公开(公告)号：US08810059B2

公开(公告)日：2014-08-19

申请号：US13087116

申请日：2011-04-14

Applicant: Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

Inventor： Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

IPC: H04B3/56 ,  H02J3/00

CPC classification number: H04B3/56 ,  H02J3/00 ,  H04B2203/5483

Abstract: Coupling and interface circuits for powerline modems are disclosed. A powerline modem may be coupled to a low voltage (LV) line or a medium voltage (MV) line using a circuit that is designed to compensate for signal attenuation and loss that is created by the a LV/MV transformer and/or a MV coupler. In one embodiment, separate coupling transformers may be used by the modem for reception and transmission. In other embodiments, a capacitance is switched on the transmission line before the modem transmits to lower the line impedance.

Abstract translation: 公开了用于电力线调制解调器的耦合和接口电路。 电力线调制解调器可以使用被设计为补偿由LV / MV变压器和/或MV产生的信号衰减和损耗的电路而耦合到低电压（LV）线路或中压（MV）线路 耦合器 在一个实施例中，分离的耦合变压器可以由调制解调器用于接收和发送。 在其他实施例中，在调制解调器发送之前，在传输线路上切换电容以降低线路阻抗。

公开(公告)号：US08743974B2

公开(公告)日：2014-06-03

申请号：US13597165

申请日：2012-08-28

Applicant: Marcel Nassar ,  Il Han Kim ,  Tarkesh Pande ,  Anand G. Dabak

Inventor： Marcel Nassar ,  Il Han Kim ,  Tarkesh Pande ,  Anand G. Dabak

IPC: H04L25/00 ,  H04B3/00

CPC classification number: H04L1/0003 ,  H04B3/542 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04L1/0009

Abstract: Systems and methods for adaptive modulation and coding with frame size adjustment are described. In various implementations, these systems and methods may be applicable to Power Line Communications (PLC). For example, a method may include identifying a temporal region of a cyclostationary noise over which a frame is to be sent across a PLC network, the cyclostationary noise having a plurality of temporal regions, each of the plurality of temporal regions having a distinct spectral shape. The method may also include applying a given one of a plurality of Modulation and Coding Schemes (MCSs) to the frame to produce a modulated frame, wherein the given one of the plurality of MCSs is selected based, least in part, upon the spectral shape corresponding to the identified temporal region. The method may further include transmitting the modulated frame across the PLC network, at least in part, over the identified temporal region.

Abstract translation: 描述了具有帧大小调整的自适应调制和编码的系统和方法。 在各种实现中，这些系统和方法可以适用于电力线通信（PLC）。 例如，一种方法可以包括识别通过PLC网络发送帧的周期平稳噪声的时间区域，所述周期平稳噪声具有多个时间区域，所述多个时间区域中的每一个具有不同的频谱形状 。 该方法还可以包括将多个调制和编码方案（MCS）中给定的一个应用于帧以产生调制帧，其中至少部分地基于频谱形状选择多个MCS中的给定一个MCS 对应于所识别的时间区域。 该方法可以进一步包括至少部分地通过所识别的时间区域在PLC网络之间传输调制帧。

公开(公告)号：US08718115B2

公开(公告)日：2014-05-06

申请号：US13269487

申请日：2011-10-10

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

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

IPC: H04B1/00 ,  H04J11/00

CPC classification number: H04L69/22 ,  H04B3/30 ,  H04B3/54 ,  H04B3/542 ,  H04B10/11 ,  H04B2001/6912

Abstract: 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).

Abstract translation: 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）。

公开(公告)号：US08625689B2

公开(公告)日：2014-01-07

申请号：US13179202

申请日：2011-07-08

Applicant: Badri Varadarajan ,  Anand Dabak ,  Il Han Kim

Inventor： Badri Varadarajan ,  Anand Dabak ,  Il Han Kim

IPC: H04K1/10

CPC classification number: H04L27/2666 ,  H04B3/46 ,  H04B3/54 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/542 ,  H04B2203/5425 ,  H04L1/0002 ,  H04L1/0019 ,  H04L5/0003 ,  H04L27/2607 ,  H04L27/2671

Abstract: Embodiments of the invention provide time-domain link adaptation in power line communications. In one embodiment, the cyclic prefix length and position is adjusted with an OFDM symbol to overlap a periodic impulse noise pulse, thereby allowing the data carried in the symbol to be detected at a receiver. The cyclic prefix may be adjusted to provide a pattern that yields an integer number of OFDM symbols in one zero crossing period. The data rate used for the symbols overlapping the zero-crossing period may be zero or very low. A high data rate may be used for symbols outside the zero-crossing period because those symbols will not be affected by the periodic impulse noise.

Abstract translation: 本发明的实施例提供了电力线通信中的时域链路自适应。 在一个实施例中，循环前缀长度和位置用OFDM符号调整以与周期性脉冲噪声脉冲重叠，从而允许在接收器处检测符号中携带的数据。 可以调整循环前缀以提供在一个零交叉周期中产生整数个OFDM符号的模式。 用于与过零周期重叠的符号的数据速率可以为零或非常低。 由于这些符号不受周期脉冲噪声的影响，因此高数据速率可用于过零周期以外的符号。

公开(公告)号：US20130051320A1

公开(公告)日：2013-02-28

申请号：US13588204

申请日：2012-08-17

Applicant: Tarkesh Pande ,  Anand G. Dabak ,  Il Han Kim

Inventor： Tarkesh Pande ,  Anand G. Dabak ,  Il Han Kim

IPC: H04J11/00

CPC classification number: H04B3/542 ,  H04B2203/5416 ,  H04B2203/5466 ,  H04B2203/5495

Abstract: Systems and methods for channel estimation using pilot-based symbols are described. In various implementations, these systems and methods may be applicable to Orthogonal Frequency-Division Multiplexing (OFDM)-based communications, for example, as used in Power Line Communications (PLC) or the like. For instance, a method may include receiving a frame over a communication channel at communications device deployed in an OFDM communications network, the frame including a frame control header, a channel estimation portion immediately following the frame control header, and a data payload immediately following the channel estimation portion, where the channel estimation portion includes at least one pilot symbol preceded by at least one of: a guard interval or a cyclic prefix. The method may also include performing a channel estimation operation for the communication channel based, at least in part, upon the channel estimation portion.

Abstract translation: 描述使用基于导频的符号进行信道估计的系统和方法。 在各种实现中，这些系统和方法可以适用于例如在电力线通信（PLC）等中使用的基于正交频分复用（OFDM）的通信。 例如，一种方法可以包括在部署在OFDM通信网络中的通信设备处的通信信道上接收帧，所述通信设备包括帧控制报头，紧跟在帧控制报头之后的信道估计部分以及紧随在帧控制报头之后的数据有效载荷 信道估计部分，其中信道估计部分包括至少一个导频符号，前导是以下之一：保护间隔或循环前缀。 该方法还可以包括至少部分地基于信道估计部分对通信信道执行信道估计操作。

公开(公告)号：US20130051268A1

公开(公告)日：2013-02-28

申请号：US13597010

申请日：2012-08-28

Applicant: Marcel Nassar ,  Il Han Kim ,  Tarkesh Pande ,  Anand G. Dabak ,  Ramanuja Vedantham ,  Kumaran Vijayasankar

Inventor： Marcel Nassar ,  Il Han Kim ,  Tarkesh Pande ,  Anand G. Dabak ,  Ramanuja Vedantham ,  Kumaran Vijayasankar

IPC: H04B3/46

CPC classification number: H04B3/54 ,  H04B2203/5466 ,  H04B2203/5495

Abstract: Systems and methods for Carrier Sense Multiple Access (CSMA) and collision detection using a noise model are described. In various implementations, these systems and methods may be applicable to Power Line Communications (PLC). For example, a method may include receiving a signal via a communications channel in a PLC network, determining a feature of the signal, comparing the feature of the signal with a corresponding feature of a cyclostationary noise model, and taking a predetermined action based, at least in part, upon the comparison. In some implementations, taking the predetermined action may include determining whether to backoff or to transmit a packet over the communications channel. In other implementations, taking the predetermined action may include determining whether an error is due to a packet collision or due to a low quality of the communications channel.

Abstract translation: 描述了载波侦听多路访问（CSMA）的系统和方法以及使用噪声模型的碰撞检测。 在各种实现中，这些系统和方法可以适用于电力线通信（PLC）。 例如，一种方法可以包括通过PLC网络中的通信信道接收信号，确定信号的特征，将信号的特征与循环平稳噪声​​模型的对应特征进行比较，并且基于 至少部分比较。 在一些实现中，采取预定动作可以包括确定是否退避或通过通信信道发送分组。 在其他实现中，采取预定动作可以包括确定错误是由于分组冲突还是由于通信信道质量低而确定。

公开(公告)号：US08265197B2

公开(公告)日：2012-09-11

申请号：US12839315

申请日：2010-07-19

Applicant: Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

Inventor： Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49

CPC classification number: H04B3/542 ,  H04B3/56 ,  H04B2203/5416 ,  H04B2203/542 ,  H04B2203/5466 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0248 ,  H04L25/0276 ,  H04L27/2626 ,  H04L27/2647

Abstract: Systems and methods for power line transmission are disclosed in which transmitters and receivers are connected to one or more phases of the power line. At least one symbol stream to be transmitted on the power line network is generated. The at least one symbol stream is scaled using a weight vector to generate a plurality of scaled symbol streams. The weight vector comprises a plurality of weights, each corresponding to a phase of the power line network. Each of the scaled symbol streams are transmitted on a corresponding phase of the power line network. A zero crossing detector identifies phase information for a receiver. A concentrator adapts signals to be sent to the receiver based upon the phase associated with the receiver.

Abstract translation: 公开了用于电力线传输的系统和方法，其中发射器和接收器连接到电力线的一个或多个相。 生成要在电力线网络上发送的至少一个符号流。 使用权重向量来缩放至少一个符号流以生成多个缩放的符号流。 权重向量包括多个权重，每个权重对应于电力线网络的相位。 每个缩放的符号流在电力线网络的相应相位上传输。 零交叉检测器识别接收机的相位信息。 集中器根据与接收器相关的相位来调整要发送到接收机的信号。

公开(公告)号：US20120099628A1

公开(公告)日：2012-04-26

申请号：US13267300

申请日：2011-10-06

Applicant: Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

Inventor： Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

IPC: H04B3/00 ,  H04B1/38

CPC classification number: H04L1/08 ,  H04B3/54 ,  H04B3/546 ,  H04B2203/5408 ,  H04B2203/5425 ,  H04B2203/5433 ,  H04B2203/5466 ,  H04L1/0059 ,  H04L1/0065

Abstract: Systems and methods for implementing symbol-level repetition coding in power line communications (PLC) are described. In some embodiments, these systems and methods may provide reliable communication in severe channel environments of PLC networks, at least in part, by changing the forward error correction (FEC) used by various devices operating within current PLC systems. For example, a method may include receiving a PLC signal and applying convolutional encoding to the received signal, the convolutional encoding producing an encoded signal. The method may also include performing a subcarrier modulation operation upon the encoded signal, the subcarrier modulation operation producing a modulated signal. The method may further include applying symbol-level repetition coding to the modulated signal, the symbol-level repetition coding producing a repetitious signal. In some cases, one or more distinct repetition patterns may be applied to different symbols or portions thereof. The repetitious signal may then be transmitted over a power line.

Abstract translation: 描述了在电力线通信（PLC）中实现符号级重复编码的系统和方法。 在一些实施例中，这些系统和方法可以至少部分地通过改变在当前PLC系统中操作的各种设备使用的前向纠错（FEC）来在PLC网络的严酷信道环境中提供可靠的通信。 例如，一种方法可以包括接收PLC信号并对接收到的信号应用卷积编码，卷积编码产生编码信号。 该方法还可以包括对编码信号执行子载波调制操作，产生调制信号的子载波调制操作。 该方法还可以包括对调制信号应用符号级重复编码，产生符号级重复编码产生重复信号。 在一些情况下，可以将一个或多个不同的重复图案应用于不同的符号或其部分。 然后可以通过电力线传输重复信号。

公开(公告)号：US20110043340A1

公开(公告)日：2011-02-24

申请号：US12849676

申请日：2010-08-03

Applicant: Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

Inventor： Il Han Kim ,  Badri N. Varadarajan ,  Anand G. Dabak

IPC: G05B11/01

CPC classification number: H04B3/542 ,  H04B2203/5408 ,  H04B2203/5416 ,  H04B2203/5466 ,  H04L1/0041 ,  H04L1/0065 ,  H04L1/0072 ,  H04L1/0075 ,  H04L27/2601

Abstract: A system and method for modulating and coding a signal is disclosed. Data from a Media Access Control (MAC) layer is convolutionally encoded. Robust coding of the data from the MAC layer is performed either before or after the convolutional encoding. The coded data is differentially modulating and then Orthogonal Frequency Division Multiplexed to create an OFDM output signal adapted to be transmitted on a power line network. The robust coding may be a repetition 2 coding or a repetition N coding. The robust coding may add an outer code prior to the convolutional encoding. The robust coding may be Reed Solomon coding performed prior to the convolutional encoding. An optional header for identifying the robust coding is also disclosed along with a method for decoding the header.

Abstract translation: 公开了一种用于调制和编码信号的系统和方法。 媒体访问控制（MAC）层的数据进行卷积编码。 来自MAC层的数据的鲁棒编码在卷积编码之前或之后进行。 编码数据进行差分调制，然后进行正交频分复用，以创建适于在电力线网络上传输的OFDM输出信号。 鲁棒编码可以是重复2编码或重复N编码。 鲁棒编码可以在卷积编码之前添加外部码。 鲁棒编码可以是在卷积编码之前执行的Reed Solomon编码。 还公开了用于识别鲁棒编码的可选报头以及用于对报头进行解码的方法。

公开(公告)号：US20080256163A1

公开(公告)日：2008-10-16

申请号：US12056340

申请日：2008-03-27

Applicant: Bruno CLERCKX ,  Yongxing Zhou ,  Sung Jin Kim ,  David J. Love ,  Il Han Kim

Inventor： Bruno CLERCKX ,  Yongxing Zhou ,  Sung Jin Kim ,  David J. Love ,  Il Han Kim

IPC: G06F17/16 ,  G06F17/30

CPC classification number: H04B7/0639 ,  H04B7/0417

Abstract: An apparatus and method of generating a codebook. The codebook generation apparatus includes a matrix extender to generate a candidate matrix set by multiplying a base matrix and at least one diagonal matrix, wherein the at least one diagonal matrix includes elements of a constrained set as diagonal elements; and a codebook generator to generate the codebook where a minimum distance between the elements is maximized, based on the candidate matrix set. According to aspects of the present invention, it is possible to provide a precoding codebook that can reduce an amount of feedback from a terminal.

Abstract translation: 一种生成码本的装置和方法。 码本生成装置包括：矩阵扩展器，用于通过将基本矩阵和至少一个对角矩阵相乘来生成候选矩阵集，其中所述至少一个对角矩阵包括约束集合的元素作为对角元素; 以及码本生成器，用于基于所述候选矩阵集来生成所述元素之间的最小距离最大化的码本。 根据本发明的各方面，可以提供一种可以减少来自终端的反馈量的预编码码本。