公开(公告)号：US11621562B2

公开(公告)日：2023-04-04

申请号：US17387857

申请日：2021-07-28

申请人： John Fradley ,  Li Zou ,  Carl Barker

发明人： John Fradley ,  Li Zou ,  Carl Barker

IPC分类号： H02J3/36 ,  H02M7/757 ,  H02M7/483

摘要： In the field of high voltage direct current (HVDC) power transmission networks there is a need for an improved power converter.
A power converter, for use in a HVDC power transmission network, comprises first and second DC terminals, for connection in use to a DC network and between which extends at least one converter limb. The or each converter limb includes first and second limb portions which are separated by an AC terminal, for connection in use to an AC network. Each limb portion includes a switching valve, and the power converter including a controller programmed to control switching of the switching valves to control the flow of a converter current (Imax) through the power converter and thereby in-use transfer power between the power converter and the AC network. The power transferred between the power converter and the AC network has an active component and a reactive component. The controller is further programmed in use to: (i) prioritize to a first extent the transfer of reactive power between the power converter and the AC network during a first operating condition, when the AC voltage (V) of the AC network lies outside a desired operating range, by allowing up to a first amount of the converter current (Imax) to be a reactive current; and (ii) prioritize to a second extent, less than the first extent, the transfer of reactive power between the power converter and the AC network during a second operating condition, when the AC voltage (V) of the AC network lies within the desired operating range, by limiting the amount of converter current (Imax) that can be a reactive current to a second amount, less than the first amount, the second amount being determined according to a measured operating frequency of the AC network.

公开(公告)号：US08699588B2

公开(公告)日：2014-04-15

申请号：US12733455

申请日：2008-09-19

申请人： Peng Liu ,  Li Zou

发明人： Peng Liu ,  Li Zou

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/0232 ,  H04L25/0204 ,  H04L25/0216 ,  H04L27/2647

摘要： A Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) receiver comprises a controller and a frequency interpolator for use in estimating channel state information (CSI) information of a received signal by frequency interpolation. The controller determines a multi-path delay (Tmax) for the received signal and adjusts the bandwidth of the frequency interpolator as a function of the determined multi-path delay. For example, when the multi-path delay is small, the bandwidth of the frequency interpolator is adjusted to be smaller than the bandwidth of the frequency interpolator when the multi-path delay is large. In addition, the controller may also change the coefficients of the frequency interpolator such that different word lengths are used for the coefficients as a function of the determined multi-path delay.

摘要翻译： 数字视频广播 - 地面/手持（DVB-T / H）接收机包括控制器和频率插值器，用于通过频率插值来估计接收信号的信道状态信息（CSI）信息。 控制器确定接收信号的多径延迟（Tmax），并根据确定的多径延迟调整频率插值器的带宽。 例如，当多径延迟小时，当多路径延迟较大时，频率插值器的带宽被调整为小于频率插值器的带宽。 另外，控制器还可以改变频率插值器的系数，使得不同的字长度被用作系数，作为确定的多径延迟的函数。

公开(公告)号：US08566663B2

公开(公告)日：2013-10-22

申请号：US12998418

申请日：2009-10-16

申请人： Wei Zhou ,  Li Zou

发明人： Wei Zhou ,  Li Zou

IPC分类号： H03M13/00

CPC分类号： G06F11/10 ,  H04L1/0072 ,  H04L1/008 ,  H04L1/0083

摘要： A method for protecting signalling information in a frame to be transmitted to a receiver in a communication system, comprising: encoding frame signalling information of the frame to protect the frame signalling information; and encoding Forward Error Correaction FEC block signalling information of FEC blocks in the frame by using Reed-Muller codes to protect the FEC block signaling information.

摘要翻译： 一种用于保护要发送到通信系统中的接收机的帧中的信令信息的方法，包括：对所述帧的帧信令信息进行编码以保护所述帧信令信息; 并通过使用Reed-Muller码来编码帧中FEC块的前向纠错FEC块信令信息，以保护FEC块信令信息。

公开(公告)号：US08566527B2

公开(公告)日：2013-10-22

申请号：US12177341

申请日：2008-07-22

申请人： Timothy James Reidel ,  Li Zou

发明人： Timothy James Reidel ,  Li Zou

IPC分类号： G06F12/06

CPC分类号： G06Q10/06 ,  H04L67/22 ,  H04L69/12

摘要： A system and a method are described, whereby a data cache enables the realization of an efficient design of a usage analyzer for monitoring subscriber access to a communications network. By exploiting the speed advantages of cache memory, as well as adopting innovative data loading and retrieval choices, significant performance improvements in the time required to access the necessary data records can be realized.

摘要翻译： 描述了一种系统和方法，由此数据高速缓存能够实现使用分析器的有效设计，用于监视对通信网络的订户访问。 通过利用高速缓冲存储器的速度优势，以及采用创新的数据加载和检索选择，可以实现访问必要数据记录所需时间的显着性能改进。

公开(公告)号：US08315005B1

公开(公告)日：2012-11-20

申请号：US12614166

申请日：2009-11-06

申请人： Li Zou ,  Duc H. Banh

发明人： Li Zou ,  Duc H. Banh

IPC分类号： G11B21/02

CPC分类号： G11B21/22 ,  G11B5/54 ,  G11B21/12

摘要： A system to detect a ramp position is disclosed. The system includes a head positioner coupled to an actuator arm to position a head relative to a disk and a controller to: control the head positioner to move the head toward the ramp; determine a plurality of integrator values while moving the head; generate a threshold based on the plurality of integrator values; and determine the ramp position based on a first integrator value exceeding the threshold.

摘要翻译： 公开了一种用于检测斜坡位置的系统。 该系统包括联接到致动器臂的头部定位器，以相对于盘定位头部，以及控制器，用于：控制头部定位器以使头朝向斜面移动; 在移动头部的同时确定多个积分器值; 基于所述多个积分器值生成阈值; 并且基于超过阈值的第一积分器值来确定斜坡位置。

公开(公告)号：US07969955B2

公开(公告)日：2011-06-28

申请号：US11494134

申请日：2006-07-27

申请人： Charles Wang ,  Li Zou

发明人： Charles Wang ,  Li Zou

IPC分类号： H04W4/00 ,  H04B7/216

CPC分类号： H04L1/0618

摘要： A system and a method for multimedia multicast transmission in a mobile wireless network are proposed, which can be applied in a multiple-antenna system as well as a single antenna system. The basic message and additional message are transmitted at the same time. Receivers with different capability also with different complexities are used to demodulate different message. In order to design low-complexity receiver, the signal can be demodulated noncoherently for multimedia transmission.

摘要翻译： 提出了一种移动无线网络中多媒体多播传输的系统和方法，可应用于多天线系统以及单天线系统。 基本消息和附加消息同时发送。 用不同复杂度的不同能力的接收机用于解调不同的消息。 为了设计低复杂度的接收机，信号可以非相干地解调用于多媒体传输。

公开(公告)号：US20110090948A1

公开(公告)日：2011-04-21

申请号：US12737094

申请日：2009-05-22

申请人： Wei Zhou ,  Li Zou

发明人： Wei Zhou ,  Li Zou

IPC分类号： H04N11/02 ,  G06F11/00 ,  H03M13/00

CPC分类号： H04L27/3411 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0044 ,  H04L1/005 ,  H04L1/0057 ,  H04L27/0008 ,  H04L27/3416 ,  H04L27/366

摘要： A cable transmitter supports a number of low density parity check (LDPC) coding rates, e.g., 1/4, 1/3, 2/5, 1/2, 3/5, 2/3, 3/4, 4/5, 5/6, 8/9 and 9/10; and supports a number of quadrature amplitude modulation (QAM) schemes, e.g., 4-QAM, 16-QAM, 64-QAM, 256-QAM, 1024-QAM or higher. For a selected modulation scheme, the cable transmitter selects between using a non-uniform symbol constellation or a uniform symbol constellation as a function of a selected coding rate.

摘要翻译： 电缆发射机支持多个低密度奇偶校验（LDPC）编码率，例如1/4，1/3，2 / 5,1 / 2,3 / 5,2 / 3/3/4/4/5 ，5 / 6,8 / 9和9/10; 并且支持多个正交幅度调制（QAM）方案，例如4-QAM，16-QAM，64-QAM，256-QAM，1024-QAM或更高。 对于所选择的调制方案，电缆发射机在使用非均匀符号星座或均匀符号星座之间选择作为所选编码速率的函数。

公开(公告)号：US20100290391A1

公开(公告)日：2010-11-18

申请号：US12735248

申请日：2008-12-15

申请人： Lin Xiang Cheng ,  Zhi Gang Zhang ,  Xian Lei Wang ,  Li Zou

发明人： Lin Xiang Cheng ,  Zhi Gang Zhang ,  Xian Lei Wang ,  Li Zou

IPC分类号： H04W40/00

CPC分类号： H04L61/2038 ,  H04L29/12254 ,  H04L29/12839 ,  H04L61/6022 ,  H04W8/26 ,  H04W48/18 ,  H04W88/06

摘要： The present invention provides an apparatus and method for concurrently accessing multiple wireless networks, comprising: a host for allocating a plurality of virtual MAC addresses based on the number of the wireless networks to be accessed, and a plurality of virtual MAC devices each having one of the virtual MAC addresses allocated by the host, for accessing the multiple wireless networks concurrently; wherein a physical address of the apparatus is set as a transmitter or receiver address of frames for accessing the multiple wireless networks concurrently.

摘要翻译： 本发明提供了一种用于同时访问多个无线网络的装置和方法，包括：主机，用于基于要访问的无线网络的数量分配多个虚拟MAC地址;以及多个虚拟MAC设备，每个虚拟MAC设备各自具有 由主机分配的虚拟MAC地址，用于同时访问多个无线网络; 其中所述设备的物理地址被设置为用于同时访问所述多个无线网络的帧的发送器或接收器地址。

公开(公告)号：US09036694B2

公开(公告)日：2015-05-19

申请号：US12737094

申请日：2009-05-22

申请人： Wei Zhou ,  Li Zou

发明人： Wei Zhou ,  Li Zou

IPC分类号： H04N11/02 ,  G06F11/00 ,  H04L27/34 ,  H04L1/00 ,  H04L27/00 ,  H04L27/36

CPC分类号： H04L27/3411 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0044 ,  H04L1/005 ,  H04L1/0057 ,  H04L27/0008 ,  H04L27/3416 ,  H04L27/366

摘要： A cable transmitter supports a number of low density parity check (LDPC) coding rates, e.g., ¼, ⅓, ⅖, ½, ⅗, ⅔, ¾, ⅘, ⅚, 8/9 and 9/10; and supports a number of quadrature amplitude modulation (QAM) schemes, e.g., 4-QAM, 16-QAM, 64-QAM, 256-QAM, 1024-QAM or higher. For a selected modulation scheme, the cable transmitter selects between using a non-uniform symbol constellation or a uniform symbol constellation as a function of a selected coding rate.

摘要翻译： 电缆发射机支持多个低密度奇偶校验（LDPC）编码率，例如¼，1/3，⅖，½，⅗，⅔，¾，⅘，⅚，8/9和9/10; 并且支持多个正交幅度调制（QAM）方案，例如4-QAM，16-QAM，64-QAM，256-QAM，1024-QAM或更高。 对于所选择的调制方案，电缆发射机在使用非均匀符号星座或均匀符号星座之间选择作为所选编码速率的函数。

公开(公告)号：US09026878B2

公开(公告)日：2015-05-05

申请号：US12734591

申请日：2008-11-11

申请人： Jian Feng Chen ,  Zhi Gang Zhang ,  Yan Feng Zhang ,  Li Zou

发明人： Jian Feng Chen ,  Zhi Gang Zhang ,  Yan Feng Zhang ,  Li Zou

IPC分类号： G06F11/00 ,  H04L1/18 ,  H04L1/00

CPC分类号： H04L1/1867 ,  H04L2001/0097

摘要： A fast retransmission method by introducing the internal node under better channel condition to join the work of retransmission after the destination node sends out the packet loss indication for unicast services. Extended to serve multicast services, a system comprising a plurality of nodes utilizes the farthest node in each branch from the source to transmit an acknowledge signal when packet loss occurs. The system then enables the closest node to the acknowledging node to retransmit the requested packet, thereby improving the target packet hit rate and data integrity with less retransmission steps.

摘要翻译： 一种快速重传方法，在目的节点发出单播服务的丢包指示后，通过在更好的信道条件下引入内部节点加入重传工作。 扩展以服务多播服务，包括多个节点的系统利用来自源的每个分支中的最远节点在发生分组丢失时发送确认信号。 然后，系统使得到确认节点的最靠近的节点重传所请求的分组，从而以更少的重传步骤来提高目标分组命中率和数据完整性。