CN1698274B - 多输入多输出无线通信的装置及方法 - Google Patents

多输入多输出无线通信的装置及方法 Download PDF

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CN1698274B
CN1698274B CN038232324A CN03823232A CN1698274B CN 1698274 B CN1698274 B CN 1698274B CN 038232324 A CN038232324 A CN 038232324A CN 03823232 A CN03823232 A CN 03823232A CN 1698274 B CN1698274 B CN 1698274B
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CN1698274A (zh
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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

本发明有关一种用于在具有N个天线的一第一装置与具有M个天线的第二装置间的多个信号的MIMO无线通信的装置、系统与方法。在所述的第一装置中,代表将发射的L个信号[s1...sL]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间受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。在所述的第二装置中,由M个天线所接收的信号经由接收权重处理,并且由所得到的结果信号来回复所述的L个信号。

Description

多输入多输出无线通信的装置及方法
技术领域
本发明涉及多输入多输出无线通信的系统及方法。
背景技术
本发明与最大化与一种在两个无线通信装置间的一无线通信连结的容量以及/或是范围的系统与方法有关。
多重输入多重输出(MIMO)无线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SNR。在MIMO无线演算的研究已经导入多重信号流同时从一装置到另一个装置的多个天线上的发射,因此大幅地提升在两个装置间的无线通信信道的数据率。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联合天线所发射的所有功率上的一功率限制以及一填充水位的解决方法(waterfilling solution)。所谓的填充水位的解决方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收发器装置的情况时。
发明内容
简单来说,本发明提供用于具有N组天线的一第一装置与具有M的天线的第二装置间的多重信号(信号流)的同步无线通信的一系统、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通信的方法,所述的方法包含:以一个发射矩阵A来处理代表L个信号的向量s,其中所述发射矩阵A是经过计算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[s1...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个天线组合的总传送功率。
根据本发明另一方面提供一种无线通信装置,其包含:a.N个天线;b.N个无线发射器,每一发射器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个无线发射器,以一个发射矩阵A来处理代表L个信号的向量s,其中所述发射矩阵A是经过计算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[s1...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个天线组合的总传送功率。
根据本发明又一方面提供一种无线通信系统,其包含:a.一第一装置;i.N个天线;ii.N个无线发射器,每一发射器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个无线发射器,以一个发射矩阵A来处理代表L个信号的向量s,其中所述发射矩阵A是经过计算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[s1...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个天线组合的总传送功率;b.第二装置,其包含:i.M个天线;ii.M个无线发射器,每一发射器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个无线发射器,以借由接收权重处理在经由多个无线接收器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[s1...sL]。
在第一装置上,代表所要发射的L组信号[s1…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,其中所述的信道遭受一功率限制,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[s1…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,而所得到的结果信号则加以整合以恢复所述的L组信号。这个方式适用于N>M以及N≤M。
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填充水位的解决方法一样的优异,而且提供更显著的执行功效。所述的无线发射器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,经由所述的发射器所漏掉的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表示两个多重天线的无线通信装置所组成的一系统图,其中多重信号流同步的经由一第一装置而发射到一第二装置去。
图2表示信号的映像与多路传输到多个天线路径以进行同步的传输。
图3表示能够执行如图1所示的MIMO无线通信技术的一无线通信装置的区块图。
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)的发射器部分的一较佳具体实施例的区块图。
图5表示所述的调制解调制器(modem)的接收器部分的一较佳具体实施例的区块图。
图6表示表示说明根据本发明所述的MIMO无线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)的一第一无线通信装置100借由一无线通信连结与具有M天线210(1)到210(M)的一第二无线通信装置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通信装置发射到所述的第二无线通信装置的状况,而由第二无线通信装置到第一无线通信装置则仅需要应用相同的分析结果。从所述的第一通信装置的N个天线道所述的第二通信装置的M个天线的多重输入多重输出(MIMO)信道响应将由信道矩阵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组信号S1,S2,...,SL。一向量s将由表示在基带上发射的L组信号[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(例如使用训练序文,回馈等)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发射内积As,其中矩阵A为空间乘法发射矩阵,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组信号的第P个的功率。装置200接收HAs+n,而且在最大比例之后为每一个模式结合,装置200计算c=AHHHHAs+AHHHn=DHD As+DHVHHHn。
如图2所示,在所述的第一装置中,来自一数元流{b}的大量的数元以一映像技术而映像到一向量s。所述的映像技术可以选择性地包括编码调制以改善连结边际。所述的数元流{b}可以是一个文件或数元的收集,以表示任何形式的数据,例如语音、影像,声音,计算数据等,被分区分或者分离成所要在空间上多任务运算或同步发射的不连续的区块的帧(通常与信号有关)。其中一个例子为多任务IEEE802.1lx帧(每一Si可能为一不同的时槽)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IEEE802.11存取点(AP),而所述的第二装置为客户端(STA)。所述的发射矩阵A以及矩阵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,在多个用于同步发射的天线分布多个信号。从矩阵乘法区块中所导出的向量x的元素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为所有天线1的向量x的加权元素的总和,元素x2为所有天线2的向量x的加权元素的总和,依此类推。
所发射矩阵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,对于一多载体调制系统,例如,一正交频分多任务(OFDM)系统,通有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(单一载子)调制系统来说,每一发射权重WT,ij可能为一带状延迟线路的滤波器。
于先前技术中关于权重dp选择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 )
遭受由多个发射天线所发射的结合于所发射的矩阵A的一全功率限制,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填充水位(waterfilling)来选择所述的权重dp。(也就是说,使用填充水位以在特征信道上放入更多的功率以及更高的SNRλP。)
所述的填充水位的解决方案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接近所有的功率从一天线路径上发射出去是可能的。
为了重复,先前技术中的方法限制从所有的所结合的天线路径上所发射的全部功率,仅仅是Σpi=PTOT<Pmax(对i=1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上的功率。
一个较好的方法在于对每一个各别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,亦即对每一个i来说,Pi≤Pmax/N。使用这样的方法,亦即与“天线功率限制”有关的方法,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为来自有所的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功率上芯片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的功率限制,所述的问题将变成:
最大的容量C限制于(AAH)ii<Pmax/N,i=1,...,N。
对于dp来说,真是很难解决的问题,因为它与在使用N个Lagrange乘法的一非线性函数(前面所述的N个限制的每一个其中之一)中找出根有关。然而,这是这两个情况的一个各别的简单非最佳解决方案。
状况1:NM:
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[s1...sL]T乘上所述的发射矩阵A,(亦即计算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均等的功率。因此,HHH为Hermitian而且(在机率为1的情况下)为全秩(full-rank full-rank,亦即表示说V是正交的。因此,(AAH)ii=(VDDHVH)ii=(VVH)ii Pmax/N=Pmax/N,即表示均等的功率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不是全秩(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=1到L,dp=d。在天线路径I上的功率由公式(d·Pmax/N)·(VVH)ii来决定。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[s1...sL]T乘上发射矩阵A(亦即计算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对于p=1到L。
方法1:设定d=1/z,其中z为
Figure G200380023232401D00071
则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所有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,所述的由多个天线所发射的所有功率为Pmax/M而由天线i(i=1到N)所发射的功率则为Pmax/N·(VVH)ii
假设在连结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1与状况2/方法2来说,来自N个天线装置的发射总功率将会与来自M个天线装置所发射的总功率相等。因此,在两个装置间的连结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(在两端的连结上具有相同的天线数)足够执行于在1dB的Shannon限制,但有助于在无线收发器中具有较小但较有效率的功率放大器的使用,因此,相较于填充水位的方法,可以达到较低的在芯片上、两个无线路径间的干扰(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,而且可以针对各别的天线特殊化或彼此不同。除此之外,即使在每一个天线使用不同的天线功率限制,每一特殊天线功率限制可能会低于或等于Pmax
所述的具有M个天线的装置200发射到100时将在M个天线上的每一个天线上遭受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的一无线通信装置的区块图。所述的装置100包含一调制解调器120、多个数字转模拟转换器(DACs)130、多个模拟转数字转换器140(ADCs)、连接于天线110(1)到110(N)的一MIMO无线收发器150,以及一控制处理器160。所述的调制解调器120,与一基带信号处理器有关,且用以执行所发射的信号(向量s)在基带的调制以及所接收的信号在基带的解调制。借由这样的执行,所述的调制解调制器120将代表所要发射的L个信号[s1...sL]T乘上发射矩阵A。所述的DACs 130为复合的DACs,用以转化代表As的数字基带调制信号成所对应的模拟信号,而所述的DACs 130连接到MIMO无线收发器150的发射路径。所述的ADCs 140将来自在所述的MIMO无线收发器150所对应的接收路径上所接收的信号转换成数字信号以提供所述的调制解调制器120的基带解调制。在基带解调制过程中,所述的调制解调制器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[s1...sL]T。所述的MIMO无线收发器150包含多个无线收发器,每一个包含相关联的一发射器152(i)与一接收器154(i),并且经由一对应的开关156(i)而连接到一对应的天线上。每一发射器包含一功率放大器(没有表示于图中)。所述的MIMO无线收发器150可以式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无线收发器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日申请),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制器120。图4与图5分别表示所述的用于一多重载子,例如,正交频分多任务(OFDM)应用的调制解调制器120的发射器部分120A与接收器部分120B的区块图。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选择频率的消耗信道(frequency-selective fadingchannels)的性能。请参照图4所示,所述的调制解调制器的发射器部分120A包含一倒频器区块310、一折积编码器315、插入器区块320、执行以OFDM次载波k不同的发射矩阵A的矩阵乘法(亦即A=A(k))的一空间多任务器区块325、一次载波调制器330、一逆快速傅立叶转换(IFFTs)以及一低通滤波器的区块340。所述的低通滤波器区块340的输出连接到所述的DACs 130(图3)。一序文产生器350也同样连接到所述的DACs 130。如同图4所示,假设所述的调制解调制位在N天线的装置,有L个区块315、320与325的场合用以执行在每一基带发射信号流以及N个区块335、340与130的场合用以处理与每一发射天线路径相关的信号。
如图5所示的接收器部分120B包含重新取样的一区块415,低通滤波器区块420、数值控制震荡器(NCOs)、FFTs区块430、均衡器区块435,在该均衡器中,所述的接收权重应用到所接收的信号上、一解插入器区块440以及一折积译码器445区块。一序文处理与自动增益控制区块(AGC)450以及一信道估算区块455也同样提供来用于信道估算的计算以及其它的功能。所述的序文与AGC区块450回复一在所接收信号上的一序文而所述的信道估算器445产生对于所述的信道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到所述的FFT区块430的输出。假设所述的调制解调器位在一N天线的装置,有N个区块415、420与425的场合用以执行每一所接收信号流以及L个区块435、440与445的场合,用以回复所述的L个信号。
从上面图4与图5的说明所建议的可知,一第一装置借由发射一已知的OFDM训练序文,例如,一封包序文,一旦通过每一个天线,即传递信道响应信息到一第二装置。对于一频率频域的执行来说,所述的第二装置执行已知这个信道信息的一空间频率分解(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。这在连结上假设了互惠性,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),该申请案已经列入本发明的参考资料中。有关以次载体指数为函数的群集顺序的信息以及特征信道可能也可以包含于序文中。每一个次载波具有一个相关的群集顺序以用在每一个特征信道上。在发射器部分120A中,一多维的向量格状编码器(VTE)可能用来映像来自序文的输入位而到OFDM群集符号上。多维的VTE’s的实施例已熟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。
一调制解调器可以建构成应用前面所描述的功率限制原则到一时域系统的执行,其中带状延迟线路的滤波器会被使用。
图6说明的这里所叙述的功率限制相较于最佳化的填充水位方法是更有效率。
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[s1...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的遭受一功率限制信道的容量,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,所述的发射矩阵A分布在N个天线中的L个信号[s1...sL]以同步发射到所述的第二装置。同样地,所提供的一无线通信装置包含N个天线,N个无线发射器,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发射器的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[s1...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到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分布所述的L个信号[s1...sL]以通过N个天线而同步发射到所述的第二装置。所述的发射矩阵A计算遭受与一个或多个天线不同或者是与N个天线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可能会计算遭受与N个天线的每一个相同的功率限制相当于由所有的N个天线所发射的一总最大功率总和除以N值的功率限制。
前面所述的说明仅作为本发明的实施例。

Claims (15)

1.一种在具有N个天线的一第一装置与具有M个天线的一第二装置间通过一信道传送信号的方法,所述的方法包含:
以一个发射矩阵A来处理代表L个信号的向量s,其中所述发射矩阵A经过计算,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加权L个信号[s1...sL]并且在用于同步发射的N个天线中分配L个信号[s1…sL]到第二装置;以及
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个天线组合的总传送功率。
2.如权利要求1所述的方法,其特征在于当N>M时,所述N个天线中,至少二个天线所发射的功率彼此不相同。
3.如权利要求1所述的方法,其特征在于所述的发射矩阵A等于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,D=diag(d1,…,dL)以及对于P=1到L而言,|dp|2为传送功率。
4.如权利要求3所述的方法,其特征在于当N>M时,D=sqrt(d·Pmax/N)·I,其中经由天线i所发射的功率,对于i=1到N而言,为(d·Pmax/N)·(VVH)ii,且d=dp对于p=1到L而言。
5.如权利要求4所述的方法,其特征在于d=1/z,而且
Figure FFW00000049692800011
因此来自所述的N个天线任何一天线的最大功率等于Pmax/N,而由组合的N个天线组合所发射的总功率介于Pmax/M与Pmax间。
6.如权利要求4所述的方法,其特征在于d=1,因此,经由天线i,i=1到N,所发射的功率为(Pmax/N)·(VVH)ii,而由组合的N个天线所发射的总功率为Pmax/M。
7.如权利要求1所述的方法,其特征在于还包含在所述的第二装置接收经由所述的第一装置所发射的M个天线信号,以及包含以接收权重处理在M个天线的每一天线所接收的信号并结合所得到的结果信号以回复所述的L个信号。
8.如权利要求1所述的方法,其特征在于L个信号的每一信号利用一多重载子调制程序而基带调制,其中所述的处理包含在多个次载波k的每一个上以所述的发射矩阵A(k)乘上所述的向量s。
9.一种用以通过一信道来传送信号的无线通信装置,所述无线通信装置包含:
N个天线;
N个无线发射器,每一发射器连接到多个天线中对应的一个;
一基带信号处理器,连接到所述的N个无线发射器,以一个发射矩阵A来处理代表L个信号的向量s,其中所述发射矩阵A经过计算以便使得在所述无线通信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加权L个信号[s1...sL]并且在用于同步发射的N个天线中分配L个信号[s1…sL]到所述远端装置;当N≤M时,所述的发射矩阵A=VD,其中M为所述远端装置的天线数量,V为HHH的特征向量,H为从所述无线通信装置到所述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个天线组合的总传送功率。
10.如权利要求9所述的无线通信装置,其特征在于当N>M时,所述N个天线中,至少二个天线所发射的功率彼此不相同。
11.如权利要求9所述的无线通信装置,其特征在于其中所述的发射矩阵A等于VD,其特征在于V为HHH的特征向量,H为从所述无线通信装置到所述远端装置的信道响应,D=diag(d1,…,dL)以及对于P=1到L而言,|dp|2为传送功率。
12.如权利要求11所述的无线通信装置,其特征在于当N>M,其中所述的基带信号处理器以经过计算的所述发射矩阵A乘上所述的向量s,其中D=sqrt(d·Pmax/N)·I,其中经由天线i所发射的功率,对于i=1到N而言,为(d·Pmax/N)·(VVH)ii,且d=dp对于p=1到L而言。
13.如权利要求12所述的无线通信装置,其特征在于d=1/z,而且
Figure FFW00000049692800031
因此来自所述的N个天线任何一天线的最大功率等于Pmax/N,而由N个天线组合所发射的总功率介于Pmax/M与Pmax间。
14.如权利要求12所述的无线通信装置,其特征在于d=1,因此经由天线i,i=1到N,所发射的功率为(Pmax/N)·(VVH)ii,而由组合的N个天线所发射的总功率为Pmax/M。
15.如权利要求9所述的无线通信装置,其特征在于L个信号的每一信号利用一多重载子调制程序而基带调制,其中所述的基带信号处理器在多个次载波k的每一个上,以所述的发射矩阵A(k)乘上所述的向量s。
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