公开(公告)号：US20110116396A1

公开(公告)日：2011-05-19

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： H04J3/14 ,  H04L12/26

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。

公开(公告)号：US20110080924A1

公开(公告)日：2011-04-07

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。

公开(公告)号：US07813383B2

公开(公告)日：2010-10-12

申请号：US11372930

申请日：2006-03-09

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： H04J3/06

CPC分类号： H04L27/2613 ,  H04L5/0007 ,  H04L5/0048 ,  H04L25/023

摘要： Systems and methods are provided for the transmission of waveforms. 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： 提供了波形传输的系统和方法。 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。

公开(公告)号：US20090245333A1

公开(公告)日：2009-10-01

申请号：US12396144

申请日：2009-03-02

申请人： Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Ashok Mantravadi

发明人： Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Ashok Mantravadi

IPC分类号： H04B1/38

CPC分类号： H04L25/0202

摘要： Methods and apparatus for adapting a channel estimation scheme in a transceiver in a communication system are disclosed to adapt channel estimation to the transceiver environment, particularly for high Doppler environments. The disclosed methods and apparatus effect determination of an estimate of a power delay profile of a channel or a time correlation of the channel, or both. A channel estimation scheme is then determined based on at least one of the determined power delay profile and time correlation of the channel. By basing determination of a channel estimation scheme on the power delay profile and/or the time correlation of the channel, the channel estimation scheme is adapted to the particular environment of the transceiver by accounting for the delay spread of the channel and/or the speed of the transceiver.

摘要翻译： 公开了用于在通信系统中的收发器中适配信道估计方案的方法和装置，以使信道估计适应收发器环境，特别是对于高多普勒环境。 所公开的方法和装置效应确定信道的功率延迟分布的估计或信道的时间相关性，或两者。 然后基于所确定的功率延迟分布和信道的时间相关性中的至少一个来确定信道估计方案。 通过基于信道估计方案对功率延迟分布的确定和/或信道的时间相关性，信道估计方案通过考虑信道的延迟扩展和/或速度来适应收发器的特定环境 的收发器。

公开(公告)号：US20090129511A1

公开(公告)日：2009-05-21

申请号：US12254680

申请日：2008-10-20

申请人： Rajiv Vijayan ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli

发明人： Rajiv Vijayan ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli

IPC分类号： H04L27/06

CPC分类号： H04L25/022 ,  H04L5/0048 ,  H04L23/02 ,  H04L25/0212 ,  H04L25/0228 ,  H04L27/2662 ,  H04L27/2695

摘要： To allow a receiving entity to derive a longer channel estimate while limiting overhead, a transmitting entity transmits a pilot on different groups of subbands in different time intervals. N subbands in the system are arranged into M non-overlapping groups. Each group includes P=N/M subbands that are uniformly distributed across the N subbands. The transmitting entity transmits the pilot on a different subband group in each time interval, and selects all M subband groups in M time intervals based on a pilot staggering pattern. The receiving entity derives (1) an initial impulse response estimate with P channel taps based on the pilot received on one subband group and (2) two longer impulse response estimates with different lengths used for data detection and time tracking. Each longer impulse response estimate may be derived by filtering initial impulse response estimates for a sufficient number of subband groups using a time-domain filter.

摘要翻译： 为了允许接收实体在限制开销的同时导出更长的信道估计，发送实体以不同的时间间隔在不同的子带组上发送导频。 系统中的N个子带被布置成M个非重叠组。 每组包括均匀分布在N个子带上的P = N / M个子带。 发送实体在每个时间间隔中在不同子带组上发送导频，并且基于导频交错模式以M个时间间隔选择所有M个子带组。 接收实体基于在一个子带组上接收到的导频导出（1）具有P信道抽头的初始脉冲响应估计，以及（2）用于数据检测和时间跟踪的两个具有不同长度的较长脉冲响应估计。 可以通过使用时域滤波器对足够数量的子带组的初始脉冲响应估计进行滤波来导出更长的脉冲响应估计。

公开(公告)号：US07457231B2

公开(公告)日：2008-11-25

申请号：US10926884

申请日：2004-08-25

申请人： Rajiv Vijayan ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli

发明人： Rajiv Vijayan ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli

IPC分类号： H04J11/00

CPC分类号： H04L25/022 ,  H04L5/0048 ,  H04L23/02 ,  H04L25/0212 ,  H04L25/0228 ,  H04L27/2662 ,  H04L27/2695

摘要： To allow a receiving entity to derive a longer channel estimate while limiting overhead, a transmitting entity transmits a pilot on different groups of subbands in different time intervals. N subbands in the system are arranged into M non-overlapping groups. Each group includes P=N/M subbands that are uniformly distributed across the N subbands. The transmitting entity transmits the pilot on a different subband group in each time interval, and selects all M subband groups in M time intervals based on a pilot staggering pattern. The receiving entity derives (1) an initial impulse response estimate with P channel taps based on the pilot received on one subband group and (2) two longer impulse response estimates with different lengths used for data detection and time tracking. Each longer impulse response estimate may be derived by filtering initial impulse response estimates for a sufficient number of subband groups using a time-domain filter.

摘要翻译： 为了允许接收实体在限制开销的同时导出较长的信道估计，发送实体以不同的时间间隔在不同的子带组上发送导频。 系统中的N个子带被布置成M个非重叠组。 每组包括均匀分布在N个子带上的P = N / M个子带。 发送实体在每个时间间隔中在不同子带组上发送导频，并且基于导频交错模式以M个时间间隔选择所有M个子带组。 接收实体基于在一个子带组上接收到的导频导出（1）具有P信道抽头的初始脉冲响应估计，以及（2）用于数据检测和时间跟踪的两个具有不同长度的较长脉冲响应估计。 可以通过使用时域滤波器对足够数量的子带组的初始脉冲响应估计进行滤波来导出更长的脉冲响应估计。

公开(公告)号：US20080165908A1

公开(公告)日：2008-07-10

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： H04L7/00

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。

公开(公告)号：US08259865B2

公开(公告)日：2012-09-04

申请号：US12396144

申请日：2009-03-02

申请人： Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Ashok Mantravadi

发明人： Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Ashok Mantravadi

IPC分类号： H04L27/06

CPC分类号： H04L25/0202

摘要： Methods and apparatus for adapting a channel estimation scheme in a transceiver in a communication system are disclosed to adapt channel estimation to the transceiver environment, particularly for high Doppler environments. The disclosed methods and apparatus effect determination of an estimate of a power delay profile of a channel or a time correlation of the channel, or both. A channel estimation scheme is then determined based on at least one of the determined power delay profile and time correlation of the channel. By basing determination of a channel estimation scheme on the power delay profile and/or the time correlation of the channel, the channel estimation scheme is adapted to the particular environment of the transceiver by accounting for the delay spread of the channel and/or the speed of the transceiver.

摘要翻译： 公开了用于在通信系统中的收发器中适配信道估计方案的方法和装置，以使信道估计适应收发器环境，特别是对于高多普勒环境。 所公开的方法和装置效应确定信道的功率延迟分布的估计或信道的时间相关性，或两者。 然后基于所确定的功率延迟分布和信道的时间相关性中的至少一个来确定信道估计方案。 通过基于信道估计方案对功率延迟分布的确定和/或信道的时间相关性，信道估计方案通过考虑信道的延迟扩展和/或速度来适应收发器的特定环境 的收发器。

公开(公告)号：US08165064B2

公开(公告)日：2012-04-24

申请号：US12165653

申请日：2008-07-01

申请人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi

发明人： Krishna Kiran Mukkavilli ,  Ashok Mantravadi

IPC分类号： H04W4/00

CPC分类号： H04L5/0048 ,  H04L1/0057 ,  H04L1/0072 ,  H04L5/0007 ,  H04L5/0053

摘要： A method for communicating transmitter identification in an interlace structure of a communication network system using positioning pilot channels (PPC), comprising: a) encoding pilot information on a first portion of a plurality of subcarriers in a positioning pilot channel symbol for an active transmitter; and b) encoding transmitter identification information on a second portion of a plurality of subcarriers of the symbol; wherein the first portion of the plurality of subcarriers comprises at least first and second interlaces and the second portion of the plurality of subcarriers comprises at least a third interlace; the pilot information is scrambled in the first interlace with a wide area identifier and scrambled in the at least second interlaces with the wide area identifier and a local area identifier; and wherein at least one of the interlace includes the transmitter identification information in the form of one or more transmitter location coordinates in a free interlace.

摘要翻译： 一种用于使用定位导频信道（PPC）在通信网络系统的交错结构中传送发射机识别的方法，包括：a）在有源发射机的定位导频信道符号中的多个子载波的第一部分上编码导频信息; 以及b）在所述符号的多个子载波的第二部分上编码发射机识别信息; 其中所述多个子载波的所述第一部分包括至少第一和第二交织，并且所述多个子载波的所述第二部分包括至少第三交错; 导频信息在具有广域标识符的第一交错中被加扰，并且在具有广域标识符和局域标识符的至少第二交错中加扰; 并且其中所述交错中的至少一个以自由交错的一个或多个发射机位置坐标的形式包括所述发射机识别信息。

公开(公告)号：US20090274099A1

公开(公告)日：2009-11-05

申请号：US12433845

申请日：2009-04-30

申请人： Qiang Gao ,  An Mei Chen ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli ,  Murali Ramaswamy Chari

发明人： Qiang Gao ,  An Mei Chen ,  Ashok Mantravadi ,  Krishna Kiran Mukkavilli ,  Murali Ramaswamy Chari

IPC分类号： H04W8/00

CPC分类号： H04H60/50 ,  G01S5/0226 ,  G01S5/14 ,  H04H20/28 ,  H04H60/51 ,  H04L67/18 ,  H04W4/029 ,  H04W4/18

摘要： Methods and apparatus for communicating transmitter information in a communication network are disclosed. The methods and apparatus communicate transmitter specific information, in particular, which includes location information about network transmitters for use in location or positioning type services. The disclosed methods and apparatus include inserting such transmitter specific information within either a data flow of at least one transmission frame or a control channel in the at least one transmission frame. In addition, a transmitter identifier is encoded in a positioning pilot channel (PPC) within the at least one transmission frame, and the configured transmission frame transmitted to a user device. The user device may use the transmitter specific information of numerous transmitters along with the transmitter identifiers to measure how far it is from the transmitters, and then triangulate to determine position.

摘要翻译： 公开了在通信网络中传送发射机信息的方法和装置。 所述方法和装置特别地传送发射机特定信息，所述信息包括关于用于定位或定位类型业务的网络发射机的位置信息。 所公开的方法和装置包括在至少一个传输帧中的至少一个传输帧或控制信道的数据流内插入这样的发射机特定信息。 此外，发射机标识符被编码在至少一个传输帧内的定位导频信道（PPC）中，并且配置的传输帧被发送到用户设备。 用户设备可以使用多个发射机的发射机特定信息以及发射机标识符来测量它与发射机的距离，然后进行三角测量以确定位置。