CN102655430A - 通过信道传送信号的方法和无线电通信装置 - Google Patents

通过信道传送信号的方法和无线电通信装置 Download PDF

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CN102655430A
CN102655430A CN2012101529278A CN201210152927A CN102655430A CN 102655430 A CN102655430 A CN 102655430A CN 2012101529278 A CN2012101529278 A CN 2012101529278A CN 201210152927 A CN201210152927 A CN 201210152927A CN 102655430 A CN102655430 A CN 102655430A
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强德拉·法得雅纳珊
葛里·L·苏格而
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0426Power distribution
    • H04B7/0434Power distribution using multiple eigenmodes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413MIMO systems
    • H04B7/0456Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0465Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing

Abstract

一种通过具有N个天线的第一装置和具有M个天线的第二装置之间的信道传送信号的方法和无线电通信装置。在所述的第一装置,代表将发射的L个信号的一向量s是经过一发射矩阵A的处理,进而最大化在第一装置与第二装置之间受制于一功率限制的信道容量,其中,经由N个天线的每一天线所发射的功率小于或等于一最大的功率值。每个天线的功率限制可以是所有天线相同,或者是每个天线特定的或不同。例如,每个天线的功率限制可以等于由所有N个天线组合发射的总最大功率除以N。发射矩阵A在N个天线中分配L个信号以同步发射至第二装置。在所述的第二装置,由M个天线所接收的信号经由接收权重处理,并且所得到的信号被组合来恢复所述的L个信号。

Description

通过信道传送信号的方法和无线电通信装置
本申请是申请号为03823232.4、申请日为2003年7月25日、名称为“多输入多输出无线通信的装置及方法”的中国发明专利申请的分案申请。
技术领域
本发明涉及通过具有N个天线的第一装置和具有M个天线的第二装置之间的信道传送信号的方法和无线电通信装置。
背景技术
本发明针对一种最大化在两个无线电通信装置之间的一无线电通信链路的容量和/或范围的系统与方法。
多输入多输出(MIMO)无线电通信技术已熟知是用来提升由一装置到另一装置所发射的信号的接收的SNR,在MIMO无线电算法的研究已经导入多重信号流同时从一装置的多个天线上发射到另一个装置,因此大幅地提升在两个装置间的无线电通信信道的数据率。传统的借由多个天线同步地发射多个信号流的一个方法是利用在经由多个天线组合所发射的总功率上的一功率限制以及一注水解法(waterfilling solution),所谓的注水解法在发射装置上需要多个全功率的功率放大器,因为对于某些信道,所有的或几乎全部的发射功率都由一功率放大器所发射是可能的。对于MIMO系统来说,还有空间来改善用于MIMO无线电通信系统的装置的设计,尤其是,在想要在一集成电路上制造无线电收发信机装置的情况时。
发明内容
简单来说,本发明提供用于具有N个天线的一第一装置与具有M个天线的第二装置间的多重信号(信号流)的同步无线电通信的一系统、方法与装置。不像先前技术中的方法,本发明中所提供的方法在发射装置的每一发射天线路径上加入了一功率限制。
根据本发明一方面提供一种用于在具有N个天线的一第一装置与具有M个天线的一第二装置间的无线电通信的方法,所述的方法包含:通过计算一个发射矩阵A以该一个发射矩阵A来处理代表L个信号的向量s,以便使得在所述第一装置与所述第二装置间受制于一功率限制的信道容量得以最大,其中,由所述N个天线中的各天线所发出的功率小于或等于一最大功率,并且,该发射矩阵A顺着该N个天线以及该第二装置的M个天线之间的信道的特征向量加权同步发射的L个信号[sl...sL];借此,当N≤M时,所述的发射矩阵A=VD,其中V为HHH的特征向量,H为从所述的第一装置到所述的第二装置的信道响应,矩阵D=I·sqrt(Pmax/N),而I为单位矩阵,因此由N个天线的每一天线所发射的功率彼此相同且等于Pmax/N,其中Pmax是来自所有N个天线组合的总发射功率。
根据本发明另一方面提供一种无线电通信装置,其包含:a.N个天线;b.N个无线电发射机,每一发射机连接到多个天线中对应的一个;C.一基带信号处理器,连接到所述的N个无线电发射机,通过计算一个发射矩阵A以该一个发射矩阵A来处理代表L个信号的向量s,以便使得在所述装置与一远端装置间受制于一功率限制的信道容量得以最大,其中,由所述N个天线中的各天线所发出的功率小于或等于一最大功率,并且,该发射矩阵A顺着该N个天线以及该远端装置的M个天线之间的信道的特征向量加权同步发射的L个信号[sl...sL];借此,当N≤M时,所述的发射矩阵A=VD,其中V为HHH的特征向量,H为从所述的装置到所述的远端装置的信道响应,矩阵D=I·sqrt(Pmax/N),而I为单位矩阵,因此由N个天线的每一天线所发射的功率彼此相同且等于Pmax/N,其中Pmax是从所有N个天线组合的总发射功率。
根据本发明又一方面提供一种无线电通信系统,其包含:a.一第一装置;i.N个天线;ii.N个无线电发射机,每一发射机连接到多个天线中对应的一个;以及iii.一基带信号处理器,连接到所述的N个无线电发射机,通过计算一个发射矩阵A以该一个发射矩阵A来处理代表L个信号的向量s,以便使得在所述第一装置与一第二装置间受制于一功率限制的信道容量得以最大,其中,由所述N个天线中的各天线所发出的功率小于或等于一最大功率,并且,该发射矩阵A顺着该N个天线以及该第二装置的M个天线之间的信道的特征向量加权同步发射的L个信号[sl...sL];借此,当N≤M时,所述的发射矩阵A=VD,其中V为HHH的特征向量,H为从所述的第一装置到所述的第二装置的信道响应,矩阵D=I·sqrt(Pmax/N),而I为单位矩阵,因此由N个天线的每一天线所发射的功率彼此相同且等于Pmax/N,其中Pmax是从所有N个天线组合的总发射功率;b.第二装置,其包含:i.M个天线;ii.M个无线电发射机,每一发射机连接到多个天线中对应的一个;以及iii.一基带信号处理器,连接到所达的N个无线电发射机,以借由接收权重处理在经由多个无线电接收机的所输出的信号并结合所得到的结果信号以回复所述的L个信号[sl...sL]。
在第一装置上,代表所要发射的L组信号[sl...sL]的一向量s通过一发射矩阵A来处理,以最大化在所述的第一装置与第二装置间的信道的容量,其中所述的信道受制于一功率限制,亦即经由N组信道中的每一信道所发射的功率小于或等于一最大功率。对每一天线的功率限制可以与所有的天线或特定的天线相同,亦或者是不同的功率限制。例如,所述的每一天线的功率限制可能与由N组天线所发射的一功率总和除以N后的值相同。所述的发射矩阵A在N组天线中分配所述的L组信号[sl...sL]以同步发射到第二装置。而在所述第二装置,由M组天线所接收的信号以接收权重来加以处理,而所得到的信号被组合以恢复所述的L组信号。这个方式适用于N>M以及N≤M的情况。
根据本发明又一方面提供一种通过具有N个天线的第一装置和具有M个天线的第二装置之间的信道传送信号的方法,该方法包括:通过计算一个发射矩阵A来用发射矩阵A处理表示L个信号[sl...sL]的向量s,以最大化第一装置和第二装置之间的信道容量,其中发射矩阵A加权L个信号并在N个天线中分配L个信号[sl...sL]以以功率Pmax/N同步发射至第二装置,其中Pmax为来自所有N个天线组合的总发射功率。
根据本发明又一方面提供N个天线;N个无线电发射机,每个无线电发射机连接至多个天线中对应的一者;以及基带信号处理器,连接至N个无线电发生器,通过计算一个发射矩阵A来用发射矩阵A处理表示L个信号[sl...sL]的向量s,以最大化无线电装置和远程装置之间的信道容量,其中发射矩阵A加权L个信号并在N个天线中分配L个信号[sl...sL]以以功率Pmax/N同步发射至远程装置,其中Pmax为来自所有N个天线组合的总发射功率。
如果在一个系统中的通信装置是设计成大约在每一天线的功率限制,那么所述的通信系统的性能将会是接近最佳的注水解法一样的优异,而且提供更显著的实施优势。所述的无线电发射机可以以需要低功率输出容量的功率放大器来执行。因而也可以减少所需要的硅晶片的面积。因此,经由所述的发射机所泄漏的DC电流将会比较低,而且经由功率放大器所引起的芯片上的干扰也会变得比较低。
前面所说的技术特征以及本发明的目的及其它优势将会参考下列的详细说明以及配合附图而变的更加清楚。
附图说明
图1表示两个多天线的无线电通信装置所组成的一系统图,其中多重信号流经由一第一装置而同步发射到一第二装置。
图2是表示映射与多路复用信号至多个天线路径以用于同步发射的流程图。
图3表示能够执行如图1所示的MIMO无线电通信技术的一无线电通信装置的框图。
图4表示形成如图3所述的装置的一部份的一调制解调制器(modem)的发射机部分的一较佳具体实施例的框图。
图5表示所述的调制解调制器(modem)的接收机部分的一较佳具体实施例的框图。
图6是示出了根据本发明所述的MIMO无线电技术的相对性能的一坐标标绘图。
具体实施方式
请参照图1与图2所示,图中所示的一系统10中,其中具有N组天线110(1)到110(N)的一第一无线电通信装置100借由一无线电通信链路与具有M天线210(1)到210(M)的一第二无线电通信装置200进行通信。在下面的详细说明中,将只说明由所述的第一无线电通信装置发射到所述的第二无线电通信装置的状况,但相同的分析结果应用于由第二无线电通信装置到第一无线电通信装置的发射。从所述的第一通信装置的N个天线到所述的第二通信装置的M个天线的多输入多输出(MIMO)信道响应将由信道响应矩阵H来加以说明。所述的信道矩阵在相反的方向上即为HT
装置100将会经由天线110(1)到110(N)同步发射L个信号Sl,S2,...,SL。一向量s将由表示在基带上发射的L个信号[S1...SL]来定义,以使得s=[S1...SL]T。所述的可以同步发射的信号的数目(L)与在所述的装置100与装置200间的信道H有关,尤其是L≤Rank of HHH≤min(N,M)。例如,假如N=4,以及M=2,那么L≤Rank of HHH≤2。
所述的装置100具有信道状态(例如使用训练序列,反馈等)的知识,也就是说装置100知道H。在发射装置(在发射装置与接收装置间)上获得与更新所述的信道知识的技术已经为本技术领域所熟知,因而不再于此详述。例如,训练与反馈技术已详述于Raleigh等人的美国专利号6,144,711。
接下来要介绍两个矩阵;V为HHH的特征向量矩阵,而A为HHH的特征值矩阵。装置100发射乘积As,其中矩阵A为空间多路复用发射矩阵,而A=VD。所述的矩阵D=diag(d1,...,dL),其中|dp|2为在pth模式下的发射功率,或者换句话说,为所述的L个信号的第Pth个的功率。装置200接收HAs+n,而且在针对每一个模式的最大比例组合之后,装置200计算c=AHHHHAs+AHHHn=DHDAs+DHVHHHn。
如图2所示,在所述的第一装置中,来自一比特流{b}的大量的比特以一映射技术而映射到一向量s。所述的映射技术可以选择性地包括编码调制以改善链路余量。所述的比特流{b}可以是一个文件或比特的集合,以表示任何形式的数据,例如语音、影像,声音,计算数据等,被划分或者分离成将在空间上多路复用或同步发射的不连续的的帧或块(通常被称为信号)。其中一个例子为多个IEEE 802.11x帧(每一Si可能为一不同的帧)从所述的第一装置100到所述的第二装置200的同步发射,其中,例如,所述的第一装置100为一IEEE 802.11接入点(AP),而所述的第二装置为客户端(STA)。所述的发射矩阵A与矩阵s的乘积为一向量x。所述的矩阵乘法步骤有效地加权向量s的每一个跨过N个天线的每一个的元素,借此,在多个天线中分配多个信号以同步发射。从矩阵乘法区块中所导出的向量x的分量x1到xN随后连接到所述的第一通信装置的对应天线。例如,元素x1为天线l的向量s的所有加权元素的总和,分量x2为天线2的向量s所有的加权元素的总和,依此类推。
发射矩阵A为包含发射权重WT,ij的一复数矩阵,其中i=1到L,而j=1到N,每一天线权重可能与频率有关以考虑一频率相关的信道H。例如,对于一多载波调制系统,例如,一正交频分复用(OFDM)系统,对每一个次载波频率k具有一个矩阵A,换句话说,每一发射权重WT,ij为次载波频率k的一个函数。对于一时域(单载波)调制系统来说,每一发射权重WT,ij可能为一抽头延迟线滤波器(tapped-delay line filter)。
于先前技术中关于选择权重dp以将容量最大化的方法
C = Σ p = 1 L log ( 1 + SNR p ) , SNR p = | d p | 2 λ p E ( | s p | 2 ) E ( | n p | 2 )
受制于由组合成发射矩阵A的多个发射天线所发射的一总功率限制,也就是说,
PTOT=Tr(AAH)·E|sp|2=Tr(VDDHVH)·E|sp|2
=Tr(VDDHVH)<Pmax(assuming E|sp|2=1)
对于这个问题的最佳解决方案在于使用注水(waterfilling)来选择所述的权重dp(也就是说,使用注水以在特征信道上施加更多的功率以具有更高的SNRλp)。
所述的注水解法在所述的发射装置上需要N个可承受全功率的功率放大器,因为,对于某些信道来说,对于最佳的方法需要将所有或者是几乎所有的功率从一天线路径上发射出去是可能的。为了重申,先前技术中的方法限制从所有的天线路径组合所发射的总功率,仅仅是∑pi=PTOT<Pmax(对i=l到N个天线),其中Pmax为总功率限制,而Pi则是为来自所发射天线路径i的功率。
一个较好的方法在于对每一个单独的发射天线路径使用功率限制。这样一个限制即为从每一天线所发射的功率小于从所有N个天线组合所发射的功率Pmax除以N,例如对每一个i来说,Pi≤Pmax/N。使用这样的方法,被称为“天线功率限制”方法,每一个功率放大器可以设计成输出(不超过)Pmax/N的平均功率,其中Pmax为来自所有的N个天线组合中所发射的最大功率。这个方法的重要的好处在于所述的功率放大器可以设计成具有低最大输出功率容量,因此只需要较少的硅芯片面积。较小与较低输出的功率放大器的使用具有较低的片上功率放大器干扰与较低的DC漏电流的好处。
当为每一个天线使用一Pmax/N功率限制,所述的问题将变成:
最大化容量C受制于(AAHii<Pmax/N,i=1,...,N。
对于dp来说,这是很难解决的问题,因为它与在使用N个拉格朗日乘子的一非线性函数中找出根有关(一个针对上述的N个限制中的每个)。然而,存在针对两个情况中的每个的简单非最佳解决方案。
状况1:N≤M:
在这个状况中,所述的发射装置(具有N个天线)将代表所要发射的L个信号[sl...sL]T乘上所述的发射矩阵A,(即计算As),其中所述的发射矩阵A以D设定成与I·sqrt(Pmax/N)(其中I为单位矩阵)相等来计算以在每一个模式下实施等效功率。因此,HHH为厄密共轭而且(在机率为1的情况下)为满秩(full-rank),即表示V是正交的。因此,(AAHii=(VDDHVHii=(VVHiiPmax/N=Pmax/N,即表示等效功率Pmax/N经由在装置100的一对应功率放大器的每一天线所发射,而且总发射功率与Pmax相等。
状况2:N>M:
在这个状况中,HHH不是满秩(full-rank)。使V1,...,VL表示具有非零特征值的HHH的L个特征向量。让V=[v1...vL]且使D=sqrt(d·Pmax/N)·I,其中每一模式下的功率都是相等的,而且对于p=l到L,dp=d。在天线路径i上的功率由公式(d·Pmax/N)·(VVHii给定。因此,从i个天线路径的每一个所发射的功率可能会不同。所述的发射装置(具有N个天线〉将代表所要发射的L个信号[sl...sL]T乘上发射矩阵A(即计算As),其中所述的发射矩阵A以D设定成与sqrt(d·Pmax/N)·I来计算,而其中所述的功率在每一个模式下都是相同的,且dp=d,其中p=l到L。
方法1:设定d=1/z,其中
Figure BDA00001646711300091
然后来自任何天线路径的最大功率都为Pmax/N。来自所有天线路径的总功率可以证明至少为Pmax/M而且不会大于Pmax
方法2:设定d=1。在这个情况中,所述的由N个天线所发射的总功率为Pmax/M而由天线i(i=1到N)所发射的功率则为Pmax/N·(VVHii
假设在链路的两端的装置上的功率放大器具有相同的峰值输出功率,则对于状况l与状况2/方法2来说,从N个天线装置发射的总功率将会与从M个天线装置所发射的总功率相等。因此,在两个装置间的链路在这些情况中是对称的。状况2/方法1仅仅稍微复杂一点(因为它需要一标准化的步骤),但相较于方法2具有更大的发射功率。
前面所述的方法对于每一个对称系统(在两端的链路上具有相同的天线数)能够执行在1dB内的香农极限(Shannon limit),但有助于在无线电收发信机中更小且更有效率的功率放大器的使用,因此,相较于注水解法,可以实现无线电路径间的较低的片上干扰(由功率放大器所引起)。
对于每一个发射天线来说,所述的天线功率限制并不需要相同,而且可以针对每个天线是特定的或不同的。此外,即使针对每一个天线使用不同的天线功率限制,每一特定天线功率限制可能会低于或等于Pmax/N。
所述的具有M个天线的装置200发射到装置100时将在M个天线上的每一个天线上受制于相同类型的功率限制。如上所述的情况应用于M相对于N的比较,而适当的解决方案用于发射信号到装置100。
图3表示适用于装置100与200的一无线电通信装置的框图。所述的装置100包含一调制解调器120、多个数字模拟转换器(DAC)130、多个模拟数字转换器140(ADC)、连接于天线110(1)到110(N)的一MIMO无线电收发信机150,以及一控制处理器160。所述的调制解调器120,也被称为基带信号处理器,且用以执行将被发射的信号(向量s)的基带调制以及所接收的信号的基带解调制。借由这样的执行,所述的调制解调器120将代表将被发射的L个信号[sl...sL]T的向量s乘上发射矩阵A。所述的DAC 130为复合DAC,用以将代表As的数字基带调制信号转换成所对应的模拟信号,而所述的DAC 130连接到MIMO无线电收发信机150中的发射路径。所述的ADC 140将来自在所述的MIMO无线电收发信机150中的所对应的接收路径上所接收的模拟信号转换成数字信号以由所述的调制解调器120基带解调制。在基带解调制过程中,所述的调制解调器120将会应用适当的接收权重到所接收的信号以恢复所述的L个信号[sl...sL]T。所述的MIMO无线电收发信机150包含多个无线电收发信机,每一个包含通过对应的开关156(i)与对应的天线连接且相关联的一发射机152(i)与一接收机154(i)。每一发射机包含一功率放大器(没有表示于图中)。所述的MIMO无线电收发信机150可以是一单一集成电路或两个或多个分离的集成电路。一单一的集成MIMO无线电收发信机的具体实施例已揭示于共同发表的美国专利申请号10/065,388(2002年10月11日提交),该案同样列为本发明的参考资料。
有很多方式可以用来执行所述的调制解调器120。图4与图5分别表示用于一多载波(例如正交频分复用(OFDM)应用)的调制解调器120的发射机部分120A与接收机部分120B的框图。一般来说,如上所述的类型的矩阵乘法是单独地执行于每一个OFDM次载波上以最佳化内部的频率选择性衰落信道(frequency-selective fading channels)的性能。请参照图4所示,所述的调制解调器的发射机部分120A包含一扰频器模块310、一卷积编码器模块315、交织器模块320、执行与发射矩阵A(在OFDM次载波k的每一个处不同)(即A=A(k))的矩阵乘法的一空间多路复用器模块325、一次载波调制器330、一快速傅立叶逆转换(IFFT)模块335以及一低通滤波器模块340。所述的低通滤波器模块340的输出连接到所述的DAC 130(图3)。一前导序列发生器(preamble generator)350也被提供并连接到所述的DAC 130。如同图4所示,假设所述的调制解调器在N个天线的装置中,存在模块315、320与325的L个示例用以执行在每一基带发射信号流上的处理以及模块335、340与130的N个示例用以处理与每一发射天线路径相关联的信号。
如图5所示的接收机部分120B包含重新取样器模块415,低通滤波器模块420、数值控制振荡器(NCO)模块425、FFT模块430、均衡器模块435,在该均衡器中,所述的接收权重应用到所接收的信号上、一解交织器模块440以及一卷积译码器模块445。一前导序列处理与自动增益控制(AGC)模块450以及一信道估计器模块455也被提供用于信道估计的计算以及其它的功能。所述的前导序列与AGC模块450恢复一在所接收信号上的一前导序列,而所述的信道估计器445产生关于所述的信道H的知识,其中所述的知识提供到所述的均衡器435以计算并应用接收权重至由所述的FFT模块430输出的信号。假设所述的调制解调器在一N个天线的装置中,存在模块415、420、425与430的N个示例用以执行在每一所接收信号流上的处理以及模块435、440与445的L个示例,用以恢复所述的L个信号。
从上面图4与图5的说明所建议的可知,一旦通过每个天线在例如一分组序列中发射一已知的OFDM训练序列,一第一装置就传递信道响应信息到一第二装置。对于一频域实现来说,所述的第二装置执行给出这个信道信息的一空间频率分解(space frequency decomposition,SFD),并且使用这个SFD数据来处理来自该装置的接收信号,并且发射信号回到其它装置。这在链路上假设了相互作用,而因此在每一装置上的MIMO相位校正必须要执行。关于MIMO相位校正的信息已经揭示于共同指定与申请的美国专利申请号10/457,293(2003年6月9日提交),该申请案已经列入本发明的参考资料中。有关以次载波指数为函数的星座顺序的信息以及特征信道也可以包含于前导序列中。每一个次载波具有针对每个特征信道的相关联的星座顺序。在发射机部分120A中,一多维向量网格编码器(VTE)可能用来映射来自扰频器的输入比特到OFDM星座符号上。多维的VTE’s的实施例已公知于相关的先前技术中。取得信道状态信息的其它技术也已为本领域所熟知,而且也已详述如前。
一调制解调器可以被构建成将前面所描述的功率限制原则应用到一时域系统实现,其中抽头延迟线滤波器会被使用。
图6示出了相较于最佳化的注水解法这里所描述的天线功率限制是更高效的。
综合以上所述,本发明提供一种用于在具有N个天线的一第一装置与具有M个天线的第二装置间的MIMO无线电通信的系统与方法。在所述的第一装置中,代表所发射信号的L个信号[sl...sL]的一向量s经过一发射矩阵A的处理而最佳化在第一装置与第二装置间受制于一功率限制的信道的容量,所述的功率限制为经由N个天线的每一天线所发射的功率小于一最大的功率。借由这样的方式,所述的发射矩阵A在N个天线中分配L个信号[sl...sL]以同步发射到所述的第二装置。同样地,所提供的一无线电通信装置包含N个天线,N个无线电发射机,每一个连接到一对应的多个天线的其中之一,而且一基带信号处理器连接到所述的无线电发射机的N个天线,并以一发射矩阵A来处理代表所发射信号的L个信号[sl...sL]的一向量s,以最大化在所述的第一装置与第二装置间受制于一功率限制的信道的容量,所述的功率限制为经由N个天线的每一天线所发射的功率小于一最大的功率值。借由这样的方式,发射矩阵A通过N个天线分配所述的L个信号[sl...sL]以同步发射到所述的第二装置。所述的发射矩阵A被计算受制于与N个天线中的一个或多个天线不同或者是与N个天线中的每一个相同的功率限制。例如,在后面的情况中,所述的发射矩阵A可能会被计算受制于与N个天线的每一个的功率限制,该功率限制等于由所有的N个天线组合所发射的一总最大功率除以N。
前面所述的说明仅作为本发明的实施例。

Claims (16)

1.一种通过具有N个天线的第一装置和具有M个天线的第二装置之间的信道传送信号的方法,该方法包括:
通过计算一个发射矩阵A来用所述发射矩阵A处理表示L个信号[s1...sL]的向量s,以最大化所述第一装置和所述第二装置之间的信道容量,其中所述发射矩阵A加权所述L个信号并在所述N个天线中分配所述L个信号[s1...sL]以以功率Pmax/N同步发射至所述第二装置,其中Pmax为来自所有N个天线组合的总发射功率。
2.根据权利要求1所述的方法,其中,在N≤M的条件下,所述发射矩阵A=VD,其中V为HHH的特征向量,H为从所述第一装置到所述第二装置的信道响应,矩阵D=I·sqrt(Pmax/N),以及I为单位矩阵。
3.根据权利要求1所述的方法,其中,在N>M的条件下,所述N个天线中的至少两个天线发射的功率彼此不相同。
4.根据权利要求1所述的方法,其中,所述发射矩阵A等于VD,其中V为HHH的特征向量,H为从所述第一装置到所述第二装置的信道响应,D=diag(d1,...,dL),以及|dp|2为所述发射功率,其中p=1至L。
5.根据权利要求4所述的方法,其中,当N>M时,D=sqrt(d·Pmax/N)·I,其中天线i发射的功率为(d·Pmax/N)·(VVHii,i=1,...,N,以及d=dp,其中p=1至L。
6.根据权利要求5所述的方法,其中,d=1/z,以及
Figure FDA00001646711200011
由此来自所述N个天线中的任意天线的最大功率为Pmax/N,而由所述N个天线组合发射的总功率介于Pmax/M和Pmax之间。
7.根据权利要求5所述的方法,其中,d=1,由此天线i发射的功率为(Pmax/N)·(VVHii,i=1至N,以及由所述N个天线组合发射的总功率为Pmax/M。
8.根据权利要求1所述的方法,其中,所述L个信号中的每个信号利用多载波调制处理而被基带调制,且其中所述处理包括用多个子载波k的每个子载波处的发射矩阵A(k)乘以所述向量s。
9.一种无线电通信装置,该无线电通信装置包括:
N个天线;
N个无线电发射机,每个无线电发射机连接至所述多个天线中对应的一者;以及
基带信号处理器,连接至所述N个无线电发射机,通过计算一个发射矩阵A来用所述发射矩阵A处理表示L个信号[s1...sL]的向量s,以最大化所述无线电通信装置和远程装置之间的信道容量,其中所述发射矩阵A加权所述L个信号并在所述N个天线中分配所述L个信号[s1...sL]以以功率Pmax/N同步发射至所述远程装置,其中Pmax为来自所有N个天线组合的总发射功率。
10.根据权利要求9所述的无线电通信装置,其中,在N≤M的条件下,所述发射矩阵A=VD,其中M为所述远程装置的天线数量,V为HHH的特征向量,H为从所述无线电通信装置到所述远程装置的信道响应,矩阵D=I·sqrt(Pmax/N),以及I为单位矩阵。
11.根据权利要求9所述的无线电通信装置,其中,在N>M的条件下,其中M为所述远程装置的天线数量,所述N个天线中的至少两个天线发射的功率彼此不相同。
12.根据权利要求9所述的无线电通信装置,其中,所述发射矩阵A等于VD,其中V为HHH的特征向量,H为从所述无线电通信装置到所述远程装置的信道响应,D=diag(d1,...,dL),以及|dp|2为所述发射功率,其中p=1至L。
13.根据权利要求12所述的无线电通信装置,其中,当N>M时,其中M为所述远程装置的天线数量,D=sqrt(d·Pmax/N)·I,其中天线i发射的功率为(d·Pmax/N)·(VVHii,i=1,...,N,以及d=dp,其中p=1至L。
14.根据权利要求13所述的无线电通信装置,其中,d=1/z,以及
Figure FDA00001646711200031
Figure FDA00001646711200032
由此来自所述N个天线中的任意天线的最大功率为Pmax/N,而由所述N个天线组合发射的总功率介于Pmax/M和Pmax之间。
15.根据权利要求13所述的无线电通信装置,其中,d=1,由此天线i发射的功率为(Pmax/N)·(VVHii,i=1至N,以及由所述N个天线组合发射的总功率为Pmax/M。
16.根据权利要求9所述的无线电通信装置,其中,所述L个信号中的每个信号利用多载波调制处理而被基带调制,且其中所述处理包括用多个子载波k的每个子载波处的发射矩阵A(k)乘以所述向量s。
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US7194237B2 (en) 2007-03-20
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