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143 条记录 (耗时 0.037 秒)

    Fast repeated integral images
    1.
    发明授权
    Fast repeated integral images 有权
    快速重复积分图像

    公开(公告)号：US09036937B2

    公开(公告)日：2015-05-19

    申请号：US13230775

    申请日：2011-09-12

    申请人： Ming-Chang Tsai ,  Pawan K. Baheti ,  Murali R. Chari ,  Raghuraman Krishnamoorthi

    发明人： Ming-Chang Tsai ,  Pawan K. Baheti ,  Murali R. Chari ,  Raghuraman Krishnamoorthi

    IPC分类号： G06K9/40 ,  G06T5/20

    CPC分类号： G06T5/20

    摘要： A repeated integral images method filters image data in only two passes, e.g., the first pass filters horizontal rows of pixels and a second pass filters vertical columns of pixels, or in a single pass. The filter performs at least one infinite impulse response (IIR) filter and at least one finite impulse response (FIR) filter on the image data. A plurality of IIR filters and FIR filters maybe performed to approximate a Gaussian filter. By minimizing the number of passes, the data flow between the processing unit and the storage unit is greatly reduced compared to conventional repeated integral images method thereby improving computation time.

    摘要翻译： 重复的积分图像方法仅在两遍中对图像数据进行滤波，例如，第一遍滤波器是水平行像素，第二遍滤波垂直列的像素，或者单次通过。 滤波器对图像数据执行至少一个无限脉冲响应（IIR）滤波器和至少一个有限脉冲响应（FIR）滤波器。 可以执行多个IIR滤波器和FIR滤波器以近似高斯滤波器。 通过最小化通过次数，与传统的重复积分图像方法相比，处理单元和存储单元之间的数据流大大减少，从而改善了计算时间。

    FAST REPEATED INTEGRAL IMAGES
    2.
    发明申请
    FAST REPEATED INTEGRAL IMAGES 有权
    快速重复的整合图像

    公开(公告)号：US20120230600A1

    公开(公告)日：2012-09-13

    申请号：US13230775

    申请日：2011-09-12

    申请人： Ming-Chang Tsai ,  Pawan K. Baheti ,  Murali R. Chari ,  Raghuraman Krishnamoorthi

    发明人： Ming-Chang Tsai ,  Pawan K. Baheti ,  Murali R. Chari ,  Raghuraman Krishnamoorthi

    IPC分类号： G06K9/40

    CPC分类号： G06T5/20

    摘要： A repeated integral images method filters image data in only two passes, e.g., the first pass filters horizontal rows of pixels and a second pass filters vertical columns of pixels, or in a single pass. The filter performs at least one infinite impulse response (IIR) filter and at least one finite impulse response (FIR) filter on the image data. A plurality of IIR filters and FIR filters maybe performed to approximate a Gaussian filter. By minimizing the number of passes, the data flow between the processing unit and the storage unit is greatly reduced compared to conventional repeated integral images method thereby improving computation time.

    摘要翻译： 重复的积分图像方法仅在两遍中对图像数据进行滤波，例如，第一遍滤波器是水平行像素，第二遍滤波垂直列的像素，或者单次通过。 滤波器对图像数据执行至少一个无限脉冲响应（IIR）滤波器和至少一个有限脉冲响应（FIR）滤波器。 可以执行多个IIR滤波器和FIR滤波器以近似高斯滤波器。 通过最小化通过次数，与传统的重复积分图像方法相比，处理单元和存储单元之间的数据流大大减少，从而改善了计算时间。

    Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system
    4.
    发明授权
    Frequency division multiplexing of multiple data streams in a wireless multi-carrier communication system 有权
    无线多载波通信系统中多个数据流的频分复用

    公开(公告)号：US08526412B2

    公开(公告)日：2013-09-03

    申请号：US10968614

    申请日：2004-10-18

    申请人： Rajiv Vijayan ,  Gordon Kent Walker ,  Raghuraman Krishnamoorthi ,  Murali R. Chari

    发明人： Rajiv Vijayan ,  Gordon Kent Walker ,  Raghuraman Krishnamoorthi ,  Murali R. Chari

    IPC分类号： H04B7/288

    CPC分类号： H04L27/0008 ,  H04L5/0007 ,  H04L5/0041 ,  H04L5/0044 ,  H04L5/0051 ,  H04L5/0064 ,  H04L25/022 ,  H04L25/0226 ,  H04L25/0228 ,  H04L27/2604 ,  H04L27/2605 ,  H04L27/2647 ,  Y02D70/10

    摘要： Techniques for multiplexing multiple data streams using frequency division multiplexing (FDM) in an OFDM system are described. M disjoint “interlaces” are formed with U usable subbands. Each interlace is a different set of S subbands, where U=M·S. The subbands for each interlace are interlaced with the subbands for each of the other M−1 interlaces. M slots may be defined for each symbol period and assigned slot indices 1 through M. The slot indices may be mapped to interlaces such that (1) frequency diversity is achieved for each slot index and (2) the interlaces used for pilot transmission have varying distances to the interlaces used for each slot index, which improves channel estimation performance. Each data stream may be processed as data packets of a fixed size, and different numbers of slots may be used for each data packet depending on the coding and modulation scheme used for the data packet.

    摘要翻译： 描述了在OFDM系统中使用频分复用（FDM）来复用多个数据流的技术。 M个不相交的“交错”与U个可用的子带形成。 每个交错是不同的S个子带集合，其中U = M·S。 用于每个交错的子带与用于其它M-1交错的每个子带进行隔行扫描。 可以为每个符号周期和分配的时隙索引1到M定义M个时隙。时隙索引可以被映射到交织，使得（1）针对每个时隙索引实现频率分集，以及（2）用于导频传输的交织具有不同的 到每个时隙索引用于交织的距离，这提高了信道估计性能。 每个数据流可以被处理为固定大小的数据分组，并且根据用于数据分组的编码和调制方案，每个数据分组可以使用不同数量的时隙。

    Channel handoff methods in wireless broadcast systems
    6.
    发明授权
    Channel handoff methods in wireless broadcast systems 有权
    无线广播系统中的信道切换方法

    公开(公告)号：US09554319B2

    公开(公告)日：2017-01-24

    申请号：US11828333

    申请日：2007-07-25

    申请人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    发明人： Linbo Li ,  Ashok Mantravadi ,  Fuyun Ling ,  Raghuraman Krishnamoorthi

    IPC分类号： H04Q7/20 ,  H04W36/28 ,  H04W36/30 ,  H04W72/08

    CPC分类号： H04W36/28 ,  H04W36/30 ,  H04W72/085

    摘要： Systems and methodologies are described that facilitate monitoring RF channels in a wireless communication environment to determine whether one or more channels comprise a forward-link-only (FLO) signal. A receiver can receive a first RF channel with a FLO signal and can monitor other RF channels for FLO signals. Upon a determination that a monitored RF channel comprises a FLO signal, the receiver can switch between the first RF channel and the monitored RF channel, employing information on current MLC decoding status, to facilitate providing seamless reception of the FLO signal, which can be superframe synchronized between RF channels. FLO signal detection can be performed using one or more of a wide-area identification channel energy detection protocol and a wide-area overhead information symbol decoding error detection protocol.

    摘要翻译： 描述了便于在无线通信环境中监视RF信道以确定一个或多个信道是包括仅前向链路（FLO）信号的系统和方法。 接收机可以接收具有FLO信号的第一RF信道，并且可以监视FLO信号的其他RF信道。 在确定被监视的RF信道包括FLO信号之后，接收机可以使用关于当前MLC解码状态的信息在第一RF信道和被监控的RF信道之间切换，以便于提供FLO信号的无缝接收，其可以是超帧 在RF信道之间同步。 可以使用广域识别信道能量检测协议和广域开销信息符号解码错误检测协议中的一个或多个来执行FLO信号检测。

    Methods and apparatus for signaling parameter distribution for neighboring radio frequencies
    8.
    发明授权
    Methods and apparatus for signaling parameter distribution for neighboring radio frequencies 有权
    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。

    Adaptive thresholding for OFDM channel estimation
    10.
    发明授权
    Adaptive thresholding for OFDM channel estimation 有权
    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。