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1. 发明授权

US07389463B2 Hierarchical block coding for a packet-based communications system 有权
标题翻译：用于基于分组的通信系统的分层块编码
公开(公告)号：US07389463B2
公开(公告)日：2008-06-17
申请号：US10107025
申请日：2002-03-26
申请人： Kumar Ramaswamy , Louis Robert Litwin, Jr.
发明人： Kumar Ramaswamy , Louis Robert Litwin, Jr.
IPC分类号： H03M13/00
CPC分类号： H04L1/0057 , H03M13/05 , H03M13/1515 , H03M13/2906 , H03M13/373 , H04L1/0041 , H04L1/0045 , H04L1/0065 , H04L1/0083
摘要： A method for hierarchically block coding a packet stream includes the steps of appending a packet error correction code to each packet in the packet stream and appending a block error correction code to successive blocks of packets in the packet stream to form a hierarchically error correction coded packet stream. This packet stream is then transmitted through a communications channel. Errors are corrected in each block of packets in response to each block error correction code and errors are corrected in each packet in each block in response to each packet error correction code.
摘要翻译：一种用于对分组流进行分层编码的方法包括以下步骤：将分组纠错码附加到分组流中的每个分组，并向分组流中的连续的分组块附加块纠错码以形成分层纠错编码分组流。然后通过通信信道传输该分组流。响应于每个块错误校正码，在每个数据块中校正错误，并响应于每个数据包纠错码在每个块中的每个数据包中纠正错误。

2. 发明授权

US07139966B2 Diversity scheme for error control coding in a system with prioritized data 有权
标题翻译：具有优先级数据的系统中的错误控制编码的分集方案
公开(公告)号：US07139966B2
公开(公告)日：2006-11-21
申请号：US10511647
申请日：2003-04-17
申请人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
发明人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
IPC分类号： H03M13/00
CPC分类号： H04L1/08 , H03M13/2909 , H03M13/35 , H04L1/0041 , H04L1/0045 , H04L1/0057 , H04L1/0065 , H04L1/007 , H04L1/0075 , H04L1/0078 , H04L2001/0098
摘要： There is provided a method of diversity error control coding for a system having variable-length packets that carry prioritized data. High priority packets in a data sequence are replicated to form virtual replications. Parity symbols are generated from the data sequence and from the virtual replications, and tag information is generated that indicates a number of the virtual replications used to generate the parity symbols, for subsequent transmission of only the data sequence, the parity symbols, and the tag information to reconstruct the data sequence.
摘要翻译：提供了一种用于具有携带优先级数据的可变长度分组的系统的分集差错控制编码方法。复制数据序列中的高优先级数据包以形成虚拟复制。从数据序列和虚拟复制产生奇偶校验符号，并且生成指示用于生成奇偶校验符号的虚拟复制数的标签信息，用于仅发送数据序列，奇偶校验符号和标签信息重建数据序列。

3. 发明授权

US06577231B2 Clock synchronization over a powerline modem network for multiple devices 有权
公开(公告)号：US06577231B2
公开(公告)日：2003-06-10
申请号：US09825233
申请日：2001-04-03
申请人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
发明人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
IPC分类号： H04M1104
CPC分类号： G04G7/00 , H04B3/542 , H04B2203/5445 , H04B2203/5483 , H04B2203/5495
摘要： An apparatus and method of clock synchronization of a powerline modem network for a plurality of devices are provided. A plurality of devices are provided having a powerline modem and a clock (100). The powerline modem permits communication between the plurality of devices over a powerline network. A synchronization message is provided over the powerline network (102). The synchronization message includes an instruction for each of the plurality of devices to update their clock in accordance with a clock time provided in the synchronization message (104). A synchronization device may be provided to update device clocks on a powerline network.

4. 发明授权

US06980651B2 Method for using an access card to create a secure sub-network on a public network 失效
标题翻译：使用访问卡在公共网络上创建安全子网的方法
公开(公告)号：US06980651B2
公开(公告)日：2005-12-27
申请号：US09884722
申请日：2001-06-19
申请人： Louis Robert Litwin, Jr. , Kumar Ramaswamy , Michael Arthur Derrenberger
发明人： Louis Robert Litwin, Jr. , Kumar Ramaswamy , Michael Arthur Derrenberger
IPC分类号： H04L29/06 , H04L9/00 , H04K1/00
CPC分类号： H04L63/0442 , H04L63/062 , H04L63/0876
摘要： A method for creating a secure sub-network on a public network that includes a set of devices. The secure sub-network is to include a subset of devices from among the set of devices. An access card is provided having a first private key comprised thereon. The access card is scanned to determine the first private key, by the subset of devices. A master device is determined from among the subset of devices. A second private key is selected and a public key is computed based on the second private key, by the master device. The second private key is only known to the master device. The public key is sent to the set of devices, by the master device. A shared encryption key is computed, and an encryption is requested of any subsequent messages between any of the devices comprising the subset of devices using the shared encryption key.
摘要翻译：一种用于在包括一组设备的公共网络上创建安全子网的方法。该安全子网络将包括一组设备中的设备子集。提供具有包括在其上的第一私钥的访问卡。通过设备的子集来扫描访问卡以确定第一私钥。从设备的子集中确定主设备。主设备选择第二私钥并基于第二私钥计算公钥。第二个私钥只有主设备才知道。公钥由主设备发送到设备集。计算共享加密密钥，并且对包括使用共享加密密钥的设备子集的任何设备之间的任何后续消息请求加密。

5. 发明授权

US06834091B2 Time synchronization for data over a powerline modem network 有权
标题翻译：通过电力线调制解调器网络进行数据的时间同步
公开(公告)号：US06834091B2
公开(公告)日：2004-12-21
申请号：US09825232
申请日：2001-04-03
申请人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
发明人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
IPC分类号： H04L700
CPC分类号： H04B3/542 , H04B2203/545 , H04B2203/5495 , H04J3/0638 , H04L7/0008
摘要： Synchronization of a powerline modem network (10) with a plurality of devices is provided. A plurality of devices (16 and 18) each include a powerline modem (20) and a clock circuit (22) for synchronizing a data rate. The powerline modem permits data transmission between the plurality of devices over a powerline network on data carriers (28). A synchronization signal is transmitted over the powerline network. The synchronization signal includes a carrier (30) operating at a frequency different from the data carriers. The synchronization signal provides each of the plurality of devices a time reference to synchronize the data rate.
摘要翻译：提供电力线调制解调器网络（10）与多个设备的同步。多个设备（16和18）各自包括用于同步数据速率的电力线调制解调器（20）和时钟电路（22）。电力线调制解调器允许数据载体（28）上的电力线网络上的多个设备之间的数据传输。通过电力线网络传输同步信号。同步信号包括以与数据载体不同的频率工作的载波（30）。同步信号为多个设备中的每一个提供时间参考以同步数据速率。

6. 发明授权

US06754194B2 Method and apparatus for indicating the presence of a wireless local area network by detecting signature sequences 有权
标题翻译：通过检测签名序列来指示无线局域网的存在的方法和装置
公开(公告)号：US06754194B2
公开(公告)日：2004-06-22
申请号：US10243228
申请日：2002-09-13
申请人： Kumar Ramaswamy , Louis Robert Litwin, Jr. , Paul Gothard Knutson , Wen Gao , Charles Chuanming Wang
发明人： Kumar Ramaswamy , Louis Robert Litwin, Jr. , Paul Gothard Knutson , Wen Gao , Charles Chuanming Wang
IPC分类号： H04Q700
CPC分类号： H04W48/18 , H04W36/0088 , H04W36/14 , H04W52/0229 , H04W52/0245 , H04W52/0254 , Y02D70/142 , Y02D70/164
摘要： A method and apparatus for detecting the presence of a wireless local area network (WLAN) (104) detects at least one signature sequence in a radio frequency (RF) signal associated with a WLAN (104). The present invention indicates the presence of a WLAN (104) in response to the detection of the at least one signature sequence in the RF signal.
摘要翻译：用于检测无线局域网（WLAN）（104）的存在的方法和装置检测与WLAN（104）相关联的射频（RF）信号中的至少一个签名序列。本发明指示响应于RF信号中的至少一个签名序列的检测而存在WLAN（104）。

7. 发明授权

US07162634B2 Method for providing security on a powerline-modem network 有权
标题翻译：在电力线调制解调器网络上提供安全性的方法
公开(公告)号：US07162634B2
公开(公告)日：2007-01-09
申请号：US09837288
申请日：2001-04-18
申请人： Louis Robert Litwin, Jr. , Kumar Ramaswamy , Michael Anthony Pugel
发明人： Louis Robert Litwin, Jr. , Kumar Ramaswamy , Michael Anthony Pugel
IPC分类号： H04L9/00
CPC分类号： H04L9/0841 , H04L9/083
摘要： A method for creating a secure powerline modem network transmits a private key (y) individually to each of the plurality of powerline modem devices (22) to be secured in a network such that each powerline modem device receives the private key in isolation of the network. Each of the plurality of powerline modem devices store the private key. A public key (X) is computed by a master device (32) in the network to be secured. The public key is transmitted from the master device to the plurality of devices. A shared key (Y) is computed at each of the plurality of powerline devices based on the public key and the private key, and communication within the secured network is performed by employing messages encrypted based on the shared key.
摘要翻译：用于创建安全电力线调制解调器网络的方法将个人密钥（y）单独发送到多个电力线调制解调器设备（22）中的每一个以被保护在网络中，使得每个电力线调制解调器设备分离地接收私有密钥。多个电力线调制解调器装置中的每一个存储私钥。公钥（X）由网络中的主设备（32）计算以被保护。公共密钥从主设备发送到多个设备。基于公开密钥和专用密钥，在多个电力线设备中的每一个计算共享密钥（Y），并且通过采用基于共享密钥加密的消息来执行安全网络内的通信。

8. 发明授权

US07073083B2 Method and system for providing emergency shutdown of a malfunctioning device 有权
公开(公告)号：US07073083B2
公开(公告)日：2006-07-04
申请号：US09908230
申请日：2001-07-18
申请人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
发明人： Louis Robert Litwin, Jr. , Kumar Ramaswamy
IPC分类号： G06F1/26
CPC分类号： G06F11/0793 , G06F11/0745 , G06F21/74 , G06F21/85 , G06F2221/2101 , G06F2221/2105 , H04L12/12 , H04L12/40026 , H04L12/40182 , H04L12/417 , H04L41/0659 , H04W24/04
摘要： In a network system having a plurality of devices communicating via a network, a method and system for providing an emergency signal is provided. In one embodiment, a device is malfunctioning if the device continuously transmits data to the network without proper authorization. Another properly functioning device transmits the emergency signal via an auxiliary channel to the malfunctioning device. The auxiliary channel is a separate channel supporting the transmission of the emergency signal. The malfunctioning device receives the emergency signal and disables itself in response to this signal.

9. 发明授权

US06703923B2 Apparatus for providing security on a powerline-modem network 有权
标题翻译：用于在电力线调制解调器网络上提供安全性的装置
公开(公告)号：US06703923B2
公开(公告)日：2004-03-09
申请号：US09837289
申请日：2001-04-18
申请人： Louis Robert Litwin, Jr. , Kumar Ramaswamy , Michael Anthony Pugel
发明人： Louis Robert Litwin, Jr. , Kumar Ramaswamy , Michael Anthony Pugel
IPC分类号： H04M1104
CPC分类号： H04L63/061 , H04B3/54 , H04B2203/5408 , H04B2203/5441 , H04B2203/5445 , H04B2203/5491 , H04L63/062
摘要： A portable security device (10) for setting up secure powerline modem networks is disclosed. The portable security device includes a memory (18) which stores a protocol (19) for communicating with powerline modem devices (e.g., 22), and a socket (14) configured to receive a power cord (23) from a powerline modem device (22). A number assigning device (12 or 16) transmits a private key to powerline modem devices such that the private key is stored in the powerline modem devices and is used to associate a plurality of powerline modem devices and exclude unauthorized powerline modem devices.
摘要翻译：公开了一种用于设置安全电力线调制解调器网络的便携式安全设备（10）。便携式安全设备包括存储器（18），其存储用于与电力线调制解调器设备（例如22）进行通信的协议（19）以及被配置为从电力线调制解调器设备接收电源线（23）的插座（14） 22）。数字分配装置（12或16）将私钥发送到电力线调制解调器装置，使得私钥存储在电力线调制解调装置中，并用于关联多个电力线调制解调装置，并排除未经授权的电力线调制解调装置。

10. 发明授权

US08184523B2 Method and system for compensation of a carrier frequency offset in an OFDM receiver 有权
标题翻译：用于补偿OFDM接收机中的载波频率偏移的方法和系统
公开(公告)号：US08184523B2
公开(公告)日：2012-05-22
申请号：US10481061
申请日：2001-06-22
申请人： Maxim Borisovich Belotserkovsky , Vincent Demoulin , Louis Robert Litwin, Jr.
发明人： Maxim Borisovich Belotserkovsky , Vincent Demoulin , Louis Robert Litwin, Jr.
IPC分类号： H04L5/12 , H04L27/00 , H04J11/00
CPC分类号： H03L7/07 , H03L7/093 , H03L7/0991 , H04L27/261 , H04L27/2657 , H04L27/2662 , H04L27/2675 , H04L2027/0026 , H04L2027/0044 , H04L2027/0067
摘要： An Orthogonal Frequency Division Multiplexing (OFDM) receiver that employs N second-order phase-lock loops sharing a common integrator (where N is the number of pilots in the system). The N second order phase-lock loops track out independent pilot phase rotations to facilitate the constructive averaging of the pilots' phase information. At the same time, by sharing a common integrator, the OFDM receiver takes advantage of noise averaging over multiple pilots to obtain a cleaner frequency offset estimation. The OFDM receiver may also compensate for FFT window drift by calculating a phase difference between a selected pair of pilots and tracking the rate of change of the calculated phase difference over time. The calculated phase difference is used to control the position of an upstream FFT window after a predetermined phase difference threshold is exceeded. The tracked rate of change is used to continuously adjust the phase of downstream equalizer taps.
摘要翻译：正交频分复用（OFDM）接收机，其使用共享公共积分器的N个二阶锁相环（其中N是系统中的导频数）。 N个二阶锁相循环跟踪独立导频相位旋转，以便于导频相位信息的建设性平均。同时，通过共享一个共同的积分器，OFDM接收机利用多个导频上的噪声平均来获得更清晰的频率偏移估计。 OFDM接收机还可以通过计算所选择的导频对之间的相位差并跟踪所计算的相位差随时间的变化率来补偿FFT窗漂移。计算出的相位差用于在超过预定的相位差阈值之后控制上游FFT窗口的位置。跟踪的变化率用于连续调节下游均衡水龙头的相位。

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