CN1864346A - 在移动通信中应用于多输入/多输出系统的控制数据调制和编码的方法 - Google Patents
在移动通信中应用于多输入/多输出系统的控制数据调制和编码的方法 Download PDFInfo
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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Abstract
本发明公开一种在多输入/多输出(MIMO)通信系统中通信的方法。该方法包括步骤:接收对应于该MIMO系统中每个发送的数据流的信道状态信息(CSI)(S10),和基于该接收的信道状态信息(CSI),确定(S12)公共调制和/或编码方案(MCS)并将其应用(S14)于所有的该发送数据流。
Description
技术领域
本发明涉及在多输入/多输出(MIMO)系统中选择用于多个数据流的公共数据调制和编码设置(MCS)的方法。
背景技术
现行的高速下行链路分组访问(HSDPA)系统在发射天线中使用单个数据流将数据发送给用户设备(UE)。例如,参见JUHUAKORHONEN,INTRODUCTION TO 3G MOBILE COMMUNICATIONSSYSTEMS(2003年,第二版),其整个内容作为参考资料整体结合在此。在以上所述的电信系统中,基站称为节点B,并且移动终端、用户单元等等称为用户设备(UE)。
在现行的HSDPA系统中,调制和编码设置(MCS)被固定用于该单个数据流,并且数据基于固定的MCS经由发射天线发送。调制和编码设置的一个例子是QPSK调制和1/2的turbo编码。但是,不断发展的电信系统将有可能实现利用多个发射天线和多个接收天线(例如,MIMO系统)。在MIMO系统中,可以为每个发送的数据流选择单独的MCS。但是,现在还没有实现选择该MCS的标准。
发明内容
因此,本发明的一个目的是至少针对以上提到的和其它的问题。
本发明的另一个目的是规定MIMO系统中选择用于多个数据流的MCS的标准。
本发明的又一个目的是选择降低了信令负载要求的MCS。
为了实现这些目的和其他的优点,和按照本发明的目的,如在此处实施和广泛地描述的,本发明提供一种新颖的在多输入/多输出通信系统中通信的方法。该方法包括接收对应于该MIMO系统中每个发送数据流的信道状态信息,和基于该接收的信道状态信息,确定用于所有的发送数据流的公共调制方案。还可以基于接收的信道状态信息选择公共编码方案、公共调制方案或者公共调制和编码设置。
在下面的描述中将在某种程度上阐述本发明的额外的优点、目的和特点,在参阅以下内容时或者可以从本发明的实践中获悉,本发明额外的优点、目的和特点在某种程度上对于那些本领域普通的技术人员将变得显而易见。通过在著述的说明书及其权利要求以及附图中特别指出的结构,可以实现和获得本发明的目的和其他的优点。
附图说明
下面将参考以下的附图详细地描述本发明,其中相同的参考数字涉及相同的单元,其中:
图1是按照本发明不同的例子用于解释MCS选择的V-BLAST系统的发射侧的概述;
图2是该V-BLAST系统接收侧的概述;和
图3是举例说明按照本发明选择共同MCS方法的流程图。
具体实施方式
现在将参考附图描述本发明,在几个附图中相同的参考数字指定相同的或者相应的部分。
MIMO系统的一个例子在图1和2中示出,并且被称为V-BLAST(Vertical Bell Laboratories Layered Space Time,纵向贝尔实验室分层空时)系统。更详细地,MIMO无线通信系统使用多元天线阵列通过开发信道的空间性能提高在散射丰富的环境中用户容量。一个这样的系统是该V-BLAST系统,与D-BLAST系统的对角分层空时结构相对反,其使用纵向分层的空时结构。该V-BLAST系统在由P.W.Wolniansky,G.J.Foschini,G.D.Golden,和R.A.Valenzuela撰写的“V-BLAST:AnArchitecture for Realizing Very High Data Rates Over the Rich-ScatteringWireless Channel”(ISSSE′98,1998年10月),和在由相同的作者撰写的“Detection algorithm and initial laboratory results using V-BLASTspace-time communication architecture”(IEEE,Vol.35,No.1,1999年1月)中描述,引入其两者作为参考资料。
在以上所述的V-BLAST系统中,分离发送和接收的子数据流的能力取决于在不同的子数据流如何经由该环境传播方面上微小的差别。因此,该V-BLAST系统依靠经由多个发射机天线发射的分离的子流的非相关性。
更详细地,图1举例说明该V-Blast系统的发射侧,并且图2举例说明该V-Blast系统的接收侧。首先将提供对该V-Blast系统操作的描述,继之以按照本发明不同的例子选择用于该发射天线的MCS的描述。
如图1所示,该V-Blast系统的发射侧包括多路分解器2,编码、交织和映射单元4,扩展单元6,码元合成单元8,扰频单元10和发射天线12。在该MIMO系统中,可以为每个不同的数据流选择单独的MCS。现在将给出发射侧操作的例子。
例如,假设输入到该多路分解器2的数据流包括9600个比特。然后,该多路分解器2将输入的数据流分段为例如每个包括4800个比特的两个数据块(假设两个发射天线)。这两个4800个数据比特然后由编码、交织和映射单元4处理。更详细地,基于用于特定的天线的编码方案(假设1/2的turbo编码用于第一个天线121,而1/3的turbo编码用于第T个天线12T)对该4800个比特的每个进行编码。因此,在这个例子中,第一个4800个比特将被编码为9600个比特(即,1/2的turbo编码),并且第T个4800个比特将被编码为14400个比特(即,1/3的turbo编码)。然后将这两个编码的数据块存储进交织器中用于映射。假设正交振幅调制(QAM)被用于第一个天线121,而正交相移键控(QuadraturePhase Shift Keying,QPSK)被用于第T个天线12T。然后,第一个9600个编码的比特将被映射为2400个码元(即,QAM将4个比特映射为一个码元,从而9600个编码的比特将被映射为2400个码元)。第T个14400个比特将被映射为7200个码元(即,QPSK将2个比特映射为一个码元,从而14400个编码的比特将被映射为7200个码元)。然后这两个独立编码和调制的数据块由扩展单元6处理。
扩展单元6使用各种各样的扩展码,诸如OVSF(正交可变扩展因子)码扩展该数据块,以便辨别每个天线的不同信道。注意到,在图2中示出的该MIMO系统的接收侧具有相同的扩展码,并且使用相同的码解扩展接收的数据。因此,该MIMO系统能够对于每个相应的天线选择不同的MCS,从而提高该系统的吞吐量。
然后,在从相应的天线121和12T发射之前,在码元合成单元8中合成该扩展码元和在扰频单元10中对其扰频。注意到,扰频码被用于鉴别小区范围(例如,接收的信息是从节点B1,而不是例如从节点B2接收的)。
接收操作反转该发射操作,以最终获得最初发送的数据。更详细地,参考图2,接收侧包括接收天线20、干扰去除单元22、最小均方差(MMSE)检测器24、解扩展器26、多路复用器28、信号检测、去映射、去交织和解码单元30、信号重新配置单元32以及合成和多路复用单元34。
此外,该接收端的MMSE检测器24检测在经由多个接收天线(201~20N)接收的信号之中具有最大SINK(信号与干扰噪声比)的信号,并且对该信号执行MMSE均衡。MMSE检测器24的输出被在该解扩展器26中解扩展,然后合成为一个信号。信号检测单元30从多路复用器28输出的信号中检测传输码元,并且对检测的码元执行去映射和去交织操作以检测第一子流。
此时,信号重新配置单元32将由信号检测单元30检测的第一个子流重建为接收信号形式,并且将其输出到干扰去除单元22。为了将在码元之间的影响减到最小,该干扰去除单元22从先前存储在缓冲器中的接收信号中删除首次检测的信号分量(重建的信号),然后将检测了信号分量的信号输出到MMSE检测器24。
然后,该MMSE检测器24均衡在去除了重建的信号的信号之中具有最大SINR的信号。MMSE检测器24的输出经由解扩展器26和多路复用器28输入到信号检测单元30,并且该信号检测单元30检测第二子流。
信号重新配置单元32重建已经由信号检测单元30检测的第二子数据流,并且将其输出给干扰去除单元22。然后,该干扰去除单元22从先前存储在缓冲器中的信号中删除该重建的信号,并且将其输出到MMSE检测器24。
而后,通过重复执行以上所述操作,信号检测单元30顺序地检测子数据流。在所有子数据流被信号检测单元30检测之后,合成单元34将多个检测的子流组装形成一个数据流。
因此,概括地说,该V-BLAST系统使用M个发射天线和N个接收天线执行通信。在这种情况下,顺序地产生的数据实质上穿过一个串并行转换电路,经由相应的天线作为独立的信号并行发射。此外,如上所述,可以单独地对每个天线设置发送的信号的调制和编码方案(MCS)。
此外,单独地选择该MCS提高了MIMO系统的吞吐量。但是,该接收侧必须发送信令信道信息给发射侧(诸如,表示信道质量的信道质量指示符(CQI))。例如,如果分别控制四个天线的MCS,与使用单个码的单个天线相比较,存在四倍的信道状态信息(诸如CQI)。因此,一个额外的信令负荷被增加给该MIMO系统。
因此,尽管能够对每个天线分别选择不同的MCS,但是本发明对每个天线设置相同的MCS。更详细地,在从接收侧接收信道状态信息(以下简称为CQI)时,发射侧基于接收的CQI信息选择适当的MCS。
也就是说,如图3所示,接收对应于MIMO系统中每个数据流的CQI(步骤S10),基于接收的CQI来选择适当的MCS(步骤S12),将选择的MCS应用到该MIMO系统中所有的发送数据流(步骤S14),并且天线使用同样应用的MCS来发射数据(步骤S16)。
例如,假设存在四个发射天线,那么对于发送数据流的每个将有来自接收侧的四个独立的CQI。因此,按照本发明,发射侧基于接收的CQI选择适当的MCS。在一个例子中,发射侧选择允许发送最大量数据的MCS,并且将选择的MCS应用到在这个例子中的四个数据流的每个。例如,如果用于四个发射天线的CQI分别地是3比特/秒、2比特/秒、0.5比特/秒和1比特/秒,发射侧将产生3比特/秒的CQI所使用的MCS应用到所有的四个天线(即,在这个例子中,第一个天线产生3比特/秒的CQI),因而,用于第一个天线的该MCS将应用于所有的四个天线。
但是,注意到本发明还可以选择这样的MCS,其产生最小的CQI、接收的CQI的平均值、平均的CQI或者任何其他的组合。例如,以上CQI的平均值是1.65比特/秒。在这个例子中,选择产生这个平均值的该MCS,并且将其应用于所有的天线。这可以例如通过读取CQI数据表并且检索产生提到的1.65比特/秒的CQI的相应MCS来执行。此外,如果该CQI表不包括计算的准确的CQI(诸如,在这个例子中,1.65比特/秒的CQI),可以选择最接近1.65比特/秒的CQI的MCS。
概括地说,本发明将相同的MCS应用于所有的数据流,从而减少了从接收侧发送的信令开销,并且还使得能够将更多的功率分配给数据传输,以便提高传输效率。
注意到,以上所述的例子描述了选择由每个发射天线使用的共同MCS。但是,也可以仅选择单个调制方案(而不是选择MCS中调制和编码方案两者),或者仅选择单个编码方案(而不是选择MCS中调制和编码方案两者)来应用于每个发射天线。
使用常规的通用数字计算机或者按照本说明书的教导编程的微处理器可以方便地实现本发明,这对于计算机领域的技术人员来说是显而易见的。基于本公开的教导,可以容易地由熟练的程序员制备适当的软件编码,这对于软件领域的技术人员来说是显而易见的。还可以通过制备专用集成电路或者通过相互连接适当的常规组件电路的网络来实现本发明,这对于本领域技术人员来说是显而易见的。
本发明包括计算机程序产品,其是包括可用于编程计算机以执行本发明处理过程的指令的存储介质。该存储介质可以包括,但是不局限于,任何类型的盘,包括软盘、光盘、CD-ROM和磁光盘,ROM、RAM、EPROM、EEPROM、磁卡或者光学卡,或者适用于存储电子指令的任何类型的介质。
上述的实施例和优点仅仅是示范性的,并且不应理解为限制本发明。本教导可以容易地应用于其他类型的装置。本发明的说明意图是说明性的,而不是限制权利要求的范围。对于本领域技术人员来说,许多的替换、修改和变化将是显而易见的。在权利要求中,装置加功能条款意图是覆盖在此处描述的作为执行所列功能的结构,并且不仅是结构上的等效,而且是等效的结构。
工业实用性
本发明可以应用于多输入/多输出(MIMO)系统。
Claims (24)
1.一种在多输入/多输出(MIMO)通信系统中通信的方法,包括:
接收对应于该MIMO系统中每个发送数据流的信道状态信息;和
基于接收的信道状态信息,确定用于所有的发送数据流的公共调制方案。
2.根据权利要求1的方法,进一步包括:
使用该确定的公共调制方案,调制要由每个发送数据流发送的数据,然后发送该调制的数据。
3.根据权利要求1的方法,其中确定该公共调制方案选择由相应的发送数据流使用的调制方案,其具有最佳信道状态信息。
4.根据权利要求1的方法,其中确定该公共调制方案选择由相应的发送数据流使用的调制方案,其具有最坏信道状态信息。
5.根据权利要求1的方法,其中确定该公共调制方案计算接收的来自每个发送数据流的信道状态信息的平均值,并且选择其产生该计算的平均值的调制方案,以用作该公共调制方案。
6.根据权利要求1的方法,其中确定该公共调制方案计算该接收的来自每个发送数据流的信道状态信息的均值,并且选择其产生计算的均值的调制,以用作该公共调制方案。
7.一种在多输入/多输出(MIMO)通信系统中通信的方法,包括:
接收对应于该MIMO系统中每个发送数据流的信道状态信息;和
基于接收的信道状态信息,确定用于所有的发送数据流的公共编码方案。
8.根据权利要求7的方法,进一步包括:
使用该确定的公共编码方案,编码要由每个发送数据流发送的数据,然后发送该编码的数据。
9.根据权利要求7的方法,其中确定该公共编码方案选择由相应的发送数据流使用的编码方案,其具有最佳信道状态信息。
10.根据权利要求7的方法,其中确定该公共编码方案选择由相应的发送数据流使用的编码方案,其具有最坏信道状态信息。
11.根据权利要求7的方法,其中确定该公共编码方案计算接收的来自每个发送数据流的信道状态信息的平均值,并且选择其产生该计算的平均值的编码方案,以用作该公共编码方案。
12.根据权利要求7的方法,其中确定该公共编码方案计算接收的来自每个发送数据流的信道状态信息的均值,并且选择其产生该计算的均值的编码方案,以用作该公共编码方案。
13.一种在多输入/多输出(MIMO)通信系统中通信的方法,包括:
接收对应于该MIMO系统中每个发送数据流的信道状态信息;和
基于该接收的信道状态信息,确定用于所有的发送数据流的公共调制和编码设置。
14.根据权利要求13的方法,进一步包括:
使用该确定的公共调制和编码设置,调制和编码要由每个发送数据流发送的数据,然后发送该调制和编码的数据。
15.根据权利要求13的方法,其中确定该公共调制和编码设置选择由相应的发送数据流使用的调制和编码设置,其具有最佳信道状态信息。
16.根据权利要求13的方法,其中确定该公共调制和编码设置选择由相应的发送数据流使用的调制和编码设置,其具有最坏信道状态信息。
17.根据权利要求13的方法,其中确定该公共调制和编码设置计算接收的来自每个发送数据流的信道状态信息的平均值,并且选择其产生该计算的平均值的调制和编码设置,以用作该公共调制和编码设置。
18.根据权利要求13的方法,其中确定该公共调制和编码设置计算接收的来自每个发送数据流的信道状态信息的均值,并且选择其产生该计算的平均值的调制和编码设置,以用作该公共调制和编码设置。
19.一种多输入/多输出(MIMO)通信设备,包括:
接收单元,其配置来接收对应于多个发送数据流的每个的信道状态信息;和
确定单元,其配置以基于接收的信道状态信息确定1)公共调制方案、2)公共编码方案、或者3)公共调制和编码设置中的一个,以用于所有的多个发送数据流。
20.根据权利要求19的设备,进一步包括:
调制器,其配置来使用该确定的公共调制方案来调制要由每个发送数据流发送的数据;和
编码单元,其配置来使用该确定的公共编码方案来编码要由每个发射天线发送的数据。
21.根据权利要求19的装置,其中该确定单元通过选择由相应的有最佳信道状态信息的发送数据流使用的调制方案、编码方案或者调制和编码设置,来确定该公共调制方案、编码方案,或者调制和编码设置。
22.根据权利要求19的装置,其中该确定单元通过选择由相应的具有最坏信道状态信息的发送数据流使用的调制方案、编码方案或者调制和编码设置,来确定该公共调制方案、编码方案或者调制和编码设置。
23.根据权利要求19的装置,其中该确定单元通过计算接收的来自每个发送数据流的信道状态信息的平均值,确定该公共调制方案、编码方案或者调制和编码设置,并且选择其产生该计算的平均值的调制方案、编码方案或者调制和编码设置,以用作该公共调制方案、公共编码方案或者公共调制和编码设置。
24.根据权利要求19的装置,其中该确定单元通过计算接收的来自每个发送数据流的信道状态信息的均值,确定该公共调制方案、编码方案或者调制和编码设置,并且选择其产生该计算的均值的调制方案、编码方案或者调制和编码设置,以用作该公共调制方案、公共编码方案或者公共调制和编码设置。
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Also Published As
Publication number | Publication date |
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US7502419B2 (en) | 2009-03-10 |
KR20050032277A (ko) | 2005-04-07 |
EP1668792A1 (en) | 2006-06-14 |
US20050074072A1 (en) | 2005-04-07 |
EP1668792B1 (en) | 2015-06-03 |
KR100976489B1 (ko) | 2010-08-18 |
WO2005032000A1 (en) | 2005-04-07 |
CN1864346B (zh) | 2010-06-16 |
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