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1. 发明申请

US20110149943A1 TIME TRACKING LOOPS FOR A COMMUNICATION SYSTEM UTILIZING A CYCLIC PREFIX 失效
标题翻译：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。

2. 发明授权

US08416733B2 Time tracking loops for a communication system utilizing a cyclic prefix 失效
标题翻译：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。

3. 发明授权

US09071493B2 Dual frequency tracking loop for OFDMA systems 有权
标题翻译：用于OFDMA系统的双频跟踪环路
公开(公告)号：US09071493B2
公开(公告)日：2015-06-30
申请号：US12824958
申请日：2010-06-28
申请人： Brian C. Banister , Shivratna G. Srinivasan , Matthias Brehler , Sunil Kumar Kandukuri Narayana , Raghu N. Challa
发明人： Brian C. Banister , Shivratna G. Srinivasan , Matthias Brehler , Sunil Kumar Kandukuri Narayana , Raghu N. Challa
IPC分类号： H03D3/24 , H04L27/26 , H03J1/00 , H04L27/00
CPC分类号： H04L27/2657 , H03J1/005 , H04L2027/0055 , H04L2027/0065 , H04L2027/0067
摘要： Methods and apparatus for correcting frequency errors between a carrier frequency of a signal received by a wireless device and a reference frequency local to the device. For certain aspects, such a method generally includes receiving a signal in a receiver having an LO producing a reference frequency, a radio frequency (RF) phase-locked loop (PLL), and a digital rotator, estimating a frequency difference between a carrier frequency of the received signal and the LO reference frequency, and applying the estimated frequency difference to the RF PLL and the digital rotator.
摘要翻译：用于校正由无线设备接收的信号的载波频率与设备本地的参考频率之间的频率误差的方法和装置。对于某些方面，这种方法通常包括在具有产生参考频率的LO的接收机中接收信号，射频（RF）锁相环（PLL）和数字旋转器，估计载波频率的接收信号和LO参考频率，并将估计的频差应用于RF PLL和数字旋转器。

4. 发明申请

US20110158367A1 DUAL FREQUENCY TRACKING LOOP FOR OFDMA SYSTEMS 有权
标题翻译：用于OFDMA系统的双频跟踪环路
公开(公告)号：US20110158367A1
公开(公告)日：2011-06-30
申请号：US12824958
申请日：2010-06-28
申请人： Brian C. Banister , Shivratna G. Srinivasan , Matthias Brehler , Sunil Kumar Kandukuri Narayana , Raghu N. Challa
发明人： Brian C. Banister , Shivratna G. Srinivasan , Matthias Brehler , Sunil Kumar Kandukuri Narayana , Raghu N. Challa
IPC分类号： H03D3/24
CPC分类号： H04L27/2657 , H03J1/005 , H04L2027/0055 , H04L2027/0065 , H04L2027/0067
摘要： Methods and apparatus for correcting frequency errors between a carrier frequency of a signal received by a wireless device and a reference frequency local to the device. For certain aspects, such a method generally includes receiving a signal in a receiver having an LO producing a reference frequency, a radio frequency (RF) phase-locked loop (PLL), and a digital rotator, estimating a frequency difference between a carrier frequency of the received signal and the LO reference frequency, and applying the estimated frequency difference to the RF PLL and the digital rotator.
摘要翻译：用于校正由无线设备接收的信号的载波频率与设备本地的参考频率之间的频率误差的方法和装置。对于某些方面，这种方法通常包括在具有产生参考频率的LO的接收机中接收信号，射频（RF）锁相环（PLL）和数字旋转器，估计载波频率的接收信号和LO参考频率，并将估计的频差应用于RF PLL和数字旋转器。

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