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41. 发明授权

US07457231B2 Staggered pilot transmission for channel estimation and time tracking 有权
标题翻译：用于信道估计和时间跟踪的交错导频传输
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。

42. 发明授权

US08259865B2 Methods and apparatus for adapting channel estimation in a communication system 有权
标题翻译：在通信系统中适应信道估计的方法和装置
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。

43. 发明授权

US08165064B2 Enhancements to the positioning pilot channel 失效
标题翻译：增强定位导频信道
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。

44. 发明申请

US20090274099A1 METHODS AND APPARATUS FOR COMMUNICATING TRANSMITTER INFORMATION IN A COMMUNICATION NETWORK 审中-公开
标题翻译：用于在通信网络中传送发送器信息的方法和装置
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。

45. 发明申请

US20090028257A1 METHOD AND APPARATUS FOR INITIAL ACQUISITION OF SIGNALING PARAMETERS FOR A WIRELESS COMMUNICATIONS NETWORK 有权
标题翻译：用于无线通信网络的信号参数初始采集的方法和装置
公开(公告)号：US20090028257A1
公开(公告)日：2009-01-29
申请号：US11834669
申请日：2007-08-06
申请人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Tao Tian
发明人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Tao Tian
IPC分类号： H04K1/10
CPC分类号： H04W48/16 , H04L27/2647
摘要： A method of acquiring a forward link only (FLO) network in a radio frequency (RF) in a wireless communication environment, includes selecting a RF from a first list; selecting a signal parameter (SP) from a second list; determining if a first parameter is found using the selected RF and SP; and, upon determination that the first parameter is found, enabling the use of the selected RF and SP to communicate in the FLO network. An apparatus for implementing the method is also disclosed.
摘要翻译：一种在无线通信环境中在射频（RF）中获取前向链路（FLO）网络的方法，包括从第一列表中选择RF; 从第二列表中选择信号参数（SP）; 使用所选择的RF和SP确定是否发现第一参数; 并且在确定发现第一参数之后，使所选择的RF和SP能够在FLO网络中进行通信。还公开了一种用于实现该方法的装置。

46. 发明授权

US08855655B2 Methods and apparatus for signaling parameter distribution for neighboring radio frequencies 有权
标题翻译：用于信号参数分配的相邻射频的方法和装置
公开(公告)号：US08855655B2
公开(公告)日：2014-10-07
申请号：US12176376
申请日：2008-07-20
申请人： Binita Gupta , Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi
发明人： Binita Gupta , Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi
IPC分类号： H04W40/00 , H04W36/00
CPC分类号： H04W28/18 , H04W48/08
摘要： Methods and apparatus for signaling parameter distribution for neighboring radio frequencies. A method includes identifying selected local operations infrastructures (LOIs) and one or more neighboring LOIs, generating a neighbor description message (NDM) that identifies the selected LOIs and their respective neighbors and specifies SP information for each RF channel associated with the selected LOIs and their respective neighbors, and distributing the NDM over each of the selected LOIs. An apparatus includes a message decoder configured to receive a NDM that identifies RF channels associated with selected LOIs and one or more neighboring LOIs, wherein each RF channel is associated with SP information, and processing logic configured to receive a request to obtain selected SP information associated with a selected RF channel, determine the selected SP information associated with the selected RF channel based on the NDM, and output the selected SP information.
摘要翻译：用于信号参数分配的相邻射频的方法和装置。一种方法包括识别所选择的本地操作基础设施（LOI）和一个或多个相邻LOI，生成标识所选择的LOI及其相应邻居的邻居描述消息（NDM），并且为与所选择的LOI相关联的每个RF信道指定SP信息，并且在每个所选择的LOI上分发NDM。一种装置包括消息解码器，其被配置为接收标识与所选择的LOI和一个或多个相邻LOI相关联的RF信道的NDM，其中每个RF信道与SP信息相关联，以及处理逻辑，被配置为接收获取所选择的SP信息的请求利用所选择的RF信道，基于NDM确定与所选择的RF信道相关联的所选择的SP信息，并输出所选择的SP信息。

47. 发明授权

US08509325B2 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：US08509325B2
公开(公告)日：2013-08-13
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。

48. 发明授权

US08102756B2 Method and apparatus for initial acquisition of signaling parameters for a wireless communications network 有权
标题翻译：用于初始获取无线通信网络的信令参数的方法和装置
公开(公告)号：US08102756B2
公开(公告)日：2012-01-24
申请号：US11834669
申请日：2007-08-06
申请人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Tao Tian
发明人： Krishna Kiran Mukkavilli , Ashok Mantravadi , Raghuraman Krishnamoorthi , Murali Ramaswamy Chari , Tao Tian
IPC分类号： H04J11/00 , H04Q7/00
CPC分类号： H04W48/16 , H04L27/2647
摘要： A method of acquiring a forward link only (FLO) network in a radio frequency (RF) in a wireless communication environment, includes selecting a RF from a first list; selecting a signal parameter (SP) from a second list; determining if a first parameter is found using the selected RF and SP; and, upon determination that the first parameter is found, enabling the use of the selected RF and SP to communicate in the FLO network. An apparatus for implementing the method is also disclosed.
摘要翻译：一种在无线通信环境中在射频（RF）中获取前向链路（FLO）网络的方法，包括从第一列表中选择RF; 从第二列表中选择信号参数（SP）; 使用所选择的RF和SP确定是否发现第一参数; 并且在确定发现第一参数之后，使所选择的RF和SP能够在FLO网络中进行通信。还公开了一种用于实现该方法的装置。

49. 发明授权

US07907593B2 Staggered pilot transmission for channel estimation and time tracking 有权
标题翻译：用于信道估计和时间跟踪的交错导频传输
公开(公告)号：US07907593B2
公开(公告)日：2011-03-15
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： H04J3/06
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。

50. 发明申请

US20090190525A1 ENHANCEMENTS TO THE POSITIONING PILOT CHANNEL 失效
标题翻译：定位飞行员通道的增强
公开(公告)号：US20090190525A1
公开(公告)日：2009-07-30
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： H04W8/00
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。

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