公开(公告)号：US20060133388A1

公开(公告)日：2006-06-22

申请号：US11021310

申请日：2004-12-22

申请人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

发明人： Michael Wang ,  Bojan Vrcelj ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi ,  Rajiv Vijayan

IPC分类号： H04L12/56

CPC分类号： H04L5/0048 ,  H04L5/0007 ,  H04L5/0083 ,  H04L27/261

摘要： The embodiments utilize OFDM symbols to communicate network IDs. The IDs are encoded into symbols utilizing the network IDs as seeds to scramble respective pilots that are then transmitted by utilizing the symbols. The pilots can be structured into a single OFDM symbol and/or multiple OFDM symbols. The single symbol structure for transmitting the network IDs is independent of the number of network ID bits and minimizes frequency offset and Doppler effects. The multiple symbol structure allows a much coarser timing accuracy to be employed at the expense of transmitting additional symbols. Several embodiments employ a search function to find possible network ID candidates from a transmitted symbol and a selection function to find an optimum candidate from a network ID candidate list.

摘要翻译： 这些实施例利用OFDM符号来传送网络ID。 ID被编码成使用网络ID作为种子的符号，以对通过利用符号进行发送的各个导频进行加扰。 导频可以被构造成单个OFDM符号和/或多个OFDM符号。 用于发送网络ID的单个符号结构与网络ID比特数无关，并且使频偏和多普勒效应最小化。 多符号结构允许以牺牲传输附加符号为代价采用更粗糙的定时精度。 几个实施例采用搜索功能来从发送的符号和选择功能中找到可能的网络ID候选，以从网络ID候选列表中找到最佳候选。

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：US20090080378A1

公开(公告)日：2009-03-26

申请号：US12055981

申请日：2008-03-26

申请人： Binita Gupta ,  An Mei Chen ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Binita Gupta ,  An Mei Chen ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04W40/02

CPC分类号： H04W72/005 ,  H04H20/06 ,  H04H20/22 ,  H04H20/42 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0091 ,  H04W16/02

摘要： Methods and apparatus for RF channel switching in a multi-frequency network. In an aspect, a method includes identifying a local area operations infrastructure (LOI) in the multi-frequency network, generating a channel description message that associates at least one descrambling sequence identifier with each RF channel associated with the LOI, respectively, and distributing the CDM over the LOI. In another aspect, a method includes receiving a CDM that associates at least one descrambling sequence identifier with each RF channel available in a LOI, detecting an RF channel switch event that identifies a selected RF channel, determining a selected descrambling sequence identifier from the CDM based on the selected RF channel, switching to the selected RF channel wherein the selected descrambling sequence identifier identifies a selected descrambling sequence to descramble desired content carried on the selected RF channel, and acquiring the desired content on the selected RF channel.

摘要翻译： 多频网络中RF信道切换的方法和装置。 一方面，一种方法包括识别多频网络中的局域操作基础结构（LOI），生成分别将至少一个解扰序列标识符与与LOI相关联的每个RF信道相关联的信道描述消息，并分发 CDM超过LOI。 在另一方面，一种方法包括接收将至少一个解扰序列标识符与LOI中可用的每个RF信道相关联的CDM，检测识别所选RF信道的RF信道切换事件，从基于CDM确定所选解扰序列标识符 在所选择的RF信道上，切换到所选择的RF信道，其中所选择的解扰序列标识符识别所选择的解扰序列，以对所选择的RF信道上承载的期望内容进行解扰，以及在所选择的RF信道上获取所需的内容。

公开(公告)号：US20090029705A1

公开(公告)日：2009-01-29

申请号：US12141840

申请日：2008-06-18

申请人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

发明人： Binita Gupta ,  Linbo Li ,  Raghuraman Krishnamoorthi ,  Ashok Mantravadi

IPC分类号： H04W36/00 ,  H04B1/18

CPC分类号： H04W48/18 ,  H04W28/18

摘要： Methods and apparatus for service acquisition in a multi-frequency network. In an aspect, a method is provided for service acquisition in a multi-frequency network. The method includes detecting a service acquisition trigger event and identifying a selected RF channel from an acquisition RF list based on signal strength, wherein the acquisition RF list identifies RF channels in one or more local operations infrastructures (LOIs) of the multi-frequency network. The method also includes acquiring a wide system on the selected RF channel, removing the selected RF channel from the acquisition RF list if the wide system can not be acquired on the selected RF channel, and repeating said operations of identifying, acquiring and removing until the wide system is acquired on the selected RF channel or a system acquisition timeout occurs.

摘要翻译： 多频网络服务采集方法与装置。 在一方面，提供了一种用于多频网络中的服务获取的方法。 该方法包括基于信号强度检测服务获取触发事件和从获取RF列表识别所选择的RF信道，其中所述获取RF列表识别所述多​​频网络的一个或多个本地操作基础设施（LOI）中的RF信道。 该方法还包括在所选择的RF信道上获取宽系统，如果在所选择的RF信道上不能获取宽系统，则从获取RF列表中移除所选择的RF信道，并重复所述识别，获取和去除的操作，直到 在所选择的RF信道上获取宽系统，或发生系统采集超时。

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：US20070140385A1

公开(公告)日：2007-06-21

申请号：US11303487

申请日：2005-12-15

申请人： Krishna Mukkavilli ,  Michael Wang ,  Raghuraman Krishnamoorthi

发明人： Krishna Mukkavilli ,  Michael Wang ,  Raghuraman Krishnamoorthi

IPC分类号： H04L27/06

CPC分类号： H04L27/2662 ,  H04L25/0202 ,  H04L27/2686

摘要： Apparatus and methods for use in a wireless communication system are disclosed for determining a timing position for channel activity in order to resolve timing ambiguity. A disclosed apparatus includes a processor that determines when channel activity occurs in at least one of an early or a late arrival position in a communication channel estimate and unwraps the channel activity in either the early arrival position or the late arrival position to a corresponding late or early arrival unwrapped channel activity position in the wireless channel estimate. The processor correlates symbol data in the communication signal corresponding to both the channel activity and the unwrapped channel activity to symbol data of the main channel activity. The processor determines whether a correct timing position of the channel activity is one of the early or late arrival positions based on the correlations, thus resolving timing ambiguity. Complementary methods are also disclosed.

摘要翻译： 公开了用于无线通信系统中的装置和方法，用于确定信道活动的定时位置，以便解决定时模糊。 所公开的装置包括处理器，其确定在通信信道估计中的早期或迟到到达位置中的至少一个中何时发生信道活动，并且将早期到达位置或延迟到达位置中的信道活动解包到相应的延迟或 在无线信道估计中提前到达解开的频道活动位置。 处理器将对应于信道活动和解开的信道活动的通信信号中的符号数据与主信道活动的符号数据相关联。 处理器基于相关性确定信道活动的正确定时位置是早期还是迟到位置之一，从而解决定时模糊度。 还公开了互补方法。

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。