CN101635787B - 改善接收性能的数字广播发射/接收系统及信号处理方法 - Google Patents

改善接收性能的数字广播发射/接收系统及信号处理方法 Download PDF

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CN101635787B
CN101635787B CN2009101670851A CN200910167085A CN101635787B CN 101635787 B CN101635787 B CN 101635787B CN 2009101670851 A CN2009101670851 A CN 2009101670851A CN 200910167085 A CN200910167085 A CN 200910167085A CN 101635787 B CN101635787 B CN 101635787B
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朴义俊
张龙德
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Samsung Electronics Co Ltd
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Abstract

一种改善接收性能的数字广播发射/接收系统及信号处理方法。根据本发明的数字广播发射机包括：数据预处理器，处理强健数据并产生预定格式的强健数据包；TS流产生器，将强健数据包与正常数据包组合以产生预定格式的TS流；随机化器，对从TS流产生器输出的TS流进行随机化；卷积编码器，对于从随机化器输出的数据的强健数据执行卷积编码；以及RS编码器，对于从卷积编码器输出的数据执行RS编码。因此，可在较差的多径信道中改善数字广播接收性能，同时保持与现有发射/接收系统的兼容性。

Description

改善接收性能的数字广播发射/接收系统及信号处理方法
本申请是申请日为2005年7月15日、申请号为200580023761.8、题为“改善接收性能的数字广播发射/接收系统及信号处理方法”的专利申请的分案申请。
技术领域
本发明涉及一种数字广播发射/接收系统，更具体地说，本发明涉及一种用于加强强健流(robust stream)在较差信道环境中的接收性能，从而可同时改善正常流(normal stream)的接收性能的数字发射/接收系统及其信号处理方法。
背景技术
高级电视系统委员会残留边带(ATSC VSB)方法是面向美国的地面波数字广播系统，其为单载波方法并且每312个段单位使用一个场同步。因此，在较差的信道中，特别是在多普勒衰减信道中，接收性能并不好。
图1是根据ATSC数字电视(DTV)标准的普通的面向美国的地面波数字广播系统的发射机/接收机的框图。图1的数字广播发射机具有：随机化器(110)，用于对MPEG-2TS进行随机化；链接编码器形式的里德-所罗门(RS)编码器(120)，用于纠正由信道产生的差错；交织器(130)(B＝52，M＝4)，以及2/3比率的格状编码器(140)。将编码的数据映射在8电平符号中，并且如图2所示，将场同步和段同步插入其中。此后，将导频插入数据，对数据进行VSB调制，将其上变换为RF并进行发送。
同时，图1的数字广播接收机按照数字广播发射机的相反顺序将RF信号降低到基带，对降低的信号进行解调和均衡，执行信道解码并恢复原始信号。图2示出面向美国的DTV系统的残留边带(VSB)数据帧。在图2中，一帧包括两场并且一场具有312个数据段以及场同步段。一段具有4符号的段同步以及828符号的数据符号。
如图1所示，数字广播发射机通过随机化器(110)对MPEG-2TS进行随机化。通过作为外编码器的RS编码器(120)对随机化的数据进行外编码，并通过交织器(130)来分散外编码的数据。通过格状编码器以12符号单位对交织的数据进行内编码，并且将内编码的数据映射在8电平符号中，并且如图2所示，将场同步和段同步插入其中。此后，所述数据具有用于产生导频的DC偏移，对所述数据进行VSB调制，将其上变换为RF信号并进行发送。
同时，图1的数字广播接收机通过调谐器/IF(未示出)将通过信道接收的RF信号转换为基带信号。对基带信号进行同步检测并通过解调器(210)对其进行解调，通过均衡器(220)补偿由信道多径造成的失真。通过格状解码器(230)对均衡的数据进行纠错并将其解码为符号数据。通过去交织器(240)对由发射机的交织器(130)分散的解码的数据进行重排，并通过RS解码器(250)对去交织的数据进行纠错。通过去随机化器(260)对纠错的数据进行去随机化，并且所述数据输出为MPEG-2TS。
在图2的面向美国的地面波DTV系统的VSB数据帧中，一段相应于一个MPEG-2包。在图2中，一帧包括两场，一场具有312个数据段以及场同步段。一段具有4符号的段同步以及828符号的数据符号。段同步和场同步是用于同步和均衡的同步信号。场同步和段同步是已知序列并且在均衡器中用作训练数据。
图1的面向美国的地面波数字电视系统的VSB方法是单载波系统，并且存在缺点，这是因为图3的格状编码器的纠错能力不足够强，所以需要较大的输出能量来改善在较差信道环境中的接收性能。
发明内容
技术问题
本发明的一方面在于提供一种数字广播发射/接收系统及其信号处理方法，所述系统用于通过将VSB方法的面向美国的地面波数字电视(DTV)系统中的现有传输类型的正常流与较差信道环境下的改善的接收性能的强健流组合来改善接收性能。
技术方案
根据本发明的数字广播发射机可包括：强健数据预处理器，用于处理强健数据并产生特定格式的强健数据包；TS流产生器，用于将强健数据包与正常数据包组合，并产生特定格式的TS流；随机化器，用于对从TS流产生器输出的TS流进行随机化；卷积编码器，用于对从随机化器输出的数据的强健数据执行卷积编码；以及交织器，用于对从卷积编码器输出的数据进行交织。
优选地，发射机可还包括：RS编码器，用于对从交织器输出的强健数据以及从随机化器输出的数据的正常数据执行RS编码。
更优选地，发射机可还包括：卷积交织器，用于对从RS编码器输出的数据进行交织。
此外，发射机可还包括：格状编码器，用于对RS编码之后由卷积交织器进行交织的数据执行格状编码。
优选地，卷积编码器可按特定方法对强健数据执行卷积编码，以便当同时应用格状编码器时，提高编码增益。
此外，交织器可按特定方法对强健数据执行交织，以便当同时应用卷积编码器和格状编码器时，提高编码增益。
此外，卷积编码器可产生用于强健数据的特定奇偶校验，并输出强健数据和奇偶校验。
此外，卷积编码器可按1/2比率对奇偶校验进行打孔。
同时，卷积编码器可跳过按1/2比率对奇偶校验进行打孔，并按照原样输出强健数据和奇偶校验。
此外，格状编码器可执行格状编码，并且在输入打孔的奇偶校验的情况下输出4电平的映射值。
同时，根据本发明的数字广播发射机的信号处理方法包括：通过处理强健数据产生特定格式的强健数据包；将产生的强健数据包与正常数据包组合并产生特定格式的TS流；对TS流进行随机化；对随机化的数据的强健数据执行卷积编码；以及对卷积编码的数据进行交织。
同时，根据本发明的数字广播接收机可包括：解调器，用于接收并解调在特定位置插入强健数据的编码的信号；强健位置产生器，用于从解调的信号检测强健数据的位置；均衡器，用于对解调的信号进行均衡；turbo解码器，用于使用检测的强健数据的位置对从均衡器输出的信号的强健数据进行解码；去随机化器，用于对从turbo解码器输出的强健数据进行去随机化；以及强健数据处理器，用于处理并重建从去随机化器输出的强健数据。
turbo解码器可包括：格状解码器，用于对强健数据进行格状解码；以及卷积解码器，用于对格状解码的强健数据进行卷积解码。
格状解码器和卷积解码器可在解码时彼此交换解码可靠性信息。
此外，turbo解码器可还包括交织器和去交织器，其分别连接格状解码器和卷积解码器，并且可靠性信息可通过从去交织器到卷积解码器的一路径以及从交织器到格状解码器的另一路径进行彼此交换。
同时，根据本发明的数字广播接收机的信号处理方法可包括：接收并解调在特定位置插入强健数据的编码的信号；从解调的信号检测强健数据的位置；对解调的信号进行均衡；使用检测的强健数据的位置对均衡的信号的强健数据进行解码；对解码的强健数据进行去随机化；以及处理并重建去随机化的强健数据。
有益效果
根据本发明，为了改善面向美国的地面波DTV系统的ATSC VSB方法的接收性能，将强健流和正常流组合以产生MPEG-2包，对MPEG-2包进行编码和发送，并且接收机检测强健流的位置，并通过使用两个额外的解码器进行信息交换来对所述流进行解码，从而可改善强健流的接收性能。
因此，保持与现有系统的兼容性，并改善了在较差信道环境中的接收性能。
附图说明
图1是用于示出普通数字广播(ATSC VSB)发射/接收系统的框图；
图2是用于示出ATSC VSB数据的帧结构的示图；
图3是用于示出格状编码器的结构的示图；
图4是用于示出从根据本发明的数字广播发射机产生的MPEG包的结构的示图；
图5是用于示出从根据本发明的格状编码器输出的数据格式的示图；
图6是用于示出根据本发明的数字广播发射机的示图；
图7是用于示出根据本发明的卷积编码器的结构的示图；以及
图8是用于示出根据本发明的数字广播接收机的结构的示图。
具体实施方式
图6是用于示出根据本发明的双流EVBS系统的数字广播发射机的框图。
数字广播发射机包括：RS编码器(301)和第一包格式器(303)，用于预处理强健数据以改善强健数据的接收性能；第二包格式器(305)，用于处理正常数据；以及TS流产生器(307)，用于将从第一包格式器(303)输出的强健数据与从第二包格式器(305)输出的正常数据组合以输出MPEG包。
此外，数字广播发射机包括：随机化器(310)，用于对从TS流产生器(307)产生的MPEG包进行随机化；卷积编码器(330)，用于对强健流部分进行编码；交织器(340)；RS编码器(320)，用于对从交织器(340)输出的强健流连同正常流进行编码；卷积交织器(350)以及格状编码器(360)。
在根据本发明的数字广播发射机中，将从RS编码器(320)输出的数据未经变化地输入到格状编码器(360)。因此，如果在RS编码器(320)之前采用卷积编码器(330)，则可使用从RS编码器(320)输出的数据与格状编码器(360)执行信息交换。也就是说，发射机可使用卷积编码的强健流与格状编码器(360)交换信息，从而可加强较差信道环境下的接收性能。
图4示出由TS流产生器(307)产生的MPEG包的结构。TS流产生器(307)重建新的MPEG包，所述MPEG包具有输入的正常流和强健流两者。将强健流固定在特定位置并将其发送，并且AF头可自由地调整强健流的量。
图5示出从格状编码器(360)输出的数据的格式。如果使用MPEG包的特定位置发送强健流，则强健流通过卷积编码器(330)和交织器(340)，并以图5的格式相继聚集。因此，可对于这种格式的数据简单地执行按帧单位操作的最大后验概率(MAP)解码，从而改善强健流的接收性能。
图7示出根据本发明的卷积编码器的结构。可按各种形式来实现卷积编码器(330)的结构。可根据用法来使用如图7所示的打孔。将系统递归卷积的输入输入为“d1”，其作为格状编码器(360)的编码器差分编码器的输入，将奇偶校验输入为在“d0”中。此时，可按照原样输出奇偶校验或者对其进行打孔以包括1或0。因为“d0”变成Z1，所以插入“1”的点变成具有“-3、-1、5、7”映射值的4VSB，插入“0”的点变成具有“-7、-5、1、3”映射值的4VSB。也就是说，输出值通过打孔交替地变成8VSB或4VSB，并且加强了由格状编码器(360)产生的编码增益。
图8示出根据本发明的数字广播接收机的结构。接收机包括：解调器(410)，用于解调通过信道接收的信号；均衡器(420)，用于补偿由信道多径产生的失真；维特比解码器(430)，用于纠错并在符号数据中执行解码；去交织器(440)，用于重排解码的数据的分散数据；RS解码器(450)，用于对去交织的数据进行纠错；以及去随机化器(460)，用于对纠错的数据进行去随机化。通过上述结构处理接收的信号的正常数据。
同时，接收机还包括：强健位置产生器(470)，用于从通过解调器(410)解调的数据流检测强健数据的位置，以及turbo解码器(480)，用于使用检测的强健数据的位置对强健数据进行解码。
turbo解码器(480)包括格状解码器(未示出)以及卷积解码器(未示出)两个解码器，并通过彼此交换解码可靠性信息来增强接收性能。在接收机中，卷积解码器的输出与RS编码器的输入相同。
此外，turbo解码器(480)包括去交织器(未示出)和交织器(未示出)，其间分别连接格状解码器和卷积解码器。交织器(未示出)具有将发射机的交织器(340)和卷积交织器(350)组合的形式，执行两个交织器(340，350)的交织，并变成用于将解码可靠性信息从格状解码器传送到卷积解码器的路径。此外，去交织器(未示出)执行去交织以倒转所述交织器的操作，并变成用于将解码可靠性信息从卷积解码器传送到格状解码器的路径。
随后，turbo解码器(480)的卷积解码器的输出重建强健流并将其输入到强健数据处理器(500)以执行RS解码。
根据本发明，为了改善面向美国的地面波DTV系统的VSB方法的接收性能，将正常数据和强健数据组合以变成MPEG-2包，接收机在所述包中检测强健数据的位置，并通过格状解码器和卷积解码器之间的信息交换来对强健数据进行解码，从而可在较差的多径信道环境中改善强健数据的接收性能。
此外，根据本发明的数字广播发射/接收方法与ATSC建议的现有接收机兼容，并且能够改善面向美国的地面波数字广播系统的ATSC VSB方法的接收性能。

Claims (6)

1.一种数字广播接收机，包括：
解调器，用于接收并解调包括强健数据和正常数据的传输流；
检测器，用于检测强健数据在解调的传输流中的位置；
格状解码器，用于使用检测的强健数据的位置对强健数据进行格状解码；
卷积解码器，用于对格状解码的强健数据进行卷积解码；
强健数据处理器，用于对卷积解码的强健数据进行RS解码，
其中，所述强健数据被通过对数据进行预处理而进行了强健处理，
其中，格状解码器和卷积解码器在解码时彼此交换解码可靠性信息。
2.如权利要求1所述的数字广播接收机，其中，每隔预定数量的段而重复定位所述强健数据，并对所述强健数据进行交织。
3.如权利要求1所述的数字广播接收机，还包括：
强健数据处理器，用于对由所述卷积解码器卷积解码的强健数据执行里德-所罗门解码。
4.一种用于在数字广播接收机中处理流的方法，所述方法包括：
接收并解调包括强健数据和正常数据的传输流；
检测强健数据在解调的传输流中的位置；
使用检测的强健数据的位置对强健数据进行格状解码；
对格状解码的强健数据进行卷积解码；
对卷积解码的强健数据进行RS解码，
其中，所述强健数据被通过对数据进行预处理而进行了强健处理，
其中，在格状解码步骤和卷积解码步骤中，解码可靠性信息被交换。
5.如权利要求4所述的方法，其中，每隔预定数量的段而重复定位所述强健数据，并对所述强健数据进行交织。
6.如权利要求4所述的方法，还包括：
对卷积解码的所述强健数据执行里德-所罗门解码。
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