公开(公告)号：US20110264982A1

公开(公告)日：2011-10-27

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： H03M13/07 ,  G06F11/10 ,  H03M13/29

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：US08934330B2

公开(公告)日：2015-01-13

申请号：US13519577

申请日：2009-12-29

申请人： Ben Niu ,  Gang Liu ,  Li Zou

发明人： Ben Niu ,  Gang Liu ,  Li Zou

IPC分类号： H04J11/00 ,  H04L25/02 ,  H04L27/26

CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0232

摘要： The present invention provides a method for channel estimation used in a receiver of a multi-carrier communication system, including: receiving a multi-carrier symbols from a transmitter of the multi-carrier communication system; and obtaining channel information of sub-carriers carrying data of the multi-carrier symbols, using selectively time direction interpolation and frequency direction interpolation for channel information of a plurality of scatter pilots of the multi-carrier symbols.

摘要翻译： 本发明提供一种用于多载波通信系统的接收机中的信道估计方法，包括：从多载波通信系统的发射机接收多载波符号; 以及使用多载波符号的多个散射导频的信道信息选择性地进行时间内插和频率方向插值来获得承载多载波符号数据的子载波的信道信息。

公开(公告)号：US08385473B2

公开(公告)日：2013-02-26

申请号：US12450215

申请日：2007-03-16

申请人： Peng Liu ,  Li Zou

发明人： Peng Liu ,  Li Zou

IPC分类号： H04L27/00

CPC分类号： H04L27/0012 ,  H04L27/2601

摘要： A receiver supports a single carrier (SC) form of modulation and a multi-carrier form of modulation such as orthogonal frequency division multiplexing (OFDM). Upon receiving a signal, the receiver determines a maximum fluctuation range (MFR) as a function of at least a fourth-order cumulant of a received signal; and classifies a modulation type of the received signal as a function of the determined maximum fluctuation range. After determining the modulation type of the received signal, the receiver switches to that modulation mode to recover data from the received signal.

摘要翻译： 接收机支持单载波（SC）形式的调制和诸如正交频分复用（OFDM）的多载波调制形式。 在接收到信号时，接收机确定作为接收信号的至少四阶累积量的函数的最大波动范围（MFR）; 并且根据确定的最大波动范围对接收信号的调制类型进行分类。 在确定接收信号的调制类型之后，接收机切换到该调制模式以从接收到的信号中恢复数据。

公开(公告)号：US20120287803A1

公开(公告)日：2012-11-15

申请号：US13519577

申请日：2009-12-29

申请人： Ben Niu ,  Gang Liu ,  Li Zou

发明人： Ben Niu ,  Gang Liu ,  Li Zou

IPC分类号： H04L12/26

CPC分类号： H04L27/2647 ,  H04L25/0204 ,  H04L25/022 ,  H04L25/0222 ,  H04L25/0232

摘要： The present invention provides a method for channel estimation used in a receiver of a multi-carrier communication system, including: receiving a multi-carrier symbols from a transmitter of the multi-carrier communication system; and obtaining channel information of sub-carriers carrying data of the multi-carrier symbols, using selectively time direction interpolation and frequency direction interpolation for channel information of a plurality of scatter pilots of the multi-carrier symbols.

摘要翻译： 本发明提供一种用于多载波通信系统的接收机中的信道估计方法，包括：从多载波通信系统的发射机接收多载波符号; 以及使用多载波符号的多个散射导频的信道信息选择性地进行时间内插和频率方向插值来获得承载多载波符号数据的子载波的信道信息。

公开(公告)号：US20100119013A1

公开(公告)日：2010-05-13

申请号：US12452407

申请日：2007-06-29

申请人： Peng Liu ,  Jilin Zou ,  Li Zou

发明人： Peng Liu ,  Jilin Zou ,  Li Zou

IPC分类号： H04L27/22

CPC分类号： H04L27/2647 ,  H04L25/022 ,  H04L25/03159 ,  H04L27/3854

摘要： A receiver is a Digital Video Broadcasting-Terrestrial/Handheld (DVB-T/H) receiver. The DVB-T/H receiver comprises a fast fourier transform (FFT) operative on a signal for providing an FFT output signal comprising a number of samples; a spectrum shifter for reordering the samples in the FFT output signal to provide a spectrum shifted signal; and a phase corrector for estimating a phase error from the FFT output signal and for correcting a phase of the spectrum shifted signal in accordance with the estimated phase error.

摘要翻译： 接收机是数字视频广播地面/手持（DVB-T / H）接收机。 DVB-T / H接收机包括对信号进行操作的快速傅里叶变换（FFT），用于提供包括多个样本的FFT输出信号; 用于对FFT输出信号中的采样进行重新排序以提供频谱移位信号的频谱移位器; 以及相位校正器，用于根据所估计的相位误差估计来自FFT输出信号的相位误差并用于校正频移信号的相位。

公开(公告)号：US20100002788A1

公开(公告)日：2010-01-07

申请号：US12448886

申请日：2007-01-19

申请人： Yiling Wu ,  Li Zou ,  Peng Liu

发明人： Yiling Wu ,  Li Zou ,  Peng Liu

IPC分类号： H04L27/28

CPC分类号： H04L25/0232 ,  H04L5/0007 ,  H04L5/0048 ,  H04L5/006 ,  H04L25/0226 ,  H04L27/2601

摘要： The present invention provides an interpolating method for an OFDM system, a channel estimation method and apparatus, in which each OFDM symbol has scattered pilots inserted, and the interpolating method comprising: the step of inserting at least one copy of the first scattered pilot in each OFDM symbol before the first scattered pilot as virtual pilots, and inserting at least one copy of the last scattered pilot in each OFDM symbol behind the last scattered pilot as virtual pilots, after obtaining the channel state information on the sub-channels which propagate the scattered pilots in the OFDM symbols by linear filtering; and the step of performing interpolation by a FIR filter with the channel state information.

摘要翻译： 本发明提供了一种用于OFDM系统的内插方法，信道估计方法和装置，其中每个OFDM符号具有插入的散射导频，并且所述内插方法包括：将每个所述第一分散导频的至少一个副本插入到每个 在第一散射导频之前的OFDM符号作为虚拟导频，并且在获得在传播散射的子信道上的信道状态信息之后，将最后分散导频后面的每个OFDM符号中的最后分散导频的至少一个拷贝插入虚拟导频 OFDM符号中的导频通过线性滤波; 以及通过具有信道状态信息的FIR滤波器进行插值的步骤。

公开(公告)号：US07065576B2

公开(公告)日：2006-06-20

申请号：US09965691

申请日：2001-09-27

申请人： Ibrahim Mostafa Kamel ,  Li Zou

发明人： Ibrahim Mostafa Kamel ,  Li Zou

IPC分类号： G06F15/16 ,  G06F15/173

CPC分类号： H04W4/08 ,  H04L12/185 ,  H04L12/189 ,  H04W8/08 ,  H04W8/14

摘要： An area is divided into regions or cells each having an associated multicast group address. The cells are organized using a quad-tree data structure that is dynamically updated. Mobile entities within a given cell elect one of their members as coordinator for assessing cost data associated with subdividing or merging the cell with other sibling cells. The coordinators communicate this cost data to a partitioning entity, which may be a central server, that computes a new partition scheme using a greedy algorithm. The new partition scheme is then broadcast to the mobile entities for use in subsequent communication. Mobile entities join multicast groups that intersect with their individual vision domains. In this way, mobile entities can acquire information from other mobile entities without the need to monitor all multicast group transmissions.

公开(公告)号：US20220085614A1

公开(公告)日：2022-03-17

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 ,  H02H7/26

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：US09106498B2

公开(公告)日：2015-08-11

申请号：US12448885

申请日：2007-01-18

申请人： Gang Liu ,  Li Zou

发明人： Gang Liu ,  Li Zou

IPC分类号： H04L7/00 ,  H04L27/26

CPC分类号： H04L27/2662 ,  H04L27/2678 ,  H04L27/2688

摘要： A method for symbol synchronization of received digital signal and a digital signal reception apparatus are provided. The method comprises steps of correlating the received digital signal with the received signal delayed by one symbol so as to obtain a first correlation value result as a combined effort of a strongest path and other paths; removing substantially effect of the strongest path from the first correlation result so as to obtain a second correlation result which exhibits contribution of a fastest path; searching a maximum correlation value and its position of the fastest path so as to determine symbol synchronization timing for initiating FFT processing. The digital signal reception apparatus is characterized by a symbol timing detecting unit for determining symbol synchronization timing of the fastest path through substantially removing the effect of a strongest path.

摘要翻译： 提供了接收数字信号的符号同步的方法和数字信号接收装置。 该方法包括以下步骤：将接收到的数字信号与延迟了一个符号的接收信号进行相关，以获得作为最强路径和其他路径的组合努力的第一相关值结果; 从第一相关结果中去除最强路径的基本影响，以便获得表现出最快路径贡献的第二相关结果; 搜索最大相关值及其最快路径的位置，以便确定用于启动FFT处理的符号同步定时。 数字信号接收装置的特征在于符号定时检测单元，用于通过基本上消除最强路径的影响来确定最快路径的符号同步定时。

公开(公告)号：US08433007B2

公开(公告)日：2013-04-30

申请号：US12456981

申请日：2009-06-25

申请人： Juan Xiang ,  Li Zou

发明人： Juan Xiang ,  Li Zou

IPC分类号： H03D1/00 ,  H04L27/06

CPC分类号： H04L27/2657 ,  H04L27/2605 ,  H04L27/2678 ,  H04L27/3872 ,  H04L2027/0095

摘要： The present invention provides a receiver for receiving digital signals including frames with a binary modulated cyclic preamble, comprising: means for correlating at least part of a first cyclic preamble in a first frame and at least part of a second cyclic preamble in a second frame, and for determining a carrier frequency offset based on said correlation.

摘要翻译： 本发明提供了一种用于接收包括具有二进制调制循环前导码的帧的数字信号的接收机，包括：用于在第一帧中将第一帧中的第一循环前同步码的至少一部分和至少部分第二循环前置码相关的装置， 并且用于基于所述相关来确定载波频率偏移。