公开(公告)号：US20130107785A1

公开(公告)日：2013-05-02

申请号：US13447067

申请日：2012-04-13

申请人： Kapil Bhattad ,  Tao Luo ,  Taesang Yoo ,  Shivratna G. Srinivasan

发明人： Kapil Bhattad ,  Tao Luo ,  Taesang Yoo ,  Shivratna G. Srinivasan

IPC分类号： H04W4/00 ,  H04H20/71

CPC分类号： H04L27/2665 ,  H04J11/005 ,  H04L27/2675 ,  H04L27/2688 ,  H04L27/2691

摘要： A method, an apparatus, and a computer program product for wireless communication are provided for maintaining a time tracking loop (TTL) to increase an overall signal-to-noise ratio (SNR) of a signal. The signal includes a series of consecutive symbols, received via multiple signal paths with different delays in a subframe. When attempting to decode the signal, only part of a symbol for a signal path may be captured in a fast Fourier transform (FFT) window due to the multiple signal path delays, leading to inter-channel interference (ICI), inter-symbol interference (ISI), and/or power loss. The SNR may be increased by optimizing a FFT window position when decoding the signal. An optimal FFT window position may be based on a subframe type. Moreover, the SNR may be increased by performing a linear operation on samples of the symbol prior to performing the FFT.

摘要翻译： 提供了一种用于无线通信的方法，装置和计算机程序产品，用于维持时间跟踪环（TTL）以增加信号的总体信噪比（SNR）。 该信号包括一系列连续符号，通过在子帧中具有不同延迟的多个信号路径接收。 当尝试对信号进行解码时，由于多路信号路径延迟，只能在快速傅里叶变换（FFT）窗口中捕获信号路径的一部分符号，从而导致信道间干扰（ICI），符号间干扰 （ISI）和/或功率损耗。 可以通过在对信号进行解码时优化FFT窗口位置来增加SNR。 最佳FFT窗口位置可以基于子帧类型。 此外，可以通过对执行FFT之前的符号的采样执行线性运算来增加SNR。

公开(公告)号：US20120044928A1

公开(公告)日：2012-02-23

申请号：US13212829

申请日：2011-08-18

申请人： Kapil Bhattad ,  Tao Luo ,  Taesang Yoo ,  Xiaoxia Zhang ,  Xiliang Luo ,  Ke Liu ,  Durga Prasad Malladi

发明人： Kapil Bhattad ,  Tao Luo ,  Taesang Yoo ,  Xiaoxia Zhang ,  Xiliang Luo ,  Ke Liu ,  Durga Prasad Malladi

IPC分类号： H04J3/06

CPC分类号： H04J11/0083 ,  H04B1/70718 ,  H04L5/0007 ,  H04W28/04 ,  H04W48/16 ,  H04W88/02

摘要： User equipment (UE) associated with synchronous networks operate in a synchronous mode while UEs associated with asynchronous networks operate in an asynchronous mode. When operating in a synchronous mode, a UE can significantly improve performance of synchronization signal detection, data decoding, and tracking loop management by using the interference cancellation (IC) techniques that are not available in an asynchronous mode of operation. Obtaining synchronization indicators and determining the synchronization status of the current network by UE is disclosed. The determination may be based on the synchronization indicator, whether detected through signal detection, signal measurements, signal analysis, or the like.

摘要翻译： 与同步网络相关联的用户设备（UE）以同步模式工作，而与异步网络相关联的UE以异步模式工作。 当在同步模式下工作时，UE可以通过使用在异步操作模式中不可用的干扰消除（IC）技术来显着提高同步信号检测，数据解码和跟踪环路管理的性能。 公开了获取同步指示符并确定UE当前网络的同步状态。 该确定可以基于通过信号检测，信号测量，信号分析等检测的同步指示器。

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：US20110141927A1

公开(公告)日：2011-06-16

申请号：US12816708

申请日：2010-06-16

申请人： Tao Luo ,  Dung Ngoc Doan ,  Taesang Yoo ,  Xiaoxia Zhang ,  Kibeom Seong

发明人： Tao Luo ,  Dung Ngoc Doan ,  Taesang Yoo ,  Xiaoxia Zhang ,  Kibeom Seong

IPC分类号： H04L12/26 ,  H04W4/00

CPC分类号： H04L25/03343 ,  H04B7/0413 ,  H04B7/0456 ,  H04L5/0048 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Systems and methodologies are described that facilitate precoding signals transmitted over downlink control channels to provide transmit diversity. A dedicated reference signal (DRS) related to a wireless device can additionally be precoded such that the wireless device can determine a precoder or related parameters based at least in part on performing a channel estimate for the precoded DRS signal. The wireless device can utilize the determined precoder or related parameters to decode precoded signals received over downlink control channel resources. Additionally or alternatively, an access point can signal a sequence of precoders to the wireless device. The access point can cycle through the sequence of precoders to precode signals for transmission over downlink control channel resources, and the wireless device can decode the signals based at least in part on similarly cycling through the precoders for received signals.

摘要翻译： 描述了促进预编码在下行链路控制信道上发送的信号以提供发射分集的系统和方法。 可以另外对与无线设备相关的专用参考信号（DRS）进行预编码，使得无线设备可以至少部分地基于对预编码的DRS信号执行信道估计来确定预编码器或相关参数。 无线设备可以利用所确定的预编码器或相关参数来解码通过下行链路控制信道资源接收的预编码信号。 附加地或替代地，接入点可以向无线设备发送一系列预编码器。 接入点可以循环通过预编码器序列来预编码信号以在下行链路控制信道资源上传输，并且无线设备可以至少部分地基于类似地循环通过用于接收信号的预编码器来对信号进行解码。

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：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：US09178640B2

公开(公告)日：2015-11-03

申请号：US13212829

申请日：2011-08-18

申请人： Kapil Bhattad ,  Tao Luo ,  Taesang Yoo ,  Xiaoxia Zhang ,  Xiliang Luo ,  Ke Liu ,  Durga Prasad Malladi

发明人： Kapil Bhattad ,  Tao Luo ,  Taesang Yoo ,  Xiaoxia Zhang ,  Xiliang Luo ,  Ke Liu ,  Durga Prasad Malladi

IPC分类号： H04W56/00 ,  H04J11/00 ,  H04B1/707 ,  H04L5/00 ,  H04W28/04 ,  H04W48/16 ,  H04W88/02

CPC分类号： H04J11/0083 ,  H04B1/70718 ,  H04L5/0007 ,  H04W28/04 ,  H04W48/16 ,  H04W88/02

摘要： User equipment (UE) associated with synchronous networks operate in a synchronous mode while UEs associated with asynchronous networks operate in an asynchronous mode. When operating in a synchronous mode, a UE can significantly improve performance of synchronization signal detection, data decoding, and tracking loop management by using the interference cancellation (IC) techniques that are not available in an asynchronous mode of operation. Obtaining synchronization indicators and determining the synchronization status of the current network by UE is disclosed. The determination may be based on the synchronization indicator, whether detected through signal detection, signal measurements, signal analysis, or the like.

摘要翻译： 与同步网络相关联的用户设备（UE）以同步模式工作，而与异步网络相关联的UE以异步模式工作。 当在同步模式下工作时，UE可以通过使用在异步操作模式中不可用的干扰消除（IC）技术来显着提高同步信号检测，数据解码和跟踪环路管理的性能。 公开了获取同步指示符并确定UE当前网络的同步状态。 该确定可以基于通过信号检测，信号测量，信号分析等检测的同步指示器。

公开(公告)号：US09144037B2

公开(公告)日：2015-09-22

申请号：US12853168

申请日：2010-08-09

申请人： Kibeom Seong ,  Tao Luo ,  Taesang Yoo ,  Xiaoxia Zhang ,  Dung Ngoc Doan

发明人： Kibeom Seong ,  Tao Luo ,  Taesang Yoo ,  Xiaoxia Zhang ,  Dung Ngoc Doan

IPC分类号： H04B7/00 ,  H04W52/32 ,  H04L1/00 ,  H04W52/24 ,  H04W72/08 ,  H04W84/04

CPC分类号： H04W52/322 ,  H04L1/0045 ,  H04L1/0069 ,  H04L1/0072 ,  H04W52/244 ,  H04W72/082 ,  H04W84/045

摘要： Systems and methodologies are described that facilitate controlling interference in a heterogeneous wireless communication environment. A Physical Broadcast Channel (PBCH) transmission from an interfering base station can be punctured based upon a puncturing pattern as a function of a cell identifier (ID) and a transmit time. Puncturing can be effectuated by applying power control. Thus, a punctured symbol or subframe can have a reduced transmit power or a transmit power set to zero. Further, the puncturing pattern can be defined on a subframe basis or on a symbol basis.

摘要翻译： 描述了便于控制异构无线通信环境中的干扰的系统和方法。 可以基于作为小区标识符（ID）和发送时间的函数的删截模式来对来自干扰基站的物理广播信道（PBCH）传输进行删截。 通过施加电源控制可以实现穿刺。 因此，打孔的符号或子帧可以具有降低的发射功率或设置为零的发射功率。 此外，可以基于子帧或基于符号来定义删截图案。