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    METHOD AND APPARATUS FOR PERFORMING FREQUENCY SCAN FOR WIRELESS SYSTEMS WITH VARIABLE CHANNEL BANDWIDTH
    5.
    发明申请
    METHOD AND APPARATUS FOR PERFORMING FREQUENCY SCAN FOR WIRELESS SYSTEMS WITH VARIABLE CHANNEL BANDWIDTH 审中-公开
    用于对具有可变通道带宽的无线系统进行频谱扫描的方法和装置

    公开(公告)号：US20130155883A1

    公开(公告)日：2013-06-20

    申请号：US13610652

    申请日：2012-09-11

    申请人： Supratik Bhattacharjee ,  Shivratna G. Srinivasan ,  Brian C. Banister ,  Hisham Mahmoud

    发明人： Supratik Bhattacharjee ,  Shivratna G. Srinivasan ,  Brian C. Banister ,  Hisham Mahmoud

    IPC分类号： H04W48/16 ,  H04J3/00 ,  H04W24/00

    CPC分类号： H04W48/16

    摘要： Techniques for performing a frequency scan to detect wireless systems operating on frequency channels with variable bandwidths are disclosed. In one aspect, a user equipment (UE) performs a frequency scan for a plurality of frequency channels and measures the received power of each frequency channel based on a center frequency and a bandwidth of the frequency channel. The UE identifies candidate frequency channels for acquisition based on the results of the frequency scan. In another aspect, a frequency scan of a band is performed by partitioning the band into multiple segments, measuring received powers of subcarriers or raster frequencies within each segment, and concatenating received powers of subcarriers or raster frequencies for all segments. A frequency scan is then performed based on the concatenated results for the multiple segments.

    摘要翻译： 公开了用于执行频率扫描以检测在具有可变带宽的频道上操作的无线系统的技术。 一方面，用户设备（UE）对多个频道执行频率扫描，并且基于频率信道的中心频率和带宽测量每个频道的接收功率。 基于频率扫描的结果，UE识别用于获取的候选频道。 在另一方面，通过将频带划分成多个段，测量每个段内的子载波的接收功率或光栅频率，以及连接所有段的子载波或光栅频率的接收功率来执行频带的频率扫描。 然后基于多个段的级联结果执行频率扫描。

    Time tracking loops for a communication system utilizing a cyclic prefix
    8.
    发明授权
    Time tracking loops for a communication system utilizing a cyclic prefix 失效
    利用循环前缀的通信系统的时间跟踪循环

    公开(公告)号：US08416733B2

    公开(公告)日：2013-04-09

    申请号：US12825146

    申请日：2010-06-28

    申请人： Shivratna G. Srinivasan ,  Michael L. McCloud ,  Remi J. Gurski ,  Sunil Kumar Kandukuri Narayana

    发明人： Shivratna G. Srinivasan ,  Michael L. McCloud ,  Remi J. Gurski ,  Sunil Kumar Kandukuri Narayana

    IPC分类号： H04B7/212

    CPC分类号： H04L27/2662 ,  H04L25/0212 ,  H04L27/2665

    摘要： Techniques for performing time tracking in a communication system utilizing a cyclic prefix are described. In an aspect, a receiver may detect for large timing errors based on early and late received samples obtained with early and late FFT windows, respectively. The receiver may derive first and second channel impulse response (CIR) estimates based on the early and late received samples, respectively, determine an early channel energy based on the first CIR estimate, determine a late channel energy based on the second CIR estimate, compute an update amount based on the early and late channel energies, and update the FFT window position based on the update amount. In another aspect, the receiver may perform time tracking with an inner time tracking loop (TTL) and an outer TTL. The receiver may update the FFT window position in coarse steps with the outer TTL and in fine steps with the inner TTL.

    摘要翻译： 描述了在利用循环前缀的通信系统中执行时间跟踪的技术。 在一方面，接收机可以分别基于早期和晚期FFT窗口获得的早期和晚期接收样本来检测大的定时误差。 接收机可以基于早期和晚期接收的采样分别导出第一和第二信道脉冲响应（CIR）估计，基于第一CIR估计确定早期信道能量，基于第二CIR估计确定后期信道能量，计算 基于早期和晚期信道能量的更新量，并且基于更新量来更新FFT窗口位置。 在另一方面，接收机可以利用内部时间跟踪环（TTL）和外部TTL来执行时间跟踪。 接收机可以以外部TTL以粗略的步骤更新FFT窗口位置，并以内部TTL进行微调。

    TIME TRACKING LOOPS FOR A COMMUNICATION SYSTEM UTILIZING A CYCLIC PREFIX
    9.
    发明申请
    TIME TRACKING LOOPS FOR A COMMUNICATION SYSTEM UTILIZING A CYCLIC PREFIX 失效
    用于使用循环前缀的通信系统的时间跟踪器

    公开(公告)号：US20110149943A1

    公开(公告)日：2011-06-23

    申请号：US12825146

    申请日：2010-06-28

    申请人： Shivratna G. Srinivasan ,  Michael L. McCloud ,  Remi J. Gurski ,  Sunil Kumar Kandukuri Narayana

    发明人： Shivratna G. Srinivasan ,  Michael L. McCloud ,  Remi J. Gurski ,  Sunil Kumar Kandukuri Narayana

    IPC分类号： H04L27/06 ,  H04J1/00

    CPC分类号： H04L27/2662 ,  H04L25/0212 ,  H04L27/2665

    摘要： Techniques for performing time tracking in a communication system utilizing a cyclic prefix are described. In an aspect, a receiver may detect for large timing errors based on early and late received samples obtained with early and late FFT windows, respectively. The receiver may derive first and second channel impulse response (CIR) estimates based on the early and late received samples, respectively, determine an early channel energy based on the first CIR estimate, determine a late channel energy based on the second CIR estimate, compute an update amount based on the early and late channel energies, and update the FFT window position based on the update amount. In another aspect, the receiver may perform time tracking with an inner time tracking loop (TTL) and an outer TTL. The receiver may update the FFT window position in coarse steps with the outer TTL and in fine steps with the inner TTL.

    摘要翻译： 描述了在利用循环前缀的通信系统中执行时间跟踪的技术。 在一方面，接收机可以分别基于早期和晚期FFT窗口获得的早期和晚期接收样本来检测大的定时误差。 接收机可以基于早期和晚期接收的采样分别导出第一和第二信道脉冲响应（CIR）估计，基于第一CIR估计确定早期信道能量，基于第二CIR估计确定后期信道能量，计算 基于早期和晚期信道能量的更新量，并且基于更新量来更新FFT窗口位置。 在另一方面，接收机可以利用内部时间跟踪环（TTL）和外部TTL来执行时间跟踪。 接收机可以以外部TTL以粗略的步骤更新FFT窗口位置，并以内部TTL进行微调。

    TRACKING LOOP ENHANCEMENTS FOR MITIGATING SIGNAL INTERFERENCE AND ADJUSTING SIGNAL POWER
    10.
    发明申请
    TRACKING LOOP ENHANCEMENTS FOR MITIGATING SIGNAL INTERFERENCE AND ADJUSTING SIGNAL POWER 审中-公开
    跟踪信号干扰和调整信号功率的环路增强

    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。