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11. 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。

12. 发明申请

US20090245154A1 SIGNALING PARAMETERS CHANNEL PROCESSING 审中-公开
标题翻译：信号参数信道处理
公开(公告)号：US20090245154A1
公开(公告)日：2009-10-01
申请号：US12334436
申请日：2008-12-12
申请人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Durk L. van Veen , Murali Ramaswamy Chari , Raghuraman Krishnamoorthi , Rajeev Krishnamurthi , Fuyun Ling
发明人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Durk L. van Veen , Murali Ramaswamy Chari , Raghuraman Krishnamoorthi , Rajeev Krishnamurthi , Fuyun Ling
IPC分类号： H04H20/71 , H04J11/00
CPC分类号： H04L23/02 , H04L5/0053 , H04L25/0206 , H04L25/0218 , H04L25/023 , H04L27/2613 , H04L27/2647
摘要： In a multicasts wireless telecommunication system providing an aggregation of one or more independent data components as a flow, wherein the OIS is located at the latch point of the beginning of the superframe, and the OIS programming is latched at the superframe boundary, the improvement of deriving signal parameter information from Signaling Parameter Channel (SPC) symbols transmitted in a Forward Link only (FLO) network by deriving a time domain channel estimate by assuming each of the combinations for the signal parameter field in the scrambler seed and picking the signal parameter combination that yields the most energy in the time domain above a threshold value.
摘要翻译：在提供作为流的一个或多个独立数据组件的聚合的组播无线电信系统中，其中OIS位于超帧开始的锁存点处，并且OIS编程在超帧边界处被锁存，通过通过假设加扰器种子中的信号参数字段的每个组合并且选择信号参数组合来导出时域信道估计，从在仅前向链路（FLO）网络中发送的信令参数信道（SPC）符号中导出信号参数信息其在时域中产生的能量大于阈值以上。

13. 发明申请

US20090028256A1 METHOD AND APPARATUS FOR SENSING SIGNALING PARAMETERS IN A WIRELESS COMMUNICATIONS NETWORK 有权
标题翻译：用于无线通信网络中传感信号参数的方法与装置
公开(公告)号：US20090028256A1
公开(公告)日：2009-01-29
申请号：US11834653
申请日：2007-08-06
申请人： Durk L. van Veen , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Krishna Kiran Mukkavilli , Fuyun Ling
发明人： Durk L. van Veen , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Krishna Kiran Mukkavilli , Fuyun Ling
IPC分类号： H04L27/28
CPC分类号： H04L27/2613 , H04L5/0007 , H04L5/0044 , H04L5/0048 , H04L5/0053 , H04L5/008 , H04L5/0094 , H04L27/2607 , H04L27/2626 , H04L27/2628 , H04L27/2647 , H04L27/2656
摘要： A new channel is added to FLO networks that carries embedded signaling parameter information. The design is such that regardless of the actual values of the signaling parameters conveyed, a receiver will be able to demodulate this new channel. Moreover, the addition of the new channel does not render a FLO network that has been so configured to not be backwards-compatible with existing devices.
摘要翻译：一个新的信道被添加到携带嵌入式信令参数信息的FLO网络中。这种设计使得无论传达的信令参数的实际值如何，接收机将能够解调这个新的信道。此外，添加新频道并不会使FLO网络被配置为不与现有设备向后兼容。

14. 发明申请

US20080123540A1 METHODS AND APPARATUS FOR SIGNAL AND INTERFERENCE ENERGY ESTIMATION IN A COMMUNICATION SYSTEM 有权
标题翻译：通信系统中信号和干扰能量估计的方法和装置
公开(公告)号：US20080123540A1
公开(公告)日：2008-05-29
申请号：US11563627
申请日：2006-11-27
申请人： Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
发明人： Ashok Mantravadi , Fuyun Ling , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi
IPC分类号： H04J1/16
CPC分类号： H04B1/1027
摘要： Methods and apparatus for signal and interference energy estimation in a communication system. In an aspect, a method includes setting a threshold value, and comparing a channel estimate to the threshold value to determine an interference estimate (Iest). The method also includes averaging the interference estimate (Iest) to determine average channel interference (Ic), and determining interference energy (I) based on the interference estimate (Iest) and the average channel interference (Ic). In another aspect, an apparatus includes threshold logic configured to set a threshold value and compare a channel estimate to the threshold value to determine an interference estimate (Iest). The apparatus includes averaging logic configured to average the interference estimate (Iest) to determine average channel interference (Ic), and summing logic configured to determine interference energy (I) based on the interference estimate (Iest) and average channel interference (Ic).
摘要翻译：通信系统中信号和干扰能量估计的方法和装置。一方面，一种方法包括设置阈值，以及将信道估计与阈值进行比较，以确定干扰估计（I est）。该方法还包括对干扰估计进行平均以确定平均信道干扰（I SUB），以及基于干扰估计（I）来确定干扰能量（I）＆lt; SUB＆gt;）和平均信道干扰（I SUB）。在另一方面，一种装置包括阈值逻辑，其配置成设置阈值并将信道估计与阈值进行比较以确定干扰估计（I est）。所述装置包括被配置为平均干扰估计（I＆gt;）以确定平均信道干扰（I SUB）的平均逻辑，以及被配置为确定干扰能量（I）基于干扰估计（I EST）和平均信道干扰（I SUB）。

15. 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。

16. 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。

17. 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。

18. 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。

19. 发明申请

US20100002785A1 ADAPTIVE THRESHOLDING FOR OFDM CHANNEL ESTIMATION 有权
标题翻译： OFDM信道估计的自适应阈值
公开(公告)号：US20100002785A1
公开(公告)日：2010-01-07
申请号：US12250135
申请日：2008-10-13
申请人： Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajeev Krishnamurthi
发明人： Ashok Mantravadi , Krishna Kiran Mukkavilli , Raghuraman Krishnamoorthi , Rajeev Krishnamurthi
IPC分类号： H04L27/28
CPC分类号： H04L25/0218 , H04L5/0007 , H04L25/0204 , H04L25/022 , H04L25/0224
摘要： An adaptive thresholding technique eliminates suboptimum threshold values by adjusting for varying channel conditions to eliminate interference where no channel energy is present, without discarding viable taps having useful channel energy. The adaptive thresholding technique adaptively optimizes receive threshold values for both wide and local area channels based only on measured C/I ratios 300. Thresholds are calculated based on instantaneous C/I estimates and/or weighted average C/I estimates calculated from WID/LID energies obtained from the current superframe WIC/LIC symbols respectively. In alternate embodiments, thresholds are calculated based on instantaneous C/I estimates and/or weighted average C/I estimates calculated from WTPC and LTPC symbols for the wide and local area channels, respectively The present adaptive thresholding technique dynamically reduces the threshold as the C/I estimate increases to mitigate performance degradation due to removal of weak signal taps. There is a separate threshold for each of the 12 coding and modulation modes supported by an exemplary receiver.
摘要翻译：自适应阈值技术通过调整不同的信道条件来消除次优阈值，以消除不存在信道能量的干扰，而不丢弃具有有用信道能量的可行分接头。自适应阈值技术仅基于测量的C / I比300自适应地优化宽和局域信道的接收阈值。阈值基于从WID / LID计算的瞬时C / I估计和/或加权平均C / I估计来计算从当前超帧WIC / LIC符号获得的能量。在替代实施例中，基于针对宽和局域信道的WTPC和LTPC符号计算的瞬时C / I估计和/或加权平均C / I估计来计算阈值。当前自适应阈值技术动态地将阈值设置为C /我估计增加以减轻由于去除弱信号抽头而导致的性能下降。对于由示例性接收机支持的12个编码和调制模式中的每一个，存在单独的阈值。

20. 发明申请

US20090028100A1 METHODS AND APPARATUS FOR TRANSMITTER IDENTIFICATION IN A WIRELESS NETWORK 审中-公开
标题翻译：无线网络中发射机识别的方法和设备
公开(公告)号：US20090028100A1
公开(公告)日：2009-01-29
申请号：US11834654
申请日：2007-08-06
申请人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari
发明人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari
IPC分类号： H04Q7/00 , H04L27/28
CPC分类号： H04L5/0007 , H04L5/0048 , H04L25/0224 , H04L27/2613
摘要： Methods and apparatus for transmitter identification in a wireless network are disclosed. In an example, a method is provided that encodes pilot information on a first portion of a number of subcarriers in a symbol within a pilot positioning channel for an active transmitter. The method further includes encoding transmitter identification information on a second dedicated portion of the number of subcarriers of the symbol. The method also encompasses including a transmitter allocation field that signals the number of succeeding symbols that will be used by the transmitter for transmitting any other information in an interference free manner. In another example, a method is provided that receives a symbol having a number of subcarriers from a transmitter. A channel estimate and an energy measurement of the symbol using a first portion of the subcarriers. A dedicated second portion of the number of subcarriers in the symbol are then decoded to determine the transmitter identification information.
摘要翻译：公开了用于无线网络中的发射机识别的方法和装置。在一个示例中，提供了一种方法，其对于有源发射机的导频定位信道内的符号中的多个子载波的第一部分上的导频信息进行编码。该方法还包括在符号的子载波数的第二专用部分上编码发射机识别信息。该方法还包括发射机分配字段，其指示将由干扰自由方式发送用于发送任何其它信息的发射机将使用的后续符号的数量。在另一示例中，提供了一种从发射机接收具有多个子载波的符号的方法。使用子载波的第一部分的信号估计和符号的能量测量。然后对符号中的子载波数量的专用第二部分进行解码以确定发射机识别信息。

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