-
公开(公告)号：US20110282999A1
公开(公告)日：2011-11-17
申请号：US13190421
申请日：2011-07-25
IPC分类号： G06F15/173
CPC分类号： H04L5/0037 , H04W28/04 , H04W72/04 , H04W76/25
摘要： A method and apparatus are provided to manage the assignment transmission resource of forward and reserve link that is assigned to transmitting entity for a period of time. An indication of a gap is provided whenever the transmitting entity is not transmitting actual data packets (e.g. whole or part of intended data or content), yet the transmitting entity is to maintain the assignment of the allocated resource. For example, an erasure signature packet comprising a first data pattern is transmitted on the assigned resource when there is no actual data to transmit on the assigned resource.
摘要翻译： 提供了一种方法和装置，用于管理分配给发送实体一段时间的前向和后退链路的分配传输资源。 只要发送实体不发送实际数据分组（例如，预期数据或内容的全部或部分），并且发送实体将维护分配的资源的分配，则提供间隙的指示。 例如，当在分配的资源上没有要发送的实际数据时，在分配的资源上发送包括第一数据模式的擦除签名分组。
-
72.发明授权Pilot transmission and channel estimation for an OFDM system with excess delay spread 有权具有超延迟扩展的OFDM系统的导频传输和信道估计公开(公告)号：US08027399B2
公开(公告)日：2011-09-27
申请号：US12855548
申请日：2010-08-12
CPC分类号： H04L25/0226 , H04L5/0007 , H04L5/0048 , H04L25/0202 , H04L25/0212 , H04L27/2607 , H04L27/2647
摘要： Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, the number of pilot subbands is greater than the cyclic prefix length. This “oversampling” may be achieved by using more pilot subbands in each symbol period or different sets of pilot subbands in different symbol periods. In one example, a first set of pilot subands may be received in a first symbol period, and a second set of pilot subands may be received in a second symbol period. The first set of pilot subands and the second set of pilot subbands may be staggered in frequency.
摘要翻译： 描述了具有超延迟扩展的OFDM系统的导频传输和信道估计技术。 为了减轻多余的延迟扩展的有害影响，导频子带的数量大于循环前缀长度。 这种“过采样”可以通过在每个符号周期中使用更多的导频子带或在不同的符号周期内使用不同的导频子带集来实现。 在一个示例中，可以在第一符号周期中接收第一组导频子，并且可以在第二符号周期中接收第二组导频子。 第一组导频子区和第二组导频子带可能会频率交错。
-
公开(公告)号：US07966011B2
公开(公告)日：2011-06-21
申请号：US12054175
申请日：2008-03-24
IPC分类号： H04W24/00
CPC分类号： H04W52/146 , H04W52/10 , H04W52/241 , H04W52/245 , H04W52/246 , H04W52/40
摘要： At a mobile device, a total received power represents signals received from all access points. In order to calculate an appropriate transmit power for communication with a single access point, a mobile device determines a per sector received power level. The mobile device can ascertain a time-domain channel response from each access point pilot signal, ascertain a received digital power lever per sector from each access point pilot signal and, based in part on the digital power level, calculate a received power level from each access point. A per sector received power level can be utilized to conserve battery power and/or to reduce interference in a wireless communications network.
摘要翻译： 在移动设备处，总接收功率表示从所有接入点接收的信号。 为了计算用于与单个接入点通信的适当发射功率，移动设备确定每扇区接收的功率电平。 移动设备可以确定来自每个接入点导频信号的时域信道响应，从每个接入点导频信号确定每扇区接收到的数字功率控制器，并且部分地基于数字功率电平，从每个接入点导频信号计算每个接入点导频信号的接收功率电平 切入点。 可以利用每扇区接收的功率电平来节省电池功率和/或减少无线通信网络中的干扰。
-
公开(公告)号：US20100285741A1
公开(公告)日：2010-11-11
申请号：US12722749
申请日：2010-03-12
IPC分类号： H04B17/02
CPC分类号： H04B7/15578
摘要： A method for controlling gain in a wireless repeater includes providing one or more gain control metrics where the gain control metrics is indicative of a loop gain of the repeater; measuring the one or more gain control metrics; and adjusting a variable gain of the repeater using a gain adjustment step size being a function of at least the loop gain of the repeater as measured by the one or more gain control metrics. In another embodiment, the gain control algorithm block is configured to divide the loop gain of the repeater into multiple gain adjustment control zones. The gain adjustment control zones may include a first zone having a loop gain in a stable operating region and a second zone having a loop gain outside the stable operating region.
摘要翻译： 一种用于控制无线中继器中的增益的方法包括提供一个或多个增益控制度量，其中所述增益控制度量指示所述中继器的环路增益; 测量一个或多个增益控制度量; 以及使用由所述一个或多个增益控制度量测量的至少所述中继器的环路增益的函数的增益调整步长调整所述中继器的可变增益。 在另一实施例中，增益控制算法块被配置为将中继器的环路增益划分为多个增益调整控制区。 增益调整控制区域可以包括在稳定操作区域中具有环路增益的第一区域和在稳定操作区域之外具有环路增益的第二区域。
-
公开(公告)号：US20080205333A1
公开(公告)日：2008-08-28
申请号：US11680233
申请日：2007-02-28
IPC分类号： H04Q7/00
CPC分类号： H04W72/1231 , H04W72/1268
摘要： Systems and methodologies are described that facilitate mitigation of interference through uplink scheduling in a wireless communication environment. Access points can assign multiple terminals to a single tile or segment of shared resource (e.g., a time frequency region) to maximize the number of terminals supported. However, combinations of certain types of terminals can cause a significant increase in interference. In particular, allocating multiple terminals having a relatively high velocity (e.g., terminals located in moving vehicles) to a single tile can cause an unacceptable increase in interference. To mitigate interference, high velocity terminals can be identified. Once identified, terminals can be allocated to the available tiles based at least in part upon avoiding combinations that result in a significant increase in interference.
摘要翻译： 描述了通过无线通信环境中的上行链路调度促进减轻干扰的系统和方法。 接入点可以将多个终端分配给单个瓦片或共享资源段（例如，时间频率区域），以最大化所支持的终端的数量。 然而，某些类型的终端的组合可能导致干扰的显着增加。 特别地，将具有较高速度的多个终端（例如，位于移动车辆中的终端）分配到单个瓦片可能导致不可接受的干扰增加。 为了减轻干扰，可以确定高速终端。 一旦被识别，终端可以至少部分地基于避免导致干扰显着增加的组合而被分配给可用的瓦片。
-
公开(公告)号：US07418046B2
公开(公告)日：2008-08-26
申请号：US11022146
申请日：2004-12-22
CPC分类号： H04L25/0204 , H04L25/0212 , H04L25/0226 , H04L27/261
摘要： Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal, and/or cyclic-shift codes. To obtain a channel estimate for a transmitter using a time-frequency pilot code composed of a time-only code and a frequency-only code, a receiver multiplies a set of received symbols for each symbol period with a set of code values for the frequency-only code to obtain a set of detected symbols and performs an IDFT on the set of detected symbols to obtain an initial impulse response estimate. The receiver performs code matching on multiple initial impulse response estimates derived for multiple symbol periods with the time-only code to obtain a final impulse response estimate for the desired transmitter. The receiver retains the first L channel taps and zeroes out remaining channel taps, where L is the expected channel length.
摘要翻译： 为每个发射机分配一个仅时间导频码，仅频率导频码或用于导频传输的时频导频码。 导频码可以是伪随机，正交和/或循环移位码。 为了使用由时间唯一码和仅频率码构成的时频导频码来获得用于发射机的信道估计，接收机将用于每个符号周期的一组接收符号与频率的一组码值相乘 - 获得一组检测符号的代码，并对检测符号集合执行IDFT以获得初始脉冲响应估计。 接收机对具有多个符号周期的多个初始脉冲响应估计执行码匹配，其中仅使用时间码来获得所需发射机的最终脉冲响应估计。 接收器保留第一个L个通道抽头，并将剩余的通道抽头置零，其中L是预期的通道长度。
-
公开(公告)号：US07145940B2
公开(公告)日：2006-12-05
申请号：US10890718
申请日：2004-07-13
CPC分类号： H04L25/0226 , H04B7/0452 , H04B7/0684 , H04L27/2613
摘要： Efficient pilot transmission schemes for multi-antenna communication systems are described. In general, MISO receivers prefer a pilot transmitted in one spatial direction, and MIMO receivers typically require a pilot transmitted in different spatial directions. In one pilot transmission scheme, a first set of T scaled pilot symbols is generated with a first training vector and transmitted (e.g., continuously) from T transmit antennas, where T>1. If MIMO receiver(s) are to be supported by the system, then at least T−1 additional sets of T scaled pilot symbols are generated with at least T−1 additional training vectors and transmitted from the T transmit antennas. The training vectors are for different (e.g., orthogonal) spatial directions. Each MISO receiver can estimate its MISO channel based on the first set of scaled pilot symbols. Each MIMO receiver can estimate its MIMO channel based on the first and additional sets of scaled pilot symbols.
摘要翻译： 描述了用于多天线通信系统的有效导频传输方案。 通常，MISO接收机优选在一个空间方向上发送的导频，并且MIMO接收机通常需要在不同空间方向上发送的导频。 在一个导频传输方案中，用第一训练向量生成第一组T比例导频符号，并从T个发射天线发射（例如，连续地），其中T> 1。 如果MIMO接收机将被系统支持，则至少T-1个额外的T比例导频符号集合至少产生T-1个附加训练向量并从T个发射天线发射。 训练矢量用于不同的（例如正交的）空间方向。 每个MISO接收机可以基于第一组缩放的导频符号来估计其MISO信道。 每个MIMO接收机可以基于第一个和额外的缩放导频符号集来估计其MIMO信道。
-
78.发明授权公开(公告)号：US09461859B2
公开(公告)日：2016-10-04
申请号：US11261361
申请日：2005-10-27
IPC分类号： H04B3/10 , H04L27/26 , H04W16/28 , H04W72/12 , H04B1/715 , H04L5/00 , H04L25/03 , H04B7/04 , H04B7/12 , H04L1/00 , H04L25/02
CPC分类号： H04L27/2613 , H04B1/715 , H04B7/0413 , H04B7/12 , H04B2001/7154 , H04L1/0026 , H04L5/0023 , H04L5/0051 , H04L5/0058 , H04L25/0204 , H04L25/0216 , H04L25/0222 , H04L25/0226 , H04L25/0228 , H04L25/03866 , H04L27/261 , H04W16/28 , H04W72/1205
摘要： Transmission patterns for pilot symbols transmitted from a mobile station or base station are provided. The pattern allows for improved receipt of the pilot symbols transmitted for frequency selective channels and users. In addition, schemes for improving the ability to multiplex pilot symbols without interference and/or biasing from different mobile stations over the same frequencies and in the same time slots.
-
公开(公告)号：US09225488B2
公开(公告)日：2015-12-29
申请号：US11261158
申请日：2005-10-27
CPC分类号： H04L5/0044 , H04L5/0007 , H04L5/0048 , H04L5/0053
摘要： A shared signaling channel can be used in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system to provide signaling, acknowledgement, and power control messages to access terminals within the system. The shared signaling channel can be assigned to a predetermined number of sub-carriers within any frame. The assignment of a predetermined number of sub-carriers to the shared signaling channel establishes a fixed bandwidth overhead for the channel. The actual sub-carriers assigned to the channel can be varied periodically, and can vary according to a predetermined frequency hopping schedule. The amount of signal power allocated to the signaling channel can vary on a per symbol basis depending on the power requirements of the communication link. The shared signaling channel can direct each message carried on the channel to one or more access terminals. Unicast messages allow the channel power to be controlled per the needs of individual communication links.
摘要翻译： 可以在正交频分多址（OFDMA）通信系统中使用共享信令信道，以向系统内的接入终端提供信令，确认和功率控制消息。 共享信令信道可以被分配给任何帧内的预定数量的子载波。 将预定数量的子载波分配给共享信令信道为信道建立固定的带宽开销。 分配给信道的实际子载波可以周期性地变化，并且可以根据预定的跳频调度而变化。 分配给信令信道的信号功率的量可以根据通信链路的功率要求在每个符号的基础上变化。 共享信令信道可以将信道上承载的每个消息引导到一个或多个接入终端。 单播消息允许根据各个通信链路的需要来控制信道功率。
-
公开(公告)号：US09172453B2
公开(公告)日：2015-10-27
申请号：US11261064
申请日：2005-10-27
申请人： Jibing Wang , Tamer Kadous , Dhananjay Ashok Gore
发明人： Jibing Wang , Tamer Kadous , Dhananjay Ashok Gore
CPC分类号： H04B7/0639 , H04B7/063
摘要： Accordingly, a method and apparatus are provided wherein a receiver system selects a pre-coding matrix, comprising eigen-beamforming weights, to use and provides rank value and matrix index associated with the selected matrix to the transmitter system. The transmitter system upon receiving the rank value and matrix index, determine if the matrix associated with the matrix index provided by the receiver system can be used. If not, them transmitter system selects another matrix for determining eigen-beamforming weights.
摘要翻译： 因此，提供了一种方法和装置，其中接收机系统选择包括特征波束形成权重的预编码矩阵，以使用并向发射机系统提供与所选矩阵相关联的秩值和矩阵索引。 发射机系统在接收到秩值和矩阵索引后，确定是否可以使用与接收机系统提供的矩阵索引关联的矩阵。 如果不是，则它们发射机系统选择用于确定特征波束形成权重的另一矩阵。
-
-
-
-
-
-
-
-
-
搜索结果
127 条记录 (耗时 0.037 秒)