CN101120587B - 用于数字电视广播的纠错编码器及其方法 - Google Patents
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Abstract
提供了一种纠错编码器,并且更具体地,提供一种用于先进电视制式委员会(ATSC)的改进的传输方法的纠错编码器及其方法。用于数字电视广播的该纠错编码器,在本研究中建议,包括:健壮编码器,用于编码输入健壮编码的数据中的一位;预编码块,用于接收健壮编码的数据并执行预编码,以由此产生预编码的信号;以及网格编码块,用于在健壮编码的数据和预编码的信号上执行网格编码。
Description
技术领域
本发明涉及纠错码编码器,并且更具体地,涉及一种用于编码纠错码的装置及其方法,该纠错码被用在基于先进电视制式委员会(ATSC)的、地面数字电视广播系统的先进传输方法中。
背景技术
数字技术中的快速发展也影响了广播领域,并且刺激了广播网络和因特网之间的结合。然而,先进电视制式委员会(ATSC)的传统的地面电视(TV)广播方法有问题:广播不能在移动和便携式终端中接收,并且即使接收了,接收性能差。关于ATSC DTV标准和A/53的详细描述呈现在http://www.atsc.org。
图1是显示传统数字电视(DTV)传输块的框图。如附图中图示的,输入到传输块100的数据是串行数据流,其每个包括188字节的MPEG兼容的数据包,该数据包包括同步字节和187字节的有效载荷数据。输入的数据在数据随机化器101中被随机化,并且每个包被编码以包括用于前向纠错(FEC)的20字节的奇偶信息、Reed Solomon(RS)编码、以及1/6数据域交织(datafield interleaving)、以及2/3网格(trellis)编码。根据先进电视制式委员会(ATSC),数据随机化器101在所有有效载荷数据字节上执行XOR,该有效载荷数据字节输入到具有16位最大长度的伪随机二进制序列(PRBS),其在数据域的开始点被初始化。
RS编码器103接收随机化的数据,并通过添加用于FEC的20RS奇偶字节到187字节数据,产生每数据段总共207字节的数据。
在输入的包数据当中,在对应于段同步信号的同步数据上不执行随机化和FEC。
随后,包括在每个数据域的连续段中的各数据包,在数据交织器105中被交织,并且交织的各数据包被再次交织,并且在网格编码器107中被编码。网格编码器107通过使用输入到其的额外的两位产生以三位表达的数据码元流。输入的两位中的一位被预先编码,并且另一位经过4状态的网格编码以减少(reduce)为两位。输出的三位映射(map)到8级码元。网格编码器107包括12个并行的网格编码器和一些预编码器,以产生12个交织的和编码的数据序列。
将8级码元与段同步和域同步位序列117结合,该段同步和域同步位序列117从同步单元(未示出)传输到此,以产生用于传输的数据帧。随后,将导频(pilot)信号添加到导频加法器111。码元流在残余边带(VSB)调制器113中经过VSB抑制载波调制。最后在射频(RF)信号转换器115中将基带的8级码元流转换为射频信号。
ATSC数字地面TV广播的纠错码使用RS码作为外部码,并且使用由2/3网格码形成的链接码作为内部码。
图2是描述图1的网格编码器的结构的框图。图2示出在ATSC数字地面TV广播的纠错编码器中使用的网格编码器的结构,并且它示出基于该网格编码器的输出的8-VSB调制码元分配。
参照图2,网格编码器107包括预编码块和2/3网格编码块。来自数据交织器105的两位X1和X2输入到编码速率为2/3的网格编码块,以由此产生三输出位Z0、Z1和Z2。输出位Z0、Z1和Z2用8个码元分配,并且它们在VSB调制器113中经过8-VSB调制。网格编码器107的存储器的数量为两个,因此在解码期间网格状态的数量变为4。
然而,传统的8-VSB收发器由于可变的信道和多径现象,在室内和移动信道环境中提供失真的信号,并且由于这个原因,接收器中的信号接收性能差。为解决该问题,研究人员正在研究以开发具有强大的纠错功能的先进传输方案,并且它需要开发适于先进传输方案的优秀的纠错编码器,及其编码方法。
发明内容
技术问题
因此,设计为克服传统技术的缺点的本发明的一个目的,是提供一种用于数字电视(TV)广播纠错编码器及其方法。
本发明的另一目的是提供一种纠错编码器,其改进自传统的先进电视制式委员会(ATSC),适于双流(dual stream)传输方法的纠错。
从本发明的附图、详细描述和权利要求,本发明领域的技术人员将理解本发明的其它目的和优点。
技术解决方案
根据本发明的一个方面,提供了一种用于数字电视广播的纠错编码器,其包括:健壮(robust)编码器,用于编码输入到健壮编码的数据中的一位;预编码块,用于接收健壮编码的数据并执行预编码,以由此产生预编码的信号;以及网格编码块,用于在健壮编码的数据和预编码的信号上执行网格编码。
根据本发明的另一方面,提供了一种用于数字电视广播的纠错编码方法,其包括步骤:a)通过使用移位寄存器和XOR操作单元编码输入到健壮编码的数据中的一位;b)接收健壮编码的数据并执行预编码,以由此产生预编码的信号;以及c)在健壮编码的数据和预编码的信号上执行网格编码。
本发明提供一种用于数字电视广播的纠错编码器,包括:健壮编码器,用于编码输入健壮编码的数据中的一位;预编码块,用于接收健壮编码的数据并执行预编码,以由此产生预编码的信号;以及网格编码块,用于在健壮编码的数据和预编码的信号上执行网格编码,其中,健壮编码器基于以下各等式执行健壮编码: 其中表示异或(XOR)操作;以及X1(k)和X2(k)表示在时间k的从健壮编码器输出的第一位数据和第二位数据;Z2(k-1)表示在时间k、延迟1的Z的网格编码块输出位信号;X1’(k-d)表示在时间k、延迟d的输入健壮编码器的位数据,并且d是整数;其中,由预编码块接收的健壮编码的数据是X2(k)。
本发明还提供一种用于数字电视广播的纠错编码方法,包括步骤:a)编码输入到健壮编码的数据中的一位;b)接收健壮编码的数据并执行预编码,以由此产生预编码的信号;以及c)在健壮编码的数据和预编码的信号上执行网格编码,其中,在步骤a)中,基于以下各等式执行健壮编码: 其中表示异或(XOR)操作;以及X1(k)和X2(k)表示在时间k的从健壮编码器输出的第一位数据和第二位数据;Z2(k-1)表示在时间k、延迟1的Z的网格编码块输出位信号;X1’(k-d)表示在时间k、延迟d的输入健壮编码器的位数据,并且d是整数;其中,在步骤b)接收的健壮编码的数据是X2(k)。
有利的效果
本发明的技术通过将编码比率从2/3减少到1/3、并且将纠错编码器中的存储器的数量从二增加到四,能够改进纠错性能。虽然最后的编码比率从2/3改变到1/3,但是该纠错码器通过输出8个码元,仍然保持与使用8残余边带(VSB)方案的传统系统兼容。因此,本发明能够提供一种适于双流传输的内部纠错编码器。
附图说明
通过下面结合附图给出的优选实施例的描述,本发明的上面和其它目的和特征将变得明显,在附图中:
图1是示出传统DTV传输块的框图;
图2示出图1的网格编码器;
图3是图示根据本发明的实施例的内部纠错编码器的结构的框图;
图4是详细描述根据本发明的实施例的内部纠错编码器的框图;以及
图5是显示在传统编码器和本发明的纠错编码器中的、关于信噪比(SNR)的位错误率(BER)性能曲线的图。
具体实施方式
通过下面参照附图的各实施例的描述,本发明的其它目的和方面将变得明显,实施例在下文阐明。同样,考虑到关于相关技术的详细描述可能模糊本发明的各要点,在此将不提供该描述。以下,将参照附图,详细描述本发明的优选实施例。
图3是图示根据本发明的实施例的内部纠错编码器的结构的框图。图3的内部纠错编码器能够应用到数字地面电视(TV)广播的改进的传输方法。
参照图3,内部纠错编码器包括:健壮编码器10、预编码块20以及网格编码块30。健壮编码器10从交织器(未示出)接收一位输入信号X1’,并且输出对应于传统的内部纠错编码器的输入数据的X1和X2。预编码块20接收X2并输出Z2码元。网格编码块30以2/3编码比率接收X1和X2并输出Z1和Z0码元。本发明的内部纠错编码器除了传统的编码器,还包括健壮编码器10。由预编码块20和网格编码块30形成的网格编码器,遵循先进电视制式委员会(A/53)标准中定义的结构。因此,每个预编码块和网格编码块包括寄存器(D),用于存储位延迟值例如12位延迟值。内部纠错编码器最后输出Z0、Z1和Z2,并且编码比率变为1/3。虽然最后的编码比率为1/3,但是内部纠错编码器通过输出8码元,能够维持与传统的传输方案的设备的兼容性。
图4是详细描述根据本发明的实施例的内部纠错编码器的框图。
参照图4,如下面各等式中所示,输出对应于传统编码器的输入的位X1(k)和X2(k),该传统编码器在时间k接收输入位X1’(k)。
X1(k)=X1’(k-1)
X(k-d)表示在时间k、延迟d的X的位信号。
参照图4和等式1,本发明的纠错编码器通过使用总共四个存储器(即,在标准网格编码器中的两个存储器,以及在健壮编码器10中的两个存储器401和402),编码输入信号。
基于内部纠错编码器的输入的输出信号及其状态如表1和2中所示,该内部纠错编码器的输入根据等式1呈现。
表1
表2
由于健壮编码器10具有两个存储器,所以内部纠错编码器的存储器的总数量变为四。因此,解码后网格状态的数量变为16。
在本发明的说明书中,健壮编码的数据是健壮编码器10的输出信号X1和X2。
当如该实施例中所述进行内部纠错编码时,通过参照表1和2执行网格解码,接收部分能够改进它的接收器的性能。具体地,接收部分将接收信号转换为基带信号,执行均衡化以确定该接收信号的码元级,并且将确定的码元级解码为数据码元,使得码元级和其对应的状态如表1和2中所示。关于接收部分的详细描述呈现在韩国专利公开No.2004-64306。
<实验结果>
在此将描述关于图1中所示的传统编码器、和图4的内部纠错编码器的性能的计算机仿真结果。图5是显示在传统编码器和本发明的纠错编码器中的、关于信噪比(SNR)的位错误率(BER)性能曲线的图。在此,使用了加性高斯白噪声(AWGN)模型作为噪声信道,通过使用Monte Carlo(蒙特卡洛)仿真方法并且将全部错误除以传输的数据,计算错误率。
结果是本发明的内部纠错编码器与传统编码器相比,对于位错误率10-5,具有大约7dB的功率增益。
本发明的方法实现为程序,并存储在计算机可读的记录介质中,如CD-ROM、RAM、ROM、软盘、硬盘以及磁光盘等。由于本领域的普通技术人员能够容易地实现该过程,所以在此将不提供关于它的详细描述。
尽管已经对于某些优选实施例描述了本发明,然而对于本领域的技术人员将明显的是:可以进行各种改变和修改,而不脱离如权利要求中定义的本发明的范围。
Claims (5)
1.一种用于数字电视广播的纠错编码器,包括:
健壮编码器,用于编码输入健壮编码的数据中的一位;
预编码块,用于接收健壮编码的数据并执行预编码,以由此产生预编码的信号;以及
网格编码块,用于在健壮编码的数据和预编码的信号上执行网格编码,
其中,健壮编码器基于以下各等式执行健壮编码:
X1(k)=X1’(k-1)
X1(k)和X2(k)表示在时间k的从健壮编码器输出的第一位数据和第二位数据;Z2(k-1)表示在时间k、延迟1的Z的网格编码块输出位信号;X1’(k-d)表示在时间k、延迟d的输入健壮编码器的位数据,并且d是整数;
其中,由预编码块接收的健壮编码的数据是X2(k)。
3.如权利要求1所述的纠错编码器,其中健壮编码器通过使用两个移位寄存器和两个XOR操作单元产生健壮编码的数据X1和X2。
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PCT/KR2006/000538 WO2006088320A1 (en) | 2005-02-16 | 2006-02-16 | Improved encoder of e-8vsb forward error correction for digital television system of atsc |
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US10212009B2 (en) * | 2017-03-06 | 2019-02-19 | Blackberry Limited | Modulation for a data bit stream |
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WO2006088320A1 (en) | 2006-08-24 |
US20130077698A1 (en) | 2013-03-28 |
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CN101120587A (zh) | 2008-02-06 |
US20100201885A1 (en) | 2010-08-12 |
CA2597706A1 (en) | 2006-08-24 |
KR20060092143A (ko) | 2006-08-22 |
US9210429B2 (en) | 2015-12-08 |
US8325823B2 (en) | 2012-12-04 |
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