CN1231085A - 测量扩展谱通信系统内链路质量的方法和装置 - Google Patents
测量扩展谱通信系统内链路质量的方法和装置 Download PDFInfo
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Abstract
本发明是一种提供接收信号质量量度的新颖改进方法,它在闭环功率控制系统中发射机发射功率的控制上作了优化设计。本发明虽然在扩展谱通信系统的背景下描述,但是它同样也可以用于其它类型的通信系统。在本发明中,所描述的功率控制系统被用于控制从基站到移动站的发射功率(称为前向链路发射)。
Description
发明领域
本发明涉及通信。具体而言,本发明涉及一种用于控制无线通信系统中远地站发射功率的新颖和改进的方法与装置。
背景技术
码分多址(CDMA)调制技术是其中一种便于大量系统用户通信的技术。其它多址通信系统技术,例如时分多址(TDMA)和频分多址(FDMA)都是本领域内熟知的技术。但是CDMA的扩展谱调制技术与这些多址通信系统的调制技术相比具有明显的优势。在题为“利用卫星或陆基中继器的扩展码多址通信系统”的美国专利No.4,901,307中揭示了CDMA技术在多址通信系统中的应用,该专利已经转让给本发明的受让人,其内容作为参考文献包含在本文中。在题为“CDMA蜂窝电话系统中产生信号波形的系统和方法”的美国专利No.5,103,459中进一步揭示了CDMA技术在多址通信系统中的应用,该专利已经转让给本发明的受让人,其内容作为参考文献包含在本文中。
由于CDMA固有的宽带信号特征,信号能量可以在较宽的带宽上扩展从而构成频率分集。因此频率选择衰落只对CDMA信号带宽一小部分有影响。通过在从移动用户至两个或更多小区地点的即时链路上提供多条信号路径获得了空间或路径分集。而且通过使传播延迟不一的到达信号分开接收和处理实现了扩展谱处理,多路径环境得到了充分利用,从而可以获得路径分集。在题为“CDMA蜂窝电话系统中提供软切换的方法和系统”的美国专利No.5,101,501以及题为“CDMA蜂窝电话系统中分集接收机”的美国专利No.5,109,390中示出了路径分集的实例,这两项美国专利都已转让给了本发明的受让人并作为参考文献包含在本文中。
在用于数字通信系统话音传输的方法中,通过采用变速话音编码,提供了容量提高而语音质量不变的特殊优势。在题为“变速声码器”的美国专利No.5,414,796中详细示出了特别有用的变速语音编码器的方法和装置,该专利已转让给了本发明的受让人并作为参考文献包含在本文中。
在控制通信系统中移动站发射功率的有用方法中,移动站计数接收错误的帧。如果超过阈值,则移动站向基站发送报文。计数器周期性地复位。在题为“CDMA蜂窝电话系统中控制发射功率的装置和方法”的美国专利No.5,056,109中示出了这种方式控制发射功率的方法和装置,该项专利已转让给了本发明的受让人并作为参考文献包含在本文中。
在1996年3月29日提交的共同待批的题为“发射数据格式化方法和装置”的美国专利申请No.08/374,444中示出了提供较快功率控制的方法,该项发明都已转让给了本发明的受让人并作为参考文献包含在本文中。在该方法中,移动站每个反向业务信道帧发送一个比特指示前一前向业务信道帧的质量。如果接收的帧没有错误,则比特为“0”;如果接收的帧有错误,则比特为“1”。由于这些比特是编码和交织的,所以它们的接收没有错误。由于每帧上有帧质量指示符,所以移动站能够舍弃可能出错的功率控制比特。
但是这些提供功率控制的方法局限于接收的每帧数据最多只反馈一个信息有效位。衰落情况可能要求快得多的信息反馈。
发明内容
本发明是一种提供接收信号质量量度的新颖改进方法,它在闭环功率控制系统中发射机发射功率的控制上作了优化设计。本发明虽然在扩展谱通信系统的背景下描述,但是它同样也可以用于其它类型的通信系统。在本发明中,所描述的功率控制系统被用于控制从基站到移动站的发射功率(称为前向链路发射)。本发明同样可用于控制反向链路发射的功率,即从移动站到基站的发射。
附图的简要说明
通过以下结合附图对本发明的描述可以进一步理解本发明的特征、目标和优点,附图中相同的部分用同一标号表示,其中:
图1为典型的移动电话环境中本发明的示意图;
图2为本发明功率控制系统的框图;
图3为本发明中用于确定质量量度的第一实施例的流程图;以及
图4为本发明中用于确定质量量度的第二实施例的流程图。
实施发明的较佳方式
参见图1,系统控制器10从公用电话网(PSTN)(未示出)接收数据并向其提供数据。基站12和14从系统控制器10接收数据并向其提供数据。基站12在信号路径20和22上向移动站18发送数据,称为前向链路发送。信号路径22是基站12到移动站18的直接路径。信号路径20是反射信号路径,基站12发送的信号从反射源16反射。虽然图1中作为方框示出,但是反射源16实际上是一种人工环境,移动站18在其中操作,它典型的情况是建筑物或其它结构。
在示意性的实施例中,移动站18分别解调路径20和22上的信号并将解调信号组合起来。在前述美国专利No.5,109,390中详细描述了能将不同传播路径上接收的信号组合起来的设计和实现方案。
此外基站14在路径24上发射数据,该路径可以是或者也可以不是打算用作移动站18接收的路径。如果移动站18靠近基站12和14所服务小区的边界,则移动站18可以处于软切换状态,在该状态下基站12和14向基站18冗余地发射数据。在这种情况下,信号将分别解调和组合。在前述美国专利No.5,101,501中详细描述了软切换的方法。如果基站14发射的信号无意用作移动站18的接收,则在示意性的实施例中信号将以频带噪声的形式出现在移动站18面前。
向移动站18发射的质量由路径20和22上信号强度决定,并且如果移动站18处于软切换状态下则由路径24上的信号决定。根据发射质量,移动站18在信号路径26上向基站12返回信号指示接收信号的质量。如果处于软切换状态下的移动站18,则该信号将由基站14接收。
在示意性的实施例中,数据在20毫秒帧内发射并且在每幅接收帧内发送16次接收帧质量指示或每隔1.25毫秒发送一次。本发明同样可用于连续发射系统和利用不同帧长度和速率提供信号质量指示的系统。
用于控制远地基站发射功率的信号质量优化量度是业务信道上的信噪比(业务Eb/Nt)。在示意性的实施例中,信号质量量度系统测量(业务Eb(f)/Nt(f))的单位指针值并随后根据下列方程(1)描述的分集接收机组合权重产生总体(业务Eb/Nt)。
这里ωf是分集接收机用来组合解调指针从而提供改进的发射数据估值的权重因子,Eb(f)是指针(f)上一个业务数据比特的能量而Nt(f)是指针(f)上信号遭受的干扰。
当进行优化组合时,总体业务Eb/Nt是Eb(f)/Nt(f)的单位指针值之和。因此另一替换方法是简单地将单位指针值相加以得出总体业务Eb/Nt。
Nt(f)包括热噪声、其它小区的干扰和同一小区其它路径信号的干扰。
如果本发明确定基站12至移动站18发射信号路径22上接收的指针的质量,则Nt(f)将包含信号路径24上基站14发射引起的干扰和信号路径20引起的多路径干扰。
在本发明示意性实施例中,对指针(f)上业务信道信号的干扰根据下列方程(3),通过测量总的频带内能量并减去同一路径上的非干扰能量得到。
Nt(f)=Io-Ior(f), (3)
这里Io是频带内接收的总能量而Ior(f)是指针(f)被锁定的单一路径上源于基站14的信号(包括向其它用户的发射)的总功率。由于在CDMA中单一路径上发射的信号互相正交,所以数值Ior(f)是不影响接收信号质量的非干扰功率的量度。
导频分数方法
图3的流程图示出了称为导频分数方法的产生质量量度的第一示意性实施例。在第一示意性实施例中,将借助测量路径22上所提供信号的质量作为背景描述质量量度。为了提供最终的功率控制反馈,将施行相似的操作来估计路径20和24上接收信号的信噪比,信号随后根据上述方程(1)组合起来。
在本发明第一示意性实施例中,基站12借助信令数据发射指示基站12所发射信号总能量的分数,该基站被用来发射导频信号。该值由方程(4)给出:
导频Ec是基站发射“子码”内的能量,这里子码的时段反比于扩展率并且Ior是由基站12发射的接收带宽归一化的信号总能量。因此导频分数是无单位的。
参见图2,导频分数信号由报文生成器(MSG GEN)57生成。在示意性实施例中,导频分数报文被提供给编码器55并与前向链路业务数据组合。在替换实施例中,导频分数报文作为信令数据分别在业务信道或者诸如sync信道之类的分离信令信道上提供。编码器55将导频分数报文与前向链路数据组合。编码符号随后提供给对发射数据进行调制的调制器53。在示意性实施例中,调制器53是前述美国专利Nos.4,901,307和5,103,459中详细描述的码分多址(CDMA)调制器。在示意性实施例中,导频分数报文在业务信道上调制。但是由于不管与之通信的是哪一个移动站,该数值都是相同的,所以可以在由所有与基站18通信的移动站监视的公用信道上提供信息。
调制信号被提供给上转换和放大经天线64发射的信号的发射机(TMTR)62。
发射信号由移动站18(图3的方框102)经天线66接收并通过去多路复用器提供给接收机(RCVR)78。接收机78下转换、放大和滤波接收到的信号并将信号提供给伪随机噪声解扩展器(PNDESPREAD)80。如同前述美国专利Nos.4,901,307和5,103,459中详细描述的那样,解扩展器80根据伪噪声编码解扩展接收信号。PN解扩展信号被提供给解扩展器(WALSH DESPREAD)90,正如在美国专利Nos.4,901,307和5,103,459中详细描述的那样,该解扩展器根据所分配业务信道Walsh序列解扩展信号。
Walsh扩展信号被提供给解码器96,该解码器解码信号并将解码信号提供给去多路复用器(DE-MUX)98,该去多路复用器从前向链路业务数据中分离导频分数报文。导频分数报文被提供给功率控制处理器100。功率控制处理器100可以利用编程为完成上述功能的微处理器或微控制器实现。余下的业务数据被提供给移动站18的用户。
过程中的下一步骤是移动站18测量所接收导频子码的能量。基站12发射的导频信号由移动站18的天线66接收并经去多路复用器68提供给接收机78。接收机78下转换和放大接收的信号并提供给PN解扩展器80。在示意性实施例中,接收的信号是带I和Q分量的正交相移键控(QPSK)信号。应该指出的是,本发明同样可用于其它信号变换,例如二进制相移键控(BPSK)调制。
解扩展的导频信号被提供给从导频符号中去除噪声的滤波器86。滤波的符号被提供给将I信道和Q信道上的导频信号的解扩展信号幅值平方并求和的平方均值(I2+Q2)88。平方值向功率控制处理器100提供了导频信道上子码的能量估值(导频Ec)。
功率控制处理器100从方程(5)计算到达指针(f)的非干扰能量(Ior(f))的总数。
or(f)=Pilot Fraction-1 x Pilot Ec. (5)
接收机78(方框108内)测量并向控制处理器100提供指示频带能量的信号。值得指出的是,接收机78典型地包含自动增益控制(AGC)放大器(未画出),频带能量的测量是接收机操作的结果。
在方框110内,控制处理器100根据下列方程(6)计算指针(f)经受的干扰值,用Nt(f)表示。
Nt(f)=Io-or(f). (6)
导频散射方法
在本发明第二实施例中,未向移动站18提供导频分数比,而是通过根据所接收导频信号能量内能量变化编译信息估计非干扰噪声(Nt(f))。
在方框152内,指针(f)的估计噪声由功率控制处理器100计算。一般情况下,通过观察导频符号流估计Nt(f)。图2示出了利用平方均值82和88以及滤波器84和86形成Nt(f)估值的方法。在示意性实施例中,滤波器84和86是简单平均滤波器并且Nt(f)根据下列方程(7)确定:
这里N为提供统计的累积样本数。在示意性实施例中,N为24。
当在方框112内计算出业务信道上噪声之后,移动站18测量所接收业务信道符号的符号能量。来自解扩展器80的PN解扩展信号被提供给Walsh解扩展器90,正如在美国专利Nos.4,901,307和5,103,459中详细描述的那样,该解扩展器根据所分配业务信道Walsh序列解扩展接收的业务信道信号。
Walsh解扩展信号随后提供给平方装置92。如上所述,在示意性的实施例中接收信号是QPSK信号,虽然本发明同样可用于其它调制技术。平方装置92平方并求和Walsh解扩展I和Q分量的幅值并将数值提供给滤波器94。滤波器94从业务信道符号能量估值中去除噪声(业务Es)并向功率控制处理器100提供滤波后的估值。
功率控制处理器100随后根据下列方程(8)将估计的业务符号能量值(业务Es)转换为估计的业务比特能量值(业务Eb)。
这里Rs是发射信号符号率而Rb是发射信号的比特率。由于移动站18不知道发射信号合适的比特率(Rb),所以在变速通信系统中该计算带来了更多的复杂性。
解决变速问题的一种可行方案是功率控制处理器100估计变速发射的比特率Rb。一种估计变速发射的可行方法是移动站18根据接收帧的统计和历史数据估计当前帧的速率。示意性实施例的方法是假定当前帧与前一帧是一致的。
正如申信工业协会暂行标准
TIA/EIA IS-95-A双模宽带扩展谱蜂窝系统移动 站-基站兼容标准所描述的那样,前向链路发射功率正比于速率变化。在第二示意性的实施例中,功率控制处理器100从接收的业务符号能量Es中估计信号速率。在改进的实施例中,功率控制处理器100采用相对导频子码能量(导频Ec)的业务符号能量(业务Es)来估计速率,由于导频能量衰减的速率与业务信道一致,所以这避免了因传播路径变化(例如衰落)引起的速率估计错误。
方框114内的功率控制处理器100计算传播路径(f)的Eb(f)/Nt(f)数值,对于其它传播路径也作这样的计算。随后在方框116内由功率控制处理器100对每个指针的数值衡量权重并求和。
在示意性的实施例中,功率控制处理器100将计算的Eb/Nt数值与阈值比较并提供单个比特信息,指示计算的Eb/Nt数值是大于还是小于阈值。
用户数据以帧为单位提供给分组器76,在示意性实施例中,正如在美国专利Nos.4,901,307和5,414,796中详细描述的那样,分组器产生并附加一组循环冗余校验(CRC)比特和一组结尾比特。分组后的用户数据被提供给卷积编码分组的编码器74。在示意性的实施例中,功率控制比特由编码器74编码并压缩入编码的分组内。在替换实施例中,功率控制比特被压缩入分组内而不经过编码。在第二替换实施例中,功率控制比特可以与分组的用户数据一起编码,但是由于在恢复功率控制数据之前先得解码整个分组,所以会带来额外的延迟,因此这可能是要避免的。此外,功率控制数据可以在信令信道或者专用功率控制信道上发射。
包含功率控制比特的编码分组随后被提供给对发射数据进行调制的调制器72。在示意性的实施例中,正如在美国专利Nos.4,901,307和5,103,459中详细描述的那样,调制器72是扩展谱调制器。调制的信号被提供给发射机(TMRT)70,该发射机上转换和放大信号并经过去多路复用器68和天线66发射信号。
发射的信号由基站12的天线50接收并且提供给接收机52。接收机52下转换和放大信号并将信号提供解调器54。在示意性的实施例中,正如在美国专利Nos.4,901,307和5,103,459中详细描述的那样,解调器54根据扩展谱格式解调接收的信号。解调的帧随后被提供给解码器56,在示意性的实施例中,该解码器将功率控制比特从业务报文中分离出来并分别解码两种报文。如上所述,解码后的业务报文被提供给PSTN或其它基站。
功率控制报文被提供给根据功率控制报文产生命令的控制处理器60。命令被提供给发射机(TMTR)62,该发射机响应控制处理器的命令调整输出信号的放大。
在替换实施例中,移动站18发送不止一个比特信息指示Eb/Nt的计算值。报文可以指示Eb/Nt的量化值。在第二替换实施例中,移动站18发射指示计算的Es/Nt到信号,使得移动站18无需估计所接收分组的速率。基站12知道发射帧的速率并能根据上述方程8确定Eb/Nt是否足够。
以上对本发明的描述足以使本领域内的技术人员利用本发明。对于他们来说无需创造性的劳动即可对本发明作出各种修改和改动,因此本发明的范围和精神由后面所附权利要求限定。
Claims (10)
1.一种用于CDMA通信系统中闭环功率控制系统的方法,所述方法用于生成功率控制命令,其特征在于包含以下步骤:
测量带内能量值;
计算非干扰能量值;
将所述非干扰能量值从所述带内能量值中减去以提供干扰噪声值;
测量接收信号的比特能量;以及
根据所述干扰噪声值和所述比特能量计算信噪比。
2.如权利要求1所述的方法,其特征在于包含将所述信噪比与预先确定阈值进行比较的步骤。
3.如权利要求1所述的方法,其特征在于计算非干扰能量值的步骤包括以下步骤:
测量导频信道能量;以及
根据导频分数标度所述导频信道能量以提供所述非干扰能量值。
4.如权利要求3所述的方法,其特征在于进一步包含从远地通信设备接收所述导频分数数值的步骤。
5.如权利要求1所述的方法,其特征在于测量所述比特能量的步骤包括以下步骤:
测量符号能量值;以及
根据数据率值标度所述符号能量值。
6.如权利要求5所述的方法,其特征在于所述测量所述比特能量的步骤包含确定所述数据率值的步骤。
7.如权利要求5所述的方法,其特征在于所述测量所述比特能量的步骤包含从远地通信设备接收所述数据率值的步骤。
8.一种用于CDMA通信系统中闭环功率控制系统的方法,所述方法用于生成功率控制命令,其特征在于包含以下步骤:
累加预先确定的整数个(N)解调信号样本;
根据所述累加样本计算所述解调信号的噪声值;
测量所述解调信号的比特能量;以及
根据所述解调信号的所述噪声值和所述解调信号的所述比特能量计算信噪比。
9.如权利要求8所述的方法,其特征在于进一步包含将至少一个附加信号与至少一个附加解调信号的信噪比组合起来的步骤。
10.如权利要求1所述的方法,其特征在于所述计算所述解调信号噪声值的步骤包括以下步骤:
对所述累加符号的符号幅值平方求和以提供求和能量值;
对所述累加符号的符号幅值求和;
平方所述符号幅值的所述求和;
将所述符号幅值的所述求和的平方除以N以提供归一化的平方值;
将所述归一化的平方值从所述求和能量值中减去并除以(N-1)以提供所述的噪声。
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US9425894B2 (en) * | 2010-10-29 | 2016-08-23 | Alcatel Lucent | In-band optical signal-to-noise ratio measurement |
US11382131B2 (en) * | 2020-05-05 | 2022-07-05 | Telefonaktiebolaget Lm Ericsson (Publ) | Data signaling for high frequency networks |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US5103459B1 (en) * | 1990-06-25 | 1999-07-06 | Qualcomm Inc | System and method for generating signal waveforms in a cdma cellular telephone system |
US5245629A (en) * | 1991-10-28 | 1993-09-14 | Motorola, Inc. | Method for compensating for capacity overload in a spread spectrum communication system |
US5396516A (en) * | 1993-02-22 | 1995-03-07 | Qualcomm Incorporated | Method and system for the dynamic modification of control paremeters in a transmitter power control system |
JP3457357B2 (ja) * | 1993-07-23 | 2003-10-14 | 株式会社日立製作所 | スペクトル拡散通信システム、送信電力制御方法、移動端末装置及び基地局 |
US5548808A (en) * | 1993-12-08 | 1996-08-20 | Motorola, Inc. | Method for performing a handoff in a communication system |
JP2904335B2 (ja) * | 1994-04-27 | 1999-06-14 | エヌ・ティ・ティ移動通信網株式会社 | 送信電力制御方法および移動局装置 |
US5603096A (en) * | 1994-07-11 | 1997-02-11 | Qualcomm Incorporated | Reverse link, closed loop power control in a code division multiple access system |
US5822318A (en) * | 1994-07-29 | 1998-10-13 | Qualcomm Incorporated | Method and apparatus for controlling power in a variable rate communication system |
US5577025A (en) * | 1995-06-30 | 1996-11-19 | Qualcomm Incorporated | Signal acquisition in a multi-user communication system using multiple walsh channels |
US5721754A (en) * | 1996-05-21 | 1998-02-24 | Motorola, Inc. | Signal quality detector and methods thereof |
-
1996
- 1996-09-27 US US08/722,763 patent/US5903554A/en not_active Expired - Lifetime
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1997
- 1997-09-23 CN CNB971981272A patent/CN1134909C/zh not_active Expired - Lifetime
- 1997-09-23 IL IL12907797A patent/IL129077A/xx not_active IP Right Cessation
- 1997-09-23 DE DE69729734T patent/DE69729734T2/de not_active Expired - Lifetime
- 1997-09-23 EA EA199900333A patent/EA001865B1/ru not_active IP Right Cessation
- 1997-09-23 ES ES97944378T patent/ES2224272T3/es not_active Expired - Lifetime
- 1997-09-23 PL PL97355802A patent/PL186150B1/pl not_active IP Right Cessation
- 1997-09-23 PL PL97332510A patent/PL186141B1/pl not_active IP Right Cessation
- 1997-09-23 BR BR9712074A patent/BR9712074A/pt not_active Application Discontinuation
- 1997-09-23 EP EP97944378A patent/EP0931387B1/en not_active Expired - Lifetime
- 1997-09-23 CN CNB03131449XA patent/CN100456663C/zh not_active Expired - Lifetime
- 1997-09-23 KR KR1019990702606A patent/KR20000048662A/ko not_active Application Discontinuation
- 1997-09-23 CA CA002265833A patent/CA2265833A1/en not_active Abandoned
- 1997-09-23 WO PCT/US1997/016977 patent/WO1998013951A2/en active IP Right Grant
- 1997-09-23 UA UA99031396A patent/UA57747C2/uk unknown
- 1997-09-23 AT AT97944378T patent/ATE270476T1/de not_active IP Right Cessation
- 1997-09-23 AU AU45887/97A patent/AU722334B2/en not_active Ceased
- 1997-09-23 JP JP54312097A patent/JP3983811B2/ja not_active Expired - Lifetime
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1999
- 1999-03-26 NO NO991497A patent/NO991497L/no not_active Application Discontinuation
-
2000
- 2000-01-20 HK HK00100374A patent/HK1021778A1/xx not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
WO1998013951A2 (en) | 1998-04-02 |
EA199900333A1 (ru) | 1999-12-29 |
CN100456663C (zh) | 2009-01-28 |
JP2001501385A (ja) | 2001-01-30 |
DE69729734T2 (de) | 2005-06-30 |
PL332510A1 (en) | 1999-09-13 |
JP2007184906A (ja) | 2007-07-19 |
CN1134909C (zh) | 2004-01-14 |
BR9712074A (pt) | 1999-08-24 |
EP0931387A2 (en) | 1999-07-28 |
US5903554A (en) | 1999-05-11 |
CA2265833A1 (en) | 1998-04-02 |
EA001865B1 (ru) | 2001-10-22 |
NO991497D0 (no) | 1999-03-26 |
ATE270476T1 (de) | 2004-07-15 |
PL186141B1 (pl) | 2003-10-31 |
UA57747C2 (uk) | 2003-07-15 |
AU4588797A (en) | 1998-04-17 |
DE69729734D1 (de) | 2004-08-05 |
NO991497L (no) | 1999-05-25 |
IL129077A (en) | 2003-09-17 |
CN1516377A (zh) | 2004-07-28 |
JP3983811B2 (ja) | 2007-09-26 |
EP0931387B1 (en) | 2004-06-30 |
KR20000048662A (ko) | 2000-07-25 |
PL186150B1 (pl) | 2003-10-31 |
HK1021778A1 (en) | 2000-06-30 |
ES2224272T3 (es) | 2005-03-01 |
JP4658910B2 (ja) | 2011-03-23 |
AU722334B2 (en) | 2000-07-27 |
IL129077A0 (en) | 2000-02-17 |
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