type of source coding service data.
12. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所迷对传输帧中FIC进行信道解调和信道解码为:对传输帧中的FIC信息进行OFDM解调、子载波解调和LDPC解码。 12. According to one of the claims 1 based on mobile multimedia broadcast terrestrial DAB free transceiving method, characterized in that the fan frame transmission channel FIC demodulation and channel decoding is: FIC information of the transmission frames to OFDM demodulation, and sub-carrier demodulation LDPC decoding.
13. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述提取业务的相应配置参数为:根据信道解码后的FIC信息,提取相应业务对应的子信道信息。 13. A method according to claim 1 based on mobile multimedia broadcast terrestrial DAB free transceiving method, characterized in that the corresponding configuration parameter of the service is extracted: the FIC channel decoding information, extracting the corresponding sub corresponding service channel information.
14. 根据权利要求1所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码为:根据提取的相应业务的子信道信息,提取MSC中对应的业务数据,并对该业务数据依次进行信道解调、信道解码和信源解码。 14. According to one of the claims 1 to ground-based mobile multimedia broadcast of DAB free transceiving method, wherein, said traffic related to the MSC in the data sequentially channel demodulation, channel decoding and source decoding is: The sub-channel information corresponding to the extracted service extracts the service data corresponding to the MSC, and sequentially demodulates the traffic channel data, channel decoding and source decoding.
15. 根据权利要求14所述的一种基于免费DAB的地面移动多媒体广播收发方法,其特征在于,所述对业务数据依次进行信道解调、信道解码和信源解码为:信道解调包括OFDM解调和子载波解调;信道解码包括时间解交织和信道纠错解码;信源解码按照子信道信息中信源编码类型进行对应的信源解码。 15. A method according to claim 14 based on mobile multimedia broadcast terrestrial DAB free transceiving method, characterized in that said service data sequentially channel demodulation, channel decoding and source decoding is: OFDM channel demodulator comprising demodulation and subcarrier demodulation; channel decoding comprises time deinterleaving and channel error correction decoding; source decoder for source decoding corresponding to the sub-channel information according to the type of source coding CITIC.
16. —种基于免费DAB的地面移动多媒体广播收发系统,其特征在于:该系统包括:网络控制中心NCC、发射台和接收机,其中,所述NCC,用于将多媒体广播业务数据传送给所述发射台;所述发射台,用于接收来自所述NCC的多媒体广播业务数据,根据预设的多媒体业务配置参数,对业务数据依次进行信源编码、信道编码,将编码后的业务数据以时分复用的方式嵌入T-MMB系统的主业务信道MSC中并根据业务数据的子载波调制方式,确定MSC中对应的容量单元CU的大小;基于DAB快速信息信道FIC中的快速信息组FIG,将业务数据对应的子信道信息等在T-MMB的FIC中进行标识;对MSC和FIC数据采用新的信道编码和调制方式;对MSC和FIC的编码码元进行调制,形成T-MMB传输帧,然后经过射频调制发送出去;所述接收机,对接收到的信号进行射频解调和同步,得到T-MMB传输帧;对传输 16. - kind of mobile multimedia broadcast terrestrial free-based DAB transmitting and receiving system, characterized in that: the system comprises: an NCC network control center, transmitting station and a receiver, wherein said an NCC, for multimedia broadcast service data is transmitted to the said transmitting station; said transmitting station, for receiving a multimedia broadcast service data from the NCC, the multimedia service according to a preset configuration parameters, service data sequentially source coding, channel coding, the encoded service data time-division multiplexing embedding T-MMB system main service channel MSC and according to sub-carrier modulation of traffic data, determining the size of the MSC corresponding to the capacity of the unit CU; fast packet FIG DAB fast information channel FIC is, the sub-channel information service data corresponding to like in T-MMB of the FIC identifier; to the MSC and FIC data using the new channel coding and modulation mode; encoded symbols MSC and FIC is modulated form T-MMB transmission frame , then sends out through the RF modulator; the receiver, the received RF signal and synchronous demodulation, to give T-MMB transmission frame; transmission 中FIC进行信道解调和信道解码,提取业务的子信道信息,根据该信息对MSC中的相关业务数据依次进行信道解调、信道解码和信源解码。 The FIC channel demodulation and channel decoding, extracting information services sub-channel, to the MSC in the related traffic data sequentially based on the information channel demodulation, channel decoding and source decoding.
17. 根据权利要求16所述的一种基于免费DAB的地面移动多媒体广播收发系统,其特征在于,所述发射台包括接收模块、信源编码模块、信道编码模块、信道调制模块和射频调制模块,其中,所述接收模块,用于接收来自所述NCC的多媒体广播业务数据和业务配置参数,生成FIC,并将业务数据转发给所述信源编码模块;所述信源编码模块,对所述接收模块转发来的业务信号进行相应的信源编码,然后将信源编码后的数据送给所述信道编码模块;所述信道编码模块,对接收的信源编码后的业务信号和FIC信号进行相应的信道编码;所述信道调制模块,对信道编码后的数据进行子载波调制和OFDM调制,形成传输帧;所述射频调制模块,用于将接收到的传输帧信号调制到预定的频点上,发送给所述接收才几。 17. A method according to claim 16 based on mobile multimedia broadcast terrestrial DAB free reception system, characterized in that said transmitting station comprises a receiving module, a module source coding, channel coding block, a modulation module and a radio frequency channel modulation module wherein, the receiving module, for receiving a multimedia broadcast service data and service configuration parameters from the NCC to generate the FIC, and forwards the service data to the source coding module; the source coding block, on the said receiving module forwards the service signal corresponding to the source coding and the source coded data to said channel coding module; the channel coding module, traffic signals and the FIC signal received source coding corresponding channel coding; the channel modulation module, the data after channel coding subcarrier modulation and OFDM modulation, form a transmission frame; the RF modulation module, for transmitting a frame signal modulation received to a predetermined frequency point, transmitted to the receiver only a few.
18. 根据权利要求16所述的一种基于免费DAB的地面移动多媒体广播收发系统,其特征在于,所述T-MMB接收机包括射频解调模块、同步模块、业务配置参数提取模块、业务数据提取模块、信道解调模块、信道解码模块和信源解码模块,其中,射频解调模块,用于接收发射台发送的射频信号,并将信号经中频/数字下变频进行解调;同步模块,用于对接收到的射频解调之后的数据进行同步形成传输帧;业务配置参数提^Mt块,用于对传输帧的FIC部分进行信道解调和信道解码,并提取业务配置参数,信道解调包括OFDM解调和子载波解调,信道解码为信道纠错解码;业务数据提^Mt块,根据提取的业务配置参数提取MSC中相应的业务数据,并发送给信道解调4莫块;信道解调模块,对MSC中提取出的相关业务数据进行信道解调,包括OFDM解调和子载波解调,并发送给所述信 18. A method according to claim 16 based on mobile multimedia broadcast terrestrial DAB free reception system, characterized in that the T-MMB demodulation module comprises a radio frequency receiver, a synchronization module, a service module configuration parameter extracting traffic data extraction module, a channel demodulation block, a channel decoding and source decoding module block, wherein, the RF demodulating means for receiving a radio frequency signal transmitting station is transmitted, demodulates the frequency signal at an intermediate frequency and / or digital; synchronization module, RF demodulator for the data after the received synchronous transport frame is formed; ^ Mt service configuration parameters mentioned block portion of the transmission frame for the FIC channel demodulation and channel decoding, and extracts service configuration parameters, channel de modulation of OFDM demodulation and subcarrier demodulation, channel decoding to channel error correction decoding; service data mentioned ^ Mt blocks, the extracted service configuration parameter extraction according to MSC corresponding service data, and sends the channel demodulator 4 mo block; channel demodulation module, to the MSC extracted relevant service data channel demodulation, and a subcarrier demodulation of OFDM demodulation, and sends the channel 解码模块;信道解码^t块,对信道解调后的数据进行信道解码,包括时间解交织和信道纠错解码,并发送给所述信源解码模块;信源解码模块,对信道解码后的数据进行信源解码。 Decoding module; channel decoding ^ t block of data channel demodulation channel decoding, comprising a time de-interleaving and channel error correction decoding, and sends the information source decoding module; source decoding module, after the channel decoding source decoding data.
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