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    EXTENDED DURATION PHY HEADER FOR PLC
    31.
    发明申请
    EXTENDED DURATION PHY HEADER FOR PLC 审中-公开
    PLC延长时间PHY头

    公开(公告)号：US20120327987A1

    公开(公告)日：2012-12-27

    申请号：US13529107

    申请日：2012-06-21

    申请人： ANAND G. DABAK ,  TARKESH PANDE ,  IL HAN KIM

    发明人： ANAND G. DABAK ,  TARKESH PANDE ,  IL HAN KIM

    IPC分类号： H04B3/54 ,  H04B1/38

    CPC分类号： H04B3/542 ,  H04B2203/5408

    摘要： A method of powerline communications (PLC) over a PLC channel including a first node and at least a second node utilizes an algorithm that compiles frames having extended duration physical layer (PHY) headers. A duration or estimated duration of a null of the PLC channel is provided. An extended duration PHY header is compiled including a plurality of symbols and bits having a time duration of the PHY header of at least fifty percent (50%) more than the duration or estimated duration of the null. The compiling includes symbol repetition of at least a portion of the plurality of symbols or bit repetition of at least a portion of the plurality of bits. The first node transmits a frame including a preamble and the extended duration PHY header over the PLC channel to at least the second node.

    摘要翻译： 通过包括第一节点和至少第二节点的PLC信道上的电力线通信（PLC）的方法利用编译具有延长的持续时间物理层（PHY）报头的帧的算法。 提供PLC通道的空值的持续时间或估计持续时间。 编译扩展持续时间PHY报头，其包括多个符号和比特，其具有超过空值的持续时间或估计持续时间的至少百分之五十（50％）的PHY报头的持续时间。 编译包括多个符号的至少一部分的符号重复或多个比特的至少一部分的比特重复。 第一节点通过PLC信道将包括前同步码和扩展持续时间PHY报头的帧发送到至少第二节点。

    FLOW CONTROL FOR POWERLINE COMMUNICATIONS
    32.
    发明申请
    FLOW CONTROL FOR POWERLINE COMMUNICATIONS 有权
    POWERLINE通信流量控制

    公开(公告)号：US20120327770A1

    公开(公告)日：2012-12-27

    申请号：US13529146

    申请日：2012-06-21

    申请人： KUMARAN VIJAYASANKAR ,  RAMANUJA VEDANTHAM ,  ANAND G. DABAK ,  TARKESH PANDE ,  IL HAN KIM

    发明人： KUMARAN VIJAYASANKAR ,  RAMANUJA VEDANTHAM ,  ANAND G. DABAK ,  TARKESH PANDE ,  IL HAN KIM

    IPC分类号： H04L12/24 ,  H04L12/26 ,  H04B3/54

    CPC分类号： H04L47/266 ,  H04B3/542 ,  H04B2203/5408 ,  H04L47/12 ,  H04L47/127 ,  H04L47/30 ,  H04L47/32 ,  Y02D50/10

    摘要： A method of powerline communications in a powerline communications (PLC) network including a first node and at least a second node. The first node transmits a data frame to the second node over a PLC channel. The second node has a data buffer for storing received information. The second node runs a flow control algorithm which determines a current congestion condition or a projected congestion condition of the data buffer based on at least one congestion parameter. The current congestion condition and projected congestion condition include nearly congested and fully congested. When the current or projected congestion condition is either nearly congested or fully congested, the second node transmits a BUSY including frame over the PLC channel to at least the first node. The first node defers transmitting of any frames to the second node for a congestion clearing wait time.

    摘要翻译： 一种在包括第一节点和至少第二节点的电力线通信（PLC）网络中的电力线通信的方法。 第一个节点通过PLC通道将数据帧发送到第二个节点。 第二节点具有用于存储接收到的信息的数据缓冲器。 第二节点运行流控制算法，其基于至少一个拥塞参数确定数据缓冲器的当前拥塞状况或预计拥塞状况。 目前的拥挤状况和预计的拥挤情况包括几乎拥挤和充分拥挤。 当当前或预计的拥塞状况几乎拥塞或完全拥塞时，第二节点将包括在PLC信道上的帧的BUSY发送到至少第一节点。 第一个节点将拥塞清除等待时间的任何帧的发送延迟到第二节点。

    PHY PAYLOAD OVER MULTIPLE TONE MASKS USING SINGLE TONE MASK PHY HEADER INFORMATION
    33.
    发明申请
    PHY PAYLOAD OVER MULTIPLE TONE MASKS USING SINGLE TONE MASK PHY HEADER INFORMATION 有权
    PHY PAYLOAD多个音调掩码使用单音调掩码PHY头信息

    公开(公告)号：US20120314744A1

    公开(公告)日：2012-12-13

    申请号：US13493268

    申请日：2012-06-11

    申请人： RAMANUJA VEDANTHAM ,  ANAND G. DABAK ,  TARKESH PANDE ,  IL HAN KIM ,  KUMARAN VIJAYASANKAR

    发明人： RAMANUJA VEDANTHAM ,  ANAND G. DABAK ,  TARKESH PANDE ,  IL HAN KIM ,  KUMARAN VIJAYASANKAR

    IPC分类号： H04B3/54 ,  H04B1/38

    CPC分类号： H04B3/542 ,  H04B2203/5408 ,  H04B2203/5445 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0094 ,  H04L27/2602 ,  H04L27/2613 ,  H04L27/2666 ,  H04L69/22

    摘要： A method of powerline communications (PLC) includes compiling a data frame for physical layer (PHY) by a first communications device at a first communications node on a powerline of a PLC network. The data frame includes a single tone PHY header portion and a data payload portion in a set of tones including at least one tone having a frequency different from a frequency of the single tone. The PHY header portion includes tone mask identification information identifying the set of tones. The first communications device transmits the data frame over the powerline to a second communications device at a second communications node on the powerline. The second communications device receives the data frame, and decodes the data payload using the tone mask identification information in the PHY header portion.

    摘要翻译： 电力线通信（PLC）的方法包括在PLC网络的电力线上的第一通信节点处由第一通信设备编译用于物理层（PHY）的数据帧。 数据帧包括一组音调中的单音PHY头部部分和数据有效载荷部分，包括具有与单音频率不同的频率的至少一个音调。 PHY报头部分包括识别该组音调的色调掩码识别信息。 第一通信设备通过电力线将数据帧发送到电力线上的第二通信节点处的第二通信设备。 第二通信设备接收数据帧，并使用PHY报头部分中的色调掩码识别信息解码数据有效载荷。

    SYSTEM AND METHOD FOR CHANNEL CLASSIFICATION
    34.
    发明申请
    SYSTEM AND METHOD FOR CHANNEL CLASSIFICATION 有权
    用于信道分类的系统和方法

    公开(公告)号：US20120106609A1

    公开(公告)日：2012-05-03

    申请号：US13284745

    申请日：2011-10-28

    申请人： Taejoon KIM ,  Timothy M. SCHMIDL ,  Tarkesh PANDE ,  Anuj BATRA ,  June Chul ROH

    发明人： Taejoon KIM ,  Timothy M. SCHMIDL ,  Tarkesh PANDE ,  Anuj BATRA ,  June Chul ROH

    IPC分类号： H03D1/04 ,  H04B17/00 ,  H04L27/06

    CPC分类号： H04L25/0212 ,  H04L25/0216 ,  H04L25/0222 ,  H04L27/2601

    摘要： A system and method for classifying a channel with regard to delay spread in a wireless network applying orthogonal frequency division multiplexing. In one embodiment, a wireless receiver includes a channel classifier. The channel classifier is configured to compute a channel estimate corresponding to a channel traversed by a packet received by the wireless receiver. The channel classifier is also configured to partition the channel estimate into a plurality of windows. Each window corresponds to a range of time of the channel estimate. The channel classifier is further configured to assign a delay spread classification to the channel based on a distribution of energy across the windows.

    摘要翻译： 一种用于对采用正交频分复用的无线网络中的延迟扩展对信道进行分类的系统和方法。 在一个实施例中，无线接收机包括信道分类器。 信道分类器被配置为计算与由无线接收机接收的分组所经过的信道相对应的信道估计。 信道分类器还被配置为将信道估计分割成多个窗口。 每个窗口对应于信道估计的时间范围。 信道分类器还被配置为基于跨越窗口的能量分布向信道分配延迟扩展分类。

    Building, Transmitting, and Receiving Frame Structures in Power Line Communications
    35.
    发明申请
    Building, Transmitting, and Receiving Frame Structures in Power Line Communications 有权
    电力线通信中的建筑，发射和接收帧结构

    公开(公告)号：US20120093198A1

    公开(公告)日：2012-04-19

    申请号：US13269487

    申请日：2011-10-10

    申请人： Anand G. Dabak ,  Badri N. Varadarajan ,  Il Han Kim ,  Tarkesh Pande

    发明人： Anand G. Dabak ,  Badri N. Varadarajan ,  Il Han Kim ,  Tarkesh Pande

    IPC分类号： H04B1/00 ,  H04L25/00

    CPC分类号： H04L69/22 ,  H04B3/30 ,  H04B3/54 ,  H04B3/542 ,  H04B10/11 ,  H04B2001/6912

    摘要： Systems and methods for building, transmitting, and receiving frame structures in power line communications (PLC) are described. Various techniques described herein provide a preamble design using one or more symbols based on a chirp signal that yields a low peak-to-average power ratio (PAPR). According to some techniques, the preamble may be constructed with one or more different types and/or number of symbols configured to identify a PLC domain operating in close physical proximity to another PLC domain. According to other techniques, one or more preamble symbols may be interspersed within a header portion of a PLC frame to facilitate estimation of a frame boundary and/or sampling frequency offset, for example, in the presence of impulsive noise. According to yet other techniques, a PLC detector may be capable of receiving and decoding two or more types of PLC frames (e.g., using different PLC standards).

    摘要翻译： 描述了在电力线通信（PLC）中构建，发送和接收帧结构的系统和方法。 本文描述的各种技术基于产生低峰值与平均功率比（PAPR）的啁啾信号提供使用一个或多个符号的前导码设计。 根据一些技术，可以使用一个或多个不同类型和/或符号数来构造前导码，该符号被配置为识别在与另一个PLC域紧密物理接近的操作的PLC域。 根据其他技术，一个或多个前导符号可以散布在PLC帧的报头部分内，以便于例如在存在脉冲噪声的情况下估计帧边界和/或采样频率偏移。 根据其他技术，PLC检测器可能能够接收和解码两个或更多类型的PLC帧（例如，使用不同的PLC标准）。

    Systems and methods for efficient channel classification
    37.
    发明授权
    Systems and methods for efficient channel classification 有权
    高效渠道分类的系统和方法

    公开(公告)号：US08023577B2

    公开(公告)日：2011-09-20

    申请号：US12024029

    申请日：2008-01-31

    申请人： Tarkesh Pande ,  Deric W. Waters ,  Srinath Hosur ,  Anuj Batra

    发明人： Tarkesh Pande ,  Deric W. Waters ,  Srinath Hosur ,  Anuj Batra

    IPC分类号： H04B17/00 ,  H04B3/46 ,  H04Q1/20

    CPC分类号： H04L25/0204 ,  H04B7/0417 ,  H04B7/066 ,  H04L2025/03426

    摘要： Embodiments provide a system and method for efficiently classifying different channel types in an orthogonal frequency division multiplexing (OFDM) system. Embodiments quantify the frequency selectivity in a channel by measuring the variation in a particular channel statistic across sub-carriers in an OFDM system, involve minimal complexity in implementation, and can be used in a variety of scenarios. One embodiment is a method for classifying channels in an OFDM system, comprising measuring variation of at least one channel statistic across sub-carriers, quantifying the variation to determine a measurement value, and applying the measurement value to at least one threshold to classify the channel.

    摘要翻译： 实施例提供了一种用于在正交频分复用（OFDM）系统中有效地分类不同信道类型的系统和方法。 实施例通过测量OFDM系统中跨子载波的​​特定信道统计量的变化来量化信道中的频率选择性，涉及实现中的最小复杂度，并且可以用于各种情况。 一个实施例是一种用于对OFDM系统中的信道进行分类的方法，包括测量跨越子载波的至少一个信道统计量的变化，量化变化以确定测量值，以及将测量值应用于至少一个阈值以对信道进行分类 。

    TRANSFORM-BASED SYSTEMS AND METHODS FOR RECONSTRUCTING STEERING MATRICES IN A MIMO-OFDM SYSTEM
    38.
    发明申请
    TRANSFORM-BASED SYSTEMS AND METHODS FOR RECONSTRUCTING STEERING MATRICES IN A MIMO-OFDM SYSTEM 审中-公开
    基于变换的系统和用于重构MIMO-OFDM系统中的转向矩阵的方法

    公开(公告)号：US20080212461A1

    公开(公告)日：2008-09-04

    申请号：US12040750

    申请日：2008-02-29

    申请人： Tarkesh Pande ,  Srinath Hosur ,  Anuj Batra

    发明人： Tarkesh Pande ,  Srinath Hosur ,  Anuj Batra

    IPC分类号： H04J11/00

    CPC分类号： H04B7/0417 ,  H04B7/0626 ,  H04B7/0634 ,  H04B7/0639 ,  H04B7/066 ,  H04L5/0023 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03426 ,  H04L2025/03802

    摘要： Embodiments provide a transform-based method for representing steering matrices in transmit beamforming for a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system. Beamforming embodiments generate a transform-based representation of steering matrices for at least a subset of sub-carriers for which channel information is known. In some embodiments, a beamformer is able to receive transform matrices information for at least a subset of channel sub-carriers, and generate corresponding channel sub-carrier steering matrices. Some embodiments of a beamformee are able to map at least a subset of channel sub-carrier steering matrices to corresponding transform matrices information prior to transmitting the transform matrix information to a beamformer. Other embodiments of a beamformer are able to receive channel information for at least a subset of sub-carriers of a channel, and compute a transform-based representation of a steering matrix for each sub-carrier for which channel information is known.

    摘要翻译： 实施例提供了一种用于表示多输入多输出正交频分复用（MIMO-OFDM）系统的发射波束成形中的导引矩阵的基于变换的方法。 波束形成实施例为已知信道信息的子载波的至少一个子集生成导向矩阵的基于变换的表示。 在一些实施例中，波束形成器能够接收用于信道子载波的至少子集的变换矩阵信息，并且生成相应的信道子载波导引矩阵。 在将变换矩阵信息发送到波束形成器之前，波束形成器的一些实施例能够将信道子载波导引矩阵的至少一个子集映射到对应的变换矩阵信息。 波束形成器的其他实施例能够接收信道的子载波的至少一个子集的信道信息，并且为已知信道信息的每个子载波计算导频矩阵的基于变换的表示。