公开(公告)号：US20110267937A1

公开(公告)日：2011-11-03

申请号：US13096667

申请日：2011-04-28

申请人： Taesang Yoo ,  Tao Luo ,  Lu Zhao

发明人： Taesang Yoo ,  Tao Luo ,  Lu Zhao

IPC分类号： H04J3/10

CPC分类号： H04L5/0062 ,  H04J11/005 ,  H04L5/005 ,  H04L5/0073 ,  H04L25/0204 ,  H04L25/0224 ,  H04W24/10

摘要： A method to enhance coverage and/or throughput in a heterogeneous wireless network includes detecting interference between a neighboring cell and a serving cell. The method also includes cancelling the interference using an adaptive technique based on whether the interference has colliding Common Reference Signal (CRS) tones.

摘要翻译： 增强异构无线网络中的覆盖和/或吞吐量的方法包括检测相邻小区与服务小区之间的干扰。 该方法还包括使用基于干扰是否具有冲突公共参考信号（CRS）音调的自适应技术来消除干扰。

公开(公告)号：US20110143672A1

公开(公告)日：2011-06-16

申请号：US12966185

申请日：2010-12-13

申请人： Taesang Yoo ,  Tao Luo ,  Yongbin Wei ,  Hanfang Pan ,  Michael A. Howard

发明人： Taesang Yoo ,  Tao Luo ,  Yongbin Wei ,  Hanfang Pan ,  Michael A. Howard

IPC分类号： H04B15/00

CPC分类号： H04J11/004 ,  H04L25/0206 ,  H04L25/0224 ,  H04L2025/03426

摘要： Certain aspects of the disclosure propose parallel channel estimation and interference cancellation in a wireless communications system. For each common reference signal tone offset, interference cancellation and channel estimation may be performed independently. The proposed channel estimation method may increase performance of a system.

摘要翻译： 本公开的某些方面在无线通信系统中提出并行信道估计和干扰消除。 对于每个公共参考信号色调偏移，可以独立地执行干扰消除和信道估计。 所提出的信道估计方法可以提高系统的性能。

公开(公告)号：US20110116561A1

公开(公告)日：2011-05-19

申请号：US12620866

申请日：2009-11-18

申请人： Taesang Yoo ,  Peter Gaal ,  Tao Luo

发明人： Taesang Yoo ,  Peter Gaal ,  Tao Luo

IPC分类号： H04L27/28

CPC分类号： H04L27/2673 ,  H04L27/2665

摘要： Providing for improved tracking and correction of timing in wireless communications is disclosed herein. By way of example, a first algorithm can be employed to track timing of a wireless signal, based on one dimension of the signal. Additionally, a second algorithm based on a different dimension of the signal can be employed to verify the timing and reduce errors in timing analysis. Various signal dimensions can be employed for the analysis, including cyclic prefix, frequency, channel impulse response, or the like, or a combination thereof. Additionally, different channels of the wireless signal can also be analyzed by the first algorithm and the second algorithm. Furthermore, the second algorithm can be selected to reduce deficiencies identified in the first algorithm, to improve overall timing analysis, reduce undetected timing errors or false errors, and improve timing correction.

摘要翻译： 本文公开了提供无线通信中的改进的定时跟踪和校正。 作为示例，可以采用第一算法来基于信号的一个维度来跟踪无线信号的定时。 另外，可以采用基于信号的不同维度的第二算法来验证定时并减少定时分析中的误差。 可以采用各种信号尺寸进行分析，包括循环前缀，频率，信道脉冲响应等，或其组合。 此外，无线信号的不同信道也可以通过第一算法和第二算法进行分析。 此外，可以选择第二算法以减少在第一算法中识别的缺陷，以改善总体时序分析，减少未检测到的定时误差或错误误差，并且改善定时校正。

公开(公告)号：US20110092231A1

公开(公告)日：2011-04-21

申请号：US12900285

申请日：2010-10-07

申请人： Taesang Yoo ,  Tao Luo

发明人： Taesang Yoo ,  Tao Luo

IPC分类号： H04B15/00

CPC分类号： H04L5/0032 ,  H04B1/7097 ,  H04B15/00 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04J11/005 ,  H04J11/0069 ,  H04L5/0048 ,  H04L27/2657 ,  H04L27/2662 ,  H04W24/02 ,  H04W72/082

摘要： Obtaining a timing reference in wireless communication is facilitated when desiring to communicate with a weak serving base station (such as an evolved NodeB) in the presence of a stronger interfering base station. The user equipment (UE) may track a stronger interfering base station's timing, or the UE may track a timing that is derived by a composite power delay profile (PDP) from multiple base stations. The composite PDP may be constructed by adjusting individual base station PDPs according to a weighting scheme. The timing obtained in such a manner may be used for estimation of the channel of the interfering base station and cancelling interfering signals from the base station. It may also be used to estimate the channel of the serving base station after adding a backoff. The UE may track a stronger interfering base station's frequency, or the UE may track a composite frequency.

摘要翻译： 当在较强的干扰基站的存在下希望与弱服务基站（诸如演进的节点B）进行通信时，便于获得无线通信中的定时参考。 用户设备（UE）可以跟踪更强的干扰基站的定时，或者UE可以跟踪由多个基站由复合功率延迟分布（PDP）导出的定时。 可以通过根据加权方案调整各个基站PDP来构成复合PDP。 以这种方式获得的定时可以用于干扰基站的信道的估计和从基站的抵消干扰信号。 也可以用于在添加退避后估计服务基站的信道。 UE可以跟踪更强的干扰基站的频率，或者UE可以跟踪复合频率。

公开(公告)号：US20100040179A1

公开(公告)日：2010-02-18

申请号：US12191427

申请日：2008-08-14

申请人： Taesang Yoo ,  Yongbin Wei ,  Peter Gaal

发明人： Taesang Yoo ,  Yongbin Wei ,  Peter Gaal

IPC分类号： H04B1/10

CPC分类号： H04L25/0204 ,  H04L25/022 ,  H04L25/0224 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03522

摘要： Aspects describe channel estimation in an OFDM system. Baseline DFT-based channel estimation can be performed and scaling can be applied to mitigate distortion in the DFT-based estimations. In some aspects, baseline DFT-based channel estimation can be performed and tones for which DFT-based estimate is deemed unreliable can have MMSE based processing applied locally. If orthogonal sequence is deemed excessive, orthogonal sequence cancellation can be applied prior to the MMSE based processing.

摘要翻译： 方面描述OFDM系统中的信道估计。 可以执行基于基于DFT的信道估计，并且可以应用缩放来减轻基于DFT的估计中的失真。 在一些方面，可以执行基于基于DFT的信道估计，并且基于DFT的估计被认为不可靠的音调可以在本地应用基于MMSE的处理。 如果认为正交序列过大，则可以在基于MMSE的处理之前应用正交序列消除。

公开(公告)号：US10389479B2

公开(公告)日：2019-08-20

申请号：US13016837

申请日：2011-01-28

申请人： Taesang Yoo ,  Siddhartha Mallik ,  Tao Luo

发明人： Taesang Yoo ,  Siddhartha Mallik ,  Tao Luo

IPC分类号： H04W4/00 ,  H04W72/04 ,  H04L1/00 ,  H04L1/18

摘要： Certain aspects of the present disclosure provide for signaling to expanded capability UEs that may limit the interruption of legacy UEs. According to certain aspects, a base station (e.g., an eNB) may generate and transmit one or more signals containing information that is recognizable by at least one expanded capability UE and identified as invalid by at least one legacy UE. An expanded capability UE may receive such signaling and identifying supplemental information in the signaling, while a legacy UE may regard the signaling as invalid.

公开(公告)号：US09503285B2

公开(公告)日：2016-11-22

申请号：US13195711

申请日：2011-08-01

申请人： Taesang Yoo ,  Tao Luo

发明人： Taesang Yoo ,  Tao Luo

IPC分类号： H04W52/02 ,  H04L25/02 ,  H04J11/00

CPC分类号： H04L25/0204 ,  H04J11/005 ,  H04L25/0224 ,  H04W52/02 ,  Y02D70/00 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/146

摘要： Various aspects disclosed are directed to improvements to channel estimation through more efficient cancelation of neighboring common reference signals (CRS). Cancelation of CRS from other cells allows the user equipment (UE) a better opportunity for accurately detecting the reference signal of the current cell. Alternative aspects have a recursive element that uses previous estimates as the basis for the current channel estimate. The various aspects of the present disclosure generally have two alternative embodiments: (1) initializing the channel estimation for all cells with a previous channel estimate and cancellation of reference signals of non-target cells to accurately update channel estimate of the target cell; and (2) initializing the channel estimate for all cells with a previous channel estimate and cancelation of reference signals of all cells to accurately estimate residual channel estimate of the target cell and update its channel estimate.

摘要翻译： 所公开的各个方面旨在通过更有效地消除相邻公共参考信号（CRS）来改进信道估计。 从其他小区中取消CRS允许用户设备（UE）更准确地检测当前小区的参考信号。 替代方面具有使用先前估计作为当前信道估计的基础的递归因子。 本公开的各个方面通常具有两个替代实施例：（1）利用先前的信道估计和非目标小区的参考信号的消除来初始化所有小区的信道估计，以准确地更新目标小区的信道估计; 和（2）利用先前的信道估计和所有小区的参考信号的消除来初始化所有小区的信道估计，以精确估计目标小区的剩余信道估计并更新其信道估计。

公开(公告)号：US09136953B2

公开(公告)日：2015-09-15

申请号：US13196711

申请日：2011-08-02

申请人： Taesang Yoo ,  Tao Luo ,  Yongbin Wei ,  Siddhartha Mallik

发明人： Taesang Yoo ,  Tao Luo ,  Yongbin Wei ,  Siddhartha Mallik

IPC分类号： H04B17/345

CPC分类号： H04B17/345

摘要： Interference on pilot signals and on data tones can be mismatched. Different types of interference estimates perform differently based on how the mismatch occurs. The resulting interference estimate may thus be inaccurate. Interference estimates based on pilot signals and also on data tones can both be evaluated for reliability. The more reliable of the two can then be selected. If the data tones estimate is selected, the estimate can be calculated from covariance matrices or from traffic-to-pilot ratios.

摘要翻译： 对导频信号和数据音调的干扰可能不匹配。 基于不匹配的发生情况，不同类型的干扰估计可以不同地执行。 所得到的干扰估计可能是不准确的。 可以对可靠性进行评估，基于导频信号和数据音调的干扰估计。 然后可以选择更可靠的两个。 如果选择数据音调估计，则可以从协方差矩阵或从业务到导频比来计算估计。

公开(公告)号：US08817924B2

公开(公告)日：2014-08-26

申请号：US13237469

申请日：2011-09-20

申请人： Siddhartha Mallik ,  Taesang Yoo ,  Tao Luo

发明人： Siddhartha Mallik ,  Taesang Yoo ,  Tao Luo

IPC分类号： H03D1/04 ,  H04B7/00

CPC分类号： H04L25/0224

摘要： Channel estimation is performed in a wireless network through cell/antenna pair ranking and iterative soft cancellation of pilot signals. Cell classification and ordering may be ranked and grouped for purposes of improving performance by dedicating hardware resources to higher priority received signals. A metric may be computed to rank the pairs. One such metric is reference signal (RS) power. Pairs may also be grouped into groups of pairs. Groups may be ordered by time-frequency resource and designated as serving-cell groups or non-serving cell groups. Higher priority pairs may be assigned a higher number of iterations. Higher priority groups may be processed first. Pairs which fall below a certain power threshold may be assigned no iterations. Iterations are distributed among hardware blocks to improve processing efficiency. Iteration numbers and hardware assignments may be modified to reach a desired complexity constraint.

摘要翻译： 通过小区/天线对排序和导频信号的迭代软消除在无线网络中执行信道估计。 为了通过将硬件资源专用于较高优先级的接收信号来提高性能，可以对信元分类和排序进行排序和分组。 可以计算度量来对对进行排序。 一个这样的度量是参考信号（RS）功率。 对也可以分组成对。 组可以按时间频率资源排序并指定为服务小区组或非服务小区组。 较高优先级对可以分配更多的迭代次数。 优先级较高的组可以先处理。 低于一定功率阈值的对可以不被分配。 迭代分布在硬件块之间，以提高处理效率。 可以修改迭代数和硬件分配以达到期望的复杂度约束。

公开(公告)号：US08515440B2

公开(公告)日：2013-08-20

申请号：US13023432

申请日：2011-02-08

申请人： Aleksandar Damnjanovic ,  Taesang Yoo

发明人： Aleksandar Damnjanovic ,  Taesang Yoo

IPC分类号： H04W72/00

CPC分类号： H04W72/085 ,  H04B7/022 ,  H04B7/0626 ,  H04B17/24 ,  H04L1/0026 ,  H04W52/281 ,  H04W52/40 ,  H04W72/082

摘要： When enabled with common reference signal interference cancellation, a user equipment (UE) may still compute a channel state feedback value with consideration of any canceled interfering neighboring signals. When the neighboring cells are determined to be transmitting data during the time for which the channel state feedback value is being computed, the UE is able to derive the channel state feedback value considering those canceled interfering signals. The UE determines whether each neighboring cell is transmitting during the designated time either by obtaining signals that indicate the transmission schedule of the neighboring cells or by detecting the transmission schedule, such as based on the power class of the neighboring cells. If the UE determines that the neighboring cells are transmitting data during this time period, the UE will compute the channel state feedback value including consideration of the canceled interfering signals.

摘要翻译： 当使用公共参考信号干扰消除时，用户设备（UE）仍可以考虑任何取消的干扰相邻信号来计算信道状态反馈值。 当在正在计算信道状态反馈值的时间内确定相邻小区正在发送数据时，UE能够导出考虑到那些被消除的干扰信号的信道状态反馈值。 UE通过获得指示相邻小区的传输调度的信号或者通过基于相邻小区的功率等级来检测传输调度来确定在指定时间期间每个相邻小区是否正在发射。 如果UE在该时间段期间确定相邻小区正在发送数据，则UE将计算包括考虑被消除的干扰信号的信道状态反馈值。