CN102007739A - Mimo慢预编码方法和装置 - Google Patents
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Abstract
本文公开的预编码器技术基于长期统计信道信息,以用于减少信道反馈开销和传送器复杂度。在一个实施例中,接收器(120)包括大约间隔开λ/2的两个或更多接收天线(140)和基带处理器(150)。基带处理器(150)为传送天线与每个接收天线的不同组合计算信道相关(202)并在不同接收天线上平均信道相关以形成频率无关的信道相关矩阵(204)。基带处理器(150)还计算表示在接收天线的噪声方差的标量(206),并反馈频率无关的信道相关矩阵和标量,以用于在执行传送器预编码计算中使用(208)。
Description
技术领域
本发明主要涉及预编码,更具体地来说涉及MIMO无线通信系统中的慢预编码。
背景技术
预编码是一种用于支持MIMO(多输入、多输出)无线电系统中的多层传送的技术。预编码涉及最优地集中传送天线的功率和方向以改善信号质量接收。通过将预滤波器权重与信道和噪声条件匹配能够最优地集中传送天线。以此方式,能够以独立且适合的加权从传送天线发射多个信号流,以便在接收器最大化链路吞吐量。
基于在传送器周期性接收到的信道反馈信息来确定预滤波器权重。在具有nT个传送天线和nR个接收天线的预编码的MIMO OFDM(正交频分复用)系统中,输入输出关系能够描述为:
Y(f)=G(f)W(f)S(f)+N(f),f∈[1,Nf] (1)
其中Y(f)是nR×1接收的信号矢量,G(f)是nR×nT信道响应矩阵,W(f)是nT×NS预编码矩阵,S(f)是传送的流的NS×1矢量,N(f)是基于nR×nR噪声相关矩阵Kn(f)的nR×1噪声(包括干扰)矢量,Nf表示OFDM副载波的数量以及NS表示传送的流的数量。当在传送器可获得理想信道状态信息时获得MIMO系统的最优性能,并且预编码矩阵W(f)基于如下形式的瞬时白化信道相关矩阵H(f)的特征矢量来设计:
然而,仅通过由传送器在前向链路上周期性发送的参考信号,信道响应常常对于接收器是已知。接收器观察的信道响应显式地在上行链路(即接收器到传送器)上反馈到传送器。此类信道响应反馈通常包括nT×nR×Nf个复信道系数,并且常常消耗很大的上行链路开销,对于具有大频带(即,大数量的Nf个副载波)的LTE(长期演进)OFDM系统尤其如此。而且,闭合回路MIMO系统中的信道响应反馈信息通常在快速衰落速率来改变,这要求更频繁地使用上行链路资源来以及时方式传送信道信息。
其中
KG(m1,m2,i1,i2)=E{G(f;m1,i1)G*(f;m2,i2)} (5)
是下行链路(即传送器到接收器)信道G(f;m1,i1)与G(f;m2,i2)之间的统计相关。下行链路信道G(f;m1,i1)描述从传送天线m1到接收天线i1的信号传播;下行链路信道G(f;m2,i2)类似地描述从传送天线m2到接收天线i2的信号传播。
已知的是,统计信道相关KG(m1,m2,i1,i2)与频率无关,正如等式(5)中所示。而且,等式(4)的白化信道相关矩阵并不像等式(2)的H(f)那样基于瞬时信道状态信息。因此,通常相比H(f)更稳定并且在更慢的速率变化。因此,与其瞬时的相当矩阵W(f)相比,不那么经常需要上行链路资源来反馈慢预编码矩阵
发明内容
根据本文公开的方法和装置,描述基于长期统计信道信息的预编码器技术,其减少信道反馈开销和基站的复杂度。MIMO系统的接收天线大约间隔开λ/2(其中λ是波长)。在这些条件下,接收天线之间的信道实际上变得不相关。因此,能够对传送天线中的不同一个传送天线与每个接收天线计算不同下行链路信道之间的统计相关。通过如此做,能够在不同接收天线上平均信道相关以形成频率无关的信道相关矩阵。而且,将噪声方差计算为标量而非矩阵。采用频率无关的信道相关矩阵减少了报告信道信息的频度。使用标量而非矩阵来表示噪声方差减少了信道状态反馈的量,并由此减少在传送器使用的预滤波器的数量,从而降低基站复杂度。
在一个实施例中,一种从具有大约间隔开λ/2的两个或更多天线的接收器向具有两个或更多传送天线的传送器反馈信道质量信息的方法包括为传送天线与每个接收天线的不同组合计算信道相关。在不同接收天线上平均信道相关以形成频率无关的信道相关矩阵。计算表示在接收天线的噪声方差的标量。反馈频率无关的信道相关矩阵和标量,以用于在执行传送器预编码计算中使用,例如使用预编码矩阵来确定预滤波器权重。在一个实施例中,接收器基于频率无关的信道相关矩阵和标量来计算预编码矩阵(例如,通过取相关矩阵的特征矢量)。然后将预编码矩阵发送到传送器。在另一个实施例中,接收器由频率无关的信道相关矩阵和标量来计算白化信道相关矩阵。将白化信道相关矩阵发送到传送器以用于预编码矩阵计算。在这些实施例的每一个中,基于预编码矩阵来设置传送器处的预滤波器权重。
当然,本发明并不局限于上面的特征和优点。实际上,本领域的技术人员在阅读下文详细描述并参见附图后将认识到附加特征和优点。
附图说明
图1是MIMO OFDM无线通信系统的实施例的框图。
图2是MIMO OFDM无线通信系统中用于反馈信道质量信息的程序逻辑的实施例的流程图。
图3是用于基于信道质量反馈信息来设置传送器预滤波器权重的程序逻辑的实施例的流程图。
具体实施方式
图1示出MIMO OFDM无线通信系统100的实施例,其包括服务一个或多个无线接收器120(如移动终端)的传送器110(如基站)。传送器110具有两个或更多的传送天线130,用于使用多个频率副载波在下行链路通信信道上将信号流传送到接收器120。接收器120相似地具有两个或更多的接收天线140,用于接收传送的信号流。接收器120包括基带处理器150,用于处理接收的信号流,包括信道响应估计。为此,基带处理器150包括信道相关计算器152和噪声方差计算器154以用于估计下行链路信道响应。
能够示出当接收天线140大约间隔开λ/2(即1/2波长间隔)时,天线140之间的信道实质上变得不相关。在这些接收天线分隔条件下,等式(5)能表示为:
KG(m1,m2,i1,i2)=KTX(m1,m2,i1)·δ(i1-i2) (6)
其中
KTX(m1,m2,i)=E{G(f;m1,i)G*(f;m2,i)} (7)
是下行链路信道G(f;m1,i)与G(f;m2,i)之间的统计相关。第一下行链路信道G(f;m1,i)描述从传送天线m1到第i个接收天线140的信号传播。第二下行链路信道G(f;m2,i)类似地描述从传送天线m2到同样的第i个接收天线140的信号传播。广义地来说,信道相关计算器152计算传送天线130与每个接收天线140的不同组合的信道相关KTX(m1,m2,i),例如,如图2的步骤202所示。
将等式(6)代入等式(4)得到如下给出的白化信道相关矩阵:
信道相关计算器152通过在nR个接收天线140上对信道相关KTX(m1,m2,i)取均值来计算频率无关的信道相关矩阵例如,如图2的步骤204所示。此外,噪声方差估计器154将不同接收天线140处的噪声方差视为大约相同。由此,等式(8)具有如下形式:
其中
由此,等式(9)的白化信道相关矩阵是两个项的乘积。一个项是与频率无关的并因此能够不那么经常报告的频率无关的信道相关矩阵另一个项α(f)是噪声方差标量,其对于所有传送天线130均是相同的并且能够被视为预滤波器,例如,如图2的步骤206所示。将频率无关的信道相关矩阵和噪声方差标量α(f)提供到传送器110,以用于在执行预编码计算中使用,例如,如图2的步骤208所示。
根据一个实施例,接收器120以白化信道相关矩阵的形式将这些项反馈到传送器110,白化信道相关矩阵被传送器110用在预编码矩阵计算中。在另一个实施例中,接收器120通过基于白化信道相关矩阵来计算预编码矩阵并将该预编码矩阵传送到传送器110来将这些项间接反馈到传送器110。在任何一种情况中,白化信道相关矩阵均能够由噪声方差项α(f)和频率无关的信道相关矩阵的估计来推导。
在一个实施例中,信道相关计算器152估计传送天线130与每个接收天线140的不同组合的信道相关KTX(m1,m2,i)。在多个频率副载波Nf和多个时隙Nt上对信道估计进行长期平均,如下式给出:
噪声方差计算器154类似地基于每个频率f的导频符号上的某些噪声样本来估计噪声相关Kn(f;i1,i2)。逆噪声相关的估计能够从Kn(f;i1,i2)的估计来获得。将逆噪声相关表达式代入等式(10)提供:
其中
以及Ψ是矩阵的特征矢量。当将接收天线140处的噪声视为相对空间上的不相关时,也能够获得预编码矩阵的此表达式。在这些条件下,噪声相关矩阵Kn(f)具有如下形式:
Kn(f)=diag{σ2(f;1),σ2(f;2),…,σ2(f;nR)} (15)
其中σ2(f;i)是第i个接收天线处的噪声方差。
这与等式(9)一致。因此,能够将等式(14)的预编码器表达式视为空间上不相关的噪声的最优慢预编码器。这不会导致MIMO系统100忽略接收天线140之间的真实噪声相关,因为接收器基带处理器150应付噪声相关。
能够通过在频率上对信道响应估计矩阵取均值来进一步简化等式(14)的预编码器表达式。还在频率上对频率有关的噪声方差标量α(f)取均值以获得频率无关的噪声方差标量α。在这些条件下,等式(14)的预编码矩阵简化为:
其中β选为满足传送的功率约束。
传送器110使用预编码矩阵来最优地集中传送天线130的功率和方向。通过将预滤波器权重与预编码矩阵表示的信道和噪声条件匹配来最优地集中传送天线130。在一个实施例中,使用预编码矩阵来设置传送天线130的预滤波器权重。更详细来说,传送器110包括基带处理器160。传送器基带处理器160将反馈信号解码以便重构接收器120计算的预编码矩阵备选的是,传送器基带处理器160将反馈信号解码以重构从接收器120接收的白化信道相关矩阵白化信道相关矩阵由接收器120基于噪声方差标量α(f)或α以及频率无关的信道相关矩阵来计算,例如,如图3的步骤300所示。
传送器基带处理器160中包含或与之关联的预滤波器权重计算器162基于白化信道相关矩阵来计算预编码矩阵例如,如图3的步骤302所示。在一个实施例中,传送器基带处理器160从白化信道相关矩阵推导出特征矢量Ψ,以便计算预编码矩阵(如等式(14)或等式(18)所给出的)。传送器基带处理器160然后基于预编码矩阵对到接收器120的信号传送加权,例如,如图3的步骤304所示。以此方式,能够以独立且适合的加权从传送天线130发射多个信号流,以便在接收器120最大化链路吞吐量。
当然,可设想其他变化。因此,前文描述和附图表示用于系统信息的传送的本文教导的方法和装置的非限制性示例。因此,本发明不限于前文论述和附图。相反,本发明仅由所附权利要求及其合法等效物来限定。
Claims (20)
1.一种从具有大约间隔开λ/2的两个或更多接收天线的接收器向具有两个或更多传送天线的传送器反馈信道状态信息的方法,所述方法特征在于:
为所述传送天线与每个接收天线的不同组合计算信道相关(202);
在所述不同接收天线上平均所述信道相关以形成频率无关的信道相关矩阵(204);
计算表示在所述接收天线的噪声方差的标量(206);以及
反馈所述频率无关的信道相关矩阵和所述标量,以用于在执行传送器预编码计算中使用(208)。
2.如权利要求1所述的方法,其中为所述传送天线与每个接收天线的不同组合计算信道相关特征在于:
为不同传送和接收天线组合推导信道估计;以及
在多个频率副载波和多个时隙上对所述信道估计进行长期平均。
3.如权利要求1所述的方法,特征还在于在频率上平均所述标量以使得所述标量是频率无关的。
4.如权利要求1所述的方法,其中计算所述标量特征在于为所述不同接收天线中的每个计算标量噪声方差估计。
5.如权利要求1所述的方法,其中计算所述标量特征在于由噪声相关矩阵的对角线分量形成矢量。
6.如权利要求1所述的方法,其中反馈所述频率无关的信道相关矩阵和所述标量以用于在执行传送器预编码计算中使用特征在于:
基于所述频率无关的信道相关矩阵和所述标量来计算白化信道相关矩阵;以及
将所述白化信道相关矩阵传送到所述传送器以用于在执行传送器预编码计算中使用。
7.如权利要求6所述的方法,其中基于所述频率无关的信道相关矩阵和所述标量来计算白化信道相关矩阵特征在于:
当在所述接收天线的噪声方差相对并不相同时用所述标量来缩放所述信道相关;以及
在所述不同接收天线上平均所缩放的信道相关。
8.如权利要求6所述的方法,其中基于所述频率无关的信道相关矩阵和所述标量来计算白化信道相关矩阵特征在于:
当在所述接收天线的噪声方差相对相同时在所述不同接收天线上平均所述信道相关;以及
用所述标量来缩放所平均的信道相关。
9.如权利要求1所述的方法,其中反馈所述频率无关的信道相关矩阵和所述标量以用于在执行传送器预编码计算中使用特征在于:
基于所述频率无关的信道相关矩阵和所述标量来计算预编码矩阵;以及
将所述预编码矩阵传送到所述传送器。
10.如权利要求9所述的方法,其中基于所述频率无关的信道相关矩阵和所述标量来计算预编码矩阵特征在于:
基于所述频率无关的信道相关矩阵和所述标量来计算白化信道相关矩阵;以及
由所述白化信道相关矩阵来推导特征矢量。
11.一种接收器(120),特征在于:
两个或更多接收天线(140),大约间隔开λ/2;以及
基带处理器(150),配置成:
为传送天线与每个接收天线的不同组合计算信道相关(202);
在所述不同接收天线上平均所述信道相关以形成频率无关的信道相关矩阵(204);
计算表示在所述接收天线的噪声方差的标量(206);以及
反馈所述频率无关的信道相关矩阵和所述标量,以用于在执行传送器预编码计算中使用(208)。
12.如权利要求11所述的接收器(120),其中所述基带处理器(150)配置成为不同传送和接收天线组合推导信道估计,并在多个频率副载波和多个时隙上对所述信道估计进行长期平均以计算所述信道相关。
13.如权利要求11所述的接收器(120),其中所述基带处理器(150)配置成在频率上平均所述标量以使得所述标量是频率无关的。
14.如权利要求11所述的接收器(120),其中所述基带处理器(150)配置成为所述不同接收天线中的每个计算标量噪声方差估计。
15.如权利要求11所述的接收器(120),其中所述基带处理器(150)配置成通过由噪声相关矩阵的对角线分量形成矢量来计算所述标量。
16.如权利要求11所述的接收器(120),其中所述基带处理器(150)配置成:
基于所述频率无关的信道相关矩阵和所述标量来计算白化信道相关矩阵;以及
传送所述白化信道相关矩阵,以用于在执行传送器预编码计算中使用。
17.如权利要求16所述的接收器(120),其中所述基带处理器(150)配置成:
当在所述接收天线的噪声方差相对并不相同时用所述标量来缩放所述信道相关;以及
在所述不同接收天线上平均所缩放的信道相关以计算所述白化信道相关矩阵。
18.如权利要求16所述的接收器(120),其中所述基带处理器(150)配置成:
当在所述接收天线的噪声方差相对相同时在所述不同接收天线上平均所述信道相关;以及
用所述标量来缩放所平均的信道相关以计算所述白化信道相关矩阵。
19.如权利要求11所述的接收器(120),其中所述基带处理器(150)配置成:
基于所述频率无关的信道相关矩阵和所述标量来计算预编码矩阵;以及
传送所述预编码矩阵。
20.如权利要求19所述的接收器(120),其中所述基带处理器(150)配置成:
基于所述频率无关的信道相关矩阵和所述标量来计算白化信道相关矩阵;以及
由所述白化信道相关矩阵来推导特征矢量以形成所述预编码矩阵。
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US12/105,313 US20090262843A1 (en) | 2008-04-18 | 2008-04-18 | MIMO Slow Precoding Method and Apparatus |
PCT/SE2009/050178 WO2009128767A1 (en) | 2008-04-18 | 2009-02-18 | Mimo slow precoding method and apparatus |
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EP2744141B1 (en) * | 2012-12-17 | 2017-09-06 | Mitsubishi Electric R&D Centre Europe B.V. | Method and device for allocating time and frequency resources for at least one data transmission via a fast fading frequency selective channel |
US9787374B1 (en) * | 2013-07-16 | 2017-10-10 | Vencore Labs, Inc. | Systems and methods for high-rate RF communications employing spatial multiplexing in line of sight environments |
JP6885120B2 (ja) * | 2017-03-14 | 2021-06-09 | 富士通株式会社 | 通信装置、通信システム及び通信方法 |
WO2020030848A1 (en) * | 2018-08-09 | 2020-02-13 | Nokia Technologies Oy | Exploiting receiver antenna correlation in time-compression-based csi feedback scheme |
CN113783592A (zh) * | 2021-08-27 | 2021-12-10 | 华中科技大学 | 一种用于波束偏移补偿的混合预编码方法及系统 |
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