公开(公告)号：US20120314818A1

公开(公告)日：2012-12-13

申请号：US13590608

申请日：2012-08-21

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04L27/06

CPC分类号： H04L27/2671 ,  H04L27/0014 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695 ,  H04L2027/003 ,  H04L2027/0067

摘要： A carrier frequency offset can be present in a signal received by a communications receiver, when the receiver has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the signal. A residual carrier frequency offset can remain after most of the carrier frequency offset has been removed from the received signal using conventional techniques. The residual carrier frequency offset is estimated using first and second channel impulse responses derived from first and second portions of the received signal. An estimated phase difference between the first and second channel impulse responses is computed. An estimate of the residual carrier frequency offset is computed using the estimated phase difference.

摘要翻译： 当接收机具有本地频率振荡器时，载波频率偏移可以存在于由通信接收机接收的信号中，本地频率振荡器产生与发射信号的发射机处的本地频率振荡器产生的载波频率不同的载波频率。 在使用常规技术从接收信号中去除了大部分载波频率偏移之后，剩余载波频率偏移量可以保持。 使用从接收信号的第一和第二部分导出的第一和第二信道脉冲响应来估计残余载波频率偏移。 计算第一和第二信道脉冲响应之间的估计相位差。 使用估计的相位差来计算残余载波频率偏移的估计。

公开(公告)号：US20110051862A1

公开(公告)日：2011-03-03

申请号：US12551980

申请日：2009-09-01

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04L27/06

CPC分类号： H04L27/2665 ,  H04L27/2607 ,  H04L27/2663 ,  H04L27/2678 ,  H04L27/2688

摘要： A received signal comprises a continuous sequence of symbols φ1, φ2, . . . φn, each represented by a sequence of samples X0, X2, . . . Xn−1, and wherein the symbols have a guard period GP of duration Tgp at the beginning thereof. Each guard period contains a cyclic prefix with the same subsequence of samples as a tail end portion of the associated symbol. The symbols are identified by delaying the received signal by a fixed number of samples, computing the correlation of the received signal with the delayed signal, computing the summation of said correlation over a window of duration Ti, wherein Ti>Tgp, and sliding the window over the correlation to find a characteristic point or region. The start of each symbol for further processing is selected from the characteristic point or region. By increasing the duration of the window, more robust performance can be achieved, especially in multipath conditions.

摘要翻译： 接收到的信号包括连续的符号序列＆phgr; 1，＆phgr; 2，。 。 。 每个由样本X0，X2，...的序列表示。 。 。 Xn-1，并且其中符号在其开始处具有持续时间Tgp的保护周期GP。 每个保护周期包含循环前缀，其具有与相关联的符号的尾端部分相同的样本子序列。 通过将接收到的信号延迟固定数量的样本来识别符号，计算接收信号与延迟信号的相关性，计算持续时间Ti的窗口上的所述相关性的总和，其中Ti> Tgp，并且滑动窗口 在相关性上找到特征点或区域。 从特征点或区域中选择用于进一步处理的每个符号的开始。 通过增加窗口的持续时间，可以实现更强大的性能，特别是在多径条件下。

公开(公告)号：US20110116562A1

公开(公告)日：2011-05-19

申请号：US12621331

申请日：2009-11-18

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04L27/28 ,  H04L27/00

CPC分类号： H04L27/2671 ,  H04L27/0014 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695 ,  H04L2027/003 ,  H04L2027/0067

摘要： A residual carrier frequency offset of a signal received by a receiver, which has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the received signal is estimated using first and second channel impulse responses derived from first and second portions of the received signal, an estimated phase difference between the first and second channel impulse responses, and an estimate of the residual carrier frequency offset computed using the estimated phase differences. The residual carrier frequency offset is estimated after most of the carrier frequency offset has been removed from the received signal using conventional means.

摘要翻译： 由发送接收信号的发射机产生与本地频率振荡器产生的载波频率不同的载波频率的接收机接收的信号的残余载波频率偏移是使用第一和第二信道 从接收信号的第一和第二部分导出的脉冲响应，第一和第二信道脉冲响应之间的估计相位差以及使用估计的相位差计算出的残余载波频率偏移的估计。 在使用常规方法从接收信号中去除了大部分载波频率偏移之后，估计残余载波频率偏移。

公开(公告)号：US08483330B2

公开(公告)日：2013-07-09

申请号：US12551980

申请日：2009-09-01

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H03D1/00

CPC分类号： H04L27/2665 ,  H04L27/2607 ,  H04L27/2663 ,  H04L27/2678 ,  H04L27/2688

摘要： A received signal comprises a continuous sequence of symbols φ1, φ2, . . . φn, each represented by a sequence of samples X0, X2, . . . Xn−1, and wherein the symbols have a guard period GP of duration Tgp at the beginning thereof. Each guard period contains a cyclic prefix with the same subsequence of samples as a tail end portion of the associated symbol. The symbols are identified by delaying the received signal by a fixed number of samples, computing the correlation of the received signal with the delayed signal, computing the summation of said correlation over a window of duration Ti, wherein Ti>Tgp, and sliding the window over the correlation to find a characteristic point or region. The start of each symbol for further processing is selected from the characteristic point or region. By increasing the duration of the window, more robust performance can be achieved, especially in multipath conditions.

摘要翻译： 接收到的信号包括符号phi1，phi2，...的连续序列。 。 。 每个由样品X0，X2的序列表示。 。 。 Xn-1，并且其中符号在其开始处具有持续时间Tgp的保护周期GP。 每个保护周期包含循环前缀，其具有与相关联的符号的尾端部分相同的样本子序列。 通过将接收到的信号延迟固定数量的样本来识别符号，计算接收信号与延迟信号的相关性，计算持续时间Ti的窗口上的所述相关性的总和，其中Ti> Tgp，并且滑动窗口 在相关性上找到特征点或区域。 从特征点或区域中选择用于进一步处理的每个符号的开始。 通过增加窗口的持续时间，可以实现更强大的性能，特别是在多径条件下。

公开(公告)号：US08913478B2

公开(公告)日：2014-12-16

申请号：US12948534

申请日：2010-11-17

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04J11/00 ,  H04L5/00 ,  H04L1/00 ,  H04B1/38 ,  H04L5/16

CPC分类号： H04L5/0044 ,  H04L1/0043 ,  H04L1/0071

摘要： An interleaver of an OFDM/OFDMA transceiver reshapes a binary vector to be transmitted into a matrix, rotates bits in respective columns of the matrix, divides respective rows of the matrix into an integer number of interleaving blocks, and interleaves the bits in the respective interleaving blocks.

摘要翻译： OFDM / OFDMA收发器的交织器将要发送到矩阵中的二进制向量重新整形，旋转矩阵的各列中的比特，将矩阵的各行划分为整数个交织块，并且交织相应交织中的比特 块。

公开(公告)号：US08498354B2

公开(公告)日：2013-07-30

申请号：US13590608

申请日：2012-08-21

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04K1/10

CPC分类号： H04L27/2671 ,  H04L27/0014 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695 ,  H04L2027/003 ,  H04L2027/0067

摘要： A carrier frequency offset can be present in a signal received by a communications receiver, when the receiver has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the signal. A residual carrier frequency offset can remain after most of the carrier frequency offset has been removed from the received signal using conventional techniques. The residual carrier frequency offset is estimated using first and second channel impulse responses derived from first and second portions of the received signal. An estimated phase difference between the first and second channel impulse responses is computed. An estimate of the residual carrier frequency offset is computed using the estimated phase difference.

摘要翻译： 当接收机具有本地频率振荡器时，载波频率偏移可以存在于由通信接收机接收的信号中，本地频率振荡器产生与发射信号的发射机处的本地频率振荡器产生的载波频率不同的载波频率。 在使用常规技术从接收信号中去除了大部分载波频率偏移之后，剩余载波频率偏移量可以保持。 使用从接收信号的第一和第二部分导出的第一和第二信道脉冲响应来估计残余载波频率偏移。 计算第一和第二信道脉冲响应之间的估计相位差。 使用估计的相位差来计算残余载波频率偏移的估计。

公开(公告)号：US08265184B2

公开(公告)日：2012-09-11

申请号：US12621331

申请日：2009-11-18

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04K1/10

CPC分类号： H04L27/2671 ,  H04L27/0014 ,  H04L27/266 ,  H04L27/2675 ,  H04L27/2695 ,  H04L2027/003 ,  H04L2027/0067

摘要： A carrier frequency offset can be present in a signal received by a communications receiver when the receiver has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the signal. A residual carrier frequency offset can remain after most of the carrier frequency offset has been removed from the received signal using conventional techniques. The residual carrier frequency offset is estimated using first and second channel impulse responses derived from first and second portions of the received signal. An estimated phase difference between the first and second channel impulse responses is computed. An estimate of the residual carrier frequency offset is computed using the estimated phase difference.

摘要翻译： 当接收机具有本地频率振荡器时，载波频率偏移可以存在于由通信接收机接收的信号中，本地频率振荡器产生与发送信号的发射机处的本地频率振荡器产生的载波频率不同的载波频率。 在使用常规技术从接收信号中去除了大部分载波频率偏移之后，剩余载波频率偏移量可以保持。 使用从接收信号的第一和第二部分导出的第一和第二信道脉冲响应来估计残余载波频率偏移。 计算第一和第二信道脉冲响应之间的估计相位差。 使用估计的相位差来计算残余载波频率偏移的估计。

公开(公告)号：US20110116359A1

公开(公告)日：2011-05-19

申请号：US12948534

申请日：2010-11-17

申请人： Lingjie Li ,  Shiquan Wu

发明人： Lingjie Li ,  Shiquan Wu

IPC分类号： H04J11/00 ,  H04L5/16

CPC分类号： H04L5/0044 ,  H04L1/0043 ,  H04L1/0071

摘要： An interleaver of an OFDM/OFDMA transceiver reshapes a binary vector to be transmitted into a matrix, rotates bits in respective columns of the matrix, divides respective rows of the matrix into an integer number of interleaving blocks, and interleaves the bits in the respective interleaving blocks.

摘要翻译： OFDM / OFDMA收发器的交织器将要发送到矩阵中的二进制向量重新整形，旋转矩阵的各列中的比特，将矩阵的各行划分为整数个交织块，并且交织相应交织中的比特 块。

公开(公告)号：US08884819B2

公开(公告)日：2014-11-11

申请号：US13137548

申请日：2011-08-25

申请人： Shiquan Wu

发明人： Shiquan Wu

IPC分类号： H04B7/00 ,  G01S5/04 ,  H04B7/06

CPC分类号： H04B7/0602

摘要： This invention discloses directional antenna systems, antenna combining and transmission antenna selection mechanism for wireless communication terminals such mobile handsets, mobile embedded laptops, mobile CPEs (Customer premises equipment), nomadic wireless CPEs, fixed wireless terminals and etc. The disclosed systems and methods only require analog circuitry and compass readings therefore are easy to implement and well fit into the current wireless terminals architectures. The inventive systems and methods resolve the problem that a directional antenna may not receive properly when user turn around and the antenna direction is deviated from transmitter; the inventive systems and methods further reduce the interference caused by omni antenna systems by selecting a directional antenna for transmit.

摘要翻译： 本发明公开了用于无线通信终端的定向天线系统，天线组合和发射天线选择机制，例如移动手机，移动嵌入式笔记本电脑，移动CPE（客户驻地设备），游牧无线CPE，固定无线终端等。仅公开的系统和方法 因此，需要模拟电路和罗盘读数容易实现，并且很适合当前的无线终端架构。 本发明的系统和方法解决了当用户转向并且天线方向偏离发射机时定向天线可能不能正确接收的问题; 本发明的系统和方法通过选择用于传输的定向天线来进一步减少由全向天线系统引起的干扰。

公开(公告)号：US08792589B2

公开(公告)日：2014-07-29

申请号：US12779782

申请日：2010-05-13

申请人： Shiquan Wu ,  Vajira Samarasooriya

发明人： Shiquan Wu ,  Vajira Samarasooriya

IPC分类号： H04N5/455

CPC分类号： H04N17/004 ,  H03J1/0091 ,  H04B1/76 ,  H04H60/41 ,  H04H60/43 ,  H04N5/50

摘要： A wireless microphone system broadcasts a pilot tone at the designated ATSC pilot position in the TV Band channel being used by the wireless microphone system. The pilot tone is a readily detectable waveform transmitted in the ATSC pilot position. The pilot tone can be generated by any one of: a standalone pilot tone generator; a pilot tone generator incorporated into a wireless microphone receiver; or, a pilot tone generator incorporated into a wireless microphone.

摘要翻译： 无线麦克风系统在由无线麦克风系统使用的TV频道信道中的指定ATSC导频位置广播导频音。 导频音是在ATSC导频位置发送的易于检测的波形。 导频音可以由以下任何一种产生：独立导频音发生器; 并入无线麦克风接收机的导频音发生器; 或者组合到无线麦克风中的导频音发生器。