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31. 发明授权

US09008198B2 Methods and apparatus for timing synchronization based on transitional pilot symbols 有权
标题翻译：基于过渡导频符号的定时同步的方法和装置
公开(公告)号：US09008198B2
公开(公告)日：2015-04-14
申请号：US11765428
申请日：2007-06-19
申请人： Bojan Vrcelj , Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi
发明人： Bojan Vrcelj , Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi
IPC分类号： H04K1/10 , H04L27/28 , H04L27/26 , H04L5/00 , H04L7/08 , H04L25/02
CPC分类号： H04L27/2662 , H04L5/0048 , H04L7/08 , H04L25/0216 , H04L25/023 , H04L27/2613 , H04L27/2675 , H04L27/2695
摘要： Methods and apparatus for timing synchronization based on transitional pilot symbols. In an aspect, a method is provided for time tracking synchronization in an OFDM system. The method includes receiving at least one TDM pilot symbol comprising a plurality of modulated sub-carriers that are configured to provide a channel estimate having a length that extends up to a duration of an FFT used for data transmission. The method also includes determining one or both of an instantaneous and averaged channel estimates from the plurality of modulated sub-carriers, and calculating a timing offset based on one or both of the channel estimates. An apparatus includes a receiver configured to receive the at least one TDM pilot symbol, a channel estimator configured to determine the instantaneous and averaged channel estimates, and a time synchronizer configured to calculate a timing offset based on the channel estimates.
摘要翻译：基于过渡导频符号的定时同步的方法和装置。在一方面，提供了一种用于OFDM系统中的时间跟踪同步的方法。该方法包括：接收至少一个TDM导频符号，该TDM导频符号包括多个经调制的子载波，其被配置为提供具有延伸到用于数据传输的FFT的持续时间的长度的信道估计。该方法还包括确定来自多个调制子载波的瞬时和平均信道估计中的一个或两个，以及基于信道估计中的一个或两个来计算定时偏移。一种装置包括被配置为接收所述至少一个TDM导频符号的接收机，被配置为确定瞬时和平均信道估计的信道估计器，以及被配置为基于信道估计来计算定时偏移的时间同步器。

32. 发明授权

US08432933B2 Method for transmission of time division multiplexed pilot symbols to aid channel estimation, time synchronization, and AGC bootstrapping in a multicast wireless system 有权
标题翻译：用于传输时分复用导频符号以辅助多播无线系统中的信道估计，时间同步和AGC引导的方法
公开(公告)号：US08432933B2
公开(公告)日：2013-04-30
申请号：US12896780
申请日：2010-10-01
申请人： Michael Mao Wang , Bojan Vrcelj , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
发明人： Michael Mao Wang , Bojan Vrcelj , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC分类号： H04J3/00
CPC分类号： H04L27/2613 , H04L5/0007 , H04L5/0048 , H04L25/023
摘要： Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.
摘要翻译：提供了用于传输波形以辅助无线网络中的信道估计，定时同步和AGC自举的系统和方法。该方法包括插入位于广域和局域波形之间的转变处的至少一个TDM导频符号，以便于传输块的解码。

33. 发明授权

US08605690B2 Methods and apparatus for time tracking using assistance from TDM pilots in a communication network 有权
标题翻译：在通信网络中使用TDM导频协助进行时间跟踪的方法和装置
公开(公告)号：US08605690B2
公开(公告)日：2013-12-10
申请号：US12917789
申请日：2010-11-02
申请人： Bojan Vrcelj , Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
发明人： Bojan Vrcelj , Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
IPC分类号： H04J3/00 , H04J3/06 , H04B3/10 , H04L7/00
CPC分类号： H04L27/2662 , H04L25/0216 , H04L25/0224 , H04L27/2675 , H04L27/2695
摘要： Methods and apparatus for time tracking using assistance from TDM pilots in a communication network. In an aspect, a method is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The method includes determining a delay spread, and modifying at least one parameter used by the time tracking algorithm based on the delay spread. In another aspect, an apparatus is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The apparatus includes computation logic for determining a delay spread, and control logic for modifying at least one parameter used by the time tracking algorithm based on the delay spread.
摘要翻译：在通信网络中使用TDM导频协助进行时间跟踪的方法和装置。在一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的方法，其中该设备执行时间跟踪算法。该方法包括确定延迟扩展，以及基于延迟扩展修改由时间跟踪算法使用的至少一个参数。在另一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的设备，其中该设备执行时间跟踪算法。该装置包括用于确定延迟扩展的计算逻辑，以及用于基于延迟扩展修改由时间跟踪算法使用的至少一个参数的控制逻辑。

34. 发明授权

US07839831B2 Methods and apparatus for time tracking using assistance from TDM pilots in a communication network 有权
标题翻译：在通信网络中使用TDM导频协助进行时间跟踪的方法和装置
公开(公告)号：US07839831B2
公开(公告)日：2010-11-23
申请号：US11970381
申请日：2008-01-07
申请人： Bojan Vrcelj , Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
发明人： Bojan Vrcelj , Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
IPC分类号： H04J3/00 , H04J3/06 , H04B3/10
CPC分类号： H04L27/2662 , H04L25/0216 , H04L25/0224 , H04L27/2675 , H04L27/2695
摘要： Methods and apparatus for time tracking using assistance from TDM pilots in a communication network. In an aspect, a method is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The method includes determining a delay spread, and modifying at least one parameter used by the time tracking algorithm based on the delay spread. In another aspect, an apparatus is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The apparatus includes computation logic for determining a delay spread, and control logic for modifying at least one parameter used by the time tracking algorithm based on the delay spread.
摘要翻译：在通信网络中使用TDM导频协助进行时间跟踪的方法和装置。在一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的方法，其中该设备执行时间跟踪算法。该方法包括确定延迟扩展，以及基于延迟扩展修改由时间跟踪算法使用的至少一个参数。在另一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的设备，其中该设备执行时间跟踪算法。该装置包括用于确定延迟扩展的计算逻辑，以及用于基于延迟扩展修改由时间跟踪算法使用的至少一个参数的控制逻辑。

35. 发明申请

US20060250937A1 Method for transmission of time division multiplexed pilot symbols to aid channel estimation, time synchronization, and AGC bootstrapping in a multicast wireless system 有权
公开(公告)号：US20060250937A1
公开(公告)日：2006-11-09
申请号：US11372930
申请日：2006-03-09
申请人： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
发明人： Michael Wang , Bojan Vrcelj , Krishna Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC分类号： H04J11/00
CPC分类号： H04L27/2613 , H04L5/0007 , H04L5/0048 , H04L25/023
摘要： Systems and methods are provided for the transmission of waveforms to aid channel estimation, timing synchronization, and AGC bootstrapping in a wireless network. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.

36. 发明授权

US08249116B2 Methods and systems for timing acquisition robust to channel fading 有权
标题翻译：定时采集的方法和系统对信道衰落具有鲁棒性
公开(公告)号：US08249116B2
公开(公告)日：2012-08-21
申请号：US12644856
申请日：2009-12-22
申请人： Bojan Vrcelj , Krishna K. Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
发明人： Bojan Vrcelj , Krishna K. Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC分类号： H04J3/06 , H04J3/00 , H04B7/212
CPC分类号： H04L27/2662 , H04L25/0212 , H04L25/0216 , H04L27/2695
摘要： The embodiments provide mechanisms for synchronizing a receiver with OFDM pilots that are robust in the presence of channel fading conditions. In addition to using instantaneous channel estimate values to locate the first arriving path and last arriving path, the methods calculate time-domain averaged channel estimate values and use those averaged values to determine an average first arriving path and last arriving path. A combination of the instantaneous first arriving path and last arriving path and the average first arriving path and last arriving path may then be used to determine the delay spread and calculate a timing offset to be applied in timing synchronization. The various embodiments introduce improvements under channel fading conditions. Time-domain averaging may be embodied in a flexible DSP processor, or implemented in hardware and/or software. Using both instantaneous and time-averaged channel estimates greatly improves the robustness of time synchronization under channel fading conditions.
摘要翻译：实施例提供了用于使接收机与在存在信道衰落条件的情况下鲁棒的OFDM导频同步的机制。除了使用瞬时信道估计值来定位第一到达路径和最后到达路径之外，该方法还计算时域平均信道估计值，并使用这些平均值来确定平均第一到达路径和最后到达路径。然后可以使用瞬时第一到达路径和最后到达路径以及平均第一到达路径和最后到达路径的组合来确定延迟扩展，并计算要在定时同步中应用的定时偏移。各种实施例在信道衰落条件下引入改进。时域平均可以体现在灵活的DSP处理器中，或者在硬件和/或软件中实现。使用瞬时和时间平均信道估计大大提高了信道衰落条件下时间同步的鲁棒性。

37. 发明申请

US20080260008A1 METHODS AND APPARATUS FOR TIME TRACKING USING ASSISTANCE FROM TDM PILOTS IN A COMMUNICATION NETWORK 有权
标题翻译：在通信网络中使用TDM PILOTS协助进行时间跟踪的方法和装置
公开(公告)号：US20080260008A1
公开(公告)日：2008-10-23
申请号：US11970381
申请日：2008-01-07
申请人： Bojan Vrcelj , Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
发明人： Bojan Vrcelj , Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
IPC分类号： H04B1/707
CPC分类号： H04L27/2662 , H04L25/0216 , H04L25/0224 , H04L27/2675 , H04L27/2695
摘要： Methods and apparatus for time tracking using assistance from TDM pilots in a communication network. In an aspect, a method is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The method includes determining a delay spread, and modifying at least one parameter used by the time tracking algorithm based on the delay spread. In another aspect, an apparatus is provided for time tracking in a device operating on a communication network, wherein the device performs a time tracking algorithm. The apparatus includes computation logic for determining a delay spread, and control logic for modifying at least one parameter used by the time tracking algorithm based on the delay spread.
摘要翻译：在通信网络中使用TDM导频协助进行时间跟踪的方法和装置。在一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的方法，其中该设备执行时间跟踪算法。该方法包括确定延迟扩展，以及基于延迟扩展修改由时间跟踪算法使用的至少一个参数。在另一方面，提供了一种用于在通信网络上操作的设备中进行时间跟踪的设备，其中该设备执行时间跟踪算法。该装置包括用于确定延迟扩展的计算逻辑，以及用于基于延迟扩展修改由时间跟踪算法使用的至少一个参数的控制逻辑。

38. 发明申请

US20100246564A1 METHODS AND SYSTEMS FOR TIMING ACQUISITION ROBUST TO CHANNEL FADING 有权
标题翻译：用于定时采集的方法和系统对信道渐弱的鲁棒性
公开(公告)号：US20100246564A1
公开(公告)日：2010-09-30
申请号：US12644856
申请日：2009-12-22
申请人： Bojan Vrcelj , Krishna K. Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
发明人： Bojan Vrcelj , Krishna K. Mukkavilli , Raghuraman Krishnamoorthi , Ashok Mantravadi
IPC分类号： H04J3/06 , H04L27/28
CPC分类号： H04L27/2662 , H04L25/0212 , H04L25/0216 , H04L27/2695
摘要： The embodiments provide mechanisms for synchronizing a receiver with OFDM pilots that are robust in the presence of channel fading conditions. In addition to using instantaneous channel estimate values to locate the first arriving path and last arriving path, the methods calculate time-domain averaged channel estimate values and use those averaged values to determine an average first arriving path and last arriving path. A combination of the instantaneous first arriving path and last arriving path and the average first arriving path and last arriving path may then be used to determine the delay spread and calculate a timing offset to be applied in timing synchronization. The various embodiments introduce improvements under channel fading conditions. Time-domain averaging may be embodied in a flexible DSP processor, or implemented in hardware and/or software. Using both instantaneous and time-averaged channel estimates greatly improves the robustness of time synchronization under channel fading conditions.
摘要翻译：实施例提供了用于使接收机与存在信道衰落条件时鲁棒的OFDM导频同步的机制。除了使用瞬时信道估计值来定位第一到达路径和最后到达路径之外，该方法还计算时域平均信道估计值，并使用这些平均值来确定平均第一到达路径和最后到达路径。然后可以使用瞬时第一到达路径和最后到达路径以及平均第一到达路径和最后到达路径的组合来确定延迟扩展，并计算要在定时同步中应用的定时偏移。各种实施例在信道衰落条件下引入改进。时域平均可以体现在灵活的DSP处理器中，或者在硬件和/或软件中实现。使用瞬时和时间平均信道估计大大提高了信道衰落条件下时间同步的鲁棒性。

39. 发明授权

US08165167B2 Time tracking for a communication system 有权
标题翻译：通讯系统的时间跟踪
公开(公告)号：US08165167B2
公开(公告)日：2012-04-24
申请号：US11371536
申请日：2006-03-08
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Rajiv Vijayan , Michael Mao Wang
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Rajiv Vijayan , Michael Mao Wang
IPC分类号： H04J11/00 , H04L7/00
CPC分类号： H04L27/2662 , H04L5/0007 , H04L5/0048 , H04L25/0216 , H04L25/022 , H04L25/0228 , H04L27/261 , H04L27/265 , H04L27/2665 , H04L27/2679
摘要： A method for characterizing a communication channel is disclosed. A detection window is moved through a channel profile to accumulate tap energies in the channel profile within the detection window into an accumulated energy curve. A peak at a maximum in the accumulated energy curve is determined. A band relative to the accumulated energy curve is defined. A first arriving path (FAP) is determined using a trailing edge found near a second end of a zone in the accumulated energy curve. A leading edge is found near a first end of the zone of the accumulated energy curve. The last arriving path (LAP) is determined using the leading edge. The band defines a zone of the accumulated energy curve at or near the maximum that is within the band.
摘要翻译：公开了一种用于表征通信信道的方法。检测窗口通过通道轮廓移动，以将检测窗口内的通道轮廓中的抽头能量累积为累积的能量曲线。确定累积能量曲线中最大值的峰值。定义相对于累积能量曲线的带。使用在累积能量曲线中的区域的第二端附近发现的后沿来确定第一到达路径（FAP）。在累积能量曲线的区域的第一端附近发现前沿。最后到达路径（LAP）使用前沿确定。频带定义在频带内或附近的最大值处的累积能量曲线的区域。

40. 发明授权

US08428001B2 Timing corrections in a multi carrier system and propagation to a channel estimation time filter 有权
标题翻译：多载波系统中的定时校正和传播到信道估计时间滤波器
公开(公告)号：US08428001B2
公开(公告)日：2013-04-23
申请号：US11373764
申请日：2006-03-09
申请人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli
发明人： Bojan Vrcelj , Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli
IPC分类号： H04B7/212
CPC分类号： H04L25/0232 , H04L25/0212 , H04L25/0224 , H04L25/025 , H04L27/2662 , H04L27/2665
摘要： Systems and methods are provided for determining and applying timing corrections in a digital communications system. In an aspect, a timing correction method is provided for a multi-carrier system. This includes aligning two or more symbols with respect to each other from a symbol subset in order to account for timing differences between the symbols. The symbol alignment is first carried out to generate channel estimates for data demodulation. The channel estimates, thus generated, along with the timing alignment information are in turn used for determining timing corrections-to be applied to future symbols.
摘要翻译：提供了用于在数字通信系统中确定和应用定时校正的系统和方法。在一方面，为多载波系统提供定时校正方法。这包括从符号子集彼此对准两个或更多个符号，以便考虑符号之间的时序差异。首先执行符号对齐以产生用于数据解调的信道估计。由此生成的信道估计以及定时对准信息又用于确定定时校正，以应用于将来的符号。

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