CN101997814B - 使用多种码元长度的多载波传输 - Google Patents
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Abstract
***话务可被安排成不同的分类(例如,控制数据、用户数据和导频数据)。对于每一个分类,一个或多个合适大小的OFDM码元被基于用于该分类中的话务的希望的有效负载大小而选择使用。例如,控制数据可使用第一大小的OFDM码元发射,用户数据可使用第一和第二大小的OFDM码元发射,而导频数据可使用第三或者第一大小的OFDM码元发射。在一示例设计中,小OFDM码元被用于发送控制数据的导频和传输信道,而大OFDM码元和小OFDM码元被用于发送用户数据的传输信道。
Description
本申请是申请号为200380105059.7、国际申请日为2003年10月27日、发明名称为“使用多种码元长度的多载波传输”的发明专利申请的分案申请。
本申请要求下列优先权:美国专利申请序列号No.60/421/309号临时申请,题为“MIMO WLAN System”,提交于2002年10月25日,以及美国专利申请序列号No.60/438,601,题为“Pilot Transmission Schemes for WirelessMulti-Carrier Communication System”,提交于2003年1月7日,两者都转让给本申请的受让人并通过引用将它们所有的目的完整地结合于此。
背景
I.领域
本申请一般涉及数据通信,更具体地说,涉及正交频分复用(OFDM)通信***以及用于提供OFDM码元符号大小以增加无线效率的技术。
II.背景
无线通信***广泛使用以提供各种类型的通信服务,例如语音、分组数据等等。这些***可使用OFDM,其是一种能够为一些无线环境提供高性能的调制技术。OFDM将整个***带宽有效地分割成数个(Ns个)正交的子频带,通常也称为频调、区段以及频率子信道。使用OFDM,每一个子频带与一不同的可能调制了数据的载波相关。
在OFDM中,一信息比特流被转换成一系列频域调制码元。一调制码元可在每个OFDM码元周期(在下面定义)中在Ns个子频带中的每一个上发射。将要在每个OFDM码元周期中在Ns个子频带上被发射的调制码元被使用快速傅立叶反变换(IFFT)变换到时域以获得一包含Ns个样本的“变换的”码元。至一Ns点IFFT的输入是Ns个频域值而IFFT的输出是Ns个时域样本。子频带的数量由IFFT的大小确定。增加IFFT的大小增加了子频带的数量也增加了每个变换的码元的样本的数量,这相应地增加了要求用于发射该码元的时间。
为了对抗用于数据传输的无线信道中的频率选择性衰减(下面描述),每一个变换的码元的一部分通常会在传输前被重复。重复的部分通常被称为循环前缀,且具有Ncp个样本的长度。循环前缀的长度通常是基于***的延迟扩展选择。一OFDM码元由一转换的码元和其循环前缀组成。每一个OFDM码元包含Ns+Ncp个样本并具有Ns+Ncp个样本周期的持续时间,这是一个OFDM码元周期。
和OFDM码元大小相关的循环前缀的大小会对OFDM***的效率产生很大的影响。循环前缀必须与每一个OFDM码元一起被发射以简化在一多路径环境中的接收机处理,但是循环前缀不携载额外的信息。循环前缀可被视为在多路径环境中操作时必须被浪费的带宽。以这种方式被浪费的带宽的比例可以使用下式计算:例如,如果Ncp是16个样本而Ns是64个样本,则20%的带宽被损失用于循环前缀。这个百分比可通过使用Ns相对大的值来减小。不幸的是,使用Ns相对大的值同样会导致低效率,特别是将要被发射的信息单元或者分组的大小比OFDM码元的容量小得多的时候。例如,如果每个OFDM码元可携载480个信息比特,但是大多数一般分组包含96比特,则分组效率将是很差的而在发射该一般分组时OFDM码元的大多数容量被浪费。
正交频分多址(OFDMA)由于通过使用大OFDM码元而导致容量扩充来改善低效率。对于OFDMA,多个用户使用频域复用来共享大OFDM码元。这是通过保留一组用于信令的子频带并分配不同的不相交子频带组至不同的用户来实现。然而,使用OFDMA的数据传输可能由于各种因素而变得复杂,例如不同的功率要求、传播延迟、多普勒频移、以及/或者共享该大OFDM码元的不同用户的定时。
现存的OFDM***通常选择一单一的OFDM码元大小,其是多种目的的折衷,这些目的可包括最小化循环前缀开销以及最大化分组效率。使用该单一OFDM码元大小导致在发射可变大小的分组时由于容量的扩展而引起的低效率。因此在本领域中需要一种OFDM***,其在发射可变大小的分组时能有效地操作。
发明内容
此处提供了使用不同大小的OFDM码元来实现OFDM***的更高的效率的技术。这些技术可最小化循环前缀开销和最大化分组效率两方面的要求。OFDM码元大小可基于准备在一OFDM***中准备发射的负载的不同类型所希望的大小而被选择。***话务可被安排至不同的分类中。对于每个分类,一个或多个合适大小的OFDM码元可基于该分类中的话务所期望有效负载大小而被选择使用。
例如,***数据可被安排至控制数据、用户数据、以及导频数据。控制数据可使用第一大小的OFDM码元发射,用户数据可使用第二大小的OFDM码元和第一大小的OFDM码元发射,而导频数据可使用第三大小(或者第一大小)的OFDM码元发射。用户数据还可以被安排到子分类中,例如语音数据、分组数据、消息传递数据等等。一特定的OFDM码元大小可之后被选择用于用户数据的每一个子分类。作为替代或者附加,用于每个用户的数据可被使用一具有选择用于该用户的大小的OFDM码元发射。为了改善分组效率,不同大小的OFDM码元可被用于一给定的用户数据分组以更好地匹配OFDM码元的容量至分组有效负载。
一般,任何数量的OFDM码元大小可被用于一OFDM***,而任何特定OFDM码元大小可被选择使用。在一个示例设计中,两个OFDM码元大小的组合被使用以最大化分组效率。在该示例设计中,一小的或短的OFDM码元大小(例如,具有64子频带)被用于导频和控制数据。用户数据可被在零个或多个具有大的或者长的OFDM码元大小(例如,具有256子频带)的OFDM码元中以及在零个或多个具有小的OFDM码元大小的OFDM码元中发送,这是根据有效负载的大小。
在发射机和接收机处的处理(例如,编码、交错、码元映射、以及空间处理)可以一种考虑到不同大小的OFDM码元的使用的形式被执行,如下面所描述的。本发明的各种方面和实施例也在下面详细描述。
附图简述
本发明的特征、性质和优势将从下面结合附图的详细描述中变得更加明显,其中相同的附图标记始终表示相同的特征,其中:
图1示出一OFDM调制器的框图;
图2示不同大小的OFDM码元以及由于循环前缀的开销;
图3A和3B示出使用不同大小的OFDM码元来发射不同类型的数据;
图4示出具有S级的IFFT单元,用于产生不同大小的OFDM码元;
图5示出一示例MIMO-OFDM***;
图6示出用于一TDD MIMO-OFDM***的帧结构;
图7示出用于数据分组和PHY帧的结构;
图8示出一接入点和两个用户终端的框图;
图9A示出一可被用于该接入点和该用户终端的发射机的框图;以及
图9B示出该发射机单元中的调制器的框图;
详细描述
词语“示例”在此处被用于表示“作为例子、示例或者说明”。任何在此处被作为“示例”描述的实施例或者设计并不需要被描述为相对于其他的实施例是优选的或者具有优势的。
图1示出可用在一OFDM***中的OFDM调制器100的框图。将要被发射的数据(即,信息比特)通常首先在一编码器(没有示出)中使用一特定的编码方法编码以产生编码比特。例如,编码器(没有示出)可使用一前向差错校正(FEC)码,诸如分组码、卷积码或者turbo码。编码比特接下来被分组到B比特二进制值中,其中B≥1。每一个B比特值接下来被基于一特定调制方案(例如,M-PSK或者M-QAM,其中M=2B)映射到一指定调制码元。每一个调制码元是信号星座图中对应于用于该调制码元的调制方案的一个复数值。
对于每一个OFDM码元周期,一调制码元可在每一个用于数据传输的子频带上发射,且对于每一个没有使用的子频带提供一为零的信号值。快速傅立叶变换(IFFT)单元110使用快速傅立叶反变换(IFFT)将每个OFDM码元周期内的所有Ns个子频带的Ns个调制码元和零转换到时域,以获得包含Ns个样本的变换的码元。
一循环前缀产生器120接下来重复每一个变换码元的以部分一获得一对应的包含Ns+Ncp个样本的OFDM码元。循环前缀被用于对抗频率选择性衰落(即,在整个***带宽上变化的频率响应),该衰减是由于***的延迟扩展而引起。对于发射机发射的信号,在接收机处最早到达和最晚到达的信号实例之间的***延迟扩展是不同的。***的延迟扩展是对于所有***中的发射机和接收机的期望最差情况的延迟扩展。频率选择性衰落导致码间串扰(ISI),这是一种在所接收的信号中的每一个码元起到对该接收信号中的后续码元的失真作用的现象。ISI失真通过影响正确检测所接收的信号的能力而降低性能。为了有效地对抗ISI,循环前缀的长度通常基于***的延迟扩展而选择,因此循环前缀包含了所有多路径能量中的一显著部分。循环前缀对于每一个OFDM码元表现为一固定Ncp个样本的开销。
图2说明了不同大小的OFDM码元,包括由于循环前缀的固定开销。对于给定的***带宽W MHz,OFDM码元的大小或者持续时间是根据子频带的数量。如果***带宽通过使用一N点IFFT被分割成N个子频带,则结果变换码元包含N个样本并跨越N个样本周期或者N/W微妙。如图2所示的,***带宽也可通过使用2N点IFFT被分割成2N个子频带。在这种情况下,结果变换码元可包含2N个样本,跨越2N个样本周期,并具有大约两倍于具有N个样本的变换的码元的数据携载能力。类似地,图2还示出了***带宽怎样可使用4N点IFFT被分割成4N个子频带。结果变换的码元可包含4N个样本并具有大约四倍于具有N个样本的变换的码元的数据携载能力。
如图2所示的,由于循环前缀是一个固定的开销,当码元的大小增加时该开销变成OFDM码元中的一个小的百分比。观察另一个方法,仅仅一个循环前缀需要用于4N大小的变换的码元,而4个循环前缀需要用于等价的4个N大小的变换的码元。循环前缀的开销的量可通过使用4N大小的大OFDM码元而降低75%。(术语“大”和“长”在此处对于OFDM码元可互换地使用,而术语“小”和“短”也可互换地使用)。图2表示效率改善(从循环前缀观点看)可通过使用具有最大可能大小的OFDM码元而获得。可使用的最大大小的OFDM码元通常由无线信道的相干(coherence)时间限制,其是无线信道基本保持恒定的时间。
最大可能OFDM码元的使用可能从其他观点看是低效率的。具体而言,如果OFDM码元的数据携载容量比将要发送的有效负载的容量大的多,则OFDM码元的剩下的多余容量将变得没有用处。该OFDM码元的多余容量表示了低效率。如果OFDM码元太大,则由于多余容量造成的低效率可能比由于循环前缀造成低效率更大。
在一示出的OFDM***中,两种类型的低效率都通过使用不同大小的OFDM码元而最小化。用于发射一数据单元的OFDM码元大小可从一组可用的OFDM码元大小中选择,其相应地可基于将要在OFDM***中发射的不同类型的负载所希望的大小而选择。***话务可被安排至不同的分类中。对于每一个分类,一个或多个合适大小的OFDM码元可基于该分类中的话务的期望有效负载大小和可能的其他考虑(例如,实现复杂度)而被选择使用。一OFDM码元可被看作用于发送数据的矩形波串(boxcar)。一个或多个合适大小的矩形波串可根据该分类将要发送的数据量而被选择用于每一个数据分类。一数据单元可使用多个具有固定大小或者可变大小的矩形波串而发送。例如,如果一数据单元消耗2.1倍的“大”矩形波串的容量,则将使用两个“大”矩形波串和一个“小”矩形波串发送。
作为一例,***话务可被分割成三个基本分类——控制数据、用户数据、和导频数据。控制数据通常组成全部***话务的一小部分(例如,小于10%)并通常在小块中被发送。用户数据组成***话务的主要部分。为了最小化循环前缀开销并最大化分组效率,一短OFDM码元可被用于发送控制数据和导频,而长OFDM码元和短OFDM码元的组合可被用于发送用户数据。
图3A示出使用不同大小的OFDM码元以在一OFDM***中发射不同类型的数据。为了简明,仅仅一个OFDM码元大小被用于图3A中的数据的每一个分类和类型。通常,任何数量的OFDM码元大小可被用于数据的每一个分类和类型。
如图3A中所示出的,导频数据可使用具有大小Nsa的OFDM码元发射,控制数据可使用具有大小Nsb的OFDM码元发射,而不同类型的用户数据(或者用于不同用户的数据)可使用具有大小Nbc至Nsq的OFDM码元发射。用户数据可进一步被安排成诸如语音数据、分组数据、消息传递数据等等的子分类中。一合适的OFDM码元大小接下来可被选择用于每一个用户数据的子分类。或者,每个用户的数据可使用具有用于该用户的合适大小的OFDM码元发射。用于特定用户的OFDM码元大小可基于各种考虑,诸如将要发射的数据的量、用于该用户的无线信道的相干时间等等而被选择。
一般而言,任何数量的OFDM码元大小可被用于OFDM***,而任何特定OFDM码元大小可被选择使用。通常,最小的OFDM码元大小由循环前缀开销指定而最大OFDM码元大小由无线信道的相干时间指定。对于实践的考虑,2的幂(例如,32、64、128、256、512等等)的OFDM码元大小通常会被选择使用,因为在时域和频域之间使用IFFT和快速傅立叶变换操作进行变换比较容易。
图3A示出以时分复用(TDM)方式在不同的时间分段内不同类型的数据的传输。每个帧(具有特定的持续时间)被分割成多个时间分段。每个时间分段可被用于发射特定类型的数据。不同类型的数据也可以其他的方式发射,且这是在本发明的范围之内。例如,导频和控制数据可在同一个时间分段内在不同的组的子频带上发射。如另一个例子,所有的数据可对于每个帧在一个时间分段内发射。
对于TDM帧结构,诸如在图3A中示出的,特定的用于每个时间分段的OFDM码元大小可通过各种方式确定。在一个实施例中,用于每个时间分段的OFDM码元大小是固定的并且为OFDM***中的发射机和接收机两者先验所知。在另一个实施例中,用于每个时间分段的OFDM码元大小是可配置的,并且例如,由发送用于每个帧的信令所指定。在另一个实施例中,用于一些时间分段的OFDM码元大小(例如,用于导频和控制数据)可以是固定的而用于其它时间分段的(例如,用户数据)的OFDM码元大小可以是可配置的。在后一种配置中,发射机可使用固定码元大小控制数据信道发射将要在后续的用户数据OFDM码元中使用的OFDM码元大小。
图3B示出使用两种不同的OFDM码元大小N和4N用于不同类型的数据。在该实施例中,每个帧被分割成三个时间分段用于导频、控制数据和用户数据。导频和控制数据使用大小为N的OFDM码元大小发射,而用户数据使用大小为4N的OFDM码元和大小为N的OFDM码元发射。一个或多个大小为N的OFDM码元可在导频和控制数据的每一个时间分段发射。零个或多个大小为4N的OFDM码元以及零个或多个大小为N的OFDM码元可在用户数据的时间分段发射。
图4示出能够产生不同大小的OFDM码元的可变大小IFFT单元400的一个实施例。IFFT单元400包括S级,其中S=log2Nmax,Nmax是将要产生的最大OFDM码元的大小。每个OFDM码元周期的调制码元被提供给一零***以及排序单元410,其对调制码元进行排序,例如以一比特反转(bit-reverse)顺序,并在产生较小的OFDM码元的时候***合适数量的零。单元410提供Nmax个排序的调制码元和零至第一蝶形级420a,其执行一组蝶形计算用于2点离散傅立叶反变换(IDFT)。从第一蝶形级420a的输出接下来由每一个后续的蝶形级420b至420s处理。每个蝶形级420使用一组用于该级的系数执行一组蝶形操作,如业内所知的。
从最后的蝶形级420s的输出被提供给一选择器单元430,其为每一个OFDM码元提供时域样本。为了执行Nmax点IFFT,所有的蝶形级被启用且Nmax个样本由选择器单元430提供。为了执行Nmax/2点IFFT,除了最后的蝶形级420s以外的所有蝶形级被启用且Nmax/2个样本由选择器单元430提供。为了执行Nmax/4点IFFT,除了最后的两个蝶形级420s和420r以外的所有蝶形步骤被启用且Nmax/4个样本由选择器单元430提供。一控制单元440接收用于当前OFDM码元周期的特定OFDM码元大小的指示并提供用于单元410和430以及蝶形级420的控制信号。
IFFT单元400可实现一时域抽选或者频域抽选IFFT算法。此外,IFFT单元400可实现基数为4或者基数为2的IFFT,尽管基数为4的IFFT可能更加有效。IFFT单元400可被设计为包括一个或多个蝶形计算单元。极限上,一个蝶形计算单元可以被用于一时间共享IFFT实现,而Nmax/基数个碟形计算单元可被用于完全平行IFFT计算。通常,所要求的蝶形计算单元的数量是由用于这些单元的时钟速度、OFDM码元速率、以及最大IFFT大小确定的。对于这些蝶形计算单元的正确的控制结合存储器管理允许不同大小的IFFT可使用单个的IFFT单元执行。
如上面的图1所描述的,循环前缀产生器120重复由选择器430输出的每一个变换的码元的一部分以为每一个OFDM码元提供一循环前缀。相同的循环前缀可被用于不同大小的OFDM码元并可基于如上所述的***延迟扩展而被选择。循环前缀的长度也可以是可配置的。例如,用于每个接收机的循环前缀长度可基于接收机的扩展延迟而被选择,其可以比***的扩展延迟短。配置的循环前缀长度可被发送到接收机或者通过其他方法使接收机知道。
不同大小的OFDM码元可被具有优势地用在各种类型的OFDM***中。例如,多个OFDM码元大小可被用于(1)使用单个天线用于发送和接收的单输入单输出OFDM***,(2)使用多个天线发送和使用单个天线接收的多输入单输出OFDM***,(3)使用单个天线发送和使用多个天线接收的多输入单输出OFDM***,以及(4)使用多个天线发送和接收的多输入多输出OFDM***(即,MIMO-OFDM***)。多个OFDM码元大小也可被用于(1)使用不同频带用于下行链路和上行链路的频分双工(FDD)OFDM***,以及(2)使用一个频带以时间共享的方式用于下行链路和上行链路两者的时分双工(TDD)OFDM***。
在一示例TDD MIM-OFDM***中使用不同大小的OFDM码元在下面描述。
I.TDD MIMO-OFDM***
图5示出具有多个支持用于数个用户终端(UT)520的接入点(AP)510的MIMO-OFDM***500。为了简明,仅仅两个接入点510a和510b在图5中被示出。接入点是一个用于与用户终端通信的固定站且也可被称为基站或者一些其他术语。一用户终端也可被称为一接入终端、一移动站、一用户装备(UE)、一无线设备、或者一些其他术语。用户终端520可分布在整个***中。每个用户终端可以是固定的或者移动的终端并可以与一个或者可能多个接入点在下行链路以及/或者上行链路上在任何给定的时刻通信。下行链路(即,前向链路)是指从接入点至用户终端的通信链路,而上行链路(即,反向链路)是指从用户终端至接入点的通信链路。
在图5中,接入点510a与用户终端520a至520f通信,而接入点510b与用户终端520f至520k通信。一***控制器530耦合至接入点510并可被设计为执行数个功能,诸如(1)协调并控制与之耦合的接入点,(2)在这些接入点之间路由数据,以及(3)接入并控制与由这些接入点服务的用户终端的通信。
图6示出可被用于MIMO-OFDM***500的示例帧结构600。数据传输发生在TDD帧的单元中,每一个跨越一特定的持续时间(例如,2毫秒)。每一个TDD帧被分割成下行链路阶段和上行链路阶段,且每一个下行链路或者上行链路阶段被进一步分割成多个分段用于多个传输信道。在图6所示的实施例中,下行链路传输信道包括广播信道(BCH)、前向链路控制信道(FCCH)、以及前向信道(FCH),而上行链路传输信道包括反向信道(RCH)和随机接入信道(RACH)。
在下行链路上,BCH分段600被用于发射一BCH协议数据单元(PDU)612,其包括信标导频部分614、MIMO导频部分616、以及BCH消息部分618。BCH消息携载该***中的用户的***参数。一FCCH分段620被用于发射一个FCCH PDU,其携载用于下行链路和上行链路资源的分配以及其他用于用户终端的信令。一FCH分段630被用于在下行链路上发射一个或多个FCH PDU 632。不同类型的FCH PDU可被定义。例如,一FCH PDU 632a包括导频部分634a(例如,操纵(steered)参考)以及数据分组部分636a。导频部分也成为“前导序列”。一FCH PDU 632b包括数据分组单个部分636b。不同类型的导频(信标导频、MIMO导频、以及操纵参数)在前面所提到的美国临时专利申请序列号No.60/421,309中描述。
在上行链路,一RCH分段640被用于在上行链路上发射一个或多个RCHPDU 642。不同类型的RCH PDU也可以被定义。例如,一RCH PDU 642a包括数据分组的单个部分646a。一RCH PDU 642b包括导频(例如,操纵参考)部分644b和数据分组部分646b。一RACH分组650被用户终端用于获取对***的接入并在上行链路上发送短消息。一RACH PDU 652可在RACH分段650中发送并包括一导频(例如,操纵参考)部分654和消息部分656。
在图6中部分和分段的持续时间没有按比例画出。在图6中所示的帧结构和传输信道在前述的美国临时专利申请序列号No.60/421,309中详细描述。
由于不同的传输信道可与不同类型的数据相关,一合适的OFDM码元大小可被选择用于每一个传输信道。如果大量数据希望在一给定的传输信道上发射,则大OFDM码元可被选择用于该传输信道。循环前缀将表现为大OFDM码元中的小的百分比,并将获得更高的效率。相反,如果少量的数据将在一给定的传输信道上发射,则小OFDM码元将被用于该传输信道。尽管循环前缀表现为OFDM码元中大的百分比,仍然可以通过减少多余容量来获得更高的效率。
因此,为了获得更高的效率,每个传输信道的OFDM码元可被选择以匹配将在该传输信道上发射的数据类型的期望有效负载大小。不同的OFDM码元大小可被用于不同的传输信道。此外,多个码元大小可被用于一给定的传输信道。例如,FCH和RCH的每个PDU类型可与用于该PDU类型的合适的OFDM码元大小相关。大OFDM码元可被用于大大小的FCH/RCH PDU类型,而小OFDM码元大小可被用于小大小FCH/RCH PDU类型。
为了简明,一示例设计在下面使用NS1=64的小OFDM码元大小和NS2=256的大OFDM码元大小描述。在该示例设计中,BCH、FCCH、以及RACH使用小OFDM码元,而FCH和RCH根据需要使用小和大OFDM码元两者。其他OFDM码元大小也可被用于该传输信道,且这是在本发明的范围之内。例如,NS3=128的大OFDM码元大小可作为替换或者被附加地用于FCH和RCH。
对于该示例设计,用于小OFDM码元的64个子频带被分配索引-32至+31。对于这64个子频带,48个子频带(例如,具有索引±{1,…,6,8,…20,22,…,26})被用于数据并被称为数据子频带,4个子频带(例如,具有索引±{7,21})被用于导频和可能的信令,DC子频带(具有索引0)没有被使用,而剩下的子频带也没有被使用并被用作守护子频带。该OFDM子频带结构在前述的美国临时专利申请序列号No.60/421,309中描述。
大OFDM码元的256个子频带被分配索引-128至+127。小OFDM码元的子频带可被映射至大OFDM码元的子频带上,基于下式:
l=4k+i 等式(1)
其中k是短OFDM码元中的子频带的索引(k=-32,…,+31);
i是具有i=0,1,2,3的索引偏移,以及
l是长OFDM码元中的子频带的索引(1=-128,…,+127)。
对于该示例设计,***带宽W=20MHz,对于BCH、FCCH和RACH的循环前缀是NCP1=16的样本,FCH和RCH的循环前缀是可配置为NCP2=8或者16。小OFDM码元被用于BCH、FCCH以及RACH将具有大小NOS1=80个样本或者4.0微秒。如果NCP2=16被选择使用,则被用于FCH和RCH的大OFDM码元会具有大小NOS2=272个样本或者13.6微秒。
对于该示例设计,BCH分段具有固定的80微秒的持续时间,而每一个剩下的分段具有可变的持续时间。对于TDD帧,每个在FCH和RCH上发送的PDU的开始相对于FCH和RCH分段的开始以及RACH分段的开始相对于TDD帧的开始在FCCH分段中被发送的FCCH消息中被提供。不同的OFDM码元大小与不同的码元持续时间相关。由于不同的OFDM码元大小可被用于不同的传输信道(且不同的OFDM码元大小也可被用于同一个传输信道),FCH和RCH PDU的偏移被指定合适的时间解析度。对于上述的示例设计,时间解析度可以是循环前缀的长度800纳秒。对于2毫秒的TDD帧,一12比特的值可被用于指示每一个FCH/RCH PDU的开始。
图7示出一可在一FCH或者RCH上的FCH或者RCH PDU中发送的数据分组636x的示例结构。该数据分组使用整数个PHY帧710发送。每一个PHY帧710包括携载PHY帧的数据的有效负载字段722、包括用于PHY帧的CRC值的CRC字段724、以及包括一组用于刷新编码器的零的尾部比特字段726。数据分组的第一PHY帧710a还包括头部字段720、其指示消息类型和持续时间。数据分组的最后一个PHY帧710m还包括填充比特字段728,其包含在有效负载尾部的零填充比特以填充最后的PHY帧。该PHY帧结构在前述的美国临时专利申请序列号No.60/421,309中详细描述。如果一个天线被用于数据传输,则每个PHY帧710可被处理以获得一个OFDM码元750。
相同的PHY帧结构可被用于在BCH或者FCCH上发送的消息。具体地说,一BCH/FCCH消息可使用整数个PHY帧发送,其中的每一个可被处理以获得一OFDM码元。多个OFDM码元可被发射用于BCH/FCCH消息。
对于在图7中所示的实施例,数据的一PHY帧在一个OFDM码元中发送。不同的PHY帧大小可被用于不同的OFDM码元大小。数据的每一个PHY帧可基于特定的编码方案编码并可进一步包括一CRC值,该值允许单独PHY帧被检验并在需要的时候重发。可在每一个PHY帧中发送的信息比特的数量是根据选择用于该PHY帧的编码和调制方案。表1列出了一组可被用于MIMO-OFDM***的速率,对于每个速率,有对于两个PHY帧大小和两个OFDM码元大小NS1=64NS2=256的各种参数。
表1
对于上述的示例设计,小PHY帧和小OFDM码元被用于BCH和FCCH。小和大PHY帧两者以及小和大OFDM码元两者可被用于FCH和RCH。一般,数据分组可使用任何数量的大OFDM码元以及任何数量的小OFDM码元发送。如果大OFDM码元的大小是小OFDM码元的4倍,则数据分组可使用NL个大OFDM码元和NSM个小OFDM码元(其中NL≥0而3≥NSM≥0)。在NL个大OFDM码元结束之后使用NSM个小OFDM码元降低了未使用的容量的量。不同大小的OFDM码元可因此被用于更好地将OFDM码元的容量匹配至数据的分组有效负载以最大化分组效率。
用于数据传输的OFDM码元大小可通过各种方式被提供给一接收机。在一个实施例中,FCCH提供在FCH和RCH上发射的每个数据分组的开始以及该分组的速率。一些其他的等价信息也可被发送给接收机。接收机之后可以确定每个将要发送的数据分组的大小、用于该数据分组的长和短OFDM码元的数量、以及每一个OFDM码元的开始。该信息接下来由该接收机用于确定将要对每一个OFDM码元执行的FFT的大小并合适地与FFT的定时对齐。在另一个实施例中,每个数据分组的开始以及其速率不被发送给接收机。在这种情况下,“盲”检测可被使用,且接收机可对每16个样本(即,循环前缀长度)执行一FFT并通过检验包括在PHY帧中的CRC值确定是否一PHY帧被发送。
对于MIMO-OFDM***500中给定的接入点和用户终端对,一MIMO信道由在接入点处的Nap个天线和在用户终端处的Nut个天线形成。MIMO信道可被分解成Nc个独立的信道,Nc≤min{Nap,Nut}。Nc个独立信道中的每一个也被称为MIMO信道的本征模式,其中“本征模式”通常是指一理论结构。最多Nc个独立数据流可在MIMO信道的Nc个本征模式上并发地发送。MIMO信道也可被看作包括Nc个可被用于数据传输的空间信道。每个空间信道可以对应或者不对应一本征模式,其根据发射机处的空间处理是否成功地将数据流正交化。
MIMO-OFDM***可被设计成支持数个传输模式。表2列出了可被用于装备了多个天线的用户终端的上行链路和下行链路的传输模式。
表2
传输模式 | 描述 |
分集 | 数据从多个发射天线和子频带冗余地发射以提供分集 |
波束操纵 | 数据在单个(最佳)空间信道上基于MIMO信道的原理本征模 |
式以全功率使用相位操纵信息发射 | |
空间复用 | 数据在多个空间信道上发射以实现更高的空间效率 |
对于波束操纵模式,一具有选择速率的PHY帧可产生用于每一个OFDM周期以在最佳的空间信道上传输。该PHY帧初始被处理以获得一组码元信号,其接下来被空间处理以获得NT组发射码元用于NT个发射天线。用于每一个天线的一组发射码元可被进一步处理以获得一用于该天线的OFDM码元。
对于空间复用模式,最多Nc个具有相同或者不同速率的PHY帧可被产生用于每一个OFDM码元周期以在Nc个空间信道上传输。这最多Nc个PHY帧被初始处理以获得最多Nc组调制码元,其接下来被空间处理以获得NT组发射码元用于NT组发射天线。用于每个天线的发射码元组被进一步处理以获得一用于该天线的OFDM码元。
在发射机和接收机处用于波束操纵和空间复用模式的处理在前述的美国临时专利申请序列号No.60/421,309中详细描述。用于波束操纵和空间复用模式的空间处理基本上对于短和长OFDM码元两者是一样的,虽然对于长OFDM码元具有更多的子频带。分集模式在下面描述。
在一个实施例中,分集模式在每个子频带的基础上使用空时发射分集(STTD)用于双发射分集。STTD支持在两个发射天线上独立的码元流的并发传输并维持在接收机处的正交。
STTD方案按照如下操作。假设两个调制码元,标记为s1和s2,将在一给定子频带上发射。发射机产生两个向量或者STTD码元,以及其中每一个STTD码元包括两个元素,“*”表示复数共轭,而“T”表示转置。或者,发射机可产生两个STTD码元,x1=[s1 s2]T以及在任何情况下,在每个STTD码元中的两个元素通常从不同的发射天线在两个OFDM码元周期内连续发射(即,STTD码元x1从天线1在两个OFDM码元周期中发射,而STTD码元x2从天线2在相同的两个码元周期内发射)。每一个STTD码元的持续时间因此是两个OFDM码元周期。
希望最小化和大OFDM码元的STTD处理相关的处理延迟和缓冲。在一个实施例中,两个STTD码元x1和x2在一对子频带从两个天线并发地发射。对于两个STTD码元x1=[s1 s2]T以及STTD码元x1的两个元素s1和s2可在子频带k上从两个天线发射,而STTD码元x2的两个元素和可在子频带k+1上从相同的两个天线发射。
如果发射机包括多个天线,则不同的天线对可被选择用于分集模式中的每一个数据子频带。表3列出了使用4个发射天线的STTD方案的示例子频带天线分配方案。
表3
对于表3中示出的实施例,发射天线1和2被用于具有索引为-26的短OFDM子频带,发射天线3和4被用于具有索引-25的短OFDM子频带,等等。子频带天线分配因此(1)4个发射天线可能的6种天线配对被用于8个数据频带,其均匀地分布在48个数据频带上,以及(2)天线配对对子频带分配为:不同的天线被用于相邻的子频带,这将提供更高的频率和空间分集。在表3中示出的子频带天线分配方案也可基于在等式(1)中示出在短和长OFDM子频带之间的映射被用于长OFDM码元。例如,发射天线1和2可被用于具有索引{-104、-103、-102和-101}的长OFDM码元,它们和具有索引-26的短OFDM码元相关。
在发射机及接收机处用于分集模式的处理在前述的美国临时专利申请序列号No.60/421,309中详细描述。
1.物理层处理
图8示出了MIMO-OFDM***500中的一接入点50x和两个用户终端520x和520y的一实施例的框图。
在下行链路上,在接入点510x,一发射(TX)数据处理器810从数据源808接收用户数据(即,信息比特)并从控制器830和可能的调度器834接收控制数据或者其他数据。控制器830和调度器834的可由单个处理器或者多个处理器执行。这些各种类型的数据可在不同的传输信道上发送。TX数据处理器810基于一个或多个编码和调制方案处理不同类型的数据以提供调制码元流用于每一个将要用于数据传输的空间信道。一TX空间处理器820从TX数据处理器810接收一个或多个调制码元流并在该调制码元上执行空间处理以提供一“发射”码元流用于每一个发射天线。处理器810和820进行的处理在下面描述。
每个调制器(MOD)(822)接收并处理不同的发射码元流以提供对应的OFDM码元流,该OFDM码元流被进一步处理以提供相应的下行链路信号。来自Nap个调制器822a至822p的下行链路信号接下来分别从Nap个天线824a至824p发射。
在每一个用户终端520,一个或多个天线852接收所发射的下行链路信号,且每一个天线提供一接收机输入信号至不同的解调器(DEMOD)854。每个解调器854执行与在调制器822处执行并提供“接收”码元的处理互补的处理。一接收机(RX)空间处理器860接下来在从所有解调器854接收的码元上执行空间处理以提供“恢复”的码元,其是对由接入点发射的调制码元的估计。
一RX数据处理器870接收并解复用所恢复的码元至它们各自的传输信道中。用于每一个传输信道的所恢复的码元可被处理以提供解码数据用于该传输信道。用于每个传输信道的解码数据可包括恢复的用户数据、控制数据等等,其可被提供给数据宿872进行存储以及/或者提供给控制器880进行进一步处理。
由接入点510和终端520进行的用于下行链路的处理在下面以及前述的美国临时专利申请序列号No.60/421,309中详细描述。用于上行链路的处理可以是与用于下行链路的处理相同的或者不同的。
对于下行链路,在每个活动用户终端520,RX空间处理器860还估计下行链路信道并提供信道状态信息(CSI)。CSI可包括信道响应估计、所接收的SNR等等。RX数据处理器870还提供在下行链路上接收的每个分组/帧的状态。控制器880接收信道状态信息和分组/帧状态并确定将要发送回该接入点的反馈信息。控制器880还可处理下行链路信道估计以获得操纵向量,其可被用于发射一操纵参考至接入点以及被用于下行链路数据接收和上行链路数据传输的空间处理。反馈信息和上行链路数据由TX数据处理器890处理,与导频数据相乘并由TX空间处理器892(如果存在)进行空间处理,由一个或多个调制器854调整,并通过一个或多个天线852发射回该接入点。
在接入点510,所发射的上行链路信号由天线824接收、由解调器822解调、并由RX空间处理器840和RX数据处理器842以与在用户终端执行的方式互补的方式进行处理。所恢复的反馈信息接下来被提供给控制器830和调度器834。调度器834可使用反馈信息执行数个功能:(1)选择一组用户终端用于在上行链路和下行链路上的数据传输,(2)选择用于所选择的用户终端的速率,以及(3)分配可用FCH/RCH资源至所选择的用户终端。控制器830还可以使用从上行链路传输获得的信息(例如,操纵向量)用于下行链路传输的处理,如下所述。
控制器830和880分别控制在接入点和用户端的各种处理单元的操作。例如,控制器830可确定在下行链路上发送的每个数据分组的有效负载大小并为每一个下行链路数据分组选择合适的OFDM码元。相应的,控制器880可确定在上行链路上发送的每一个分组数据的有效负载大小并为每一个上行链路数据分组选择合适大小的OFDM码元。
OFDM码元大小选择可以各种方式执行用于下行链路和上行链路。在一实施例中,控制器830以及/或者调度器834确定用于下行链路和上行链路两者的特定OFDM码元大小。在另一个实施例中,在发射机处的控制器确定用于发送的指定OFDM码元大小。OFDM码元大小选择接下来可被提供给接收机(例如,通过在开销信道上的信令或者在发送本身中的信令)。在另一个实施例中,在接收机处的控制器确定用于发送的特定OFDM码元大小,且该OFDM码元大小选择可被提供给发射机。OFDM码元大小选择可以各种形式被提供。例如,用于一给定传输的特定OFDM码元大小可从用于该传输的调度信息中导出,其可包括,例如,传输模式、空间信到、速率、以及用于传输的时间间隔。调度信息可由控制器880以及/或者调度器834、在发射机处的控制器、或者在接收机处的控制器产生。
对于下行链路和上行链路两者,用于每个数据分组的大和小OFDM码元的特定组合是根据用于每个可用OFDM码元大小的分组有效负载大小和OFDM码元容量。对于每一个数据分组,控制器可选择所需要的尽可能多的大OFDM码元,并合适地选择一个或多个附加的小OFDM码元用于数据分组。该选择可执行如下。假设两个OFDM码元大小被使用(例如,64个子频带和256个子频带),小OFDM码元的数据携载容量为TSM=48调制码元,而大OFDM码元的容量为TL=192调制码元。调制和编码方案允许在每个调制码元中发送M个信息比特。小OFDM码元的容量则是CSM=48·M信息比特,而大OFDM码元的容量是CL=192·M信息比特。使数据分组的长度为NP比特。控制器计算两个中间值,l和m,如下式:
l=int[NP/CL],以及
m=ceiling[(NP-l·CL)/CSM],
其中对a的“int”操作提供a的整数值,而对b的“ceiling”操作提供紧靠b的比b大的整数值。如果m<4,则用于数据分组的大OFDM码元的数量为NL=l而使用的小OFDM码元的数量为NSM=m。否则,如果m=4,则用于该数据分组的大OFDM码元的数量为NL=l+1而使用的小OFDM码元的数量为NSM=0。
控制器830和880分别提供OFDM码元大小控制信号至调制器/解调器822和854。在接入点,OFDM码元大小控制信号由调制器用于确定用于下行链路传输的IFFT操作的大小,还被解调器用于确定用于上行链路的FFT操作的大小。在用户终端,OFDM码元大小控制信号由解调器用于确定用于下行链路传输的FFT操作的大小,还由调制器确定用于上行链路传输的IFFT操作的大小。存储器单元832和882存储分别由控制器830和880使用的数据和程序代码。
图9A示出可被用于接入点和用户终端的发射部分的发射机单元900的一个实施例的框图。在TX数据处理器810,组帧单元910为每个准备在FCH或者RCH上发射的分组“组帧”数据。组帧可按照图7所示的执行以提供一个或多个PHY帧用于每个用户数据分组。组帧对于其他传输信道可被忽略。扰码器912为每一个传输信道扰码成帧/非成帧的数据以随机化数据。
编码器914接下来按照所选择的编码方案编码经扰码的数据以提供编码的比特。编码增加了数据传输的可靠性。一重复/截短(puncture)单元916接下来或者重复或者截短(即,删除)一些编码比特以获得每个PHY帧希望的编码速率。在一示例实施例中,编码器914是一1/2速率、限制长度为7的二进制卷积编码器。1/4的编码速率可通过重复每个编码比特一次来获得。大于1/2的编码速率可通过从编码器914删除一些编码比特来获得。
一交错器918接下来基于特定的交错方案交错(即,重新排序)来自单元916的编码比特。交错提供编码比特的时间、频率、以及/或者空间分集。在一个实施例中,准备在一给定的空间信道上发射的每一组48个连续编码比特在用于短OFDM码元的48个数据子频带上交错以提供频率分集。对于交错,每个组中的48个编码比特可被分配0-47的索引。每个编码比特索引与一不同的短OFDM码元相关。表3示出一个用于交错的示例编码比特-子频带分配。所有具有特定索引的编码比特在相关的子频带上发射。例如,每个组中的第一编码比特(具有索引0)在短OFDM子频带-26上发射,第二编码比特(具有索引1)在子频带1上发射,等等。
对于长OFDM码元,准备在一给定的空间信道上发射的每一组192个连续编码比特在用于长OFDM码元的192个数据子频带上交错。具体而言,第一子分组的具有索引0-47的48个编码比特可在具有索引l=4k,其中k=±{1...6,8...20,22...26}的48个数据子频带上发射,第二子分组的具有索引48-95的48个编码比特在具有索引l=4k+1的子频带上发射,第三子分组的具有索引96-143的48个编码比特在具有索引1=4k+2的子频带上发射,而最后的子分组的具有索引144-191的48个编码比特在具有索引1=4k+3的子频带上发射。相同的交错方案因此基本被用于短和长OFDM码元两者。
一码元映射单元920接下来按照一个或多个方案映射所交错的数据以提供调制码元。如在表1中所示的,所使用的特定调制方案是根据所选择的速率。相同的调制方案被用于分集模式中所有的数据子频带。不同的调制方案可被用于空间复用模式中的每一个空间信道。码元映射可通过下列执行(1)将B个比特的集合分组以形成B比特二进制值,其中B≥1,以及(2)映射每一个B比特二进制值至信号星座图中对应于所选择的调制方案的一个点。码元映射单元20提供一调制码元流至TX空间处理器920。
组帧单元910、扰码器912、编码器914、重复/截短单元916、交错器918以及码元映射单元920的一示例设计在前述的美国临时专利申请序列号No.60/421,309中描述。扰码、编码以及调制可基于由控制器830提供的控制信号执行。
TX空间处理器820从TX数据处理器810接收调制码元并执行空间处理用于空间复用、波束操纵或者分集模式。空间处理在前述的美国临时专利申请序列号No.60/421,309。TX空间处理器820提供一发射码元流至Nap个调制器822a至822ap中的每一个。
图9B示出了调制器822x的一个实施例的框图,其可被用于图9A中的每一个调制器822a至822ap。调制器822x包括一耦合至发射机单元(TMTR)940的OFDM调制器930。OFDM调制器930包括耦合至循环前缀产生器934的可变大小IFFT单元932。IFFT单元932可与图4中的IFFT单元400一起实现。IFFT单元932在提供给调制器822x的发射码元流上执行N点IFFT,其中N是可变的并且由控制器830提供的OFDM码元大小控制信号确定。例如,控制器830可选择小OFDM码元大小用于BCH和FCCH分段(如在图6中所示的)并可选择小和大OFDM码元大小的组合用于FCH分段,如上面所描述的。循环前缀产生器934附加一循环前缀至每一个来自IFFT单元932的变换的码元。循环前缀产生器934的输出是具有可变大小的OFDM码元流,如由控制器830所确定的。发射机单元940将OFDM码元转换成一个或多个模拟信号,并进一步放大、滤波并上变频该模拟信号以产生适于从一相关的天线824传输的下行链路信号。
2.导频
不同类型的导频可被发射以支持各种功能,诸如定时和频率查询、信道估计、校准等等。表4列出了4种类型的导频和他们的简短描述。
表4
MIMO导频可由具有短OFDM码元的发射机(例如,一接入点)发送并由一接收机(例如,一用户终端)用于估计信道响应矩阵H(k),对于子频带索引k∈K,其中K=±{1...26}。接收机接下来可执行信道响应矩阵H(k)的单值分解用于每个子频带,如下:
H(k)=U(k)∑(k)V H(k),对于k∈K 等式(4)
其中,U(k)是一个H(k)的左本征向量的(NT×NR)的酉矩阵;
∑(k)是一个H(k)的奇异值的(NR×NT)的对角矩阵;
V(k)是一个H(k)的右本征向量的(NT×NT)的酉矩阵;
“H”表示共轭转置,NT表示发射天线的数量,而NR表示接收天线的数量。
一酉矩阵M由性质M H M=I表征,其中I是单位矩阵。每个对角矩阵∑(k)中的奇异值可按照从最大到最小的顺序排列,且矩阵U(k)和V(k)中的列可以被相应地排序。
一“宽带”本征模式可被定义为在排序之后所有子频带的相同顺序本征模式组。因此,宽带本征模式m包括所有子频带的本征模式m。每一个宽带本征模式与所有子频带的本征向量不同的组相关。“主”宽带本征模式排序后在每个矩阵∑(k)中的最大的奇异值相关。
如果相同的频带被用于下行链路和上行链路两者,则用于一个链路的信道响应矩阵是用于另一个链路的信道响应矩阵的转置。校准可被执行以考虑到在接入点和用户终端处的发射/接收链的频率响应中的差别。一操纵参考可由发射机发射并由接收机用于估计可被用于数据接收和发送的空间处理的本征向量。
一操纵参考可由一发射机(例如,一终户终端)发射用于宽带本征模式m,如下:
x m(k)=v m(k)·p(k),对于k∈K 等式(5)
其中x m(k)是一个(NT×1)用于宽带本征模式m的子频带k的发射向量;
v m(k)是用于宽带本征模式m的子频带k的操纵向量(即,矩阵V(k)的第m列)以及;
p(k)是子频带k的导频码元。
向量x m(k)包括NT个将要从NT个发射天线发送用于子频带k的发射码元。
在接收机(例如,接入点)处接收的操纵导频参考可被表示为:
r m(k)=H(k)x m(k)+n(k),对于k∈K 等式(6)
=u m(k)σm(k)p(k)+n(k)
其中r m(k)是用于宽带本征模式m的子频带k的所接收的向量;
u m(k)是用于本征模式m的子频带k的操纵向量(即,矩阵U(k)的第m列);以及
σm(k)是用于宽带本征模式m的子频带k的奇异值;以及
n(k)是噪声。
如在等式(6)所示,在接收机处,所接收的操纵参考(在没有噪声的情况下)大约为u m(k)σm(k)p(k)。接收机可因此基于从该子频带上接收的操纵参考获得对u m(k)和σm(k)的估计用于子频带k,如在前述的美国临时专利申请序列号No.60/421,309所描述的。
操纵参考在每一个OFDM码元周期中被发送用于一个宽带本征模式(不使用子频带复用),并可因而被用于获得对于本征向量u m(k)的估计用于宽带本征模式的每一个子频带。由于酉矩阵U(k)的多个本征向量的估计是在不同的OFDM码元周期中获得的,且由于噪声和无线信道中的其他降级源,对于酉矩阵的估计的本征向量(其是单独导出的)可能不是相互正交的。为了改善性能,每个酉矩阵U(k)的Nc个估计的本征向量u m(k)可使用QR因式分解或一些其他的正交化技术被强迫彼此正交,如在前述的美国临时专利申请序列号No.60/438,601中所描述的。
操纵参考可使用短OFDM码元发送。接收机能够处理所接收的操纵参考以获得用于每一个可用于操纵参考传输的短OFDM子频带的操纵向量。对于上述的示例设计,每一个短OFDM子频带与四个长OFDM子频带相关。如果操纵参考使用短OFDM码元发送,则用于长OFDM子频带的操纵向量可以各种方式获得。
在一个实施例中,获得的用于短OFDM子频带k的操纵向量被用于长OFDM子频带l=4k至l=4k+3。该实施例对于低至中等的SNR提供好的性能。对于高SNR,当信道的相干带宽较小时会出现一些降级。相干带宽是信道基本恒定或者平滑的带宽。
在另一个实施例中,获得的用于短OFDM子频带的操纵向量u m(k)被内插以获得用于长OFDM子频带的操纵向量u m(l)。内插可以下列方式被执行:操纵向量u m(l)在子频带和子频带之间不表现出比潜在的信道响应矩阵H(k)实质上更多的可变性。可变性的一个来源是在H(k)的左和右本征向量中的相位歧义性,这是由于H(k)的左和右本征向量对于单元长度复数常数是唯一的。具体而言,对于任何满足下式的单元长度向量v m(k)和u m(k):
H(k)v m(k)=u m(k)σm(k),等式(7)
相位歧义性可通过在对H(k)的奇异值分解计算时进行一些预防。这可通过限制奇异值分解的解以使V(k)的每一列的第一元素是非负的。这种限制消除了当本征向量中的变化不是平滑的且本征向量的主元素的幅度不接近于零时子频带和子频带之间的任意相位旋转。该限制可通过将对角矩阵R(k)与每一个酉矩阵U(k)和V(k)右乘(post-multiplying)来强制执行,其可从普通模式中获得并可包含任意相位旋转。矩阵R(k)的对角元素ρi(k)可被表现为:
其中vLi(k)是V(k)的第i列的第一元素,以及
该受限本征向量R(k)V(k)可接下来被用于操纵参考,如在等式(5)中所示的。在接收机处,接收的向量r m(k)可被处理以获得对于u m(k)和σm(k)的估计,它们可分别被内插以获得对于u m(l)和σm(l)的估计。
将短OFDM码元用于MIMO导频和操纵参考减少了和信道响应矩阵H(k)相关的奇异值分解的处理负载。此外,可以发现内插,以及上述的用于避免子频带和子频带之间的任意相位旋转的限制可减少性能上的降级,这种降级是由于基于在少于用于数据传输的所有子频带的子频带上的定位参考传输的操纵向量的内插。
载波导频可由接入点发射并由用户终端用于载波信号的相位跟踪。对于短OFDM码元,在波信号可在4个具有索引±{7,21}的短OFDM子频带上发射,如在表3中所示。对于长OFDM码元,载波导频可在16个对应的具有索引±{28+i,84+i},其中i=0,1,2,3的长OFDM子带上发射。或者,载波导频可在4个具有索引±{28,84}的长OFDM子频带上发射,在这种情况下,其他12个长OFDM子带可被用于数据传输或者其他目的。
各种类型的导频以及它们在发射机和接收机处的处理在前述的美国临时专利申请序列号No.60/421,309中详细描述。
为了简明,使用不同大小的OFDM码元的技术是结合下行链路描述的。这些技术也可以被用于上行链路。一固定OFDM码元大小可被用于一些上行链路传输(例如,在RACH上发送的消息)而不同大小的OFDM码元可被用于其它的上行链路传输(例如,在RCH上发送的数据分组)。被用于每一个上行链路数据分组的大和小OFDM码元的指定组合可根据分组有效负载大小并可由控制器880确定(例如,基于由控制器880产生的或者由控制器830以及/或者调度器834提供的调度信息,如上所述)。
此处描述的在OFDM***中使用不同大小的OFDM码元的技术可由各种方法实现。例如,这些技术可以在硬件、软件、或者它们的组合中实现。对于硬件实现,用于实现任何一个技术或者它们的组合的元件可在一个或多个应用专用集成电路(ASIC)、数字信号处理器(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、其他设计为执行此处所描述的功能的电子单元、或者它们的组合。
对于软件实现,此处描述的技术可在执行此处所描述的功能的模块(例如。进程、函数等等)中实现。软件代码可存储在一存储单元(例如,图8中的存储器单元832和882)中并由一处理器(例如,控制器830和880)执行。存储器单元可被实现在处理器中或在处理器之外,当在处理器之外时,其通过本领域中公知的各种方式可通信地耦合至处理器。
标题被包括在此处作为参考并辅助定位特定的章节。这些标题不是为了限制其下所描述的概念的范围,这些概念可被应用在整个说明书中的其他章节中。
前面对于所揭示的实施例的描述是提供给本领域的技术人员实现或者使用本发明的。对于本领域的技术人员来说,对于这些实施例的各种改变将是很明显的,且此处定义的一般原理可被应用到其他的实施例而不脱离本发明的范围。因此,本发明并不限于此处示出的实施例,而是应该按照此处揭示的原理和创新特征的最宽泛的范围。
Claims (4)
1.一种在多输入多输出(MIMO)正交频分多路复用(OFDM)通信***中处理操纵参考的方法,包含:
从一组天线接收用于所述操纵参考的一组OFDM码元;
处理所述一组OFDM码元以获得用于多个子频带中的每一个子频带的操纵向量;以及
内插用于所述多个子频带的操纵向量以获得用于不在所述多个子频带中的附加子频带的操纵向量,
其中内插用于所述多个子频带的操纵向量以获得用于不在所述多个子频带中的附加子频带的操纵向量包括:
通过内插用于短OFDM子频带的操纵向量来获得用于长OFDM子频带的操纵向量。
2.如权利要求1所述的方法,其特征在于,所述内插是以使得所述用于长OFDM子频带的操纵向量在子频带和子频带之间相对于潜在的信道响应矩阵而言表现出有限的可变性。
3.一种在多输入多输出(MIMO)正交频分多路复用(OFDM)通信***中处理操纵参考的设备,包含:
用于从一组天线接收用于所述操纵参考的一组OFDM码元的装置;
用于处理所述一组OFDM码元以获得用于多个子频带中的每一个子频带的操纵向量的装置;以及
用于内插用于所述多个子频带的操纵向量以获得用于不在所述多个子频带中的附加子频带的操纵向量的装置,
其中所述用于内插用于多个子频带的操纵向量以获得用于不在所述多个子频带中的附加子频带的操纵向量的装置包括:
用于通过内插用于短OFDM子频带的操纵向量来获得用于长OFDM子频带的操纵向量的装置。
4.如权利要求3所述的设备,其特征在于,所述用于通过内插用于短OFDM子频带的操纵向量来获得用于长OFDM子频带的操纵向量的装置被配置成以使得所述用于长OFDM子频带的操纵向量在子频带和子频带之间相对于潜在的信道响应矩阵而言表现出有限的可变性的方式来执行内插。
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Families Citing this family (224)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8570988B2 (en) | 2002-10-25 | 2013-10-29 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
US20040081131A1 (en) | 2002-10-25 | 2004-04-29 | Walton Jay Rod | OFDM communication system with multiple OFDM symbol sizes |
US8208364B2 (en) | 2002-10-25 | 2012-06-26 | Qualcomm Incorporated | MIMO system with multiple spatial multiplexing modes |
US7002900B2 (en) | 2002-10-25 | 2006-02-21 | Qualcomm Incorporated | Transmit diversity processing for a multi-antenna communication system |
US8169944B2 (en) | 2002-10-25 | 2012-05-01 | Qualcomm Incorporated | Random access for wireless multiple-access communication systems |
US8134976B2 (en) | 2002-10-25 | 2012-03-13 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
US8320301B2 (en) | 2002-10-25 | 2012-11-27 | Qualcomm Incorporated | MIMO WLAN system |
US7986742B2 (en) | 2002-10-25 | 2011-07-26 | Qualcomm Incorporated | Pilots for MIMO communication system |
EP1566907B1 (en) * | 2002-11-20 | 2010-06-23 | NTT DoCoMo, Inc. | Communication system, communication method, transmission device, reception device, and control program |
US6950387B2 (en) * | 2003-02-28 | 2005-09-27 | Wisair Ltd. | Communication method, system, and apparatus that combines aspects of cyclic prefix and zero padding techniques |
EP1469613A1 (de) * | 2003-04-16 | 2004-10-20 | Siemens Aktiengesellschaft | Verfahren und Sender zur Übertragung von Daten in einem Mehrträgersystem über eine Mehrzahl von Sendeantennen |
US7400573B2 (en) * | 2003-04-29 | 2008-07-15 | Intel Corporation | Dynamic allocation of cyclic extension in orthogonal frequency division multiplexing systems |
EP1636928A4 (en) * | 2003-05-14 | 2012-01-04 | Texas Instruments Inc | MULTI-BAND DISTRICT COMMUNICATION SYSTEMS |
US7835262B2 (en) * | 2003-05-14 | 2010-11-16 | Texas Instruments Incorporated | Multi-band OFDM communications system |
AU2003245895A1 (en) * | 2003-05-27 | 2005-01-21 | Telefonaktiebolaget Lm Ericsson (Publ) | Scheduler and method of scheduling data for communication between a node station and plurality of radio terminals |
EP1635517B1 (en) * | 2003-06-18 | 2021-04-14 | Nippon Telegraph And Telephone Corporation | Wireless packet communication method |
EP1639776B1 (en) * | 2003-06-30 | 2015-08-26 | Agere Systems, Inc. | Methods and apparatus for backwards compatible communication in a multiple antenna communication system using time orthogonal symbols |
US7969857B2 (en) * | 2003-08-07 | 2011-06-28 | Nortel Networks Limited | OFDM system and method employing OFDM symbols with known or information-containing prefixes |
KR20050015913A (ko) * | 2003-08-14 | 2005-02-21 | 삼성전자주식회사 | 직교 주파수 분할 다중 방식 통신 시스템에서 파일럿송수신 장치 및 방법 |
ATE394018T1 (de) * | 2003-08-19 | 2008-05-15 | Matsushita Electric Ind Co Ltd | Lautsprecher |
US7693034B2 (en) * | 2003-08-27 | 2010-04-06 | Sasken Communication Technologies Ltd. | Combined inverse fast fourier transform and guard interval processing for efficient implementation of OFDM based systems |
DE60317195T2 (de) * | 2003-09-08 | 2008-08-07 | Abb Research Ltd. | Datenverschlüsselung in der physikalischen Schicht eines Datenübertragungssystems |
US8908496B2 (en) * | 2003-09-09 | 2014-12-09 | Qualcomm Incorporated | Incremental redundancy transmission in a MIMO communication system |
JP2005110130A (ja) * | 2003-10-01 | 2005-04-21 | Samsung Electronics Co Ltd | 共通チャネル伝送システム、共通チャネル伝送方法及び通信プログラム |
JP2005123788A (ja) * | 2003-10-15 | 2005-05-12 | Sharp Corp | 無線通信装置 |
KR100950646B1 (ko) * | 2003-10-16 | 2010-04-01 | 삼성전자주식회사 | 다입다출 직교주파수분할다중 통신 시스템의 동기화를위한 프리앰블 전송 방법 |
KR100969780B1 (ko) * | 2003-10-31 | 2010-07-13 | 삼성전자주식회사 | 직교 주파수 분할 다중 방식 통신 시스템에서 파일럿 신호 송수신 장치 및 방법 |
KR100520159B1 (ko) * | 2003-11-12 | 2005-10-10 | 삼성전자주식회사 | 다중 안테나를 사용하는 직교주파수분할다중 시스템에서간섭신호 제거 장치 및 방법 |
KR100975720B1 (ko) * | 2003-11-13 | 2010-08-12 | 삼성전자주식회사 | 다중 송수신 안테나를 구비하는 직교주파수분할다중화 시스템에서 공간 분할 다중화를 고려하여 채널 할당을 수행하는 방법 및 시스템 |
FI20031702A0 (fi) * | 2003-11-21 | 2003-11-21 | Nokia Corp | Useiden kantoaaltojen allokointi usealle käyttäjälle viestintäjärjestelmässä |
US7532723B2 (en) * | 2003-11-24 | 2009-05-12 | Interdigital Technology Corporation | Tokens/keys for wireless communications |
US9473269B2 (en) | 2003-12-01 | 2016-10-18 | Qualcomm Incorporated | Method and apparatus for providing an efficient control channel structure in a wireless communication system |
IL159173A0 (en) * | 2003-12-03 | 2004-06-01 | Zion Hadad | Ofdm communication channel |
SE0303607D0 (sv) * | 2003-12-30 | 2003-12-30 | Ericsson Telefon Ab L M | Brandwidth signalling |
US20050220322A1 (en) * | 2004-01-13 | 2005-10-06 | Interdigital Technology Corporation | Watermarks/signatures for wireless communications |
US20070121939A1 (en) * | 2004-01-13 | 2007-05-31 | Interdigital Technology Corporation | Watermarks for wireless communications |
TWI305092B (en) * | 2004-01-13 | 2009-01-01 | Interdigital Tech Corp | Orthogonal frequency division multiplexing (ofdm) method and apparatus for protecting and authenticating wirelessly transmitted digital information |
EP1712019B1 (en) | 2004-01-29 | 2014-01-15 | Neocific, Inc. | Methods and apparatus for overlaying multi-carrier and direct sequence spread spectrum signals in a broadband wireless communication system |
TW200529037A (en) * | 2004-02-18 | 2005-09-01 | Interdigital Tech Corp | Method and system for using watermarks in communication systems |
KR100617729B1 (ko) * | 2004-03-05 | 2006-08-28 | 삼성전자주식회사 | 셀룰러 통신 시스템에서 다중 주파수 재사용율 기반의 주파수 자원 할당 시스템 및 방법 |
US7447268B2 (en) * | 2004-03-31 | 2008-11-04 | Intel Corporation | OFDM system with per subcarrier phase rotation |
CN1973471B (zh) * | 2004-04-01 | 2011-06-08 | 北方电讯网络有限公司 | 空时块编码***和方法 |
US8422585B2 (en) * | 2004-04-01 | 2013-04-16 | Research In Motion Limited | Space-time block coding systems and methods |
KR100744336B1 (ko) | 2004-06-18 | 2007-07-30 | 삼성전자주식회사 | Ofdm기반의 무선 통신 시스템에서의 핸드오버 방법 |
US20050288062A1 (en) * | 2004-06-23 | 2005-12-29 | Hammerschmidt Joachim S | Method and apparatus for selecting a transmission mode based upon packet size in a multiple antenna communication system |
US20060002487A1 (en) * | 2004-06-30 | 2006-01-05 | Kriedte Kai R | Methods and apparatus for parametric estimation in a multiple antenna communication system |
TW200602902A (en) * | 2004-07-12 | 2006-01-16 | Benq Corp | Method of calculating FFT |
US9246728B2 (en) | 2004-07-29 | 2016-01-26 | Qualcomm Incorporated | System and method for frequency diversity |
CN101036336B (zh) * | 2004-07-29 | 2012-12-26 | 高通股份有限公司 | 交织***和方法 |
AU2005274003B2 (en) | 2004-08-12 | 2009-03-05 | Interdigital Technology Corporation | Method and system for controlling access to a wireless communication medium |
US8484272B2 (en) * | 2004-08-20 | 2013-07-09 | Qualcomm Incorporated | Unified pulse shaping for multi-carrier and single-carrier waveforms |
US7366250B2 (en) * | 2004-09-09 | 2008-04-29 | Agere Systems Inc. | Method and apparatus for improved efficiency in an extended multiple antenna communication system |
KR101158153B1 (ko) * | 2004-09-09 | 2012-06-19 | 에이저 시스템즈 인크 | 다중 안테나 통신 시스템에서의 데이터 전송 방법, 다중 안테나 통신 시스템의 송신기, 다중 안테나 통신 시스템에서의 데이터 수신 방법 및 다중 안테나 통신 시스템의 수신기 |
WO2006031090A1 (en) * | 2004-09-18 | 2006-03-23 | Samsung Electronics Co., Ltd. | Apparatus and method for frequency synchronization in ofdm system |
CN101027863B (zh) | 2004-09-27 | 2012-06-27 | 夏普株式会社 | 无线发送装置 |
US7969858B2 (en) | 2004-10-14 | 2011-06-28 | Qualcomm Incorporated | Wireless terminal methods and apparatus for use in wireless communications systems supporting different size frequency bands |
US7567502B2 (en) * | 2004-10-14 | 2009-07-28 | Qualcomm Incorporated | Methods and apparatus for adjusting bandwidth allocation in a wireless communications system |
US20060155795A1 (en) * | 2004-12-08 | 2006-07-13 | Anderson James B | Method and apparatus for hardware implementation of high performance fast fourier transform architecture |
US7852822B2 (en) * | 2004-12-22 | 2010-12-14 | Qualcomm Incorporated | Wide area and local network ID transmission for communication systems |
US8160046B2 (en) * | 2004-12-22 | 2012-04-17 | Qualcomm Incorporated | Control channel assignment in a wireless communication network |
US7904723B2 (en) * | 2005-01-12 | 2011-03-08 | Interdigital Technology Corporation | Method and apparatus for enhancing security of wireless communications |
US20060176966A1 (en) * | 2005-02-07 | 2006-08-10 | Stewart Kenneth A | Variable cyclic prefix in mixed-mode wireless communication systems |
US20060198460A1 (en) * | 2005-03-03 | 2006-09-07 | Texas Instruments Incorporated | Link adaptation for high throughput multiple antenna WLAN systems |
US8325826B2 (en) * | 2005-03-09 | 2012-12-04 | Qualcomm Incorporated | Methods and apparatus for transmitting signals facilitating antenna control |
US7471702B2 (en) * | 2005-03-09 | 2008-12-30 | Qualcomm Incorporated | Methods and apparatus for implementing, using, transmitting, and/or receiving signals at least some of which include intentional null tones |
US7826807B2 (en) * | 2005-03-09 | 2010-11-02 | Qualcomm Incorporated | Methods and apparatus for antenna control in a wireless terminal |
US7742444B2 (en) * | 2005-03-15 | 2010-06-22 | Qualcomm Incorporated | Multiple other sector information combining for power control in a wireless communication system |
US8031583B2 (en) * | 2005-03-30 | 2011-10-04 | Motorola Mobility, Inc. | Method and apparatus for reducing round trip latency and overhead within a communication system |
JP4358158B2 (ja) * | 2005-03-31 | 2009-11-04 | 株式会社エヌ・ティ・ティ・ドコモ | 送信装置および割当方法 |
JP2008541539A (ja) * | 2005-05-04 | 2008-11-20 | エヌエックスピー ビー ヴィ | Mimo送信用のデータストリームの個別インターリービング |
US7466749B2 (en) * | 2005-05-12 | 2008-12-16 | Qualcomm Incorporated | Rate selection with margin sharing |
US7613138B2 (en) * | 2005-05-23 | 2009-11-03 | Microsoft Corporation | Separating control and data in wireless networks |
JP4732808B2 (ja) * | 2005-06-14 | 2011-07-27 | 株式会社エヌ・ティ・ティ・ドコモ | 無線パラメータ群を生成する装置 |
US9055552B2 (en) * | 2005-06-16 | 2015-06-09 | Qualcomm Incorporated | Quick paging channel with reduced probability of missed page |
US8750908B2 (en) * | 2005-06-16 | 2014-06-10 | Qualcomm Incorporated | Quick paging channel with reduced probability of missed page |
US20070002726A1 (en) * | 2005-07-01 | 2007-01-04 | Zangi Kambiz C | System and method for adapting a cyclic prefix in an orthogonal frequency division multiplexing (OFDM) system |
US20090141818A1 (en) * | 2005-07-14 | 2009-06-04 | Matsushita Electric Industrial Co., Ltd. | Wireless communication apparatus and wireless communication method in multicarrier communication |
JP4753737B2 (ja) * | 2005-07-18 | 2011-08-24 | 三洋電機株式会社 | 無線装置 |
US9042212B2 (en) | 2005-07-29 | 2015-05-26 | Qualcomm Incorporated | Method and apparatus for communicating network identifiers in a communication system |
US9391751B2 (en) | 2005-07-29 | 2016-07-12 | Qualcomm Incorporated | System and method for frequency diversity |
US20070064665A1 (en) | 2005-08-23 | 2007-03-22 | Interdigital Technology Corporation | Method and apparatus for accessing an uplink random access channel in a single carrier frequency division multiple access system |
US7885660B2 (en) * | 2005-08-30 | 2011-02-08 | Samsung Electronics Co., Ltd. | Method and system for performing a soft handoff in an OFDMA wireless network |
US20070072621A1 (en) * | 2005-09-27 | 2007-03-29 | Mukkavilli Krishna K | Position location using transmitters with timing offset |
US9354297B2 (en) * | 2005-09-27 | 2016-05-31 | Qualcomm Incorporated | Position location using phase-adjusted transmitters |
US8981996B2 (en) * | 2005-09-27 | 2015-03-17 | Qualcomm Incorporated | Position location using transmitters with timing offset and phase adjustment |
KR101304785B1 (ko) * | 2005-09-29 | 2013-09-05 | 인터디지탈 테크날러지 코포레이션 | Mimo 빔형성 기반의 단일 반송파 주파수 분할 다중접속 시스템 |
WO2007037414A1 (ja) * | 2005-09-30 | 2007-04-05 | Matsushita Electric Industrial Co., Ltd. | 無線通信移動局装置およびrachデータ送信方法 |
JP2009510964A (ja) * | 2005-10-05 | 2009-03-12 | エヌエックスピー ビー ヴィ | Mimo伝送用データストリームの個別インターリーブ方法 |
US20070097935A1 (en) * | 2005-10-27 | 2007-05-03 | Alexei Gorokhov | In-band rate control for an orthogonal frequency division multiple access communication system |
US20090207790A1 (en) * | 2005-10-27 | 2009-08-20 | Qualcomm Incorporated | Method and apparatus for settingtuneawaystatus in an open state in wireless communication system |
JP2009514413A (ja) * | 2005-10-27 | 2009-04-02 | クゥアルコム・インコーポレイテッド | 無線通信システムにおけるサービングセクタを保守する方法 |
US20070147226A1 (en) * | 2005-10-27 | 2007-06-28 | Aamod Khandekar | Method and apparatus for achieving flexible bandwidth using variable guard bands |
KR100878176B1 (ko) | 2005-12-10 | 2009-01-12 | 삼성전자주식회사 | 다중 홉 릴레이 방식의 셀룰러 네트워크에서 동작 전환갭을조정하기 위한 장치 및 방법 |
WO2007073116A1 (en) * | 2005-12-22 | 2007-06-28 | Electronics And Telecommunications Research Institute | Method for demodulating broadcast channel by using synchronization channel at ofdm system with transmit diversity and transmitting/receiving device therefor |
KR20070108316A (ko) * | 2005-12-22 | 2007-11-09 | 한국전자통신연구원 | Ofdm 셀룰라 시스템에서 동기채널 및 bch 를 위한송신 다이버시티 방법 |
KR20070073138A (ko) * | 2006-01-03 | 2007-07-10 | 삼성전자주식회사 | 다중 홉 릴레이 방식의 광대역 무선 접속 통신 시스템에서투명 중계하기 위한 장치 및 방법 |
KR100871856B1 (ko) * | 2006-01-06 | 2008-12-03 | 삼성전자주식회사 | 광대역 무선접속 통신시스템에서 중계 서비스를 제공하기위한 장치 및 방법 |
US8130857B2 (en) * | 2006-01-20 | 2012-03-06 | Qualcomm Incorporated | Method and apparatus for pilot multiplexing in a wireless communication system |
KR100895183B1 (ko) * | 2006-02-03 | 2009-04-24 | 삼성전자주식회사 | 무선통신 시스템을 위한 주변 셀 간섭의 제거를 위한송수신 방법 및 장치 |
KR101218495B1 (ko) * | 2006-02-21 | 2013-01-18 | 삼성전자주식회사 | 직교 주파수 분할 다중화/시분할 듀플렉스 방식의 이동통신시스템에서 상향링크 사전등화를 위한 하향링크 채널변화에 따른 적응채널 예측 장치 및 방법 |
KR101012385B1 (ko) * | 2006-03-24 | 2011-02-09 | 엘지전자 주식회사 | 상이한 채널 조건들과 1xEV-DO 및 NxEV-DO 와의 구 호환을 위한 OFDM 심볼 설계 |
KR101459250B1 (ko) | 2006-05-09 | 2014-11-12 | 인터디지탈 테크날러지 코포레이션 | Ofdm-mimo 시스템을 위한 랜덤 액세스 채널 |
KR100995050B1 (ko) * | 2006-05-19 | 2010-11-19 | 엘지전자 주식회사 | 무선 통신 시스템에서 효과적이고 효율적인 송신을 위해 무선 자원을 구성하는 방법 |
US7822156B2 (en) * | 2006-06-01 | 2010-10-26 | Realtek Semiconductor Corp | Channel estimation |
CN101461203B (zh) * | 2006-06-14 | 2013-03-27 | 艾格瑞***有限公司 | 调制数据符号集的方法和设备及相应的解调方法和设备 |
JP5215311B2 (ja) | 2006-06-16 | 2013-06-19 | クゥアルコム・インコーポレイテッド | ビーコン信号において情報を漸進的にブロードキャストすること |
ATE418193T1 (de) * | 2006-06-23 | 2009-01-15 | Mitsubishi Electric Inf Tech | Verfahren und vorrichtung zur bestimmung von kanalzustandsinformationen welche von einer ersten zu einer zweiten telekommunikationsvorrichtung zu übertragen sind |
US10084627B2 (en) | 2006-07-10 | 2018-09-25 | Qualcomm Incorporated | Frequency hopping in an SC-FDMA environment |
CN101106435B (zh) | 2006-07-10 | 2011-08-03 | 华为技术有限公司 | 一种多对线共同传输的方法及发送端和接收端 |
US8225186B2 (en) | 2006-07-14 | 2012-07-17 | Qualcomm Incorporated | Ecoding and decoding methods and apparatus for use in a wireless communication system |
US7720485B2 (en) | 2006-07-14 | 2010-05-18 | Qualcomm Incorporated | Methods and apparatus related to assignment in a wireless communications system |
US7724853B2 (en) * | 2006-07-14 | 2010-05-25 | Qualcomm Incorporated | Enabling mobile switched antennas |
US8400998B2 (en) | 2006-08-23 | 2013-03-19 | Motorola Mobility Llc | Downlink control channel signaling in wireless communication systems |
US8725066B2 (en) * | 2006-08-23 | 2014-05-13 | Samsung Electronics Co., Ltd. | Apparatus and method for allocating resource to mobile station connected to relay station in broadband wireless communication system |
US7769119B2 (en) * | 2006-09-27 | 2010-08-03 | Sandbridge Technologies, Inc. | Method of initial synchronization of a communication signal |
MX2009003608A (es) * | 2006-10-02 | 2009-04-22 | Lg Electronics Inc | Metodo para transmitir una señal de control de enlace descendente. |
EP2080302A4 (en) | 2006-10-02 | 2014-04-02 | Lg Electronics Inc | TRANSMISSION OF A MULTIPLEX AGE CONTROL SIGNAL |
US9130618B2 (en) * | 2006-10-26 | 2015-09-08 | Alcatel Lucent | MIMO communication system with variable slot structure |
KR101084779B1 (ko) * | 2006-11-06 | 2011-11-21 | 콸콤 인코포레이티드 | Mimo 전송을 위한 코드워드 레벨 스크램블링을 위한 방법들 및 장치들 |
US8179985B2 (en) * | 2006-11-13 | 2012-05-15 | Industrial Technology Research Institute | Method and apparatus for providing time-frequency diversity in OFDM wireless communication systems |
US8355464B2 (en) | 2006-11-16 | 2013-01-15 | Electronics And Telecommunications Research Institute | Method for generating and transmitting downlink frame |
EP2091165B1 (en) * | 2006-12-08 | 2014-09-17 | Fujitsu Limited | Method for reducing interference between adjacent sectors, and base station apparatus |
US20080165866A1 (en) * | 2007-01-08 | 2008-07-10 | Koon Hoo Teo | Cooperative Communication and Shared Handoff among Base, Relay, and Mobile Stations in OFDMA Cellular Networks |
EP1944896A1 (en) * | 2007-01-09 | 2008-07-16 | Matsushita Electric Industrial Co., Ltd. | Configuration of control channels in a mobile communication system |
US20080212461A1 (en) * | 2007-03-01 | 2008-09-04 | Texas Instruments Incorporated | Transform-based systems and methods for reconstructing steering matrices in a mimo-ofdm system |
ES2657117T3 (es) | 2007-03-19 | 2018-03-01 | Lg Electronics, Inc. | Método y aparato para transmitir/recibir información de asignación de recursos en un sistema de comunicación móvil |
KR101049138B1 (ko) * | 2007-03-19 | 2011-07-15 | 엘지전자 주식회사 | 이동 통신 시스템에서, 수신확인신호 수신 방법 |
KR101468490B1 (ko) | 2007-05-02 | 2014-12-10 | 삼성전자주식회사 | 무선 통신 시스템에서 제어 채널들의 집합을 한정하여 송수신하는 방법 및 장치 |
US7885176B2 (en) * | 2007-06-01 | 2011-02-08 | Samsung Electronics Co., Ltd. | Methods and apparatus for mapping modulation symbols to resources in OFDM systems |
KR100908063B1 (ko) | 2007-06-13 | 2009-07-15 | 엘지전자 주식회사 | 이동 통신 시스템에서 확산신호를 송신하는 방법 |
KR100913090B1 (ko) | 2007-06-13 | 2009-08-21 | 엘지전자 주식회사 | 통신 시스템에서 확산 신호를 송신하는 방법 |
KR100900289B1 (ko) | 2007-06-21 | 2009-05-29 | 엘지전자 주식회사 | 직교 주파수 분할 다중화 시스템에서 제어 채널을 송수신하는 방법 |
KR100884385B1 (ko) * | 2007-08-31 | 2009-02-17 | 한국전자통신연구원 | 신호 송신 장치 및 그 방법, 이를 위한 역고속 푸리에 변환장치 |
CN101790862B (zh) * | 2007-08-31 | 2013-03-27 | 富士通天株式会社 | 分集接收装置、分集接收方法和数字电视机接收装置 |
US20090074103A1 (en) * | 2007-09-14 | 2009-03-19 | Texas Instruments Incorporated | Rate matching to maintain code block resource element boundaries |
US9066264B2 (en) * | 2007-10-01 | 2015-06-23 | Google Technology Holdings LLC | Status report triggering in wireless communication system |
US8098623B2 (en) * | 2007-10-03 | 2012-01-17 | Telefonaktiebolaget Lm Ericsson | Telecommunications frame structure accomodating differing formats |
US8218496B2 (en) * | 2007-10-26 | 2012-07-10 | Texas Instruments Incorporated | Random access cyclic prefix dimensioning in wireless networks |
US7986648B2 (en) * | 2007-10-31 | 2011-07-26 | Qualcomm Incorporated | Methods and apparatus for communicating information using different types of symbols |
US8861549B2 (en) * | 2007-11-05 | 2014-10-14 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiple compatible OFDM systems with different bandwidths |
US20090161616A1 (en) * | 2007-11-07 | 2009-06-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Ranging procedure identification of enhanced wireless terminal |
US8155701B2 (en) * | 2007-11-07 | 2012-04-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Uplink radio frames apportioned for plural multiple access technologies |
JP5490016B2 (ja) * | 2007-12-20 | 2014-05-14 | インターナショナル・ビジネス・マシーンズ・コーポレーション | 所与の領域内に含まれるrfidタグ付き商品を決定するためのシステム、方法、およびコンピュータ・プログラム(システムおよび方法) |
US20090185476A1 (en) * | 2008-01-16 | 2009-07-23 | Telefonaktiebolaget Lm Ericsson | Duration-shortened ofdm symbols |
WO2009102180A1 (en) | 2008-02-17 | 2009-08-20 | Lg Electronics Inc. | Method of communication using frame |
US8107545B2 (en) * | 2008-04-30 | 2012-01-31 | Samsung Electronics Co., Ltd. | Method and system for phase tracking in wireless communication systems |
DE602008001789D1 (de) * | 2008-05-14 | 2010-08-26 | Ericsson Telefon Ab L M | Verfahren zur Steuerung einer Empfängerverstärkung |
US8670376B2 (en) | 2008-08-12 | 2014-03-11 | Qualcomm Incorporated | Multi-carrier grant design |
EP2166694A3 (en) * | 2008-09-18 | 2012-01-04 | Samsung Electronics Co., Ltd. | Transmission of sounding reference signals in TDD communication systems |
JP4465020B2 (ja) * | 2008-09-26 | 2010-05-19 | 株式会社エヌ・ティ・ティ・ドコモ | 移動局及び無線基地局 |
KR101557676B1 (ko) | 2008-10-31 | 2015-10-06 | 삼성전자주식회사 | 이동무선 통신시스템의 하향링크 제어채널의 페이로드 크기결정장치 및 방법 |
TWI385672B (zh) * | 2008-11-05 | 2013-02-11 | Lite On It Corp | 儲存裝置之適應性多通道控制器及其方法 |
WO2010062086A2 (ko) * | 2008-11-27 | 2010-06-03 | 엘지전자주식회사 | 무선통신 시스템에서 데이터의 전송장치 및 방법 |
WO2010074472A2 (ko) | 2008-12-22 | 2010-07-01 | (주)엘지전자 | 데이터 프레임을 이용한 데이터 송수신 방법 및 장치 |
US10263744B2 (en) * | 2009-01-29 | 2019-04-16 | Sun Patent Trust | Wireless transmitter and reference signal transmission method |
EP3399821B1 (en) * | 2009-03-12 | 2024-02-28 | Sun Patent Trust | Terminal and method for receiving a downlink control channel in a terminal |
US8773969B1 (en) * | 2009-03-24 | 2014-07-08 | Marvell International Ltd. | Multi-radio device for WLAN |
US10411846B1 (en) | 2009-03-24 | 2019-09-10 | Marvell International Ltd. | Multi-radio device for WLAN |
CN102415005B (zh) * | 2009-08-17 | 2015-04-08 | 上海贝尔股份有限公司 | 在通信网络中用于保持预编码信道相干性的方法及装置 |
CN102014083B (zh) * | 2009-09-08 | 2013-07-10 | 电信科学技术研究院 | 一种信道估计的方法、***和装置 |
US20120294202A1 (en) * | 2010-01-27 | 2012-11-22 | Jin Gon Joung | Method of communication |
US20130051484A1 (en) | 2010-02-15 | 2013-02-28 | Lantiq Deutschland Gmbh | Symbol Generation In Different Multicarrier Systems Operating In Overlapped Frequency Bandwidths |
US8274995B2 (en) * | 2010-05-17 | 2012-09-25 | Telefonaktiebolaget L M Ericsson (Publ) | Cyclic prefix for non-contiguous signal transmission |
US8594216B2 (en) * | 2010-08-25 | 2013-11-26 | Qualcomm Incorporated | Beamforming feedback options for MU-MIMO |
CN102378161B (zh) * | 2010-08-27 | 2015-07-01 | ***通信集团公司 | 用户设备及利用该用户设备确定ta值的方法 |
WO2012058648A2 (en) | 2010-10-29 | 2012-05-03 | Neocific, Inc. | Transmission of synchronization and control signals in a broadband wireless system |
US9178745B2 (en) | 2011-02-04 | 2015-11-03 | Marvell World Trade Ltd. | Control mode PHY for WLAN |
WO2012106635A1 (en) * | 2011-02-04 | 2012-08-09 | Marvell World Trade Ltd. | Control mode phy for wlan |
US8909295B2 (en) * | 2011-02-25 | 2014-12-09 | Fujitsu Limited | Transceiver set selection and communication scheme for a distributed antenna system |
JP5733465B2 (ja) * | 2011-03-31 | 2015-06-10 | 富士通株式会社 | バタフライフィルタの係数設定方法とその装置、受信機、及び受信方法 |
US20130315323A1 (en) * | 2011-04-24 | 2013-11-28 | Broadcom Corporation | Traveling pilots within single user, multiple user, multiple access, and/or MIMO wireless communications |
JP5682536B2 (ja) * | 2011-10-24 | 2015-03-11 | 株式会社Jvcケンウッド | 送信装置、受信装置、送信方法、受信方法 |
KR101275087B1 (ko) * | 2011-10-28 | 2013-06-17 | (주)에프씨아이 | 오에프디엠 수신기 |
CN102611465B (zh) * | 2012-04-07 | 2014-08-06 | 西安电子科技大学 | 结构化多元非规则重复累积码的编码器与编码方法 |
US8896521B2 (en) | 2012-04-24 | 2014-11-25 | Qualcomm Mems Technologies, Inc. | Metal-insulator-metal capacitors on glass substrates |
US10115671B2 (en) | 2012-08-03 | 2018-10-30 | Snaptrack, Inc. | Incorporation of passives and fine pitch through via for package on package |
CN103018721B (zh) * | 2012-12-11 | 2014-06-18 | 电子科技大学 | 一种mimo-oth雷达波形的生成方法 |
JP6522522B2 (ja) | 2013-02-28 | 2019-05-29 | ▲ホア▼▲ウェイ▼技術有限公司Huawei Technologies Co.,Ltd. | データ送信および受信方法およびデバイス |
EP3588817B1 (en) | 2013-05-07 | 2020-12-09 | Lg Electronics Inc. | Method and device for transmitting data unit |
KR101486148B1 (ko) * | 2013-07-10 | 2015-01-26 | 포항공과대학교 산학협력단 | 무선 통신 시스템의 부반송파간 간섭 제거 방법 및 이를 수행하는 장치 |
KR102246117B1 (ko) * | 2013-08-19 | 2021-04-28 | 코히어런트 로직스, 인코포레이티드 | 다중 무선 환경에서 동작하기 위해 파라미터화된 라디오 파형 |
KR102583779B1 (ko) | 2013-09-10 | 2023-10-04 | 마벨 아시아 피티이 엘티디. | 옥외 wlan용 확장 보호 구간 |
JP6464493B2 (ja) | 2013-10-25 | 2019-02-06 | マーベル ワールド トレード リミテッド | WiFi用の距離延長モード |
US10194006B2 (en) | 2013-10-25 | 2019-01-29 | Marvell World Trade Ltd. | Physical layer frame format for WLAN |
US10218822B2 (en) | 2013-10-25 | 2019-02-26 | Marvell World Trade Ltd. | Physical layer frame format for WLAN |
US9755795B2 (en) * | 2013-12-18 | 2017-09-05 | Huawei Technologies Co., Ltd. | System and method for WLAN OFDMA design of subcarrier groups and frame format |
US11309998B2 (en) * | 2014-02-03 | 2022-04-19 | Nxp Usa, Inc. | Hybrid automatic repeat request for wireless local area network |
WO2015161068A1 (en) * | 2014-04-16 | 2015-10-22 | Marvell World Trade Ltd. | Signal field length indication in a high efficiency wireless local area network (wlan) |
JPWO2015162886A1 (ja) * | 2014-04-24 | 2017-04-13 | パナソニック インテレクチュアル プロパティ コーポレーション オブ アメリカPanasonic Intellectual Property Corporation of America | 送信装置 |
US11855818B1 (en) | 2014-04-30 | 2023-12-26 | Marvell Asia Pte Ltd | Adaptive orthogonal frequency division multiplexing (OFDM) numerology in a wireless communication network |
US9954703B2 (en) * | 2014-06-11 | 2018-04-24 | Marvell World Trade Ltd. | Compressed preamble for a wireless communication system |
JP2018503990A (ja) | 2014-08-07 | 2018-02-08 | コーヒレント・ロジックス・インコーポレーテッド | マルチパーティションラジオフレーム |
BR122023024931A2 (pt) * | 2014-08-07 | 2024-01-23 | ONE Media, LLC | Aparelho e método para transmitir um fluxo de transporte de taxa variável |
AU2015328533B2 (en) | 2014-10-08 | 2019-11-21 | Atlas Global Technologies LLC. | System and method for synchronization for OFDMA transmission |
WO2016085379A1 (en) | 2014-11-24 | 2016-06-02 | Telefonaktiebolaget Lm Ericsson (Publ) | Transmission and reception in a determined third set of time-frequency resources |
CN107005519B (zh) | 2014-11-24 | 2021-07-23 | 瑞典爱立信有限公司 | 在无线通信网络中使用预编码多载波调制方案 |
EP3225064B1 (en) | 2014-11-24 | 2020-04-29 | Telefonaktiebolaget LM Ericsson (publ) | Method and device for transmission and reception of time-frequency resources |
US10284403B2 (en) | 2014-11-24 | 2019-05-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Transmission of a signal according to a single- or multi-carrier modulation scheme |
US9918302B2 (en) | 2014-12-12 | 2018-03-13 | Qualcomm Incorporated | Techniques for managing transmissions in an unlicensed radio frequency spectrum band |
CN105790819B (zh) * | 2014-12-25 | 2023-05-19 | 锐迪科(重庆)微电子科技有限公司 | 一种mimo信号接收方法和装置 |
CN107431575B (zh) | 2015-02-17 | 2021-03-02 | 马维尔亚洲私人有限公司 | 用于phy数据单元传输的方法和设备 |
EP3304796B1 (en) * | 2015-06-05 | 2021-07-28 | NXP USA, Inc. | Tone block and spatial stream allocation |
US9935737B2 (en) * | 2015-06-24 | 2018-04-03 | Intel IP Corporation | Access point (AP), user station (STA) and method for spatial modulation orthogonal frequency division multiplexing (SM-OFDM) communication |
WO2017011274A1 (en) * | 2015-07-10 | 2017-01-19 | Interdigital Patent Holdings, Inc. | Methods for resource allocation of an ofdma wlan system |
US10069666B2 (en) * | 2015-07-20 | 2018-09-04 | Telefonaktiebolaget Lm Ericsson (Publ) | Transceiver architecture that maintains legacy timing by inserting and removing cyclic prefix at legacy sampling rate |
DE102015222308A1 (de) * | 2015-11-12 | 2017-05-18 | Volkswagen Aktiengesellschaft | Vorrichtung, Verfahren und Computerprogramm zur Frequenzbandauswahl |
CN112134605B (zh) | 2015-11-13 | 2024-04-09 | 华为技术有限公司 | 数据传输方法和装置 |
WO2017126074A1 (ja) * | 2016-01-21 | 2017-07-27 | 富士通株式会社 | 送信装置、受信装置、無線通信システムおよび処理方法 |
WO2017150813A1 (ko) * | 2016-03-02 | 2017-09-08 | 엘지전자 주식회사 | 무선 통신 시스템에서 제어 채널을 송수신하는 방법 및 이를 지원하는 장치 |
WO2017153699A1 (fr) * | 2016-03-11 | 2017-09-14 | Orange | Procédé et dispositif de transmission multi services avec modulation fc-ofdm et récepteur correspondant |
US9848342B1 (en) * | 2016-07-20 | 2017-12-19 | Ccip, Llc | Excursion compensation in multipath communication systems having performance requirements parameters |
US11032834B2 (en) | 2016-06-20 | 2021-06-08 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Information transmission method and device |
KR101883064B1 (ko) * | 2016-09-21 | 2018-07-27 | 연세대학교 산학협력단 | 무선 통신 시스템에서 하향링크 프리앰블 생성 및 전송 방법 |
DE202017007174U1 (de) | 2016-11-04 | 2019-11-25 | Telefonaktiebolaget Lm Ericsson (Publ) | PT-RS-Konfiguration, die von Planungsparametern abhängt |
US10334515B2 (en) | 2017-01-13 | 2019-06-25 | ENK Wireless, Inc. | Conveying information via auxiliary device selection |
JP2020057825A (ja) | 2017-02-02 | 2020-04-09 | シャープ株式会社 | 基地局装置、端末装置、通信方法、および、集積回路 |
JP2018191033A (ja) * | 2017-04-28 | 2018-11-29 | ルネサスエレクトロニクス株式会社 | 無線送信装置、無線受信装置、及び無線送信方法 |
CN108111272B (zh) | 2017-08-09 | 2021-07-20 | 中兴通讯股份有限公司 | 参考信号配置信息的指示方法、基站及终端 |
JP6554532B2 (ja) * | 2017-12-27 | 2019-07-31 | ▲ホア▼▲ウェイ▼技術有限公司Huawei Technologies Co.,Ltd. | データ送信および受信方法およびデバイス |
US10454664B2 (en) * | 2018-01-12 | 2019-10-22 | Xiao-an Wang | Phase synchronization and channel reciprocity calibration of antennas via terminal feedback |
CN110086591B (zh) * | 2019-05-14 | 2021-10-22 | 鹰潭泰尔物联网研究中心 | 一种大规模天线***中的导频污染抑制方法 |
CN111157964B (zh) * | 2019-12-30 | 2023-02-10 | 西安电子科技大学 | 一种基于奇异值分解的稳健的宽带频域通道校正方法 |
US11411593B2 (en) | 2020-04-29 | 2022-08-09 | Eagle Technology, Llc | Radio frequency (RF) system including programmable processing circuit performing butterfly computations and related methods |
US11502715B2 (en) * | 2020-04-29 | 2022-11-15 | Eagle Technology, Llc | Radio frequency (RF) system including programmable processing circuit performing block coding computations and related methods |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1248370A (zh) * | 1997-02-25 | 2000-03-22 | 诺基亚电信公司 | 利用奇异值分解进行信道脉冲响应估算 |
GB2373973A (en) * | 2001-03-30 | 2002-10-02 | Toshiba Res Europ Ltd | Adaptive OFDM receiver where sets of sub-carriers which are coherent are grouped into sub-bands and a single weight is calculated for each sub-band |
Family Cites Families (544)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4679227A (en) | 1985-05-20 | 1987-07-07 | Telebit Corporation | Ensemble modem structure for imperfect transmission media |
US4736371A (en) | 1985-12-30 | 1988-04-05 | Nec Corporation | Satellite communications system with random multiple access and time slot reservation |
JPH063956Y2 (ja) | 1986-03-14 | 1994-02-02 | 松下電工株式会社 | 電動ガレ−ジ扉 |
US4750198A (en) | 1986-12-12 | 1988-06-07 | Astronet Corporation/Plessey U.K. | Cellular radiotelephone system providing diverse separately-accessible groups of channels |
US4797879A (en) | 1987-06-05 | 1989-01-10 | American Telephone And Telegraph Company At&T Bell Laboratories | Packet switched interconnection protocols for a star configured optical lan |
JPH03104430U (zh) | 1990-02-14 | 1991-10-30 | ||
IL100213A (en) | 1990-12-07 | 1995-03-30 | Qualcomm Inc | Mikrata Kedma phone system and its antenna distribution system |
US5239677A (en) | 1991-07-01 | 1993-08-24 | Motorola, Inc. | Method and apparatus for initiating communication on an assigned frequency |
IT1250515B (it) | 1991-10-07 | 1995-04-08 | Sixtel Spa | Rete per area locale senza fili. |
US5241544A (en) | 1991-11-01 | 1993-08-31 | Motorola, Inc. | Multi-channel tdm communication system slot phase correction |
US5592490A (en) | 1991-12-12 | 1997-01-07 | Arraycomm, Inc. | Spectrally efficient high capacity wireless communication systems |
US6850252B1 (en) | 1999-10-05 | 2005-02-01 | Steven M. Hoffberg | Intelligent electronic appliance system and method |
US5295159A (en) | 1992-04-17 | 1994-03-15 | Bell Communications Research, Inc. | Coordinated coding for digital transmission |
RU2015281C1 (ru) | 1992-09-22 | 1994-06-30 | Борис Михайлович Кондрашов | Запорное устройство |
GB2300337B (en) | 1992-10-05 | 1997-03-26 | Ericsson Ge Mobile Communicat | Digital control channel |
US5404355A (en) | 1992-10-05 | 1995-04-04 | Ericsson Ge Mobile Communications, Inc. | Method for transmitting broadcast information in a digital control channel |
DE69327837T2 (de) | 1992-12-01 | 2000-10-12 | Koninklijke Philips Electronics N.V., Eindhoven | Teilband-Diversityübertragungssystem |
US5471647A (en) | 1993-04-14 | 1995-11-28 | The Leland Stanford Junior University | Method for minimizing cross-talk in adaptive transmission antennas |
US5479447A (en) | 1993-05-03 | 1995-12-26 | The Board Of Trustees Of The Leland Stanford, Junior University | Method and apparatus for adaptive, variable bandwidth, high-speed data transmission of a multicarrier signal over digital subscriber lines |
US5483667A (en) | 1993-07-08 | 1996-01-09 | Northern Telecom Limited | Frequency plan for a cellular network |
DE69423546T2 (de) | 1993-07-09 | 2000-09-21 | Koninklijke Philips Electronics N.V., Eindhoven | Telekommunikationsnetzwerk, Hauptstation und Nebenstation zum Gebrauch in solchem Netzwerk |
ZA946674B (en) | 1993-09-08 | 1995-05-02 | Qualcomm Inc | Method and apparatus for determining the transmission data rate in a multi-user communication system |
US5506861A (en) | 1993-11-22 | 1996-04-09 | Ericsson Ge Mobile Comminications Inc. | System and method for joint demodulation of CDMA signals |
US5490087A (en) | 1993-12-06 | 1996-02-06 | Motorola, Inc. | Radio channel access control |
US5418813A (en) | 1993-12-06 | 1995-05-23 | Motorola, Inc. | Method and apparatus for creating a composite waveform |
US5422733A (en) | 1994-02-04 | 1995-06-06 | Motorola, Inc. | Method and apparatus for facsimile communication of first and second type information with selective call communication systems |
US5491837A (en) | 1994-03-07 | 1996-02-13 | Ericsson Inc. | Method and system for channel allocation using power control and mobile-assisted handover measurements |
US5493712A (en) | 1994-03-23 | 1996-02-20 | At&T Corp. | Fast AGC for TDMA radio systems |
JP3055085B2 (ja) | 1994-04-22 | 2000-06-19 | 株式会社アドバンテスト | デジタル変調解析装置 |
WO1995030316A1 (en) | 1994-05-02 | 1995-11-09 | Motorola Inc. | Multiple subchannel flexible protocol method and apparatus |
US5677909A (en) | 1994-05-11 | 1997-10-14 | Spectrix Corporation | Apparatus for exchanging data between a central station and a plurality of wireless remote stations on a time divided commnication channel |
US6157343A (en) | 1996-09-09 | 2000-12-05 | Telefonaktiebolaget Lm Ericsson | Antenna array calibration |
DE4425713C1 (de) * | 1994-07-20 | 1995-04-20 | Inst Rundfunktechnik Gmbh | Verfahren zur Vielträger Modulation und Demodulation von digital codierten Daten |
FR2724084B1 (fr) | 1994-08-31 | 1997-01-03 | Alcatel Mobile Comm France | Systeme de transmission d'informations par un canal de transmission variant dans le temps, et equipements d'emission et de reception correspondants |
MY120873A (en) | 1994-09-30 | 2005-12-30 | Qualcomm Inc | Multipath search processor for a spread spectrum multiple access communication system |
US5710768A (en) | 1994-09-30 | 1998-01-20 | Qualcomm Incorporated | Method of searching for a bursty signal |
JP3231575B2 (ja) | 1995-04-18 | 2001-11-26 | 三菱電機株式会社 | 無線データ伝送装置 |
KR0155818B1 (ko) | 1995-04-29 | 1998-11-16 | 김광호 | 다중 반송파 전송시스템에서 적응형 전력 분배 방법 및 장치 |
US6018317A (en) | 1995-06-02 | 2000-01-25 | Trw Inc. | Cochannel signal processing system |
US5606729A (en) | 1995-06-21 | 1997-02-25 | Motorola, Inc. | Method and apparatus for implementing a received signal quality measurement in a radio communication system |
US5729542A (en) | 1995-06-28 | 1998-03-17 | Motorola, Inc. | Method and apparatus for communication system access |
US7929498B2 (en) | 1995-06-30 | 2011-04-19 | Interdigital Technology Corporation | Adaptive forward power control and adaptive reverse power control for spread-spectrum communications |
US5638369A (en) | 1995-07-05 | 1997-06-10 | Motorola, Inc. | Method and apparatus for inbound channel selection in a communication system |
DE69535033T2 (de) | 1995-07-11 | 2007-03-08 | Alcatel | Zuweisung von Kapazität bei OFDM |
GB9514659D0 (en) | 1995-07-18 | 1995-09-13 | Northern Telecom Ltd | An antenna downlink beamsteering arrangement |
US5867539A (en) | 1995-07-21 | 1999-02-02 | Hitachi America, Ltd. | Methods and apparatus for reducing the effect of impulse noise on receivers |
FI98674C (fi) | 1995-08-18 | 1997-07-25 | Nokia Mobile Phones Ltd | Menetelmä lähetystehon säätämiseksi yhteydenmuodostuksen aikana sekä solukkoradiojärjestelmä |
JP2802255B2 (ja) * | 1995-09-06 | 1998-09-24 | 株式会社次世代デジタルテレビジョン放送システム研究所 | 直交周波数分割多重伝送方式及びそれを用いる送信装置と受信装置 |
GB9521739D0 (en) | 1995-10-24 | 1996-01-03 | Nat Transcommunications Ltd | Decoding carriers encoded using orthogonal frequency division multiplexing |
US6005876A (en) | 1996-03-08 | 1999-12-21 | At&T Corp | Method and apparatus for mobile data communication |
US5699365A (en) | 1996-03-27 | 1997-12-16 | Motorola, Inc. | Apparatus and method for adaptive forward error correction in data communications |
US5799005A (en) | 1996-04-30 | 1998-08-25 | Qualcomm Incorporated | System and method for determining received pilot power and path loss in a CDMA communication system |
US5924015A (en) | 1996-04-30 | 1999-07-13 | Trw Inc | Power control method and apparatus for satellite based telecommunications system |
JPH09307526A (ja) | 1996-05-17 | 1997-11-28 | Mitsubishi Electric Corp | デジタル放送受信機 |
EP0807989B1 (en) | 1996-05-17 | 2001-06-27 | Motorola Ltd | Devices for transmitter path weights and methods therefor |
JPH09327073A (ja) | 1996-06-07 | 1997-12-16 | N T T Ido Tsushinmo Kk | Cdma移動通信システムにおけるパイロットチャネル配置および送信方法 |
FI101920B (fi) | 1996-06-07 | 1998-09-15 | Nokia Telecommunications Oy | Kanavanvarausmenetelmä pakettiverkkoa varten |
US5822374A (en) | 1996-06-07 | 1998-10-13 | Motorola, Inc. | Method for fine gains adjustment in an ADSL communications system |
US6798735B1 (en) | 1996-06-12 | 2004-09-28 | Aware, Inc. | Adaptive allocation for variable bandwidth multicarrier communication |
US6072779A (en) | 1997-06-12 | 2000-06-06 | Aware, Inc. | Adaptive allocation for variable bandwidth multicarrier communication |
US6097771A (en) | 1996-07-01 | 2000-08-01 | Lucent Technologies Inc. | Wireless communications system having a layered space-time architecture employing multi-element antennas |
JPH1028077A (ja) | 1996-07-11 | 1998-01-27 | Takuro Sato | 通信装置 |
JPH1051402A (ja) | 1996-08-01 | 1998-02-20 | Nec Corp | 受信電界検出回路 |
US6067292A (en) | 1996-08-20 | 2000-05-23 | Lucent Technologies Inc | Pilot interference cancellation for a coherent wireless code division multiple access receiver |
EP0931388B1 (en) | 1996-08-29 | 2003-11-05 | Cisco Technology, Inc. | Spatio-temporal processing for communication |
JP2001359152A (ja) | 2000-06-14 | 2001-12-26 | Sony Corp | 無線通信システム、無線基地局装置、無線移動局装置、無線ゾーン割当て方法及び無線通信方法 |
JP2846860B2 (ja) | 1996-10-01 | 1999-01-13 | ユニデン株式会社 | スペクトル拡散通信方式を用いた送信機、受信機、通信システム及び通信方法 |
US6275543B1 (en) | 1996-10-11 | 2001-08-14 | Arraycomm, Inc. | Method for reference signal generation in the presence of frequency offsets in a communications station with spatial processing |
TW496620U (en) | 1996-10-16 | 2002-07-21 | Behavior Tech Computer Corp | Wireless data transmitting apparatus |
US5886988A (en) | 1996-10-23 | 1999-03-23 | Arraycomm, Inc. | Channel assignment and call admission control for spatial division multiple access communication systems |
US6049548A (en) | 1996-11-22 | 2000-04-11 | Stanford Telecommunications, Inc. | Multi-access CS-P/CD-E system and protocols on satellite channels applicable to a group of mobile users in close proximity |
CA2272930C (en) * | 1996-11-26 | 2003-08-12 | Trw Inc. | Cochannel signal processing system |
US5896376A (en) | 1996-12-13 | 1999-04-20 | Ericsson Inc. | Optimal use of logical channels within a mobile telecommunications network |
US6232918B1 (en) | 1997-01-08 | 2001-05-15 | Us Wireless Corporation | Antenna array calibration in wireless communication systems |
US5912876A (en) * | 1997-01-15 | 1999-06-15 | Ericsson, Inc. | Method and apparatus for channel estimation |
JPH10209956A (ja) | 1997-01-28 | 1998-08-07 | Nippon Telegr & Teleph Corp <Ntt> | 無線パケット通信方法 |
US6128276A (en) | 1997-02-24 | 2000-10-03 | Radix Wireless, Inc. | Stacked-carrier discrete multiple tone communication technology and combinations with code nulling, interference cancellation, retrodirective communication and adaptive antenna arrays |
JPH10303794A (ja) | 1997-02-27 | 1998-11-13 | Mitsubishi Electric Corp | 既知系列検出器 |
US6084915A (en) | 1997-03-03 | 2000-07-04 | 3Com Corporation | Signaling method having mixed-base shell map indices |
US6175550B1 (en) * | 1997-04-01 | 2001-01-16 | Lucent Technologies, Inc. | Orthogonal frequency division multiplexing system with dynamically scalable operating parameters and method thereof |
KR100267856B1 (ko) | 1997-04-16 | 2000-10-16 | 윤종용 | 이동통신시스템에서오버헤드채널관리방법및장치 |
US6308080B1 (en) | 1997-05-16 | 2001-10-23 | Texas Instruments Incorporated | Power control in point-to-multipoint systems |
US6347217B1 (en) | 1997-05-22 | 2002-02-12 | Telefonaktiebolaget Lm Ericsson (Publ) | Link quality reporting using frame erasure rates |
US6008760A (en) | 1997-05-23 | 1999-12-28 | Genghis Comm | Cancellation system for frequency reuse in microwave communications |
FR2764143A1 (fr) | 1997-05-27 | 1998-12-04 | Philips Electronics Nv | Procede de determination d'un format d'emission de symboles dans un systeme de transmission et systeme |
US6141555A (en) | 1997-06-09 | 2000-10-31 | Nec Corporation | Cellular communication system, and mobile and base stations used in the same |
US5867478A (en) | 1997-06-20 | 1999-02-02 | Motorola, Inc. | Synchronous coherent orthogonal frequency division multiplexing system, method, software and device |
US6067458A (en) | 1997-07-01 | 2000-05-23 | Qualcomm Incorporated | Method and apparatus for pre-transmission power control using lower rate for high rate communication |
US6108369A (en) | 1997-07-11 | 2000-08-22 | Telefonaktiebolaget Lm Ericsson | Channelization code allocation for radio communication systems |
US6333953B1 (en) | 1997-07-21 | 2001-12-25 | Ericsson Inc. | System and methods for selecting an appropriate detection technique in a radiocommunication system |
EP0895387A1 (de) | 1997-07-28 | 1999-02-03 | Deutsche Thomson-Brandt Gmbh | Erkennung des Übertragungsmodus eines DVB-Signales |
US6141542A (en) | 1997-07-31 | 2000-10-31 | Motorola, Inc. | Method and apparatus for controlling transmit diversity in a communication system |
CN1086061C (zh) | 1997-08-12 | 2002-06-05 | 鸿海精密工业股份有限公司 | 电连接器的固持装置 |
EP0899896A1 (de) | 1997-08-27 | 1999-03-03 | Siemens Aktiengesellschaft | Verfahren und Einrichtung zur Schätzung räumlicher Parameter von Überstragungskanälen |
US6131016A (en) | 1997-08-27 | 2000-10-10 | At&T Corp | Method and apparatus for enhancing communication reception at a wireless communication terminal |
JP2991167B2 (ja) | 1997-08-27 | 1999-12-20 | 三菱電機株式会社 | Tdma可変スロット割当方法 |
US6167031A (en) | 1997-08-29 | 2000-12-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for selecting a combination of modulation and channel coding schemes in a digital communication system |
BR9812816A (pt) | 1997-09-15 | 2000-08-08 | Adaptive Telecom Inc | Processos para comunicação sem fio, e para eficientemente determinar na estação base um canal espacial da unidade móvel em um sistema de comunicação sem fio, e, estação base de cdma |
US6389000B1 (en) | 1997-09-16 | 2002-05-14 | Qualcomm Incorporated | Method and apparatus for transmitting and receiving high speed data in a CDMA communication system using multiple carriers |
US6590928B1 (en) | 1997-09-17 | 2003-07-08 | Telefonaktiebolaget Lm Ericsson (Publ) | Frequency hopping piconets in an uncoordinated wireless multi-user system |
AUPO932297A0 (en) | 1997-09-19 | 1997-10-09 | Commonwealth Scientific And Industrial Research Organisation | Medium access control protocol for data communications |
KR100234329B1 (ko) | 1997-09-30 | 1999-12-15 | 윤종용 | Ofdm 시스템 수신기의 fft 윈도우 위치 복원장치 및 그 방법_ |
US6178196B1 (en) | 1997-10-06 | 2001-01-23 | At&T Corp. | Combined interference cancellation and maximum likelihood decoding of space-time block codes |
US6574211B2 (en) | 1997-11-03 | 2003-06-03 | Qualcomm Incorporated | Method and apparatus for high rate packet data transmission |
US6377812B1 (en) | 1997-11-20 | 2002-04-23 | University Of Maryland | Combined power control and space-time diversity in mobile cellular communications |
US6122247A (en) | 1997-11-24 | 2000-09-19 | Motorola Inc. | Method for reallocating data in a discrete multi-tone communication system |
JPH11163823A (ja) | 1997-11-26 | 1999-06-18 | Victor Co Of Japan Ltd | 直交周波数分割多重信号伝送方法、送信装置及び受信装置 |
US5936569A (en) | 1997-12-02 | 1999-08-10 | Nokia Telecommunications Oy | Method and arrangement for adjusting antenna pattern |
US6154661A (en) | 1997-12-10 | 2000-11-28 | Arraycomm, Inc. | Transmitting on the downlink using one or more weight vectors determined to achieve a desired radiation pattern |
US6084917A (en) | 1997-12-16 | 2000-07-04 | Integrated Telecom Express | Circuit for configuring and dynamically adapting data and energy parameters in a multi-channel communications system |
US5929810A (en) | 1997-12-19 | 1999-07-27 | Northrop Grumman Corporation | In-flight antenna optimization |
US6175588B1 (en) | 1997-12-30 | 2001-01-16 | Motorola, Inc. | Communication device and method for interference suppression using adaptive equalization in a spread spectrum communication system |
US6088387A (en) | 1997-12-31 | 2000-07-11 | At&T Corp. | Multi-channel parallel/serial concatenated convolutional codes and trellis coded modulation encoder/decoder |
EP2254301B1 (en) * | 1998-01-06 | 2013-06-19 | Mosaid Technologies Incorporated | Multicarrier modulation system with variable symbol rates |
JP3724940B2 (ja) | 1998-01-08 | 2005-12-07 | 株式会社東芝 | Ofdmダイバーシチ受信装置 |
US5982327A (en) | 1998-01-12 | 1999-11-09 | Motorola, Inc. | Adaptive array method, device, base station and subscriber unit |
US6608874B1 (en) | 1998-01-12 | 2003-08-19 | Hughes Electronics Corporation | Method and apparatus for quadrature multi-pulse modulation of data for spectrally efficient communication |
EP0930752A3 (en) | 1998-01-14 | 1999-10-20 | Motorola, Inc. | Method for allocating data and power in a discrete multitone communication system |
US5973638A (en) | 1998-01-30 | 1999-10-26 | Micronetics Wireless, Inc. | Smart antenna channel simulator and test system |
US7787514B2 (en) * | 1998-02-12 | 2010-08-31 | Lot 41 Acquisition Foundation, Llc | Carrier interferometry coding with applications to cellular and local area networks |
EP0938208A1 (en) * | 1998-02-22 | 1999-08-25 | Sony International (Europe) GmbH | Multicarrier transmission, compatible with the existing GSM system |
AU2754899A (en) | 1998-02-27 | 1999-09-15 | Telefonaktiebolaget Lm Ericsson (Publ) | Multiple access categorization for mobile station |
JP3082756B2 (ja) | 1998-02-27 | 2000-08-28 | 日本電気株式会社 | マルチキャリア伝送システム及びその方法 |
US6141388A (en) | 1998-03-11 | 2000-10-31 | Ericsson Inc. | Received signal quality determination method and systems for convolutionally encoded communication channels |
US6058107A (en) | 1998-04-08 | 2000-05-02 | Motorola, Inc. | Method for updating forward power control in a communication system |
US6317466B1 (en) | 1998-04-15 | 2001-11-13 | Lucent Technologies Inc. | Wireless communications system having a space-time architecture employing multi-element antennas at both the transmitter and receiver |
US6615024B1 (en) | 1998-05-01 | 2003-09-02 | Arraycomm, Inc. | Method and apparatus for determining signatures for calibrating a communication station having an antenna array |
US7123628B1 (en) | 1998-05-06 | 2006-10-17 | Lg Electronics Inc. | Communication system with improved medium access control sub-layer |
JP3286247B2 (ja) | 1998-05-08 | 2002-05-27 | 松下電器産業株式会社 | 無線通信システム |
US6205410B1 (en) | 1998-06-01 | 2001-03-20 | Globespan Semiconductor, Inc. | System and method for bit loading with optimal margin assignment |
BR9911381A (pt) | 1998-06-19 | 2001-03-13 | Ericsson Telefon Ab L M | Processo para sincronizar a uma estrutura de quadro associada com informação transmitida por um sistema de radiocomunicação, e, estação móvel. |
US6795424B1 (en) * | 1998-06-30 | 2004-09-21 | Tellabs Operations, Inc. | Method and apparatus for interference suppression in orthogonal frequency division multiplexed (OFDM) wireless communication systems |
JP2000092009A (ja) | 1998-07-13 | 2000-03-31 | Sony Corp | 通信方法、送信機及び受信機 |
JP3449985B2 (ja) | 1998-07-16 | 2003-09-22 | サムスン エレクトロニクス カンパニー リミテッド | 移動通信システムのパケットデータ処理システム及び方法 |
US6154443A (en) | 1998-08-11 | 2000-11-28 | Industrial Technology Research Institute | FFT-based CDMA RAKE receiver system and method |
US6594620B1 (en) | 1998-08-17 | 2003-07-15 | Aspen Technology, Inc. | Sensor validation apparatus and method |
WO2000011823A1 (en) | 1998-08-18 | 2000-03-02 | Beamreach Networks, Inc. | Stacked-carrier discrete multiple tone communication technology |
KR100429540B1 (ko) | 1998-08-26 | 2004-08-09 | 삼성전자주식회사 | 이동통신시스템의패킷데이터통신장치및방법 |
US6515617B1 (en) | 1998-09-01 | 2003-02-04 | Hughes Electronics Corporation | Method and system for position determination using geostationary earth orbit satellite |
DE19842712C1 (de) | 1998-09-17 | 2000-05-04 | Siemens Ag | Verfahren und Anordnung zur Minimierung des Autokorrelationsfehlers bei der Demodulation eines Spreizspektrum-Signals unter Mehrwegeausbreitung |
US6292917B1 (en) | 1998-09-30 | 2001-09-18 | Agere Systems Guardian Corp. | Unequal error protection for digital broadcasting using channel classification |
EP0993211B1 (en) | 1998-10-05 | 2005-01-12 | Sony International (Europe) GmbH | Random access channel partitioning scheme for CDMA system |
DE69834639T2 (de) | 1998-10-05 | 2006-12-14 | Sony Deutschland Gmbh | Automatische Bestimmung des Punkts für Direktzugriffs-Kanalaufteilungsverfahren |
US6711121B1 (en) | 1998-10-09 | 2004-03-23 | At&T Corp. | Orthogonal code division multiplexing for twisted pair channels |
EP1108317B1 (de) | 1998-10-27 | 2002-08-28 | Siemens Aktiengesellschaft | Kanalzuweisungsverfahren und vorrichtung für kodierte und kombinierte informationssätze |
JP4287536B2 (ja) | 1998-11-06 | 2009-07-01 | パナソニック株式会社 | Ofdm送受信装置及びofdm送受信方法 |
JP3464981B2 (ja) | 1998-12-03 | 2003-11-10 | フラウンホーファー−ゲゼルシャフト・ツール・フェルデルング・デル・アンゲヴァンテン・フォルシュング・アインゲトラーゲネル・フェライン | 情報送信装置及びその方法並びに情報受信装置及びその方法 |
GB9827182D0 (en) | 1998-12-10 | 1999-02-03 | Philips Electronics Nv | Radio communication system |
FI108588B (fi) | 1998-12-15 | 2002-02-15 | Nokia Corp | Menetelmä ja radiojärjestelmä digitaalisen signaalin siirtoon |
JP2000244441A (ja) * | 1998-12-22 | 2000-09-08 | Matsushita Electric Ind Co Ltd | Ofdm送受信装置 |
US6266528B1 (en) | 1998-12-23 | 2001-07-24 | Arraycomm, Inc. | Performance monitor for antenna arrays |
US6310909B1 (en) | 1998-12-23 | 2001-10-30 | Broadcom Corporation | DSL rate adaptation |
US6463290B1 (en) | 1999-01-08 | 2002-10-08 | Trueposition, Inc. | Mobile-assisted network based techniques for improving accuracy of wireless location system |
US6348036B1 (en) | 1999-01-24 | 2002-02-19 | Genzyme Corporation | Surgical retractor and tissue stabilization device |
RU2152132C1 (ru) | 1999-01-26 | 2000-06-27 | Государственное унитарное предприятие Воронежский научно-исследовательский институт связи | Линия радиосвязи с пространственной модуляцией |
JP3619729B2 (ja) | 2000-01-19 | 2005-02-16 | 松下電器産業株式会社 | 無線受信装置および無線受信方法 |
KR100651457B1 (ko) | 1999-02-13 | 2006-11-28 | 삼성전자주식회사 | 부호분할다중접속 이동통신시스템의 불연속 전송모드에서 연속적인 외부순환 전력제어장치 및 방법 |
US6169759B1 (en) | 1999-03-22 | 2001-01-02 | Golden Bridge Technology | Common packet channel |
US6574267B1 (en) | 1999-03-22 | 2003-06-03 | Golden Bridge Technology, Inc. | Rach ramp-up acknowledgement |
US6363267B1 (en) | 1999-04-07 | 2002-03-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobile terminal decode failure procedure in a wireless local area network |
US6346910B1 (en) | 1999-04-07 | 2002-02-12 | Tei Ito | Automatic array calibration scheme for wireless point-to-multipoint communication networks |
JP4435991B2 (ja) | 1999-04-12 | 2010-03-24 | サムスン エレクトロニクス カンパニー リミテッド | 符号分割多重接続通信システムの断続送信装置及び方法 |
EP1075093A1 (en) | 1999-08-02 | 2001-02-07 | Interuniversitair Micro-Elektronica Centrum Vzw | A method and apparatus for multi-user transmission |
US6594798B1 (en) | 1999-05-21 | 2003-07-15 | Microsoft Corporation | Receiver-driven layered error correction multicast over heterogeneous packet networks |
US6532562B1 (en) | 1999-05-21 | 2003-03-11 | Microsoft Corp | Receiver-driven layered error correction multicast over heterogeneous packet networks |
US6594473B1 (en) | 1999-05-28 | 2003-07-15 | Texas Instruments Incorporated | Wireless system with transmitter having multiple transmit antennas and combining open loop and closed loop transmit diversities |
KR100605978B1 (ko) | 1999-05-29 | 2006-07-28 | 삼성전자주식회사 | 부호분할다중접속 이동통신시스템의 불연속 전송모드에서 연속적인 외부순환 전력제어를 위한 송수신 장치 및 방법 |
US7072410B1 (en) | 1999-06-01 | 2006-07-04 | Peter Monsen | Multiple access system and method for multibeam digital radio systems |
US6141567A (en) | 1999-06-07 | 2000-10-31 | Arraycomm, Inc. | Apparatus and method for beamforming in a changing-interference environment |
US6385264B1 (en) | 1999-06-08 | 2002-05-07 | Qualcomm Incorporated | Method and apparatus for mitigating interference between base stations in a wideband CDMA system |
US6976262B1 (en) | 1999-06-14 | 2005-12-13 | Sun Microsystems, Inc. | Web-based enterprise management with multiple repository capability |
CA2341577C (en) | 1999-07-08 | 2005-01-11 | Samsung Electronics Co., Ltd. | Data rate detection device and method for a mobile communication system |
US6163296A (en) | 1999-07-12 | 2000-12-19 | Lockheed Martin Corp. | Calibration and integrated beam control/conditioning system for phased-array antennas |
RU2168278C2 (ru) | 1999-07-16 | 2001-05-27 | Корпорация "Самсунг Электроникс" | Способ произвольного доступа абонентов мобильной станции |
US6532225B1 (en) | 1999-07-27 | 2003-03-11 | At&T Corp | Medium access control layer for packetized wireless systems |
US6067290A (en) | 1999-07-30 | 2000-05-23 | Gigabit Wireless, Inc. | Spatial multiplexing in a cellular network |
JP2001044930A (ja) | 1999-07-30 | 2001-02-16 | Matsushita Electric Ind Co Ltd | 無線通信装置および無線通信方法 |
US7027464B1 (en) * | 1999-07-30 | 2006-04-11 | Matsushita Electric Industrial Co., Ltd. | OFDM signal transmission scheme, and OFDM signal transmitter/receiver |
US6721339B2 (en) | 1999-08-17 | 2004-04-13 | Lucent Technologies Inc. | Method of providing downlink transmit diversity |
US6735188B1 (en) | 1999-08-27 | 2004-05-11 | Tachyon, Inc. | Channel encoding and decoding method and apparatus |
US6115406A (en) | 1999-09-10 | 2000-09-05 | Interdigital Technology Corporation | Transmission using an antenna array in a CDMA communication system |
US6278726B1 (en) | 1999-09-10 | 2001-08-21 | Interdigital Technology Corporation | Interference cancellation in a spread spectrum communication system |
US6426971B1 (en) | 1999-09-13 | 2002-07-30 | Qualcomm Incorporated | System and method for accurately predicting signal to interference and noise ratio to improve communications system performance |
SG80071A1 (en) | 1999-09-24 | 2001-04-17 | Univ Singapore | Downlink beamforming method |
JP3421671B2 (ja) | 1999-09-30 | 2003-06-30 | 独立行政法人通信総合研究所 | 通信システム、選択装置、送信装置、受信装置、選択方法、送信方法、受信方法、および、情報記録媒体 |
US7006482B1 (en) | 1999-10-02 | 2006-02-28 | Samsung Electronics Co., Ltd. | Apparatus and method for gating data on a control channel in a CDMA communication system |
DE19950005A1 (de) | 1999-10-18 | 2001-04-19 | Bernhard Walke | Verfahren zum Betrieb drahtloser Basisstationen für paketvermittelnde Funksysteme mit garantierter Dienstgüte |
DE19951525C2 (de) | 1999-10-26 | 2002-01-24 | Siemens Ag | Verfahren zum Kalibrieren einer elektronisch phasengesteuerten Gruppenantenne in Funk-Kommunikationssystemen |
US6492942B1 (en) | 1999-11-09 | 2002-12-10 | Com Dev International, Inc. | Content-based adaptive parasitic array antenna system |
JP3416597B2 (ja) | 1999-11-19 | 2003-06-16 | 三洋電機株式会社 | 無線基地局 |
US7088671B1 (en) | 1999-11-24 | 2006-08-08 | Peter Monsen | Multiple access technique for downlink multibeam digital radio systems |
US7110785B1 (en) | 1999-12-03 | 2006-09-19 | Nortel Networks Limited | Performing power control in a mobile communications system |
US6298092B1 (en) | 1999-12-15 | 2001-10-02 | Iospan Wireless, Inc. | Methods of controlling communication parameters of wireless systems |
US6351499B1 (en) | 1999-12-15 | 2002-02-26 | Iospan Wireless, Inc. | Method and wireless systems using multiple antennas and adaptive control for maximizing a communication parameter |
EP1109326A1 (en) | 1999-12-15 | 2001-06-20 | Lucent Technologies Inc. | Peamble detector for a CDMA receiver |
JP3975629B2 (ja) | 1999-12-16 | 2007-09-12 | ソニー株式会社 | 画像復号装置及び画像復号方法 |
US6298035B1 (en) | 1999-12-21 | 2001-10-02 | Nokia Networks Oy | Estimation of two propagation channels in OFDM |
JP2001186051A (ja) | 1999-12-24 | 2001-07-06 | Toshiba Corp | データ信号判定回路及び方法 |
KR100467543B1 (ko) | 1999-12-28 | 2005-01-24 | 엔티티 도꼬모 인코퍼레이티드 | 채널추정 방법 및 통신장치 |
US6718160B2 (en) | 1999-12-29 | 2004-04-06 | Airnet Communications Corp. | Automatic configuration of backhaul and groundlink frequencies in a wireless repeater |
US6888809B1 (en) | 2000-01-13 | 2005-05-03 | Lucent Technologies Inc. | Space-time processing for multiple-input, multiple-output, wireless systems |
US7254171B2 (en) | 2000-01-20 | 2007-08-07 | Nortel Networks Limited | Equaliser for digital communications systems and method of equalisation |
JP3581072B2 (ja) | 2000-01-24 | 2004-10-27 | 株式会社エヌ・ティ・ティ・ドコモ | チャネル構成方法及びその方法を利用する基地局 |
KR100325367B1 (ko) | 2000-01-28 | 2002-03-04 | 박태진 | 직교 주파수 분할 다중 통신 시스템에서의 비트 오율 측정장치및 방법 |
JP2001217896A (ja) | 2000-01-31 | 2001-08-10 | Matsushita Electric Works Ltd | 無線データ通信システム |
US7003044B2 (en) | 2000-02-01 | 2006-02-21 | Sasken Communication Technologies Ltd. | Method for allocating bits and power in multi-carrier communication system |
FI117465B (fi) | 2000-02-03 | 2006-10-31 | Danisco Sweeteners Oy | Menetelmä pureskeltavien ytimien kovapinnoittamiseksi |
US6868120B2 (en) | 2000-02-08 | 2005-03-15 | Clearwire Corporation | Real-time system for measuring the Ricean K-factor |
US6704374B1 (en) | 2000-02-16 | 2004-03-09 | Thomson Licensing S.A. | Local oscillator frequency correction in an orthogonal frequency division multiplexing system |
DE10008653A1 (de) | 2000-02-24 | 2001-09-06 | Siemens Ag | Verbesserungen an einem Funkkommunikationssystem |
US6956814B1 (en) | 2000-02-29 | 2005-10-18 | Worldspace Corporation | Method and apparatus for mobile platform reception and synchronization in direct digital satellite broadcast system |
JP2001244879A (ja) | 2000-03-02 | 2001-09-07 | Matsushita Electric Ind Co Ltd | 送信電力制御装置及びその方法 |
US6963546B2 (en) | 2000-03-15 | 2005-11-08 | Interdigital Technology Corp. | Multi-user detection using an adaptive combination of joint detection and successive interface cancellation |
EP1137217A1 (en) | 2000-03-20 | 2001-09-26 | Telefonaktiebolaget Lm Ericsson | ARQ parameter negociation in a data packet transmission system using link adaptation |
US7149253B2 (en) | 2000-03-21 | 2006-12-12 | Texas Instruments Incorporated | Wireless communication |
US20020154705A1 (en) | 2000-03-22 | 2002-10-24 | Walton Jay R. | High efficiency high performance communications system employing multi-carrier modulation |
US6952454B1 (en) | 2000-03-22 | 2005-10-04 | Qualcomm, Incorporated | Multiplexing of real time services and non-real time services for OFDM systems |
US6473467B1 (en) | 2000-03-22 | 2002-10-29 | Qualcomm Incorporated | Method and apparatus for measuring reporting channel state information in a high efficiency, high performance communications system |
DE10014676C2 (de) | 2000-03-24 | 2002-02-07 | Polytrax Inf Technology Ag | Datenübertragung über ein Stromversorgungsnetz |
US7113499B2 (en) | 2000-03-29 | 2006-09-26 | Texas Instruments Incorporated | Wireless communication |
EP1843622B1 (en) | 2000-04-04 | 2009-12-30 | Sony Deutschland Gmbh | Event triggered change of access service class in a random access channel |
US7403748B1 (en) | 2000-04-07 | 2008-07-22 | Nokia Coporation | Multi-antenna transmission method and system |
US7289570B2 (en) | 2000-04-10 | 2007-10-30 | Texas Instruments Incorporated | Wireless communications |
US6757263B1 (en) | 2000-04-13 | 2004-06-29 | Motorola, Inc. | Wireless repeating subscriber units |
SE518028C2 (sv) | 2000-04-17 | 2002-08-20 | Ericsson Telefon Ab L M | Förfarande och metod för att undvika överbelastning i ett cellulärt radiosystem med makrodiversitet |
ATE357802T1 (de) | 2000-04-18 | 2007-04-15 | Aware Inc | Datenzuweisung mit änderbaren signal- rauschabstand |
US6751199B1 (en) | 2000-04-24 | 2004-06-15 | Qualcomm Incorporated | Method and apparatus for a rate control in a high data rate communication system |
ATE311708T1 (de) | 2000-04-25 | 2005-12-15 | Nortel Networks Ltd | Drahtloses telekommunikationssystem mit einer reduzierten verzögerung für die datenübermittlung |
US7068628B2 (en) | 2000-05-22 | 2006-06-27 | At&T Corp. | MIMO OFDM system |
EP1158695B1 (en) | 2000-05-23 | 2008-08-06 | NTT DoCoMo, Inc. | Space multiplex radio communication method and apparatus |
US7139324B1 (en) | 2000-06-02 | 2006-11-21 | Nokia Networks Oy | Closed loop feedback system for improved down link performance |
US6744811B1 (en) | 2000-06-12 | 2004-06-01 | Actelis Networks Inc. | Bandwidth management for DSL modem pool |
WO2001097411A1 (en) | 2000-06-12 | 2001-12-20 | Samsung Electronics Co., Ltd | Method of assigning an uplink random access channel in a cdma mobile communication system |
US7248841B2 (en) | 2000-06-13 | 2007-07-24 | Agee Brian G | Method and apparatus for optimization of wireless multipoint electromagnetic communication networks |
US6628702B1 (en) | 2000-06-14 | 2003-09-30 | Qualcomm, Incorporated | Method and apparatus for demodulating signals processed in a transmit diversity mode |
US6317467B1 (en) | 2000-06-14 | 2001-11-13 | Lloyd C. Cox | Beamforming and interference cancellation system using general purpose filter architecture |
US6760313B1 (en) | 2000-06-19 | 2004-07-06 | Qualcomm Incorporated | Method and apparatus for adaptive rate selection in a communication system |
SE519303C2 (sv) | 2000-06-20 | 2003-02-11 | Ericsson Telefon Ab L M | Anordning för smalbandig kommunikation i ett multicarrier- system |
US6891858B1 (en) | 2000-06-30 | 2005-05-10 | Cisco Technology Inc. | Dynamic modulation of modulation profiles for communication channels in an access network |
AU2001255253A1 (en) | 2000-06-30 | 2002-01-14 | Iospan Wireless, Inc. | Method and system for mode adaptation in wireless communication |
CN1140147C (zh) | 2000-07-01 | 2004-02-25 | ***电信传输研究所 | 一种外环功率控制的方法和*** |
DE60117263T2 (de) | 2000-07-03 | 2006-07-27 | Matsushita Electric Industrial Co., Ltd., Kadoma | Basisstationseinheit und verfahren zur funkkommunikation |
JP3583353B2 (ja) | 2000-07-03 | 2004-11-04 | 松下電器産業株式会社 | 通信端末装置および基地局装置 |
KR100627188B1 (ko) | 2000-07-04 | 2006-09-22 | 에스케이 텔레콤주식회사 | 무선통신 역방향 동기 방식에서의 코드 할당 방법 |
EP2262151B1 (en) * | 2000-07-05 | 2017-10-04 | Sony Deutschland Gmbh | Pilot pattern design for multiple antennas in an OFDM system |
EP1299978B1 (en) | 2000-07-12 | 2018-10-03 | Qualcomm Incorporated | Multiplexing of real time services and non-real time services for ofdm systems |
FI109393B (fi) | 2000-07-14 | 2002-07-15 | Nokia Corp | Menetelmä mediavirran enkoodaamiseksi skaalautuvasti, skaalautuva enkooderi ja päätelaite |
KR100834019B1 (ko) | 2000-07-17 | 2008-06-02 | 코닌클리케 필립스 일렉트로닉스 엔.브이. | 인코딩된 데이터 스트림을 송신하기 위한 방법과 송신기 및 인코딩된 데이터 스트림을 수신하기 위한 방법과 수신기 |
KR100493152B1 (ko) | 2000-07-21 | 2005-06-02 | 삼성전자주식회사 | 이동 통신 시스템에서의 전송 안테나 다이버시티 방법 및이를 위한 기지국 장치 및 이동국 장치 |
EP1176750A1 (en) | 2000-07-25 | 2002-01-30 | Telefonaktiebolaget L M Ericsson (Publ) | Link quality determination of a transmission link in an OFDM transmission system |
DE60035683T2 (de) | 2000-08-01 | 2008-06-26 | Sony Deutschland Gmbh | Frequenzwiederverwendungsschema für OFDM-Systeme |
US6721267B2 (en) * | 2000-08-01 | 2004-04-13 | Motorola, Inc. | Time and bandwidth scalable slot format for mobile data system |
US6920192B1 (en) | 2000-08-03 | 2005-07-19 | Lucent Technologies Inc. | Adaptive antenna array methods and apparatus for use in a multi-access wireless communication system |
AU2001284723A1 (en) | 2000-08-03 | 2002-02-18 | Morphics Technology, Inc. | Dynamically reconfigurable universal transmitter system |
US6582088B2 (en) | 2000-08-10 | 2003-06-24 | Benq Corporation | Optical path folding apparatus |
DE60037465T2 (de) | 2000-08-10 | 2008-12-04 | Fujitsu Ltd., Kawasaki | Vorrichtung zur Kommunikation mit Diversität |
KR100617749B1 (ko) | 2000-08-16 | 2006-08-28 | 삼성전자주식회사 | 이동통신 시스템에서 쥐피에스 신호를 이용한 기지국안테나 어레이장치 및 송수신 빔 형성 방법 |
EP1182799A3 (en) | 2000-08-22 | 2002-06-26 | Lucent Technologies Inc. | Method for enhancing mobile cdma communications using space-time transmit diversity |
KR100526499B1 (ko) | 2000-08-22 | 2005-11-08 | 삼성전자주식회사 | 두 개 이상 안테나를 사용하는 안테나 전송 다이버시티방법 및 장치 |
IT1318790B1 (it) | 2000-08-29 | 2003-09-10 | Cit Alcatel | Metodo per gestire il cambio di allocazione dei time-slot in reti adanello ms-spring di tipo transoceanico. |
US7120657B2 (en) | 2000-08-29 | 2006-10-10 | Science Applications International Corporation | System and method for adaptive filtering |
JP3886709B2 (ja) | 2000-08-29 | 2007-02-28 | 三菱電機株式会社 | スペクトル拡散受信装置 |
US6937592B1 (en) | 2000-09-01 | 2005-08-30 | Intel Corporation | Wireless communications system that supports multiple modes of operation |
US7233625B2 (en) | 2000-09-01 | 2007-06-19 | Nortel Networks Limited | Preamble design for multiple input—multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system |
US7009931B2 (en) | 2000-09-01 | 2006-03-07 | Nortel Networks Limited | Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications |
US6850481B2 (en) | 2000-09-01 | 2005-02-01 | Nortel Networks Limited | Channels estimation for multiple input—multiple output, orthogonal frequency division multiplexing (OFDM) system |
JP2002077098A (ja) | 2000-09-01 | 2002-03-15 | Mitsubishi Electric Corp | 通信装置および通信方法 |
US6985434B2 (en) | 2000-09-01 | 2006-01-10 | Nortel Networks Limited | Adaptive time diversity and spatial diversity for OFDM |
FR2814014B1 (fr) | 2000-09-14 | 2002-10-11 | Mitsubishi Electric Inf Tech | Methode de detection multi-utilisateur |
US6802035B2 (en) * | 2000-09-19 | 2004-10-05 | Intel Corporation | System and method of dynamically optimizing a transmission mode of wirelessly transmitted information |
US6760882B1 (en) * | 2000-09-19 | 2004-07-06 | Intel Corporation | Mode selection for data transmission in wireless communication channels based on statistical parameters |
US6956897B1 (en) | 2000-09-27 | 2005-10-18 | Northwestern University | Reduced rank adaptive filter |
US6650714B2 (en) | 2000-11-30 | 2003-11-18 | Arraycomm, Inc. | Spatial processing and timing estimation using a training sequence in a radio communications system |
US7062294B1 (en) | 2000-09-29 | 2006-06-13 | Arraycomm, Llc. | Downlink transmission in a wireless data communication system having a base station with a smart antenna system |
US7043259B1 (en) | 2000-09-29 | 2006-05-09 | Arraycomm, Inc. | Repetitive paging from a wireless data base station having a smart antenna system |
US7110378B2 (en) | 2000-10-03 | 2006-09-19 | Wisconsin Alumni Research Foundation | Channel aware optimal space-time signaling for wireless communication over wideband multipath channels |
US7016296B2 (en) | 2000-10-16 | 2006-03-21 | Broadcom Corporation | Adaptive modulation for fixed wireless link in cable transmission system |
US6907270B1 (en) | 2000-10-23 | 2005-06-14 | Qualcomm Inc. | Method and apparatus for reduced rank channel estimation in a communications system |
JP4067755B2 (ja) * | 2000-10-24 | 2008-03-26 | 三菱電機株式会社 | スペクトラム拡散通信システムの受信機 |
US6369758B1 (en) | 2000-11-01 | 2002-04-09 | Unique Broadband Systems, Inc. | Adaptive antenna array for mobile communication |
JP3553038B2 (ja) | 2000-11-06 | 2004-08-11 | 株式会社エヌ・ティ・ティ・ドコモ | 信号送信方法、信号受信方法、送信装置、受信装置および記録媒体 |
US6768727B1 (en) | 2000-11-09 | 2004-07-27 | Ericsson Inc. | Fast forward link power control for CDMA system |
US8634481B1 (en) | 2000-11-16 | 2014-01-21 | Alcatel Lucent | Feedback technique for wireless systems with multiple transmit and receive antennas |
US7006464B1 (en) | 2000-11-17 | 2006-02-28 | Lucent Technologies Inc. | Downlink and uplink channel structures for downlink shared channel system |
US6980601B2 (en) | 2000-11-17 | 2005-12-27 | Broadcom Corporation | Rate adaptation and parameter optimization for multi-band single carrier transmission |
JP3695316B2 (ja) | 2000-11-24 | 2005-09-14 | 株式会社日本自動車部品総合研究所 | スペクトラム拡散受信機の相関検出器 |
US8019068B2 (en) | 2000-12-01 | 2011-09-13 | Alcatel Lucent | Method of allocating power for the simultaneous downlink conveyance of information between multiple antennas and multiple destinations |
US6751480B2 (en) | 2000-12-01 | 2004-06-15 | Lucent Technologies Inc. | Method for simultaneously conveying information to multiple mobiles with multiple antennas |
JP4505677B2 (ja) | 2000-12-06 | 2010-07-21 | ソフトバンクテレコム株式会社 | 送信ダイバーシチ装置および送信電力調整方法 |
US6952426B2 (en) | 2000-12-07 | 2005-10-04 | Nortel Networks Limited | Method and apparatus for the transmission of short data bursts in CDMA/HDR networks |
KR100353641B1 (ko) | 2000-12-21 | 2002-09-28 | 삼성전자 주식회사 | 부호분할다중접속 이동통신시스템의 기지국 전송 안테나다이버시티 장치 및 방법 |
US6850498B2 (en) | 2000-12-22 | 2005-02-01 | Intel Corporation | Method and system for evaluating a wireless link |
US20020085641A1 (en) | 2000-12-29 | 2002-07-04 | Motorola, Inc | Method and system for interference averaging in a wireless communication system |
US7050510B2 (en) | 2000-12-29 | 2006-05-23 | Lucent Technologies Inc. | Open-loop diversity technique for systems employing four transmitter antennas |
GB0031841D0 (en) | 2000-12-29 | 2001-02-14 | Nokia Networks Oy | Interference power estimation for adaptive antenna system |
US6987819B2 (en) | 2000-12-29 | 2006-01-17 | Motorola, Inc. | Method and device for multiple input/multiple output transmit and receive weights for equal-rate data streams |
US6731668B2 (en) | 2001-01-05 | 2004-05-04 | Qualcomm Incorporated | Method and system for increased bandwidth efficiency in multiple input—multiple output channels |
EP1223776A1 (en) | 2001-01-12 | 2002-07-17 | Siemens Information and Communication Networks S.p.A. | A collision free access scheduling in cellular TDMA-CDMA networks |
US6693992B2 (en) | 2001-01-16 | 2004-02-17 | Mindspeed Technologies | Line probe signal and method of use |
US6801790B2 (en) | 2001-01-17 | 2004-10-05 | Lucent Technologies Inc. | Structure for multiple antenna configurations |
US7164669B2 (en) | 2001-01-19 | 2007-01-16 | Adaptix, Inc. | Multi-carrier communication with time division multiplexing and carrier-selective loading |
US7054662B2 (en) | 2001-01-24 | 2006-05-30 | Qualcomm, Inc. | Method and system for forward link beam forming in wireless communications |
JP2002232943A (ja) | 2001-01-29 | 2002-08-16 | Sony Corp | データ送信処理方法、データ受信処理方法、送信機、受信機、およびセルラー無線通信システム |
GB0102316D0 (en) | 2001-01-30 | 2001-03-14 | Koninkl Philips Electronics Nv | Radio communication system |
US6961388B2 (en) | 2001-02-01 | 2005-11-01 | Qualcomm, Incorporated | Coding scheme for a wireless communication system |
US6885654B2 (en) | 2001-02-06 | 2005-04-26 | Interdigital Technology Corporation | Low complexity data detection using fast fourier transform of channel correlation matrix |
US7120134B2 (en) | 2001-02-15 | 2006-10-10 | Qualcomm, Incorporated | Reverse link channel architecture for a wireless communication system |
US6975868B2 (en) | 2001-02-21 | 2005-12-13 | Qualcomm Incorporated | Method and apparatus for IS-95B reverse link supplemental code channel frame validation and fundamental code channel rate decision improvement |
JP3736429B2 (ja) | 2001-02-21 | 2006-01-18 | 日本電気株式会社 | セルラシステム、基地局、移動局並びに通信制御方法 |
US7006483B2 (en) | 2001-02-23 | 2006-02-28 | Ipr Licensing, Inc. | Qualifying available reverse link coding rates from access channel power setting |
WO2002069523A1 (en) | 2001-02-26 | 2002-09-06 | Magnolia Broadband, Inc | Smart antenna based spectrum multiplexing using a pilot signal |
GB0105019D0 (en) | 2001-03-01 | 2001-04-18 | Koninkl Philips Electronics Nv | Antenna diversity in a wireless local area network |
US7039125B2 (en) | 2001-03-12 | 2006-05-02 | Analog Devices, Inc. | Equalized SNR power back-off |
EP1241824A1 (en) | 2001-03-14 | 2002-09-18 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Multiplexing method in a multicarrier transmit diversity system |
US6763244B2 (en) | 2001-03-15 | 2004-07-13 | Qualcomm Incorporated | Method and apparatus for adjusting power control setpoint in a wireless communication system |
US6478422B1 (en) | 2001-03-19 | 2002-11-12 | Richard A. Hansen | Single bifocal custom shooters glasses |
US7046746B1 (en) | 2001-03-19 | 2006-05-16 | Cisco Systems Wireless Networking (Australia) Pty Limited | Adaptive Viterbi decoder for a wireless data network receiver |
US6771706B2 (en) | 2001-03-23 | 2004-08-03 | Qualcomm Incorporated | Method and apparatus for utilizing channel state information in a wireless communication system |
US7248638B1 (en) | 2001-03-23 | 2007-07-24 | Lsi Logic | Transmit antenna multi-mode tracking |
US7386076B2 (en) | 2001-03-29 | 2008-06-10 | Texas Instruments Incorporated | Space time encoded wireless communication system with multipath resolution receivers |
US8290098B2 (en) | 2001-03-30 | 2012-10-16 | Texas Instruments Incorporated | Closed loop multiple transmit, multiple receive antenna wireless communication system |
US20020176485A1 (en) | 2001-04-03 | 2002-11-28 | Hudson John E. | Multi-cast communication system and method of estimating channel impulse responses therein |
US6785513B1 (en) | 2001-04-05 | 2004-08-31 | Cowave Networks, Inc. | Method and system for clustered wireless networks |
US6859503B2 (en) * | 2001-04-07 | 2005-02-22 | Motorola, Inc. | Method and system in a transceiver for controlling a multiple-input, multiple-output communications channel |
KR100510434B1 (ko) | 2001-04-09 | 2005-08-26 | 니폰덴신뎅와 가부시키가이샤 | Ofdm신호전달 시스템, ofdm신호 송신장치 및ofdm신호 수신장치 |
FR2823620B1 (fr) | 2001-04-12 | 2003-08-15 | France Telecom | Procede de codage/decodage d'un flux de donnees numeriques codees avec entrelacement sur bits en emission et en reception multiple en presence d'interference intersymboles et systeme correspondant |
US7310304B2 (en) * | 2001-04-24 | 2007-12-18 | Bae Systems Information And Electronic Systems Integration Inc. | Estimating channel parameters in multi-input, multi-output (MIMO) systems |
FI20010874A (fi) | 2001-04-26 | 2002-10-27 | Nokia Corp | Tiedonsiirtomenetelmä ja -laitteisto |
GB0110223D0 (en) | 2001-04-26 | 2001-06-20 | Sensor Highway Ltd | Method and apparatus for leak detection and location |
US6611231B2 (en) | 2001-04-27 | 2003-08-26 | Vivato, Inc. | Wireless packet switched communication systems and networks using adaptively steered antenna arrays |
US7133459B2 (en) | 2001-05-01 | 2006-11-07 | Texas Instruments Incorporated | Space-time transmit diversity |
EP1255369A1 (en) | 2001-05-04 | 2002-11-06 | TELEFONAKTIEBOLAGET LM ERICSSON (publ) | Link adaptation for wireless MIMO transmission schemes |
WO2002091779A1 (en) | 2001-05-04 | 2002-11-14 | Nokia Corporation | Admission control with directional antenna |
DE10122788A1 (de) | 2001-05-10 | 2002-06-06 | Basf Ag | Verfahren der kristallisativen Reinigung einer Roh-Schmelze wenigstens eines Monomeren |
US6785341B2 (en) | 2001-05-11 | 2004-08-31 | Qualcomm Incorporated | Method and apparatus for processing data in a multiple-input multiple-output (MIMO) communication system utilizing channel state information |
US7047016B2 (en) | 2001-05-16 | 2006-05-16 | Qualcomm, Incorporated | Method and apparatus for allocating uplink resources in a multiple-input multiple-output (MIMO) communication system |
US6751187B2 (en) | 2001-05-17 | 2004-06-15 | Qualcomm Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel transmission |
US6718493B1 (en) | 2001-05-17 | 2004-04-06 | 3Com Corporation | Method and apparatus for selection of ARQ parameters and estimation of improved communications |
US7688899B2 (en) | 2001-05-17 | 2010-03-30 | Qualcomm Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion |
US7072413B2 (en) | 2001-05-17 | 2006-07-04 | Qualcomm, Incorporated | Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion |
US7492737B1 (en) | 2001-05-23 | 2009-02-17 | Nortel Networks Limited | Service-driven air interface protocol architecture for wireless systems |
ES2188373B1 (es) | 2001-05-25 | 2004-10-16 | Diseño De Sistemas En Silencio, S.A. | Procedimiento de optimizacion de la comunicacion para sistema de transmision digital ofdm multiusuario sobre red electrica. |
US6920194B2 (en) | 2001-05-29 | 2005-07-19 | Tioga Technologies, Ltd. | Method and system for detecting, timing, and correcting impulse noise |
US7158563B2 (en) | 2001-06-01 | 2007-01-02 | The Board Of Trustees Of The Leland Stanford Junior University | Dynamic digital communication system control |
JP3637884B2 (ja) * | 2001-06-01 | 2005-04-13 | ソニー株式会社 | 逆拡散装置、伝播路推定装置、受信装置ならびに干渉抑圧装置、逆拡散、伝播路推定、受信および干渉抑圧方法、該プログラムおよび該プログラムを記録した記録媒体 |
US20020183010A1 (en) | 2001-06-05 | 2002-12-05 | Catreux Severine E. | Wireless communication systems with adaptive channelization and link adaptation |
GB2376315B (en) | 2001-06-05 | 2003-08-06 | 3Com Corp | Data bus system including posted reads and writes |
US20020193146A1 (en) | 2001-06-06 | 2002-12-19 | Mark Wallace | Method and apparatus for antenna diversity in a wireless communication system |
US7190749B2 (en) | 2001-06-06 | 2007-03-13 | Qualcomm Incorporated | Method and apparatus for canceling pilot interference in a wireless communication system |
EP1265411B1 (en) * | 2001-06-08 | 2007-04-18 | Sony Deutschland GmbH | Multicarrier system with adaptive bit-wise interleaving |
US20030012308A1 (en) * | 2001-06-13 | 2003-01-16 | Sampath Hemanth T. | Adaptive channel estimation for wireless systems |
US7027523B2 (en) | 2001-06-22 | 2006-04-11 | Qualcomm Incorporated | Method and apparatus for transmitting data in a time division duplexed (TDD) communication system |
US6842460B1 (en) | 2001-06-27 | 2005-01-11 | Nokia Corporation | Ad hoc network discovery menu |
KR20040008230A (ko) | 2001-06-27 | 2004-01-28 | 노오텔 네트웍스 리미티드 | 무선 통신 시스템에서 제어 정보의 통신 |
US7149190B1 (en) | 2001-06-28 | 2006-12-12 | Nortel Networks Limited | MAC channel operation employable for receiving on more than one forward link channel |
US6751444B1 (en) | 2001-07-02 | 2004-06-15 | Broadstorm Telecommunications, Inc. | Method and apparatus for adaptive carrier allocation and power control in multi-carrier communication systems |
FR2827731B1 (fr) | 2001-07-23 | 2004-01-23 | Nexo | Haut-parleur a radiation directe et rayonnement optimise |
US6996380B2 (en) | 2001-07-26 | 2006-02-07 | Ericsson Inc. | Communication system employing transmit macro-diversity |
US6738020B1 (en) | 2001-07-31 | 2004-05-18 | Arraycomm, Inc. | Estimation of downlink transmission parameters in a radio communications system with an adaptive antenna array |
ATE400097T1 (de) | 2001-08-13 | 2008-07-15 | Motorola Inc | Drahtlose kommunikation mit sendediversität |
KR100703295B1 (ko) | 2001-08-18 | 2007-04-03 | 삼성전자주식회사 | 이동통신시스템에서 안테나 어레이를 이용한 데이터 송/수신 장치 및 방법 |
US20030039317A1 (en) | 2001-08-21 | 2003-02-27 | Taylor Douglas Hamilton | Method and apparatus for constructing a sub-carrier map |
US6807429B2 (en) | 2001-08-22 | 2004-10-19 | Qualcomm Incorporated | Method and apparatus for combining power control commands received in a wireless communication system |
FR2828981B1 (fr) | 2001-08-23 | 2004-05-21 | Commissariat Energie Atomique | Creuset a chauffage par induction et refroidissement par caloducs |
KR100459573B1 (ko) | 2001-08-25 | 2004-12-03 | 삼성전자주식회사 | 고속 순방향 패킷 접속 방식을 사용하는 통신 시스템에서역방향 전송 전력 오프셋과 고속 순방향 공통 채널 전력레벨을 송수신하는 장치 및 방법 |
EP1289328A1 (en) | 2001-08-28 | 2003-03-05 | Lucent Technologies Inc. | A method of sending control information in a wireless telecommunications network, and corresponding apparatus |
US6990059B1 (en) * | 2001-09-05 | 2006-01-24 | Cisco Technology, Inc. | Interference mitigation in a wireless communication system |
US7149254B2 (en) | 2001-09-06 | 2006-12-12 | Intel Corporation | Transmit signal preprocessing based on transmit antennae correlations for multiple antennae systems |
FR2829326A1 (fr) | 2001-09-06 | 2003-03-07 | France Telecom | Procede et systeme de reception iterative sous optimale pour systeme de transmission haut debit cdma |
US7133070B2 (en) | 2001-09-20 | 2006-11-07 | Eastman Kodak Company | System and method for deciding when to correct image-specific defects based on camera, scene, display and demographic data |
US6788948B2 (en) | 2001-09-28 | 2004-09-07 | Arraycomm, Inc. | Frequency dependent calibration of a wideband radio system using narrowband channels |
US7024163B1 (en) | 2001-09-28 | 2006-04-04 | Arraycomm Llc | Method and apparatus for adjusting feedback of a remote unit |
US7277679B1 (en) | 2001-09-28 | 2007-10-02 | Arraycomm, Llc | Method and apparatus to provide multiple-mode spatial processing to a terminal unit |
US7039363B1 (en) | 2001-09-28 | 2006-05-02 | Arraycomm Llc | Adaptive antenna array with programmable sensitivity |
US7269127B2 (en) * | 2001-10-04 | 2007-09-11 | Bae Systems Information And Electronic Systems Integration Inc. | Preamble structures for single-input, single-output (SISO) and multi-input, multi-output (MIMO) communication systems |
US7035359B2 (en) | 2001-10-11 | 2006-04-25 | Telefonaktiebolaget L.M. Ericsson | Methods and apparatus for demodulation of a signal in a signal slot subject to a discontinuous interference signal |
US7548506B2 (en) * | 2001-10-17 | 2009-06-16 | Nortel Networks Limited | System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design |
US7248559B2 (en) | 2001-10-17 | 2007-07-24 | Nortel Networks Limited | Scattered pilot pattern and channel estimation method for MIMO-OFDM systems |
KR100533205B1 (ko) | 2001-10-17 | 2005-12-05 | 닛본 덴끼 가부시끼가이샤 | 이동 통신 시스템, 통신 제어 방법, 이것에 사용되는기지국 및 이동국 |
US7773699B2 (en) | 2001-10-17 | 2010-08-10 | Nortel Networks Limited | Method and apparatus for channel quality measurements |
US7116652B2 (en) | 2001-10-18 | 2006-10-03 | Lucent Technologies Inc. | Rate control technique for layered architectures with multiple transmit and receive antennas |
US20030119452A1 (en) | 2001-10-19 | 2003-06-26 | Samsung Electronics Co., Ltd. | Apparatus and method for controlling transmission power of downlink data channel in a mobile communication system supporting MBMS |
US7349667B2 (en) | 2001-10-19 | 2008-03-25 | Texas Instruments Incorporated | Simplified noise estimation and/or beamforming for wireless communications |
JP3607238B2 (ja) | 2001-10-22 | 2005-01-05 | 株式会社東芝 | Ofdm信号受信システム |
EP1363410A4 (en) | 2001-10-31 | 2010-10-20 | Panasonic Corp | RADIO TRANSMISSION DEVICE AND RADIO COMMUNICATION METHOD |
US7164649B2 (en) | 2001-11-02 | 2007-01-16 | Qualcomm, Incorporated | Adaptive rate control for OFDM communication system |
US7218684B2 (en) | 2001-11-02 | 2007-05-15 | Interdigital Technology Corporation | Method and system for code reuse and capacity enhancement using null steering |
US20030125040A1 (en) | 2001-11-06 | 2003-07-03 | Walton Jay R. | Multiple-access multiple-input multiple-output (MIMO) communication system |
US8018903B2 (en) | 2001-11-21 | 2011-09-13 | Texas Instruments Incorporated | Closed-loop transmit diversity scheme in frequency selective multipath channels |
JP3989439B2 (ja) * | 2001-11-28 | 2007-10-10 | 富士通株式会社 | 直交周波数分割多重伝送方法 |
US7346126B2 (en) | 2001-11-28 | 2008-03-18 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for channel estimation using plural channels |
US7263119B1 (en) | 2001-11-29 | 2007-08-28 | Marvell International Ltd. | Decoding method and apparatus |
US7154936B2 (en) | 2001-12-03 | 2006-12-26 | Qualcomm, Incorporated | Iterative detection and decoding for a MIMO-OFDM system |
US6760388B2 (en) | 2001-12-07 | 2004-07-06 | Qualcomm Incorporated | Time-domain transmit and receive processing with channel eigen-mode decomposition for MIMO systems |
US7155171B2 (en) | 2001-12-12 | 2006-12-26 | Saraband Wireless | Vector network analyzer applique for adaptive communications in wireless networks |
US20030112745A1 (en) | 2001-12-17 | 2003-06-19 | Xiangyang Zhuang | Method and system of operating a coded OFDM communication system |
US7076514B2 (en) | 2001-12-18 | 2006-07-11 | Conexant, Inc. | Method and system for computing pre-equalizer coefficients |
US7099398B1 (en) | 2001-12-18 | 2006-08-29 | Vixs, Inc. | Method and apparatus for establishing non-standard data rates in a wireless communication system |
KR100444730B1 (ko) | 2001-12-24 | 2004-08-16 | 한국전자통신연구원 | 광대역 부호 분할 다중 접속 시스템용 기지국의 복조 장치및 방법 |
US7573805B2 (en) | 2001-12-28 | 2009-08-11 | Motorola, Inc. | Data transmission and reception method and apparatus |
JP4052835B2 (ja) | 2001-12-28 | 2008-02-27 | 株式会社日立製作所 | 多地点中継を行う無線伝送システム及びそれに使用する無線装置 |
CA2366397A1 (en) | 2001-12-31 | 2003-06-30 | Tropic Networks Inc. | An interface for data transfer between integrated circuits |
US7209433B2 (en) * | 2002-01-07 | 2007-04-24 | Hitachi, Ltd. | Channel estimation and compensation techniques for use in frequency division multiplexed systems |
US7020110B2 (en) | 2002-01-08 | 2006-03-28 | Qualcomm Incorporated | Resource allocation for MIMO-OFDM communication systems |
US7020482B2 (en) | 2002-01-23 | 2006-03-28 | Qualcomm Incorporated | Reallocation of excess power for full channel-state information (CSI) multiple-input, multiple-output (MIMO) systems |
US7058116B2 (en) | 2002-01-25 | 2006-06-06 | Intel Corporation | Receiver architecture for CDMA receiver downlink |
US7283508B2 (en) | 2002-02-07 | 2007-10-16 | Samsung Electronics Co., Ltd. | Apparatus and method for transmitting/receiving serving HS-SCCH set information in an HSDPA communication system |
US7046978B2 (en) | 2002-02-08 | 2006-05-16 | Qualcomm, Inc. | Method and apparatus for transmit pre-correction in wireless communications |
US6650691B2 (en) | 2002-02-12 | 2003-11-18 | Motorola, Inc. | Power control in spread spectrum communications systems |
US6980800B2 (en) | 2002-02-12 | 2005-12-27 | Hughes Network Systems | System and method for providing contention channel organization for broadband satellite access in a communications network |
US7292854B2 (en) | 2002-02-15 | 2007-11-06 | Lucent Technologies Inc. | Express signaling in a wireless communication system |
US7076263B2 (en) | 2002-02-19 | 2006-07-11 | Qualcomm, Incorporated | Power control for partial channel-state information (CSI) multiple-input, multiple-output (MIMO) systems |
US6862271B2 (en) | 2002-02-26 | 2005-03-01 | Qualcomm Incorporated | Multiple-input, multiple-output (MIMO) systems with multiple transmission modes |
US20030162519A1 (en) | 2002-02-26 | 2003-08-28 | Martin Smith | Radio communications device |
US6959171B2 (en) | 2002-02-28 | 2005-10-25 | Intel Corporation | Data transmission rate control |
US6687492B1 (en) | 2002-03-01 | 2004-02-03 | Cognio, Inc. | System and method for antenna diversity using joint maximal ratio combining |
US6636568B2 (en) | 2002-03-01 | 2003-10-21 | Qualcomm | Data transmission with non-uniform distribution of data rates for a multiple-input multiple-output (MIMO) system |
US6873651B2 (en) | 2002-03-01 | 2005-03-29 | Cognio, Inc. | System and method for joint maximal ratio combining using time-domain signal processing |
US20040047284A1 (en) * | 2002-03-13 | 2004-03-11 | Eidson Donald Brian | Transmit diversity framing structure for multipath channels |
US7406065B2 (en) | 2002-03-14 | 2008-07-29 | Qualcomm, Incorporated | Method and apparatus for reducing inter-channel interference in a wireless communication system |
US7035284B2 (en) | 2002-03-14 | 2006-04-25 | Qualcomm Incorporated | Method and apparatus for reducing inter-channel interference in a wireless communication system employing a non-periodic interleaver |
JP3561510B2 (ja) | 2002-03-22 | 2004-09-02 | 松下電器産業株式会社 | 基地局装置及びパケット伝送方法 |
US7042858B1 (en) | 2002-03-22 | 2006-05-09 | Jianglei Ma | Soft handoff for OFDM |
US20040198276A1 (en) | 2002-03-26 | 2004-10-07 | Jose Tellado | Multiple channel wireless receiver |
US7012978B2 (en) | 2002-03-26 | 2006-03-14 | Intel Corporation | Robust multiple chain receiver |
US7197084B2 (en) | 2002-03-27 | 2007-03-27 | Qualcomm Incorporated | Precoding for a multipath channel in a MIMO system |
KR100456693B1 (ko) | 2002-03-28 | 2004-11-10 | 삼성전자주식회사 | 다중채널 통신 시스템의 비트 할당을 최적화하여 셋업시간을 최소화하는 방법 |
US20030186650A1 (en) | 2002-03-29 | 2003-10-02 | Jung-Tao Liu | Closed loop multiple antenna system |
US7224704B2 (en) | 2002-04-01 | 2007-05-29 | Texas Instruments Incorporated | Wireless network scheduling data frames including physical layer configuration |
US7099377B2 (en) | 2002-04-03 | 2006-08-29 | Stmicroelectronics N.V. | Method and device for interference cancellation in a CDMA wireless communication system |
US6850741B2 (en) | 2002-04-04 | 2005-02-01 | Agency For Science, Technology And Research | Method for selecting switched orthogonal beams for downlink diversity transmission |
US7020226B1 (en) | 2002-04-04 | 2006-03-28 | Nortel Networks Limited | I/Q distortion compensation for the reception of OFDM signals |
US7103325B1 (en) | 2002-04-05 | 2006-09-05 | Nortel Networks Limited | Adaptive modulation and coding |
US6804191B2 (en) | 2002-04-05 | 2004-10-12 | Flarion Technologies, Inc. | Phase sequences for timing and access signals |
US7623871B2 (en) | 2002-04-24 | 2009-11-24 | Qualcomm Incorporated | Position determination for a wireless terminal in a hybrid position determination system |
US7876726B2 (en) | 2002-04-29 | 2011-01-25 | Texas Instruments Incorporated | Adaptive allocation of communications link channels to I- or Q-subchannel |
US7352722B2 (en) | 2002-05-13 | 2008-04-01 | Qualcomm Incorporated | Mitigation of link imbalance in a wireless communication system |
US6690660B2 (en) | 2002-05-22 | 2004-02-10 | Interdigital Technology Corporation | Adaptive algorithm for a Cholesky approximation |
US7327800B2 (en) | 2002-05-24 | 2008-02-05 | Vecima Networks Inc. | System and method for data detection in wireless communication systems |
US6862440B2 (en) | 2002-05-29 | 2005-03-01 | Intel Corporation | Method and system for multiple channel wireless transmitter and receiver phase and amplitude calibration |
US7421039B2 (en) | 2002-06-04 | 2008-09-02 | Lucent Technologies Inc. | Method and system employing antenna arrays |
KR100498326B1 (ko) | 2002-06-18 | 2005-07-01 | 엘지전자 주식회사 | 이동통신 단말기의 적응 변조 코딩 장치 및 방법 |
US7184713B2 (en) | 2002-06-20 | 2007-02-27 | Qualcomm, Incorporated | Rate control for multi-channel communication systems |
US7095709B2 (en) | 2002-06-24 | 2006-08-22 | Qualcomm, Incorporated | Diversity transmission modes for MIMO OFDM communication systems |
US7359313B2 (en) | 2002-06-24 | 2008-04-15 | Agere Systems Inc. | Space-time bit-interleaved coded modulation for wideband transmission |
US7613248B2 (en) | 2002-06-24 | 2009-11-03 | Qualcomm Incorporated | Signal processing with channel eigenmode decomposition and channel inversion for MIMO systems |
US7551546B2 (en) | 2002-06-27 | 2009-06-23 | Nortel Networks Limited | Dual-mode shared OFDM methods/transmitters, receivers and systems |
ES2279118T3 (es) | 2002-06-27 | 2007-08-16 | Koninklijke Philips Electronics N.V. | Medicion de caracteristicas de canal en un sistema de comunicacion. |
US7342912B1 (en) | 2002-06-28 | 2008-03-11 | Arraycomm, Llc. | Selection of user-specific transmission parameters for optimization of transmit performance in wireless communications using a common pilot channel |
EP1379020A1 (en) | 2002-07-03 | 2004-01-07 | National University Of Singapore | A wireless communication apparatus and method |
US7912999B2 (en) * | 2002-07-03 | 2011-03-22 | Freescale Semiconductor, Inc. | Buffering method and apparatus for processing digital communication signals |
US20040017785A1 (en) | 2002-07-16 | 2004-01-29 | Zelst Allert Van | System for transporting multiple radio frequency signals of a multiple input, multiple output wireless communication system to/from a central processing base station |
US6683916B1 (en) | 2002-07-17 | 2004-01-27 | Philippe Jean-Marc Sartori | Adaptive modulation/coding and power allocation system |
US6885708B2 (en) * | 2002-07-18 | 2005-04-26 | Motorola, Inc. | Training prefix modulation method and receiver |
KR20040011653A (ko) * | 2002-07-29 | 2004-02-11 | 삼성전자주식회사 | 채널 특성에 적응적인 직교 주파수 분할 다중 통신 방법및 장치 |
AU2003263818B2 (en) | 2002-07-30 | 2007-05-24 | Ipr Licensing Inc. | System and method for multiple-input multiple-output (MIMO) radio communication |
US6961595B2 (en) | 2002-08-08 | 2005-11-01 | Flarion Technologies, Inc. | Methods and apparatus for operating mobile nodes in multiple states |
US7653415B2 (en) | 2002-08-21 | 2010-01-26 | Broadcom Corporation | Method and system for increasing data rate in a mobile terminal using spatial multiplexing for DVB-H communication |
EP1392004B1 (en) | 2002-08-22 | 2009-01-21 | Interuniversitair Microelektronica Centrum Vzw | Method for multi-user MIMO transmission and apparatuses suited therefore |
US6970722B1 (en) | 2002-08-22 | 2005-11-29 | Cisco Technology, Inc. | Array beamforming with wide nulls |
US20040037257A1 (en) | 2002-08-23 | 2004-02-26 | Koninklijke Philips Electronics N.V. | Method and apparatus for assuring quality of service in wireless local area networks |
US8194770B2 (en) | 2002-08-27 | 2012-06-05 | Qualcomm Incorporated | Coded MIMO systems with selective channel inversion applied per eigenmode |
US6940917B2 (en) | 2002-08-27 | 2005-09-06 | Qualcomm, Incorporated | Beam-steering and beam-forming for wideband MIMO/MISO systems |
US8018904B2 (en) | 2002-09-06 | 2011-09-13 | Nokia Corporation | Antenna selection method |
US7260153B2 (en) | 2002-09-09 | 2007-08-21 | Mimopro Ltd. | Multi input multi output wireless communication method and apparatus providing extended range and extended rate across imperfectly estimated channels |
US20040052228A1 (en) | 2002-09-16 | 2004-03-18 | Jose Tellado | Method and system of frequency and time synchronization of a transceiver to signals received by the transceiver |
US7426176B2 (en) | 2002-09-30 | 2008-09-16 | Lucent Technologies Inc. | Method of power allocation and rate control in OFDMA systems |
FR2845626B1 (fr) | 2002-10-14 | 2005-12-16 | Rotelec Sa | Procede pour la maitrise des mouvements du metal, dans une lingotiere de coulee continue de brames |
US6850511B2 (en) | 2002-10-15 | 2005-02-01 | Intech 21, Inc. | Timely organized ad hoc network and protocol for timely organized ad hoc network |
US7961774B2 (en) | 2002-10-15 | 2011-06-14 | Texas Instruments Incorporated | Multipath interference-resistant receivers for closed-loop transmit diversity (CLTD) in code-division multiple access (CDMA) systems |
US20040121730A1 (en) | 2002-10-16 | 2004-06-24 | Tamer Kadous | Transmission scheme for multi-carrier MIMO systems |
US7453844B1 (en) | 2002-10-22 | 2008-11-18 | Hong Kong Applied Science and Technology Research Institute, Co., Ltd. | Dynamic allocation of channels in a wireless network |
US7200404B2 (en) | 2002-10-22 | 2007-04-03 | Texas Instruments Incorporated | Information storage to support wireless communication in non-exclusive spectrum |
US7151809B2 (en) | 2002-10-25 | 2006-12-19 | Qualcomm, Incorporated | Channel estimation and spatial processing for TDD MIMO systems |
US8170513B2 (en) | 2002-10-25 | 2012-05-01 | Qualcomm Incorporated | Data detection and demodulation for wireless communication systems |
US20040081131A1 (en) | 2002-10-25 | 2004-04-29 | Walton Jay Rod | OFDM communication system with multiple OFDM symbol sizes |
US7002900B2 (en) | 2002-10-25 | 2006-02-21 | Qualcomm Incorporated | Transmit diversity processing for a multi-antenna communication system |
US8169944B2 (en) | 2002-10-25 | 2012-05-01 | Qualcomm Incorporated | Random access for wireless multiple-access communication systems |
MXPA05004311A (es) | 2002-10-25 | 2005-08-03 | Qualcomm Inc | Deteccion y demodulacion de datos para sistemas de comunicaciones inalambricas. |
US7324429B2 (en) | 2002-10-25 | 2008-01-29 | Qualcomm, Incorporated | Multi-mode terminal in a wireless MIMO system |
US8218609B2 (en) | 2002-10-25 | 2012-07-10 | Qualcomm Incorporated | Closed-loop rate control for a multi-channel communication system |
US7986742B2 (en) | 2002-10-25 | 2011-07-26 | Qualcomm Incorporated | Pilots for MIMO communication system |
US8320301B2 (en) | 2002-10-25 | 2012-11-27 | Qualcomm Incorporated | MIMO WLAN system |
US8570988B2 (en) | 2002-10-25 | 2013-10-29 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
US8208364B2 (en) | 2002-10-25 | 2012-06-26 | Qualcomm Incorporated | MIMO system with multiple spatial multiplexing modes |
US8134976B2 (en) | 2002-10-25 | 2012-03-13 | Qualcomm Incorporated | Channel calibration for a time division duplexed communication system |
AU2002353638A1 (en) | 2002-10-26 | 2004-05-13 | Electronics And Telecommunications Research Institute | Frequency hopping ofdma method using symbols of comb pattern |
US7317750B2 (en) | 2002-10-31 | 2008-01-08 | Lot 41 Acquisition Foundation, Llc | Orthogonal superposition coding for direct-sequence communications |
EP1416688A1 (en) | 2002-10-31 | 2004-05-06 | Motorola Inc. | Iterative channel estimation in multicarrier receivers |
US7280625B2 (en) | 2002-12-11 | 2007-10-09 | Qualcomm Incorporated | Derivation of eigenvectors for spatial processing in MIMO communication systems |
US7280467B2 (en) | 2003-01-07 | 2007-10-09 | Qualcomm Incorporated | Pilot transmission schemes for wireless multi-carrier communication systems |
US7583637B2 (en) | 2003-01-31 | 2009-09-01 | Alcatel-Lucent Usa Inc. | Methods of controlling data rate in wireless communications systems |
US7058367B1 (en) | 2003-01-31 | 2006-06-06 | At&T Corp. | Rate-adaptive methods for communicating over multiple input/multiple output wireless systems |
US20040176097A1 (en) | 2003-02-06 | 2004-09-09 | Fiona Wilson | Allocation of sub channels of MIMO channels of a wireless network |
EP1447934A1 (en) | 2003-02-12 | 2004-08-18 | Institut Eurecom G.I.E. | Transmission and reception diversity process for wireless communications |
JP2004266586A (ja) | 2003-03-03 | 2004-09-24 | Hitachi Ltd | 移動通信システムのデータ送受信方法 |
JP4250002B2 (ja) | 2003-03-05 | 2009-04-08 | 富士通株式会社 | 適応型変調伝送システム及び適応型変調制御方法 |
US6927728B2 (en) | 2003-03-13 | 2005-08-09 | Motorola, Inc. | Method and apparatus for multi-antenna transmission |
US7822140B2 (en) | 2003-03-17 | 2010-10-26 | Broadcom Corporation | Multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining |
US7885228B2 (en) | 2003-03-20 | 2011-02-08 | Qualcomm Incorporated | Transmission mode selection for data transmission in a multi-channel communication system |
JP4259897B2 (ja) | 2003-03-25 | 2009-04-30 | シャープ株式会社 | 無線データ伝送システム及び無線データ送受信装置 |
US7242727B2 (en) | 2003-03-31 | 2007-07-10 | Lucent Technologies Inc. | Method of determining transmit power for transmit eigenbeams in a multiple-input multiple-output communications system |
US7403503B2 (en) | 2003-07-09 | 2008-07-22 | Interdigital Technology Corporation | Resource allocation in wireless communication systems |
EP1645159B1 (en) | 2003-07-11 | 2008-05-07 | Qualcomm, Incorporated | Dynamic shared forward link channel for a wireless communication system |
CN100429311C (zh) | 2003-08-08 | 2008-10-29 | 四川禾本生物工程有限公司 | 高抗草苷膦的epsp合成酶及其编码序列 |
US7065144B2 (en) | 2003-08-27 | 2006-06-20 | Qualcomm Incorporated | Frequency-independent spatial processing for wideband MISO and MIMO systems |
EP1665642B1 (en) | 2003-08-27 | 2010-11-03 | Wavion Ltd. | Wlan capacity enhancement using sdm |
US7356089B2 (en) | 2003-09-05 | 2008-04-08 | Nortel Networks Limited | Phase offset spatial multiplexing |
KR100995031B1 (ko) | 2003-10-01 | 2010-11-19 | 엘지전자 주식회사 | 다중입력 다중출력 시스템에 적용되는 신호 전송 제어 방법 |
US8483105B2 (en) | 2003-10-15 | 2013-07-09 | Qualcomm Incorporated | High speed media access control |
US8842657B2 (en) | 2003-10-15 | 2014-09-23 | Qualcomm Incorporated | High speed media access control with legacy system interoperability |
US8233462B2 (en) | 2003-10-15 | 2012-07-31 | Qualcomm Incorporated | High speed media access control and direct link protocol |
AU2004307449C1 (en) | 2003-10-24 | 2009-04-30 | Qualcomm Incorporated | Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system |
US8526412B2 (en) | 2003-10-24 | 2013-09-03 | Qualcomm Incorporated | Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system |
US7508748B2 (en) | 2003-10-24 | 2009-03-24 | Qualcomm Incorporated | Rate selection for a multi-carrier MIMO system |
US7616698B2 (en) | 2003-11-04 | 2009-11-10 | Atheros Communications, Inc. | Multiple-input multiple output system and method |
US7298805B2 (en) | 2003-11-21 | 2007-11-20 | Qualcomm Incorporated | Multi-antenna transmission for spatial division multiple access |
US9473269B2 (en) | 2003-12-01 | 2016-10-18 | Qualcomm Incorporated | Method and apparatus for providing an efficient control channel structure in a wireless communication system |
US7231184B2 (en) | 2003-12-05 | 2007-06-12 | Texas Instruments Incorporated | Low overhead transmit channel estimation |
US7872963B2 (en) | 2003-12-27 | 2011-01-18 | Electronics And Telecommunications Research Institute | MIMO-OFDM system using eigenbeamforming method |
US7333556B2 (en) | 2004-01-12 | 2008-02-19 | Intel Corporation | System and method for selecting data rates to provide uniform bit loading of subcarriers of a multicarrier communication channel |
JP2005223829A (ja) | 2004-02-09 | 2005-08-18 | Nec Electronics Corp | 分数分周回路及びこれを用いたデータ伝送装置 |
US7746886B2 (en) | 2004-02-19 | 2010-06-29 | Broadcom Corporation | Asymmetrical MIMO wireless communications |
US7206354B2 (en) | 2004-02-19 | 2007-04-17 | Qualcomm Incorporated | Calibration of downlink and uplink channel responses in a wireless MIMO communication system |
US7274734B2 (en) | 2004-02-20 | 2007-09-25 | Aktino, Inc. | Iterative waterfiling with explicit bandwidth constraints |
US7848442B2 (en) | 2004-04-02 | 2010-12-07 | Lg Electronics Inc. | Signal processing apparatus and method in multi-input/multi-output communications systems |
US7486740B2 (en) | 2004-04-02 | 2009-02-03 | Qualcomm Incorporated | Calibration of transmit and receive chains in a MIMO communication system |
US7110463B2 (en) | 2004-06-30 | 2006-09-19 | Qualcomm, Incorporated | Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system |
US7606319B2 (en) | 2004-07-15 | 2009-10-20 | Nokia Corporation | Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels |
US20060018247A1 (en) | 2004-07-22 | 2006-01-26 | Bas Driesen | Method and apparatus for space interleaved communication in a multiple antenna communication system |
US7599443B2 (en) | 2004-09-13 | 2009-10-06 | Nokia Corporation | Method and apparatus to balance maximum information rate with quality of service in a MIMO system |
KR100905605B1 (ko) | 2004-09-24 | 2009-07-02 | 삼성전자주식회사 | 직교주파수분할다중화 다중입출력 통신 시스템의 전송 방법 |
EP1829262B1 (en) | 2004-11-16 | 2018-03-14 | QUALCOMM Incorporated | Closed-loop rate control for a mimo communication system |
US8498215B2 (en) | 2004-11-16 | 2013-07-30 | Qualcomm Incorporated | Open-loop rate control for a TDD communication system |
US7525988B2 (en) | 2005-01-17 | 2009-04-28 | Broadcom Corporation | Method and system for rate selection algorithm to maximize throughput in closed loop multiple input multiple output (MIMO) wireless local area network (WLAN) system |
US7466749B2 (en) | 2005-05-12 | 2008-12-16 | Qualcomm Incorporated | Rate selection with margin sharing |
US7603141B2 (en) | 2005-06-02 | 2009-10-13 | Qualcomm, Inc. | Multi-antenna station with distributed antennas |
US8358714B2 (en) | 2005-06-16 | 2013-01-22 | Qualcomm Incorporated | Coding and modulation for multiple data streams in a communication system |
US20090161613A1 (en) | 2007-11-30 | 2009-06-25 | Mark Kent | Method and system for constructing channel quality indicator tables for feedback in a communication system |
US20090291642A1 (en) | 2008-05-23 | 2009-11-26 | Telefonaktiebolaget Lm Ericsson (Publ) | Systems and Methods for SIR Estimation for Power Control |
US8619620B2 (en) | 2008-09-16 | 2013-12-31 | Qualcomm Incorporated | Methods and systems for transmission mode selection in a multi channel communication system |
ES2355347B1 (es) | 2009-01-30 | 2012-02-10 | Vodafone España, S.A.U. | Método para detectar interferencias en un sistema de comunicación inal�?mbrico. |
US20100260060A1 (en) | 2009-04-08 | 2010-10-14 | Qualcomm Incorporated | Integrated calibration protocol for wireless lans |
KR20130018079A (ko) | 2011-08-10 | 2013-02-20 | 삼성전자주식회사 | 무선 통신 시스템에서 빔 고정 장치 및 방법 |
-
2003
- 2003-02-25 US US10/375,162 patent/US20040081131A1/en not_active Abandoned
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- 2003-10-27 CA CA2756728A patent/CA2756728C/en not_active Expired - Lifetime
- 2003-10-27 EP EP11173875A patent/EP2378726A3/en not_active Withdrawn
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- 2009-05-26 AU AU2009202082A patent/AU2009202082B2/en not_active Expired
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-
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-
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- 2013-06-18 US US13/920,971 patent/US9154274B2/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1248370A (zh) * | 1997-02-25 | 2000-03-22 | 诺基亚电信公司 | 利用奇异值分解进行信道脉冲响应估算 |
GB2373973A (en) * | 2001-03-30 | 2002-10-02 | Toshiba Res Europ Ltd | Adaptive OFDM receiver where sets of sub-carriers which are coherent are grouped into sub-bands and a single weight is calculated for each sub-band |
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