CN101167321A - 正交频分无线通信系统的导频信号传输 - Google Patents
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Abstract
本发明提供了从移动台或基站发射的导频符号的传输图案。该图案允许改善所发射的导频符号的接收。此外,还提供了没有来自同一频率和同一时隙的不同移动台的干扰和/或偏差的复用导频符号能力的方案。在跳频OFDMA中,用户间的导频符号可交叠。交叠用户之间的正交性是通过使用正交导频序列、扇区和小区专用扰频码来确保的。
Description
技术领域
本文献一般涉及无线通信,尤其涉及正交频分无线通信系统中的导频信息传输。
背景技术
正交频分多址(OFDMA)系统利用正交频分复用(OFDM)。OFDM是多载波调制技术,其将整个系统带宽分成多个(N)正交调频子载波。这些子载波也可称为副载波(tone),频率点(bin),和频率信道。每个子载波可以用数据调制。多达N个调制符号可在每个OFDM符号周期中总共N个子载波上发送。这些调制符号可通过N点快速傅立叶变换(IFFT)转换到时域从而产生含N个时域码片或采样的符号。
在跳频通信系统中,数据是在不同时间间隔中不同频率子载波上传输的,这可称为“跳频周期(hop period)”。这些频率子载波可由正交频分复用、其他的多载波调制技术或某些其他构造提供。借助跳频,数据传输以伪随机方式从一个子载波跳频到另一个子载波。跳频提供频率多样性并允许数据传输更能耐受恶化的路径影响,如窄带干扰、干扰、衰落,等等。
OFDMA系统可同时支持多个移动台。对于跳频OFDMA系统,给定移动台的数据传输可在与特定频率跳频(FH)序列关联的“业务”信道上发送。该FH序列在每个跳频周期中指定特定的子载波用于数据传输。多个移动台中多个数据传输可在多个业务信道上同时发送,该业务信道与不同FH序列关联。这些FH序列可定义为彼此正交,以便仅一个业务信道,且因此仅一个数据传输在每个跳频周期中使用每个子载波。通过使用正交FH序列,多个数据传输通常彼此不干扰,同时享有频率多样性的好处。
为了恢复经无线信道发送的数据,精确估计发射机和接收机之间的无线信道是必要的。信道估计通常是通过从发射机发送导频并在接收机测量导频执行的。导频信号由导频符号组成是发射机和接收机公知的先验知识。因此接收机可基于接收的符号和公知的符号来估计信道响应。
从任意移动台发送到基站的每个传输通常称为“反向链路”传输,其一部分在跳频周期中被分配来传输导频符号。一般地,导频符号的数量决定信道估计的质量,且因此决定数据包误码率性能。然而,使用导频符号会引起可实现的有效传输数据率的减小。也就是,分配给导频信息的带宽越大,则数据传输可利用的带宽就越小。
一种类型的FH-OFDMA系统是分组跳频系统(blocked hop system),其中多个移动台被分配给邻近频率组和符号周期。在这样的系统中,可靠地从移动台接收导频信息同时减小分配给导频信息的带宽是重要的,因为分组内可用于导频和数据传输的符号和副载波的数量有限。
发明内容
在一个实施例中,导频符号图案(pattern)是为从移动台或基站传输的导频符号提供的。该图案允许传输的导频符号的接收和解调改进。
在另一个实施例,还提供了在同一时隙在OFDM系统中,改进在同一频率上复用来自基站同一扇区的不同移动台的无干扰和/或无偏差的导频符号的能力的方案。
在进一步的实施例中,提供了在OFDM系统中在相同频率和同一时隙上减小从相邻小区中不同移动台传输的导频的偏差或干扰的方案。
在其他实施例中,提供了改变导频符号图案的方法。而且,在进一步的其他实施例中,提供了产生导频符号的方法。
附图说明
结合附图,本实施例的特征,性质,和优点可从下面给出的详细说明中变得显然,附图中相同的标号表示相同的部分,其中:
图1示出按照实施例的多址接入无线通信系统;
图2示出按照实施例的多址接入无线通信系统的谱分配方案;
图3A示出按照实施例的导频分配方案的方框图;
图3B示出按照另一个实施例的导频分配方案的方框图;
图4A示出按照一个实施例的导频符号加扰(scrambling)方案;
图4B示出按照实施例的导频符号加扰方案;
图5示出在按照一个实施例的多址接入无线通信系统中具有多个扇区的基站;
图6示出按照另一个实施例的多址接入无线通信系统;
图7示出多入多出(multi-input multi-output)的多址接入无线通信系统中发射机系统和接收机系统实施例的方框图;
图8示出按照一个实施例的导频符号生成方法的流程图;和
图9示出按照一个实施例改变导频符号图案方法的流程图。
具体实施方式
参考图1,其示出按照实施例的多址接入无线通信系统。基站100包括多个天线组102,104,和106每个都包括一个或多个天线。在图1中,每个天线组102,104和106仅示出一个天线,然而,每个相应于基站100的扇区的天线组可采用多个天线。移动台108与天线104通信,这里天线104在前向链路114上传输信息至移动台108,并在反向链路112上从移动台108接收信息。移动台110与天线106通信,这里天线106在前向链路118上传输信息至移动台110,并在反向链路116上从移动台110接收信息。
每个天线组102,104和106和/或天线在其中通信的区域常称为基站的扇区。在该实施例中,天线组102,104,和106每个都被设计来分别与基站100覆盖的区域的扇区120,122,和124中的移动台通信。
基站可以是与终端通信的固定站,并且也可以称为接入点,节点B,或某些其他术语。移动台也可称为移动站、用户设备(UE)、无线通信设备、终端、接入终端或某些其他术语。
参考图2,其示出了多址接入无线通信系统的谱分配方案。多个OFDM符号200是在T个符号周期和S个频率子载波上分配的。每个OFDM符号200包括T个符号周期中的一个符号周期和S个子载波的副载波或频率子载波。
在OFDM跳频系统中,一个或多个符号200可分配至给定的移动台。在如图2所示的分配方案的实施例中,符号的一个或多个跳频区,如跳频区202分配到反向链路上通信的一组移动台。在每个跳频区内,可随机化符号的分配从而减少潜在的干扰并提供频率多样性对抗恶化的路径影响。
每个跳频区202包括符号204,其被分配给一个或多个与基站的扇区通信并被分配给跳频区的移动台。在其他实施例中,每个跳频区被分配给一个或多个移动台。在每个跳频周期或帧期间,T个符号周期和S个子载波内的跳频区202的位置按照跳频序列而改变。此外,跳频区202内单个移动台的符号204的分配可在每个跳频周期改变。
跳频序列可伪随机地、随机地或按照预定的序列为每个跳频周期选择跳频区202的位置。同一基站的不同扇区的跳频序列被设计为彼此正交从而避免与同一基站通信的移动台中“小区内”(intra-cell)干扰。进一步,每个基站的跳频序列相对附近基站的跳频序列可以是伪随机的。这有助于随机化与不同基站通信的移动台中“小区间”(inter-cell)干扰。
在反向链路通信的情形中,跳频区202的某些符号204被分配给从移动台传输到基站的导频符号。导频符号向符号204的分配应优选支持空分多址(SDMA),这里如果相应于不同移动台的空间特征(spatial signature)有足够差异,在同一跳频区上交叠的不同移动台的信号可由于扇区或基站的多个接收天线而分开。为了更精确地提取和解调不同移动台的信号,各反向链路信道应被精确估计。因此,令人期望的是,反向链路上的导频符号使得能够在扇区内每个接收天线处分开不同移动台的导频特征,以便随后对从不同移动台接收的导频符号应用多天线(multi-antenna)处理。
分组跳频(block hopping)可被用于前向链路和反向链路,或取决于系统仅用于反向链路。应该注意,虽然图2描绘的跳频区200具有7个符号周期的长度,跳频区200的长度可以是任何期望的量,可在跳频周期之间,或在给定跳频周期中的不同跳频区之间改变大小。
应该注意,虽然图2的实施例是就利用分组跳频描述的,但分组的位置不需要在两个连续的跳频周期或所有跳频周期之间改变。
参考图3A和3B,它们示出按照几个实施例的导频分配方案的方框示意图。跳频区300和320是由S个子载波或副载波以T个符号周期限定的。跳频区300包括导频符号302而跳频区320包括导频符号322,具有可用于数据符号和其他符号的剩余符号周期和副载波组合。在实施例中,每个跳频区的导频符号位置,即NT个连续OFDM符号上的一组NS个相邻副载波应具有靠近跳频区边缘的导频副载波。这通常是因为无线应用中典型的信道是时间和频率的相对慢的函数,因此在时间和频率上跨跳频区的信道一阶近似,如一阶泰勒展开提供关于信道条件的信息,这为给定移动台估计信道是足够的。因此,优选在跨信道的时间和频率范围的信道上为来自移动台符号的适当接收和解调估计一对信道参数,也就是信道的常数分量、泰勒展开的零阶项,和线性分量,泰勒展开的一阶项。一般地,常数分量的精确估计与导频分布(placement)无关。线性分量的估计精度一般优选以跳频区边缘的导频副载波实现。
导频符号302和322是在邻近导频符号簇304,306,308和310(图3A)以及324,326,328和330(图3B)中设置的。在实施例中,跳频区内每个簇304,306,308和310(图3A)以及324,326,328,和330(图3B)在给定跳频区内具有固定数目的,且通常为相同的数目的导频符号。实施例中,邻近导频符号中簇304,306,308和310(图3A)以及324,326,328和330(图3B)的利用可考虑载波间干扰引起的多用户干扰的影响,载波间干扰由高多普勒频移和/或符号延迟扩展引起。进一步,如果来自设定在同一跳频区的移动台中的导频符号基本以不同功率水平被接收,较强移动台的信号可对弱移动台产生相当大量的干扰。当过度延迟扩展引起信道泄漏(leakage)时,即当集中在超过OFDM符号的循环前缀的抽头(tap)处的信道能量部分变得相当大时,干扰量在跳频区边缘处更高,如子载波1和子载波S,在边缘OFDM符号处干扰量也更强,如符号周期1和T。因此,如果导频符号完全位于跳频区的边缘,信道估计精度可能恶化,且在干扰估计中可能有偏差。因此,如图3A和3B所示,导频符号被靠近跳频区的边缘设置,然而,避免所有导频符号位于跳频区的边缘的情况。
参考图3A,跳频区300由导频符号302组成。在信道具有明显的频率选择性而非时间选择性的情形中,导频符号302位于邻近导频符号簇304,306,308和310中,每个导频符号簇304,306,308和310跨多个符号周期和一个频率副载波。频率副载波优选被选择靠近跳频区300的频率范围的边缘,但不是精确位于边缘。在图3A所示的实施例中,给定簇中没有导频符号302位于边缘频率副载波处,且在每个簇中,仅导频符号可在边缘符号周期处。
导频符号302的邻近导频符号簇的“水平”形状背后的一个原理是,对于较高频率选择性的信道,一阶(线性)分量在频域中比在时域中更强。
应该注意,在图3A的实施例中,每个簇中的一个或更多导频符号可位于与不同簇中一个或多个导频符号不同的副载波处。例如,簇304可位于副载波S而簇306可位于副载波S-1。
参考图3B,在具有明显时间选择性而非频率选择性的信道情形中,导频符号322被设置在邻近导频符号的簇324,326,328和330中,且每个簇跨多个频率副载波,但具有同一跳频区320的符号周期。可包括在跳频区320边缘的OFDM符号,具有限定S个子载波的频率范围的最大副载波,如副载波S,或最小副载波,如副载波1的符号作为部分导频符号,因为可以有在跳频区320边缘的导频符号322。然而,在图3B所示的实施例中,每个簇中仅一个导频符号可分配给最大或最小频率子载波。
在图3B所示的实施例中,具有较高时间选择性的信道可具有典型的图案,该典型图案可以是通过对具有较高频率选择性(图3A)的信道选择的图案进行90度旋转而获得。
应该注意,在图3B的实施例中,每个簇中一个或多个导频符号可被分配给与不同簇中一个或多个导频符号不同的符号周期。例如,簇324可处于与簇326不同的符号周期T。
此外,如图3A和3B的实施例所示,提供导频图案以便簇304,306,308和310(图3A)和324,326,328和330(图3B)优选相对跳频区中心是对称的。簇相对跳频区中心的对称性可提供改进的相对信道时间和频率响应的同时的信道估计。
应该注意,虽然图3A和3B示出每个跳频区四个导频符号簇,但在每个跳频区中使用较少或较多的簇。进一步,每导频符号簇的导频符号的数目也可以改变。导频符号的总数目和导频符号簇是基站成功解调在反向链路上接收并进而估计基站和移动台之间信道的数据符号所要求的导频符号数目的函数。而且,每个簇不必具有相同数目的导频符号。在实施例中,可在单个跳频区上复用的移动台的数目可等于跳频区中导频符号的数目。
此外,虽然图3A和3B示出为具有频率选择性或时间选择性的信道所设计的导频符号簇,导频图案可以是这样的,即在同一导频图案中有用于频率选择性信道的簇,也有用于时间选择性信道的簇,如某些簇设置在簇304,306,308或310的图案中,某些簇被设置在簇324,326,328或330的图案中。
在某些实施例中,选择使用的导频图案可以基于信道被优化的条件。例如,对于可能具有高速运动,如车载的移动台的信道,时间选择性导频图案是优选的,然而,对于低速移动的移动台,如行人,可利用频率选择性导频图案。在其他实施例中,可基于信道条件选择导频图案,并在预定数目的跳频周期之后做出决定。
参考图4A和4B,其示出按照进一步实施例的导频分配方案。在图4A中,跳频区400包括设置在簇402中的导频符号C1,q,C2,q和C3,q;设置在簇404中的C4,q,C5,q和C6,q;设置在簇406中的C7,q,C8,q和C9,q;和设置在簇408中的C10,q,C11,q和C12,q。在实施例中,为了改进跳频区中空间多样性,多个移动台提供交叠的导频符号,不同移动台的导频符号应以该方式在同一0FDM符号周期和副载波上复用,因此当导频符号在基站的天线簇处被接收时基本正交。
在图4A中,C1,q,C2,q,C3,q,C4,q,C5,q,C6,q,C7,q,C8,q,C9,q,C10,q,C11,q和C12,q中每个导频符号被分配给跳频区400的多个移动台,也就是每个符号周期包括来自大量不同移动台的多个导频符号。导频符号簇(如簇402,404,406,和408)中每个导频符号,是以这样的方式产生和传输的,即簇中导频符号的接收机,如基站,可接收这些导频信号,因此它们相对来自同一簇中每个移动台的导频符号正交。这可通过施加预定相移来实现,如通过标量函数(scalar function)乘以构成由每个移动台传输的导频符号的每个采样实现。为了提供正交性,表示每个移动台的每个簇中标量函数序列的矢量内积可以为零。
进一步,在某些实施例中,优选每个簇的导频符号与跳频区的每个其他簇的导频符号是正交的。这可通过利用导频符号每个簇中每个移动台的导频符号的标量函数的不同序列,以与为来自不同移动台的每个簇内导频符号提供正交性相同的方式提供。可通过为特定移动台的特定簇的每个导频符号选择标量倍数(scalar multiples)序列而做出正交性的数学判断,该移动台的矢量与表示用于所有簇中其他移动台和其他簇中同一移动台的导频符号的标量倍数序列的矢量正交,如内积为零。
在实施例中,可支持移动台的数目等于每导频符号簇提供的导频符号的数目,这里提供了每个簇的导频符号的正交性。
在图4A和4B的实施例中,Q个交叠用户中第q个用户,1≤q≤Q,使用大小为NP的序列S,这里NP是导频副载波的总数目(在图4A和4B中,NP=12):
这里(T)表示包含该序列的矩阵的转置。如上所述,在导频符号的每个簇中,移动台不同,则标量函数的序列也不同,以便通过导频符号之间干扰的减小,获得对各信道一致的估计。而且,序列应是线性不相关的,以便优选地没有序列或矢量是剩余序列的线性组合。数学上,这是可定义的,因为NP×Q矩阵
S=[S1...SQ](2)
是满列秩(full column rank)矩阵。应该注意,上面表达式(2)中,矩阵Q≤NP。也就是,交叠移动台的数目应不超过跳频区中总导频符号的数目。
基于上述讨论,具有满秩的任意序列Q的集合S使得能够实现一致的信道估计。然而,在其他实施例中,实际估计精度可取决于S的相关性。在实施例中,如可用等式(1)判断的那样,当信道中任意两个序列相互(类)正交,则可提高性能。数学上,该条件如下定义
这里Hk是相应于第k个导频符号的复数信道增益,1≤k≤NP。在时间和频率不变信道H1=H2=…=HNP中,条件(3)减弱为相互正交序列的要求:
对任意从典型信道集合实现的可能信道应用该条件是不可行的。实际上,在信道具有有限时间和频率选择性时可满足表达式(3),这是具有相对小延迟扩展的步行者信道的情形。然而,对于车辆信道和/或具有相当大延迟扩展的信道,条件可显著不同,因而导致性能衰退。
如上面参考图3A和3B的讨论,导频分配图案由几个靠近跳频区边缘分布的导频符号簇组成,这里每个簇是时间(图3A)和/或频率(图3B)上邻近的。因为每个簇中信道变化通常是有限的,这是由于导频符号在时间和频率上的邻近的特性以及信道的时间和频率连续性。因此,使不同序列在每个簇上正交使条件(3)被满足。该解决方案的潜在缺点是可在每个簇上正交的交叠的移动台数目受限于簇的大小,这里表示为NC。在图4A和图4B所示的例子中,NC=3,且因此在该实施例中,最大Q=3个移动台可以是独立正交的。实际上,在许多实际应用情形中,相当小量的Q是足够的。当Q>NC时,保持所有移动台在每个簇上正交有困难,因为可能有符号间干扰。因此,近似正交是充分的,其中如果Q>NC,则时间和/或频率的某些性能损失改变信道。
在实施例中,标量函数S=[S1…SQ]序列的设计参数的集合可定义如下:
*任意两个序列在整个导频符号的集合上正交,因而满足
*NC个序列的后续组是这样的,即组内任意两个序列在任意导频簇上是正交的:
*所有序列的所有元素Sk,q具有基本相等的绝对值,如近似相同的功率。
这里MC表示大小为NC的簇的总数目,因此导频数目NP=MCNC。
在实施例中,序列S=[S1…SQ]是用指数函数建立的,因此每个序列提供的每符号能量相同。进一步,在该实施例中,NC个序列组可在每个簇内相互正交而无论簇大小,因为指数不局限于特定的倍数,且用在每个其他簇中的序列跨所有导频符号,这是通过如下方式实现的,(i)在每个簇内定义指数序列;和(ii)跨多个簇移动(populating)簇内部分。这可从等式(7)中看到,这里定义了N×N离散傅立叶变换(DFT)基础。
上面的表达式(7)可以紧凑块形式表示为:
S=[S1,...,SQ]=<F(MC)F(NC)>:,1∶Q(8)
其中<·>:,1∶Q表示跨初始矩阵的列1到列Q的矩阵块。S更一般的形式由下式给出
S=[S1,...,SQ]=<VU>:,1∶Q(9)
其中U是任意的NC×NC单位矩阵(U*U=INP),且V是任意MC×MC单位矩阵(U*U=IMC)。
在实施例中,可支持的移动台的数目等于每导频符号簇提供的导频符号的数目,这里跨每个簇的导频符号具有正交性。
在实施例中,用来乘导频符号的采样的指数函数是用离散傅立叶变换函数生产的,这是公知的。在离散傅立叶变换函数用于产生供传输的符号的实施例中,在产生供传输的符号过程中,用离散傅立叶变换函数形成符号的过程中应用额外的相移。
在图4A和4B的上述中,每个移动台的每个簇中表示标量函数的序列的矢量内积可以是零。然而,在其他实施例中不是这样。可以仅在每个移动台的每个簇中标量函数的序列之间提供拟正交性。
进一步,在这些情形中,这里分配给跳频区的移动台的数目小于分配给跳频区的导频符号的数目,标量移位(scalar shift)还可以在基站处被解码,以便用来执行干扰估计。因此,这些导频符号可用于干扰估计,因为它们相对分配给跳频区的其他移动台的导频符号是正交的或拟正交的。
参考图5,其示出在按照实施例的多址接入无线通信系统中具有多个扇区的基站。基站500包括天线502,504和506的多个天线组。在图5中,每个天线组502,504和506仅示出一个天线,然而,也可利用多个天线。除了提供给不同移动台的不同物理位置的空间多样性,每个天线组502,504和506的多个天线可用来在基站处为在相应扇区中从移动台传输的信号提供空间多样性。
基站500的每个天线组502,504和506经配置来与基站500覆盖的扇区中的移动台通信。在图5的实施例中,天线组502覆盖扇区514,天线组504覆盖扇区516,而天线506覆盖扇区518。在每个扇区内,如参考图4的描述,从移动台传输的导频符号可在基站处精确地被解调并用于信道估计,以及其他功能,这是由于所有扇区间导频符号簇之间的正交性或近似正交性。
然而,靠近扇区边界的移动台可能存在扇区内干扰,如靠近扇区514和516边界的移动台510。在这样的情形中,来自移动台510的导频符号功率比来自扇区514和516中其他移动台的导频符号的功率低。在这样的情形中,最终移动台510可受益于两个扇区天线处的接收,特别是当服务扇区(即扇区516)的信道信号可在天线504增加功率时衰落时。为了充分受益于扇区514的天线502的接收,应提供扇区514的天线502之间移动台510的信道的精确估计。然而,如果相同或基本相同序列用于具有当前导频设计的不同扇区中的导频符号的标量倍数,则移动台510传输的导频符号可能会与由预定在扇区514中的移动台508传输的导频符号冲突,扇区514与扇区516在同一跳频区上。进一步,在某些情形中,根据基站用来控制移动台的功率控制策略,来自移动台508的符号的功率水平可显著超过来自扇区514的天线组502的移动台510的信号水平,特别是在移动台508靠近基站500时。
为了抵抗可能出现的扇区内干扰,扰频码可用于移动台。对于单个移动台,扰频码是唯一的,或对于每个与单个扇区通信的移动台扰频码相同。在实施例中,这些特定扰频码允许天线组502识别移动台508和510的复合信道。
在单个移动台被分配给整个跳频区的情形中,可提供用户专用扰频序列以使给定扇区中每个移动台利用同一导频序列;这些序列的构成是参考图4A和4B描述的。在图5所示的例子中,移动台508,510和512可具有不同的用户专用扰频序列并因此可实现充分的信道估计。
在多个移动台被或可能被分配到同一跳频区的情形中,可用两种方法来减少簇内干扰。首先,如果簇大小NC大于或等于每个扇区中交叠移动台的数目Q乘以小区中扇区的数目,则可利用用户专用扰频序列。如果是这样的情形,则Q个用户专用扰频码的不同集合可分配给不同扇区。
然而,如果簇大小NC小于每个扇区中交叠移动台的数目Q乘以小区中扇区的数目,则系统设计的目标是使NC保持有限的导频开销是重要的,用户专用扰频码不能有效减小小区间干扰。在这样的情形中,扇区专用扰频序列可与用户专用扰频序列一起使用。
对于同一扇区中的所有移动台,扇区专用扰频序列是乘以序列S=[S1…SQ]的各元素的NP个复函数的序列 在由S个扇区组成的小区中,S个扇区专用扰频序列X1,…,XS的集合可用来乘以移动台的序列S=[S1…SQ]。在这样的情形中,不同扇区内移动台(例如具有利用同一用户专用扰频序列S=[S1…SQ]的移动台的扇区514和516)可能因为用来乘以用户专用扰频序列的不同的扇区专用扰频序列XS1和XS2而不同。
类似于用户专用扰频,优选X1,…,XS的所有项具有近似相等的绝对值,从而在导频符号问保持近似相等的功率。在其他实施例中,优选X1,…,XS的项是这样的,即相应于用户专用和扇区专用扰频序列的任意两个组合的导频符号簇中的任意对导频符号需满足条件(3)。一种实现每个扇区专用序列X1,…,XS内容选择的方式为彻底检索序列,以便每个序列的元素是从常模(PSK)星座,如QPSK,8-PSK提取的。这些选择标准可以是依赖于“最糟情形"信道估计误差方差,该“最糟情形”信道估计误差方差相应于不同扇区的移动台和基于潜在信道环境的不同的用户专用扰频的“最糟”组合。信道估计误差可根据信道的统计特性分析计算。特别地,根据预期衰落模型和诸如移动台速率的参数假设信道相关结构的信道估计的协方差矩阵的对角和(trace),限定了时间选择性,并且传播延迟扩展限定频率选择性。最小可实现信道估计误差的分析表达受限于实际信道给定相关结构是本领域公知的。其他类似标准可用来优化X1,…,XS的选择。
在正交幅度调制用作调制方案的实施例中,扇区专用扰频序列X1,…,XS的集合可如下面表1所示那样利用。表的每个项规定每个XK,S的I和Q个分量,1≤s≤S且1≤k≤NP,其中S=3,NP=12。
表1
k | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
S=1 | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} | {+1,+0} |
S=2 | {+1,+0} | {+1,+0} | {-1,+0} | {+1,+0} | {+0,-1} | {+1,+0} | {+1,+0} | {+0,-1} | {+0,+1} | {+0,+1} | {+0,+1} | {+0,+1} |
S=3 | {+0,+1} | {-1,+0} | {+1,+0} | {+1,+0} | {+0,+1} | {+0,-1} | {+0,-1} | {+0,+1} | {+1,+0} | {+0,-1} | {+1,+0} | {-1,+0} |
在某些实施例中,通信网络中每个小区可利用相同序列的扇区专用扰频序列。
参考图6,其示出按照另一个实施例的多址接入无线通信系统600。当相同集合的用户专用和扇区专用扰频序列用在多个小区中时,如小区602,604,和606,来自邻近小区的干扰可由于导频符号冲突而导致信道估计精度降低。例如,感兴趣扇区中的信道估计可由于来自邻近小区的移动台的信道而偏差,该邻近小区的移动台具有相同的用户专用和扇区专用扰频。为了避免该偏差,除了用户专用扰频和扇区专用扰频之外,也可以利用小区专用扰频。小区专用扰频方案可定义为 YC是乘以小区中每个移动台的导频符号的各序列的标量函数的矢量。导频符号的总序列 其相应于第c个小区的第s个扇区中第q个用户专用扰频,可如下定义。如果利用扇区专用扰频:
Zk,(q,s,c)=Sk,q·Xk,s·Yk,c,1≤k≤NP,1≤s≤S,c=1,2,.... (10)
如果不用扇区专用扰频:
Zk,(q,s,c)=Sk,q·Yk,c,1≤k≤NP,1≤s≤S,c=1,2,.... (11)
如上面提到的那样,在Q>1时推荐使用扇区专用扰频,而在Q=1时不推荐使用。
与用户专用和扇区专用扰频不同,小区专用扰频序列不需要特别优化。可以使用的两个设计参数是:
*小区专用扰频序列的所有元素具有相等的模(modulus)。
*小区不同,小区专用扰频序列也不同。
在基站网络上没有出现小区专用扰频序列预定分配时,来自一些常模(PSK)星座,如QPSK,8-PSK的(伪)随机小区专用扰频序列可用来形成Y小区专用序列。为了进一步增强小区专用扰频的随机化和避免扰频序列的坏的稳定的组合,小区专用扰频可以(伪)随机方式周期改变。在某些实施例中,周期改变可以是每个帧,每超帧(superframe),或多个帧或多超帧。
图7是MIMO系统700中发射机系统710和接收机系统750的实施例方框图。在发射机系统710,大量数据流的业务数据从数据源712提供给传输(TX)数据处理器714。在实施例中,每个数据流是通过各发射天线发射的。基于为提供编码数据的数据流选择的特定编码方案,TX数据处理器714为每个数据流格式化、编码和交织业务数据。
每个数据流的编码的数据可用OFDM与导频数据复用。导频数据通常是以已知的方式处理并可用在接收机系统从而估计信道响应的已知数据图案。然后根据为数据流选择的特定调制方案(如BPSK,QSPK,M-PSK,或M-QAM),调制每个数据流的复用的导频和编码的数据,从而提供调制符号。每个数据流的数据率,编码和调制可通过在控制器130上执行的指令判断。
然后所有数据流的调制符号被提供给TX处理器720,该处理器720可进一步处理调制符号(如,OFDM)。然后TX处理器720提供NT个调制符号流给NT个发射机(TMTR)722a到722t。每个发射机722接收和处理各符号流从而提供一个或多个模拟信号,并进一步调节(如,放大,滤波,和上变换)模拟信号从而提供适于在MIMO信道上传输的调制信号。然后,来自发射机722a到722t的NT个调制信号分别通过NT个天线124a到124t发射。
在接收机系统750处,传输的调制符号由NR个天线752a到752r接收,且从每个天线752接收的信号被提供给各接收机(RCVR)754。每个接收机754调节(如滤波,放大,和下变换)各接收的信号,数字化经调节的信号从而提供采样,并进一步处理采样从而提供相应的“接收的”符号流。
然后根据特定的接收机处理技术,RX数据处理器760接收和处理从NR个接收机754接收的NR个接收的符号流,从而提供NT个“检测的”符号流。下面进一步详细说明RX数据处理器760的处理。每个检测的符号流包括是为每个相应数据流传输的调制符号的估计的符号。然后RX数据处理器760解调、去交织和解码每个检测的符号流从而为每个数据流恢复业务数据。RX数据处理器760的处理对发射机系统710的TX处理器720和TX数据处理器714执行的处理有互补性。
RX处理器760可获得NT个发射和NR个接收天线之间信道响应的估计,如基于与业务数据复用的导频信息。按照存储在存储器,如存储器772中的导频图案,RX处理器760可识别导频符号,该存储器772识别分配给每个导频符号的频率子载波和符号周期。此外,用户专用、扇区专用和小区专用的扰频序列可存储在存储器中,因此它们可被RX处理器760用来乘以接收的符号,以便产生正确的解码。
由RX处理器760产生的信道响应估计可用来在接收机处执行空间、空间/时间处理,调整功率水平,改变调制速率或方案,或其他动作。RX处理器760可进一步估计检测的符号流的信号与干扰噪声比(SNR),以及可能的其他信道特征,并将这些量提供给控制器770。RX数据处理器760或控制器770可进一步获得系统“操作”SNR的估计。然后控制器770提供信道状态信息(CSI),这些信息包括关于通信链路和/或接收的数据流的多种类型的信息。例如,CSI可仅包括操作SNR。然后TX数据处理器778处理CSI,该TX数据处理器也为来自数据源776、被调制器780调制、并被发射机754a至754r调节,并传输回发射机系统710的大量数据流接收业务数据。
在发射机系统710,来自接收机系统750的调制信号被天线724接收、被接收机722调节、被解调器740解调,并被RX数据处理器742处理从而恢复由接收机系统报告的CSI。然后报告的CSI被提供给控制器730并用来(1)判断要用于数据流的数据率和编码及调制方案,和(2)为TX数据处理器714和TX处理器720产生多种控制。
控制器730和770分别在发射机和接收机系统处指示操作。存储器732和772存储控制器730和770使用的程序代码和数据。存储器732和772根据簇位置、用户专用扰频序列存储导频图案,如果采用了扇区专用扰频序列和小区专用扰频序列,则也根据它们存储导频图案。在某些实施例中,多个导频图案被存储在每个存储器中,因此发射机可发射并且接收机可接收频率选择性导频图案和时间选择性导频图案。而且,可利用具有为时间选择性信道和频率选择性信道调整的簇的组合导频图案。这允许发射机根据参数,如随机序列,或响应来自基站的指令发射特定图案。
然后处理器730和770可选择导频图案,用户专用扰频序列,扇区专用扰频序列,和小区专用扰频序列中的哪个用在导频符号的传输中。
在接收机处,多种处理技术可用来处理NR个接收的信号,从而检测NT个传输的符号流。这些接收机处理技术可分成两个主要类(i)空间和空-时(space-time)接收机处理技术(这些技术也称为均衡技术);和(ii)“连续迫零(nulling)/均衡干扰消除”接收机处理技术(该技术也称为“连续干扰消除”或“连续消除(Successive cancellation”接收机处理技术)
虽然图7示出MIMO系统,同一系统可被应用至多输入单输出系统,这里多个发射天线,如基站上的天线发射一个或多个符号流至单个天线设备,如移动台。而且,单输出单输入天线系统可以如参考图7描述的方式相同的方式被利用。
参考图8,其示出按照实施例的导频符号产生方法的流程图。在方框800,选择多个导频符号簇在跳频区中从移动台传输。这些导频符号簇可全部被排列用于在频率选择性信道(图3A),时间选择性信道(图3B)中的传输,或是部分的簇的组合被排列用于在频率选择性信道和时间选择性信道中的传输。
一旦选择导频符号簇,就判断是否其中移动台正在通信的基站簇支持或正与多个移动台通信,方框802。该判断可基于其中有移动台的网络的先验知识。可替换地,可从扇区为基站传输信息作为其导频信息或广播消息。
如果簇不支持通信,或当前没有与多个移动台通信,那么标量函数可应用至对移动台正与其通信的簇唯一的导频符号,方框804。在实施例中,每个扇区的标量函数可存储在移动台中并可根据作为导频信息或广播消息一部分的扇区识别信号而被利用。
如果簇支持与多个移动台的通信,那么标量函数被应用至对移动台唯一的导频符号,方框806。在某些实施例中,每个移动台的标量函数可基于其唯一识别符,该识别符用于注册或在制造时被提供给设备。
在对移动台正在与其通信的扇区或移动台自身唯一的标量函数被应用至导频符号后,另一标量函数的序列被应用至导频符号,方框808。该标量函数的序列与其中移动台正在通信的小区相关。如果每个小区不是被具体分配给是移动台已知的或由移动台提供的标量函数,该标量函数可以在时间上变化。在该操作后,导频符号可从移动台传输到基站。
参考图8描述的标量函数,在实施例中,其可涉及构成导频符号的每个采样的相移。如参考图4A,4B,5和6的描述,选择标量函数以便导频符号的每个簇与来自其他导频符号簇中同一移动台的导频符号集正交,以及与基站的同一扇区其他移动台的同一和其他导频簇中的集合正交。
此外,参考图8描述的方框每个都可以实现为在计算机可读介质,如存储器上的一个或多个指令,这是通过处理器,控制器,或其他电子电路执行的。
参考图9,其示出按照实施例改变导频符号图案的方法的流程图。在方框900获得关于信道条件的信息。该信息可包括在基站的一个或多个扇区中的SNR比率、在基站处的信道选择性、所需的业务类型、基站被优化的行人或车辆、延迟扩展、或其他信道参数。进一步,信息可与时间周期相关,可以是对基站或基站网络常规维护操作的一部分,也可以基于基站或基站网络增加的负载,或其他时间。
分析信息从而判断扇区或基站的信道条件,方框902。该分析可以是关于信道是否是频率选择、时间选择,或两者组合的判断。然后该分析被用来判断从移动台传输的导频符号图案,该移动台与扇区或基站通信,方框904。这些导频符号簇可被全部排列以用于频率选择性信道(图3A),时间选择性信道(图3B)中的传输,或是部分簇的组合被排列以用于频率选择性信道和时间选择性信道中的传输。然后所选择的特定导频图案可被所有移动台使用,这些移动台与基站或扇区通信直到为基站或扇区再次执行诊断。
为了在与基站或基站扇区通信的移动台处执行特定的导频图案,可从基站或扇区发送指令至移动台作为初始化或安装程序的一部分。在某些实施例中,导频图案,用户专用扰频序列,扇区专用扰频序列,和/或小区专用扰频序列中哪个被利用的信息可在一个或多个数据包的包头中传输,该数据包是以规则的间隔或在初始化或安装过程中从基站传输到移动台的。
应该注意,分析可用来判断要在每个导频符号簇中传输的导频符号的数目和导频符号的分组。而且,每个参考图9描述的方框都可以被实现为如存储器或可拆除介质的计算机可读介质上的一个或多个指令,这是通过处理器,控制器,或其他电子电路执行。
这里描述的技术可通过多种方式执行。例如,这些技术可以硬件,软件,或它们的组合来实现。对于硬件实现,基站或移动台内的处理单元可在一个或多个专用集成电路(ASIC),数据信号处理器(DSP),数字信号处理设备(DSPD),可编程逻辑设备(PLD),现场可编程门阵列(FPGA),处理器,控制器,微控制器,微处理器,其他设计来执行这里所述功能的电子单元内实现,或它们的组合内实现。
对于软件实现,这里描述的技术可以被实现为执行此处所述功能的模块(如,程序,功能等)。软件代码可被存储在存储器单元中并由处理器执行。存储器单元可在处理器内或处理器外部执行,该情形中处理器可通信地经本领域公知的多种装置与处理器耦合。
这里所公开的实施例前面的描述是提供给本领域技术人员,使得他们能够利用或使用本发明。对于本领域技术人员来说,这些实施例的多种不偏离本发明精神和范畴的修改是显然的。因此,本发明不局限于这些实施例,而是与这里揭示的原理和新颖特征的最广泛的范围一致。
Claims (63)
1.一种无线通信设备,其包括:
至少一个天线;
存储器,其存储将从无线通信设备传输的导频符号的图案和多个标量函数;以及
处理器,其与至少一个天线和存储器连接,所述处理器使包括所述导频符号的采样与一组多个标量函数在所述导频符号从天线传输之前相乘。
2.如权利要求1所述的无线通信设备,其中所述存储器存储另一类多个标量函数,且其中所述处理器使采样与所述一组多个标量函数和一组另一类多个标量函数相乘。
3.如权利要求2所述的无线通信设备,其中所述另一类多个标量函数包括标量函数的矢量,且其中每个矢量与每个其他矢量正交。
4.如权利要求1所述的无线通信设备,其中所述多个标量函数包括标量函数的矢量,且其中每个矢量与每个其他矢量正交。
5.如权利要求1所述的无线通信设备,其中所述多个导频图案包括多个导频符号簇。
6.如权利要求5所述的无线通信设备,其中所述无线通信设备使用在最大频率和最小频率之间的频率范围内的多个频率子载波传输信号,且其中所述导频符号簇每个都包括多个导频符号,以使所述多个簇中每个簇的多个导频符号中的至少一个是通过使用不同于所述最大频率或所述最小频率的频率子载波而被传输的。
7.如权利要求6所述的无线通信设备,其中所述处理器改变第一时间周期和第二时间周期之间的频率范围,以使用于第一时间周期的频率范围内没有频率处在用于第二时间周期的频率范围内。
8.如权利要求5所述的无线通信设备,其中所述无线通信设备使用第一符号周期和最后的符号周期之间的多个邻近符号周期传输信号,且其中所述导频符号簇每个都包括多个导频符号,以使所述多个簇中每个簇的多个导频符号中仅一个导频符号是在第一符号周期或最后的符号周期中被传输。
9.如权利要求1所述的无线通信设备,其中所述多个导频符号包括多个时间选择性导频符号簇和频率选择性导频符号簇。
10.如权利要求1所述的无线通信设备,其中多个标量倍数的每一个都由每个符号的每个采样的相移构成。
11.如权利要求1所述的无线通信设备,其中所述多个标量函数包括标量函数的矢量,且其中每个矢量与每个其他矢量是拟正交的。
12.如权利要求1所述的无线通信设备,其中处理器利用离散傅立叶变换将标量函数的矢量与导频符号相乘。
13.一种无线通信方法,包括:
产生要从无线通信设备传输的多个导频符号;和
将多个标量函数中的一个应用至多个导频符号中的每一个。
14.如权利要求13所述的方法,其中所述多个标量函数被按矢量分组,且其中每个矢量与每个其他矢量正交。
15.如权利要求13所述的方法,其中应用操作包括根据所述标量函数对包括每个导频符号的每个采样进行移相。
16.如权利要求13所述的方法,还包括将另一类多个标量函数中的另一个标量函数应用至所述多个导频符号中的每一个。
17.如权利要求16所述的方法,其中应用另一个标量函数包括随时间改变应用到多个导频符号中的导频符号上的另一个标量函数。
18.如权利要求13所述的方法,其中所述多个导频符号是利用多个在最大频率和最小频率之间的子载波而被传输的,所述方法还包括
将所述多个导频符号分组为簇;和
给每个簇的每个导频符号分配传输频率,以使每个簇的至少一个导频符号被分配不同于最大频率和最小频率的子载波。
19.如权利要求13所述的方法,其中所述多个标量函数包括对无线通信设备唯一的标量函数。
20.如权利要求13所述的方法,其中所述多个标量函数包括对与所述无线通信设备通信的基站的扇区唯一的标量函数。
21.如权利要求13所述的方法,其中所述多个标量函数包括标量函数的矢量,且其中每个矢量与每个其他矢量是拟正交的。
22.如权利要求13所述的方法,其中应用所述多个标量函数包括在应用所述标量函数时利用离散傅立叶变换。
23.一种无线通信的方法,其包括:
将第一多个导频符号分组为多个簇;
在第一无线通信设备处,将第一多个标量函数应用至第一多个导频符号;
在多个时间间隔期间和以多个频率从所述第一无线通信设备传输所述多个导频符号;
将第二多个导频符号分组为多个簇;
在第二无线通信设备处,将不同于所述第一多个标量函数的第二多个标量函数应用至第二多个导频符号,其中所述多个第一导频符号的每个簇与所述多个第一导频符号和所述多个第二导频符号的每个其他簇是正交的;以及
在与所述多个第一导频符号相同的多个时间间隔期间和以与所述多个第一导频符号相同的多个频率,从所述第二无线通信设备传输所述第二多个导频符号。
24.如权利要求23所述的方法,其中所述多个导频符号是利用最大频率和最小频率之间的多个子载波而被传输的,且其中从所述第一无线通信设备的传输包括传输所述第一多个导频符号的每个簇,以使每个簇的至少一个导频符号被分配不同于最大频率和最小频率的子载波。
25.如权利要求23所述的方法,其中所述最大频率和所述最小频率在第一时间周期和第二时间周期之间改变,以使在用于第一时间周期的所述最小频率和最大频率之间没有频率处在用于第二时间周期的最小频率和最大频率之间。
26.如权利要求23所述的方法,其中所述多个导频符号是在第一符号周期和最后的符号周期之间的多个邻近符号周期中被传输的,且其中每个导频符号组都包括多个导频符号,以使每个组的多个导频符号中仅一个导频符号是在第一符号周期或最后的符号周期中被传输的。
27.如权利要求23所述的方法,还包括将另一类多个标量函数中的另一个标量函数应用至多个第一导频符号中的每个第一导频符号。
28.如权利要求27所述的方法,其中应用另一个标量函数包括随时间改变应用到所述多个第一导频符号中的每个导频符号的所述另一个标量函数。
29.如权利要求28所述的方法,还包括基于基站的扇区选择第一多个标量函数,其中所述第一无线通信设备传输信号至所述基站。
30.如权利要求28所述的方法,其中所述第一多个标量函数对所述第一无线通信设备是唯一的。
31.如权利要求23所述的方法,其中所述第一多个标量函数包括标量函数的矢量,且其中每个矢量与每个其他矢量是拟正交的。
32.如权利要求23所述的方法,其中在第一无线通信设备处,应用第一多个标量函数包括在应用所述第一多个标量函数时利用离散傅立叶变换。
33.一种无线通信设备,其包括:
多个天线;
存储器,其存储多个导频图案,每个导频图案包括多个簇,每个簇包括多个导频符号,同一导频图案的多个簇中的每个簇与同一导频图案的多个簇中的每个其他簇正交;以及
处理器,其与所述多个天线和所述存储器连接,所述处理器利用所述多个导频图案中的一个导频图案,从而解码在所述多个天线处从多个无线设备接收的多个导频符号组。
34.如权利要求33所述的无线通信设备,其中所述多个导频图案包括至少一个时间选择性导频图案和至少一个频率选择性导频图案。
35.如权利要求33所述的无线通信设备,其中所述存储器进一步存储与多个序列中每个其他序列正交的多个序列,且其中所述处理器选择性地指示导频图案的导频符号与多个序列中的一些序列在解码所述导频符号之前相乘。
36.如权利要求33所述的无线通信设备,其中所述存储器进一步存储另一类多个序列,且其中所述处理器选择性指示导频图案的导频符号与多个序列中的一些序列及另一类多个序列中的一些序列在解码所述导频符号之前相乘。
37.如权利要求36所述的无线通信设备,其中所述处理器产生要从多个天线中的至少一个天线传输的指令,该指令规定要被传输到所述无线通信设备的多个导频图案中的导频图案。
38.如权利要求33所述的无线通信设备,其中每个导频符号图案的每个导频符号被分配给最大频率和最小频率之间的频率范围内的频率,且其中多个簇中的每个簇的多个导频符号中的至少一个导频符号被分配给不同于所述最大频率或所述最小频率的频率子载波。
39.如权利要求33所述的无线通信设备,其中每个导频符号图案的每个导频符号被分配给第一符号周期和最后的符号周期之间的多个邻近符号周期,且其中多个簇中的每个簇的多个导频符号中仅一个导频符号被分配给第一符号周期或最后的符号周期。
40.如权利要求33所述的无线通信设备,其中每个簇的每个导频符号被分配以利用一组邻近频率子载波中的频率子载波而被传输,所述一组邻近频率子载波处在最小频率到最大频率的范围内,且所述传输发生在从第一符号周期到最后的符号周期的范围内的一组邻近符号周期的一个符号周期中,且其中每个簇中仅一个导频符号被分配以最大频率或最小频率作为其传输频率子载波,或分配以第一符号周期或最后的符号周期作为其传输符号周期。
41.一种无线通信设备,其包括:
多个天线;
存储器,其存储多个导频图案,每个导频图案包括多个簇,同一导频图案中的多个簇中的每个簇与所述同一导频图案的所述多个簇中的每个其他簇正交;以及
处理器,其与所述多个天线和所述存储器连接,所述处理器根据所述多个导频图案中的一个导频图案,使多个导频符号从多个天线中的至少两个天线被传输。
42.如权利要求41所述的无线通信设备,其中所述处理器根据所述多个导频图案中的不同于一个导频图案的另一个导频图案,使多个导频符号从多个天线中的至少两个天线被传输。
43.如权利要求41所述的无线通信设备,其中所述多个导频图案包括至少一个时间选择性导频图案和至少一个频率选择性导频图案。
44.如权利要求41所述的无线通信设备,其中所述存储器进一步存储与多个序列中的每个其他序列正交的多个序列,且其中所述处理器根据一个导频图案选择性地指示所述导频图案的导频符号与多个序列中的一些序列在传输多个导频符号之前相乘。
45.如权利要求41所述的无线通信设备,其中所述存储器进一步存储另一类多个序列,且其中所述处理器根据一个导频图案选择性地指示导频图案的导频符号与多个序列中的一些序列及另一类多个序列中的一些序列在传输所述多个导频符号之前相乘。
46.如权利要求45所述的无线通信设备,其中所述处理器产生要从多个天线中的至少一个天线中被传输的指令,其规定要被传输到所述无线通信设备的多个导频图案中的导频图案。
47.如权利要求41所述的无线通信设备,其中每个导频符号图案的每个导频符号被分配给最大频率和最小频率之间的频率范围内的频率,且其中多个簇中每个簇的多个导频符号中的至少一个导频符号被分配给不同于所述最大频率或所述最小频率的频率子载波。
48.如权利要求41所述的无线通信设备,其中每个导频符号图案的每个导频符号被分配给处在第一符号周期和最后的符号周期之间的多个邻近符号周期中的一个符号周期,且其中多个簇中每个簇的多个导频符号中仅一个导频符号被分配给所述第一符号周期或所述最后的符号周期。
49.如权利要求41所述的无线通信设备,其中每个簇的每个导频符号被分配以利用一组邻近频率子载波中的频率子载波而被传输,所述一组邻近频率子载波处在最小频率到最大频率的范围内,且所述传输发生在从第一符号周期到最后的符号周期的范围内的一组邻近符号周期的一个符号周期中,且其中每个簇中仅一个导频符号被分配以最大频率或最小频率作为其传输频率子载波,或分配以第一符号周期或最后的符号周期作为其传输符号周期。
50.一种无线通信设备,其包括:
用于将多个导频符号设置在多个簇中的装置;以及
用于在传输所述导频符号之前将多个标量函数中的一个应用至所述多个导频符号中的每个导频符号的装置。
51.如权利要求50所述的无线通信设备,其中用于应用的装置包括用于应用所述多个标量函数以使导频符号的每个簇与导频符号的每个其他簇正交的装置。
52.如权利要求50所述的无线通信设备,进一步包括用于将另一类多个标量函数的另一个标量函数应用至所述多个导频符号的每个导频符号的装置。
53.如权利要求50所述的无线通信设备,其中应用另一个标量函数包括随时间改变应用到所述多个导频符号的一个导频符号的另一个标量函数。
54.如权利要求50所述的无线通信设备,其中所述多个标量函数包括对所述无线通信设备唯一的标量函数。
55.如权利要求50所述的无线通信设备,其中所述多个标量函数包括对与所述无线通信设备通信的基站的扇区唯一的标量函数。
56.如权利要求50所述的无线通信设备,其中所述多个导频符号是使用在最大频率和最小频率之间的多个子载波而被传输的,且其中用于设置的装置包括用于给每个簇的每个导频符号分配传输频率,以使每个簇的至少一个导频符号被分配给不同于所述最大频率和所述最小频率的子载波的装置。
57.如权利要求50所述的无线通信设备,其中所述多个导频符号是在第一符号周期和最后的符号周期之间的多个邻近符号周期中被传输的,且其中用于设置的装置包括用于给每个导频符号分配符号周期,以使每个簇中仅一个导频符号是在所述第一符号周期或所述最后的符号周期中被传输的装置。
58.一种无线通信设备,其包括:
用于将第一多个导频符号分组为多个簇的装置;
用于在第一无线通信设备处,将第一多个标量函数应用至第一多个导频符号的装置;
用于在多个时间间隔期间和以多个频率从所述第一无线通信设备传输所述多个导频符号的装置;
用于将第二多个导频符号分组为多个簇的装置;
用于在第二无线通信设备处,将不同于所述第一多个标量函数的第二多个标量函数应用至第二多个导频符号的装置,其中所述多个第一导频符号的每个簇与所述多个第一导频符号和所述多个第二导频符号的每个其他簇是正交的;以及
用于在与所述多个第一导频符号相同的多个时间间隔期间和以与所述多个第一导频符号相同的多个频率,从所述第二无线通信设备传输所述第二多个导频符号的装置。
59.如权利要求58所述无线通信设备,其中多个导频符号是利用最大频率和最小频率之间的多个子载波而被传输的,且其中用于从所述第一无线通信设备传输的装置包括用于传输所述第一多个导频符号的每个簇,以使每个簇的至少一个导频符号被分配给不同于所述最大频率和所述最小频率的子载波的装置。
60.如权利要求59所述的无线通信设备,其中用于传输的装置改变在第一时间周期和第二时间周期之间改变的最大频率和最小频率,以使用于所述第一时间周期的最小频率和最大频率之间没有频率处在用于所述第二时间周期的最小频率和最大频率之间。
61.如权利要求58所述的无线通信设备,其中多个导频符号是在第一符号周期和最后的符号周期之间的多个邻近符号周期中被传输的,且其中用于分组的装置包括用于将多个导频符号分组,以使每个组中的多个导频符号中仅一个导频符号是在第一符号周期或最后的符号周期中被传输的装置。
62.如权利要求58所述的无线通信设备,还包括用于将另一类多个标量函数的另一个标量函数应用至多个第一导频符号中的每个第一导频符号的装置。
63.如权利要求58所述的无线通信设备,其中用于应用另一个标量函数的装置包括用于随时间改变应用至多个第一导频符号中的每个第一导频符号的另一个标量函数的装置。
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KR200471652Y1 (ko) | 2013-08-07 | 2014-03-12 | 남경탁 | 의자 일체형 가구 |
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2005
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Cited By (9)
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CN101610585B (zh) * | 2008-06-11 | 2012-04-18 | 财团法人工业技术研究院 | 以参考信号为基础用于无线通信装置的方法及该无线装置 |
WO2010069111A1 (zh) * | 2008-12-18 | 2010-06-24 | 中兴通讯股份有限公司 | 一种实现毫微微小区导频分配的方法、基站及移动终端 |
CN101867446A (zh) * | 2009-04-15 | 2010-10-20 | Lg电子株式会社 | 传送接收广播信号的方法及传送接收广播信号设备 |
CN101867446B (zh) * | 2009-04-15 | 2016-08-03 | Lg电子株式会社 | 传送接收广播信号的方法及传送接收广播信号设备 |
WO2013178084A1 (zh) * | 2012-05-31 | 2013-12-05 | 华为技术有限公司 | 一种无线通信方法、基站及用户设备 |
CN109964512A (zh) * | 2016-11-16 | 2019-07-02 | 杜塞尔多夫华为技术有限公司 | 具有不等功率分配的复用数据序列的无线设备和无线小区 |
CN109964512B (zh) * | 2016-11-16 | 2022-03-25 | 杜塞尔多夫华为技术有限公司 | 具有不等功率分配的复用数据序列的无线设备和无线小区 |
CN113330720A (zh) * | 2018-10-31 | 2021-08-31 | 弗劳恩霍夫应用研究促进协会 | 简易接收器上导频序列的检测 |
WO2023093613A1 (zh) * | 2021-11-29 | 2023-06-01 | 中兴通讯股份有限公司 | 导频图案生成方法、装置、电子设备及存储介质 |
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BRPI0607786A2 (pt) | 2009-06-13 |
TW200707997A (en) | 2007-02-16 |
RU2395919C2 (ru) | 2010-07-27 |
CN101167321B (zh) | 2013-06-05 |
HUE040663T2 (hu) | 2019-03-28 |
KR100925094B1 (ko) | 2009-11-05 |
ES2694680T3 (es) | 2018-12-26 |
WO2006110259A1 (en) | 2006-10-19 |
KR100961586B1 (ko) | 2010-06-04 |
US20060209670A1 (en) | 2006-09-21 |
CA2601191A1 (en) | 2006-10-19 |
EP2259524B1 (en) | 2019-12-04 |
EP2259524A1 (en) | 2010-12-08 |
EP1859592B1 (en) | 2018-09-12 |
RU2007138505A (ru) | 2009-04-27 |
JP5166236B2 (ja) | 2013-03-21 |
EP1859592A1 (en) | 2007-11-28 |
KR20070110931A (ko) | 2007-11-20 |
KR20090096558A (ko) | 2009-09-10 |
RU2010121653A (ru) | 2011-12-10 |
JP2008533928A (ja) | 2008-08-21 |
US9143305B2 (en) | 2015-09-22 |
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