-
公开(公告)号：US08774103B2
公开(公告)日：2014-07-08
申请号：US12079302
申请日：2008-03-26
CPC分类号： H04W72/0413 , H04W8/30
摘要： A method and apparatus of selecting a number of uplink sounding sub-carriers are disclosed. One method includes estimating an uplink channel of between a base station and a subscriber. A time domain channel response is determined from the estimated uplink channel. A sub-carrier distribution of uplink sounding sub-carriers is selected based on characteristics of the time domain channel response, wherein the distribution defines a spacing of pilot sub-carriers within the uplink sounding symbol. The subscriber transmits uplink sounding symbols having the selected sub-carrier distribution.
摘要翻译： 公开了一种选择多个上行探测子载波的方法和装置。 一种方法包括估计基站和用户之间的上行链路信道。 从估计的上行链路信道确定时域信道响应。 基于时域信道响应的特性来选择上行链路探测子载波的子载波分布，其中分布定义了上行探测符号内的导频子载波的间隔。 用户发送具有所选择的子载波分布的上行探测符号。
-
公开(公告)号：US20130005358A1
公开(公告)日：2013-01-03
申请号：US13611889
申请日：2012-09-12
IPC分类号： H04W24/00
CPC分类号： G01S5/14 , G01S5/0205 , H04W64/00
摘要： Estimating a location of a subscriber, including receiving a request for the location, identifying a serving base station of the subscriber, receiving a downlink frame from the serving base station, obtaining a time delay of a signal transmitted between the subscriber and the serving base station, the obtaining including estimating a time of arrival by extracting information from the received downlink frame, the extracting including, determining a channel impulse response of the downlink frame, and estimating the time of arrival by comparing a peak time of the determined channel impulse response with a start time of the downlink frame, the start time being estimated based on the channel impulse response exceeding a predetermined threshold value, estimating a distance between the subscriber and the serving base station based on the time delay, and estimating the location based on the estimated distance between the subscriber and the serving base station.
摘要翻译： 估计用户的位置，包括接收对该位置的请求，识别用户的服务基站，从服务基站接收下行链路帧，获得在用户与服务基站之间传输的信号的时间延迟 所述获取包括通过从所接收的下行链路帧中提取信息来估计到达时间，所述提取包括：确定所述下行链路帧的信道脉冲响应，以及通过将所确定的信道脉冲响应的峰值时间与 下行链路帧的开始时间，基于超过预定阈值的信道脉冲响应来估计开始时间，基于时间延迟估计用户和服务基站之间的距离，并且基于估计的 用户和服务基站之间的距离。
-
23.发明授权Downlink coordinated transmission in OFDMA systems, including WiMax systems 失效OFDMA系统中的下行协调传输，包括WiMax系统公开(公告)号：US07764658B2
公开(公告)日：2010-07-27
申请号：US11725920
申请日：2007-03-20
IPC分类号： H04J3/00
CPC分类号： H04L5/0058 , H04L5/0023 , H04L5/0037 , H04L5/023 , H04L27/2608 , H04W16/10 , H04W16/24 , H04W72/082 , H04W72/085
摘要： Embodiments described herein include methods for improving the SINR, and therefore communication quality or rate, in the downlink of a cellular communication system. In an embodiment, the system is an orthogonal-frequency-division multiple-access (OFDMA) system. In an embodiment, a set of terminals is designated a coordinated-transmission group. The set of terminal is chosen such that the slot-allocations of the set are given special treatment to alleviate interference from other sectors or cells. In an embodiment, “zones” defined in the WiMax standard are “repurposed” to handle the coordinated-transmission, although the zone was originally intended for another purpose.
摘要翻译： 本文描述的实施例包括用于在蜂窝通信系统的下行链路中改善SINR以及因此通信质量或速率的方法。 在一个实施例中，该系统是正交频分多址（OFDMA）系统。 在一个实施例中，一组终端被指定为协调传输组。 选择终端的集合，使得该组的时隙分配被给予特殊处理以减轻来自其他扇区或小区的干扰。 在一个实施例中，WiMax标准中定义的“区域”被“重新利用”以处理协调传输，尽管该区域原本是为了另一目的。
-
公开(公告)号：US07706335B2
公开(公告)日：2010-04-27
申请号：US11725919
申请日：2007-03-20
IPC分类号： H04J3/00
CPC分类号： H04L5/0058 , H04L5/0023 , H04L5/0037 , H04L5/023 , H04L27/2608 , H04W16/10 , H04W16/24 , H04W72/082 , H04W72/085
摘要： Embodiments described herein include methods for improving the SINR, and therefore communication quality or rate, in the downlink of a cellular communication system. In an embodiment, the system is an orthogonal-frequency-division multiple-access (OFDMA) system. In an embodiment, a set of terminals is designated a coordinated-transmission group. The set of terminal is chosen such that the slot-allocations of the set are given special treatment to alleviate interference from other sectors or cells. All terminals within a coordination group generally use the same slot, but embodiments are not so limited.
摘要翻译： 本文描述的实施例包括用于在蜂窝通信系统的下行链路中改善SINR以及因此通信质量或速率的方法。 在一个实施例中，该系统是正交频分多址（OFDMA）系统。 在一个实施例中，一组终端被指定为协调传输组。 选择终端的集合，使得该组的时隙分配被给予特殊处理以减轻来自其他扇区或小区的干扰。 协调组中的所有终端通常使用相同的时隙，但实施例不限于此。
-
公开(公告)号：US07684511B2
公开(公告)日：2010-03-23
申请号：US11506734
申请日：2006-08-17
IPC分类号： H04B7/02
CPC分类号： H04B7/0671 , H04B7/0615 , H04B7/0682 , H04B7/10 , H04L27/2626
摘要： Communication systems and methods are described in which multiple transmit signals are generated from an input stream or signal. The communication systems and methods, collectively referred to as antenna virtualization or virtual antenna systems, generate from each input stream multiple transmit signals that when driven into multiple antennas create a radiation pattern that effectively appears to originate from a single antenna. The communications operations include receiving at least one input stream. Multiple transmit signals are generated from the received input stream; the number of transmit signals generated is greater than the number of received input streams. Generation of the transmit signals involves transforming the input stream. The transforming includes applying one or more of a variable delay, a phase shift, and signal shaping to information of the input stream. The transmit signals are transmitted by a separate antenna of an antenna system.
摘要翻译： 描述了从输入流或信号生成多个发送信号的通信系统和方法。 统称为天线虚拟化或虚拟天线系统的通信系统和方法从每个输入流产生多个发射信号，当被驱动到多个天线中时，产生有效地似乎源于单个天线的辐射图。 通信操作包括接收至少一个输入流。 从接收到的输入流生成多个发送信号; 生成的发送信号的数量大于接收的输入流的数量。 发送信号的生成涉及变换输入流。 变换包括将可变延迟，相移和信号整形中的一个或多个应用于输入流的信息。 发射信号由天线系统的单独天线发射。
-
公开(公告)号：US07477698B2
公开(公告)日：2009-01-13
申请号：US11205504
申请日：2005-08-16
申请人： Shashidhar Vummintala , Arogyaswami Paulraj , Erik D. Lindskog , Balaji S. Rajan , Djordje Tujkovic
发明人： Shashidhar Vummintala , Arogyaswami Paulraj , Erik D. Lindskog , Balaji S. Rajan , Djordje Tujkovic
IPC分类号： H04B7/02
CPC分类号： H04L1/0606 , H04L1/0071 , H04L1/0618
摘要： Signal encoding in a multiple input multiple output system in a wireless communication network is provided. The communication system provides a method of encoding and transmitting symbols in a rate-2 complex symbol per second per Hertz transmission system that achieves a maximum diversity of four for a four transmit antenna system and a diversity of three on a three transmit antenna system. The communication system further provides a method of interleaving the complex symbols such that each interleaved symbol comprises information of at least two complex symbols where the complex symbols obtain values from a rotated constellation.
摘要翻译： 提供了在无线通信网络中的多输入多输出系统中的信号编码。 通信系统提供了一种以Hertz传输系统每秒的速率2复数符号进行编码和传输符号的方法，其对于四个发射天线系统实现四个最大分集，在三个发射天线系统上实现三分之一。 通信系统还提供了一种对复数符号进行交织的方法，使得每个交错符号包括复数符号从旋转星座获得值的至少两个复符号的信息。
-
27.发明申请公开(公告)号：US20080239938A1
公开(公告)日：2008-10-02
申请号：US11731714
申请日：2007-03-30
申请人： Louay Jalloul , Djordje Tujkovic , Vummintala Shashidhar , Bertrand Hochwald , Arogyaswami Paulraj
发明人： Louay Jalloul , Djordje Tujkovic , Vummintala Shashidhar , Bertrand Hochwald , Arogyaswami Paulraj
IPC分类号： H04J1/12
CPC分类号： H04W72/082 , H04B7/0491 , H04L5/023 , H04L2025/03414 , H04L2025/03426 , H04W52/24 , H04W52/241 , H04W52/243
摘要： Embodiments disclose a method of coordinating reception of uplink transmissions in order to reduce interference among transceivers in an OFDM wireless transmission system, or similar communication system, including a number of receivers communicating with one or more basestations in cell or sector arrangements. A basestation within each sector includes an uplink coordinated reception process that imposes coordinated reception techniques across sector or cell boundaries in order to improve uplink transmission quality between target terminals and basestations within each sector.
摘要翻译： 实施例公开了一种协调上行链路传输的接收的方法，以便减少OFDM无线传输系统中的收发器之间的干扰，或者类似的通信系统，包括与小区或扇区布置中的一个或多个基站通信的多个接收机。 每个扇区内的基站包括上行链路协调接收过程，其跨扇区或小区边界施加协调的接收技术，以便改善目标终端与每个扇区内的基站之间的上行传输质量。
-
公开(公告)号：US20060008025A1
公开(公告)日：2006-01-12
申请号：US11175430
申请日：2005-07-05
IPC分类号： H04B7/02
CPC分类号： H04L1/0625 , H04L1/0071 , H04L1/0643
摘要： The invention relates generally to the field of signal encoding in a multiple input multiple output system in a wireless communication network. This invention specifically relates to a method of encoding and transmitting symbols in a rate-2 complex symbol per second per Hertz transmission system that achieves a maximum diversity of four for a four transmit antenna system and a diversity of three on a three transmit antenna system. The invention discloses a method of interleaving the complex symbols such that each interleaved symbol comprises information of at least two complex symbols where the complex symbols obtain values from a rotated constellation.
摘要翻译： 本发明一般涉及无线通信网络中的多输入多输出系统中的信号编码领域。 本发明具体涉及以每Hertz传输系统每秒速率2复数符号编码和传输符号的方法，其对于四个发射天线系统实现四个最大分集，三个发射天线系统实现三分之一。 本发明公开了一种对复数符号进行交织的方法，使得每个交错符号包括复数符号从旋转星座获得值的至少两个复符号的信息。
-
公开(公告)号：US20050136943A1
公开(公告)日：2005-06-23
申请号：US10962201
申请日：2004-10-07
CPC分类号： H04B1/7115 , H04B1/7117 , H04B17/21 , H04B17/309
摘要： Techniques for location-assisted wireless communication use real-time location(s) of wireless transceiver(s) together with stored location-indexed channel information to improve communication over a wireless channel between the transceiver(s). The stored channel information includes channel characteristics (e.g., average power, angle-of-arrival, and time delay of multipath components) that are substantially constant in time but vary gradually as a function of location. Current transceiver location(s) are obtained and used to retrieve stored channel characteristics corresponding to the location(s). The channel information may be used at either or both transceiver(s) to improve reception and/or transmission of signals propagating over the wireless channel. For example, reception may be improved by using path angle information to perform spatially structured reception, or using path delay information to perform temporally structured reception, e.g., to assign fingers to multipath components in a RAKE receiver and/or to track time delays of multipath components.
摘要翻译： 用于位置辅助无线通信的技术使用无线收发器的一些或多个实时位置以及存储的位置索引信道信息，以改善通过收发信机之间的无线信道的通信。 所存储的信道信息包括在时间上基本上是恒定的但随着位置的函数而逐渐变化的信道特性（例如，平均功率，到达角度和多径分量的时间延迟）。 获得当前收发器位置并用于检索对应于位置的存储的信道特性。 信道信息可以在两个或两个收发器中使用，以改善在无线信道上传播的信号的接收和/或传输。 例如，可以通过使用路径角度信息来执行空间结构化接收，或者使用路径延迟信息来执行时间上结构化的接收，例如，将手指分配给RAKE接收机中的多路分量和/或跟踪多径的时间延迟，可以改善接收 组件。
-
公开(公告)号：US20050025099A1
公开(公告)日：2005-02-03
申请号：US10929015
申请日：2004-08-26
IPC分类号： H04B7/06 , H04B7/26 , H04L12/28 , H04L12/56 , H04W16/02 , H04W16/12 , H04W16/24 , H04W16/28 , H04W28/12 , H04W74/04 , H04W80/00 , H04W84/04 , H04W88/02 , H04W88/08 , H04B7/204
CPC分类号： H04B7/06 , H04B7/0613 , H04B7/2612 , H04B17/309 , H04H20/71 , H04W16/02 , H04W16/12 , H04W16/24 , H04W16/28 , H04W28/12 , H04W36/24 , H04W72/046 , H04W74/04 , H04W80/00 , H04W84/042 , H04W88/02 , H04W88/08
摘要： The present invention provides methods and apparatus for implementing spatial multiplexing in conjunction with the one or more multiple access protocols during the broadcast of information in a wireless network. A subscriber unit for use in a cellular system is disclosed. The subscriber unit includes a plurality of spatially separate antennas and a transmitter for transmitting a plurality of substreams of a datastream on an assigned channel or slot of a multiple access protocol. The transmitter is arranged to apply each substream to an associated one of the spatially separate antennas.
摘要翻译： 本发明提供了在无线网络中的信息广播期间结合一个或多个多址协议来实现空间复用的方法和装置。 公开了一种用于蜂窝系统的用户单元。 用户单元包括多个空间分离的天线和用于在多址协议的分配的信道或时隙上发送数据流的多个子流的发射机。 发射器被布置成将每个子流应用到相关联的一个空间分离的天线。
-
-
-
-
-
-
-
-
-
搜索结果
45 条记录 (耗时 0.034 秒)
