公开(公告)号：US08571142B1

公开(公告)日：2013-10-29

申请号：US13309464

申请日：2011-12-01

申请人： Songping Wu ,  Gang Liu ,  Daxiao Yu ,  Yonghua Song

发明人： Songping Wu ,  Gang Liu ,  Daxiao Yu ,  Yonghua Song

IPC分类号： H04L27/00 ,  H03D3/00 ,  H04W4/00 ,  H04B7/00 ,  H04B1/18 ,  H04B1/28 ,  H04B15/00

CPC分类号： H04B1/16 ,  H04L27/0006 ,  H04W16/14 ,  H04W56/0035 ,  H04W72/06 ,  H04W72/08 ,  H04W72/085

摘要： Systems and methods for using non-crystal-based reference oscillators in the transmission and reception of frequency-modulated signals are disclosed. To protect against intrusion on neighboring designated frequency bands, guard bands, having a collective width greater than the total expected error based on the contribution of the frequency error from the non-crystal-based oscillators in the transmitter and/or receiver, can be designated. To protect against inter-channel interference within a designated frequency band, transmitters and receivers can include static sub-bandwidths wider than any possible total frequency error, such that it would be impossible for a transmitter or receiver to attempt to communicate on an unintended sub-band. The determination of the total possible frequency error can be determined dynamically based on the correlation between a received training sequence and a known pattern before or a communication session to avoid or correct for frequency offset or drift due to the use of non-crystal-based reference oscillators.

摘要翻译： 公开了在频率调制信号的发送和接收中使用基于非晶体的参考振荡器的系统和方法。 为了防止侵入相邻的指定频带，可以指定具有大于总预期误差的总宽度的保护频带，其基于来自发射机和/或接收机中的非晶体振荡器的频率误差的贡献，可以指定 。 为了防止指定频带内的信道间干扰，发射机和接收机可以包括比任何可能的总频率误差更宽的静态子带宽，使得发射机或接收机不可能尝试在非预期子带上进行通信， 带。 可以基于接收到的训练序列与通信会话之前的已知模式之间的相关性来动态地确定总可能的频率误差，以避免或校正由于使用非基于参考的频率偏移或漂移 振荡器。

公开(公告)号：US09184839B1

公开(公告)日：2015-11-10

申请号：US13566157

申请日：2012-08-03

申请人： Songping Wu ,  Daxiao Yu ,  Yonghua Song

发明人： Songping Wu ,  Daxiao Yu ,  Yonghua Song

IPC分类号： H04B10/2507 ,  H04B17/20

CPC分类号： H04B17/17

摘要： The present disclosure describes techniques for identity-based RF circuitry compensation. In some aspects data from a wireless device is received via radio frequency circuitry, the data including an identifier that uniquely identifies the wireless device. Impairments of the radio frequency circuitry are estimated based on the received data and then the estimated impairments are associated with the identifier of the wireless device. In response to subsequently receiving data that includes the identifier, the radio frequency circuitry is compensated using the estimated impairments.

摘要翻译： 本公开描述了用于基于身份的RF电路补偿的技术。 在一些方面，来自无线设备的数据经由射频电路接收，该数据包括唯一地标识无线设备的标识符。 基于接收到的数据来估计射频电路的损害，然后估计的损伤与无线设备的标识符相关联。 响应于随后接收包括标识符的数据，使用估计的损伤来补偿射频电路。

公开(公告)号：US08559569B1

公开(公告)日：2013-10-15

申请号：US13358584

申请日：2012-01-26

申请人： Quan Zhou ,  Songping Wu ,  Daxiao Yu

发明人： Quan Zhou ,  Songping Wu ,  Daxiao Yu

IPC分类号： H03D1/00

CPC分类号： H04L27/06 ,  H04L7/042 ,  H04L27/2613 ,  H04L27/2657 ,  H04L27/2663 ,  H04L27/2671 ,  H04L27/2675

摘要： Systems, methods, and other embodiments associated with preamble detection based on repeated preamble codes are described. According to one embodiment, an apparatus is provided that wirelessly receives a signal and calculates a differential output corresponding to a multiplication of the signal and a delayed version of the signal. A cross correlation is performed between the differential output and a known preamble pattern to produce a cross correlation output. A moving average calculation is performed on the cross correlation output to produce an average cross correlation. One or more peaks are detected in the average cross correlation when the average cross correlation has an amplitude greater than a threshold. When the one or more detected peaks meets predetermined criteria, the apparatus provides information about at least one of the detected peaks for subsequent signal processing.

摘要翻译： 描述了基于重复的前导码的与前导码检测相关联的系统，方法和其他实施例。 根据一个实施例，提供了一种无线地接收信号并且计算与信号的乘法和信号的延迟版本相对应的差分输出的装置。 在差分输出和已知前导码模式之间进行互相关以产生互相关输出。 对互相关输出执行移动平均计算，以产生平均互相关。 当平均互相关幅度大于阈值时，在平均互相关中检测到一个或多个峰值。 当一个或多个检测到的峰值满足预定标准时，该装置提供关于检测到的峰值中的至少一个的信息用于随后的信号处理。

公开(公告)号：US08731029B1

公开(公告)日：2014-05-20

申请号：US13004659

申请日：2011-01-11

申请人： Songping Wu ,  Quan Zhou ,  Daxiao Yu

发明人： Songping Wu ,  Quan Zhou ,  Daxiao Yu

IPC分类号： H04B1/00

CPC分类号： H04B1/707 ,  H04B1/69 ,  H04L27/0014 ,  H04L27/2071 ,  H04L27/2331 ,  H04L27/2655 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662 ,  H04L2027/0026

摘要： Systems and techniques relating to wireless communications are described. A described technique includes receiving information that is indicative of a wireless communication signal transmitted by a wireless communication device, the wireless communication signal having been generated based on a spreading sequence and a known preamble; determining, based on the received information and the known preamble, an estimation of a first frequency offset using two or more locations for encoding elements associated with the spreading sequence; determining, based on the received information, the known preamble, and the first frequency offset, an estimation of a second frequency offset using two or more locations for symbols associated with the known preamble, the second frequency offset being different from the first frequency offset; and processing the received information based on a combination of the first frequency offset and the second frequency offset.

摘要翻译： 描述与无线通信相关的系统和技术。 所描述的技术包括接收指示由无线通信设备发送的无线通信信号的信息，所述无线通信信号已经基于扩展序列和已知前同步码产生; 基于所接收的信息和所述已知前同步骤，使用用于编码与所述扩展序列相关联的元素的两个或多个位置来估计第一频率偏移; 基于所接收的信息，确定所述已知前导码和所述第一频率偏移，使用与所述已知前导码相关联的符号的两个或多个位置的第二频率偏移的估计，所述第二频率偏移不同于所述第一频率偏移; 以及基于所述第一频率偏移和所述第二频率偏移的组合来处理所接收的信息。

公开(公告)号：US08498591B1

公开(公告)日：2013-07-30

申请号：US12860108

申请日：2010-08-20

申请人： Hua Qian ,  Songping Wu ,  Daxiao Yu

发明人： Hua Qian ,  Songping Wu ,  Daxiao Yu

IPC分类号： H04B1/04 ,  H03C1/62

CPC分类号： H04L1/0035 ,  H03F1/3241 ,  H04B1/0475 ,  H04B2001/0425

摘要： Systems and techniques relating to wireless communications are described. A described technique includes generating a digital transmit signal, receiving a digital receive signal, storing signal samples, the signal samples including transmit samples based on the digital transmit signal and receive samples based on the digital receive signal, causing, in a predistortion training mode, the digital receive signal to be based on an amplified analog version of the digital transmit signal, where the amplified analog version is produced by a power amplifier having one or more nonlinear characteristics, determining a synchronization offset value to align the transmit samples with the receive samples, determining one or more power normalization parameter values to normalize a power of the digital receive signal with respect to the digital transmit signal, estimating predistortion parameter values, and using the predistortion parameter values to predistort digital signals to compensate for the one or more nonlinear characteristics of the power amplifier. Estimating predistortion parameter values can include using information comprising the transmit samples, the receive samples, the synchronization offset value, and the one or more power normalization parameter values.

摘要翻译： 描述与无线通信相关的系统和技术。 所描述的技术包括产生数字发送信号，接收数字接收信号，存储信号采样，信号样本包括基于数字发送信号的发送采样，并且基于数字接收信号接收采样，以预失真训练模式， 所述数字接收信号将基于所述数字发射信号的放大的模拟版本，其中所述放大的模拟版本由具有一个或多个非线性特性的功率放大器产生，确定同步偏移值以使所述发射样本与所述接收样本 ，确定一个或多个功率归一化参数值以相对于所述数字发射信号归一化所述数字接收信号的功率，估计预失真参数值，以及使用所述预失真参数值来预失真数字信号以补偿所述一个或多个非线性特性 的功率放大器。 估计预失真参数值可以包括使用包括发送样本，接收样本，同步偏移值和一个或多个功率归一化参数值的信息。

公开(公告)号：US08488698B1

公开(公告)日：2013-07-16

申请号：US13194093

申请日：2011-07-29

申请人： Qing Zhao ,  Jungwon Lee ,  Leilei Song ,  Songping Wu ,  Hui-Ling Lou

发明人： Qing Zhao ,  Jungwon Lee ,  Leilei Song ,  Songping Wu ,  Hui-Ling Lou

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L27/2656 ,  H04L27/2676

摘要： In a method for synchronizing a receiver to a synchronous signal, in a signal having been processed based on an automatic gain control (AGC) with a varying gain, a symbol is detected. An estimated beginning of a subsequent frame is determined based on the detected symbol. A gain of the AGC is fixed for a period during which the estimated start of the subsequent frame is processed by the AGC. A transform of the signal is analyzed to determine if the estimated start of the subsequent frame corresponds to an actual start of the subsequent frame. If the estimated start of the subsequent frame does not corresponds to the actual start of the subsequent frame, the gain of the AGC is allowed to resume varying and, a further symbol in the signal is detected, the signal having been processed based on the varying gain of the AGC.

摘要翻译： 在用于将接收机同步到同步信号的方法中，在基于具有变化增益的自动增益控制（AGC）处理的信号中，检测到符号。 基于检测到的符号确定后续帧的估计开始。 AGC的增益在AGC期间处理后续帧的估计开始的期间是固定的。 分析信号的变换以确定后续帧的估计开始是否对应于后续帧的实际开始。 如果后续帧的估计开始不对应于后续帧的实际开始，则允许AGC的增益恢复变化，并且检测到信号中的另外的符号，该信号已经根据变化 增益AGC。

公开(公告)号：US08477813B2

公开(公告)日：2013-07-02

申请号：US12548205

申请日：2009-08-26

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Manyuan Shen ,  Songping Wu ,  Hui-Ling Lou ,  Yong Liu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Manyuan Shen ,  Songping Wu ,  Hui-Ling Lou ,  Yong Liu

IPC分类号： H04J3/06

CPC分类号： H04W16/28 ,  H04L25/03343 ,  H04L27/2613 ,  H04L2025/03426 ,  H04L2025/03789 ,  H04L2025/03815

摘要： In a wireless communication system wherein communication devices exchange information utilizing data units that conform to a first format, a beamforming training (BFT) data unit that conforms to a second format is transmitted, wherein a length of the BFT data unit is shorter than lengths supported by the first format, wherein the BFT data unit is for transmitting PHY beamforming training information. Information to indicate the BFT data unit conforms to the second format is transmitted to a receiving device. The BFT data unit is generated according to the second format, wherein the BFT data unit includes BFT information elements. The BFT data unit is then transmitted to the receiving device.

摘要翻译： 在其中通信设备利用符合第一格式的数据单元交换信息的无线通信系统中，发送符合第二格式的波束形成训练（BFT）数据单元，其中所述BFT数据单元的长度短于所支持的长度 通过第一格式，其中BFT数据单元用于发送PHY波束形成训练信息。 用于指示符合第二格式的BFT数据单元的信息被发送到接收设备。 BFT数据单元根据第二格式生成，其中BFT数据单元包括BFT信息元素。 然后将BFT数据单元发送到接收设备。

公开(公告)号：US20120272741A1

公开(公告)日：2012-11-01

申请号：US13437770

申请日：2012-04-02

申请人： Hai Xiao ,  Jun Fan ,  Tao Wei ,  Songping Wu

发明人： Hai Xiao ,  Jun Fan ,  Tao Wei ,  Songping Wu

IPC分类号： G01B7/16 ,  B23P21/00

CPC分类号： G01B7/16 ,  G01L1/246 ,  G01L5/04 ,  Y10T29/53022

摘要： A coaxial cable sensor device with periodic impedance discontinuities along the length of its cable. The cable comprises an inner conductor, insulating material disposed around the length of the inner conductor, and an outer conductor disposed around the insulating material. The periodic impedance discontinuities are created by physical deformations or material alterations to at least one of the inner conductor, the outer conductor, and the insulating material. The sensor device may be used to measure temperature, pressure, strain, and acoustic waves in building structures, and is well suited for down-hole or underwater applications.

摘要翻译： 同轴电缆传感器设备，其电缆长度为周期性阻抗不连续。 电缆包括内部导体，围绕内部导体的长度设置的绝缘材料和围绕绝缘材料设置的外部导体。 通过对内部导体，外部导体和绝缘材料中的至少一个的物理变形或材料改变产生周期性阻抗不连续性。 传感器装置可用于测量建筑结构中的温度，压力，应变和声波，并且非常适用于井下或水下应用。

公开(公告)号：US20120207181A1

公开(公告)日：2012-08-16

申请号：US13456941

申请日：2012-04-26

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Huk-Ling Lou

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu ,  Huk-Ling Lou

IPC分类号： H04L29/02

CPC分类号： H04B1/707 ,  H04J13/0014 ,  H04J13/10 ,  H04L27/2613 ,  H04L27/262

摘要： A method for processing a preamble of a data packet, received via a communication channel, using a pair of complementary sequences, wherein a sum of out-of-phase aperiodic autocorrelation coefficients of the pair of complementary sequences is zero, and wherein the preamble includes a first field that provides synchronization information and a second field that provides channel estimation information, includes at least one of (i) correlating a received signal corresponding to the preamble with at least one sequence of the pair of complementary sequences to generate a plurality of respective correlation signals, or (ii) autocorrelating the received signal to generate an autocorrelation signal. The method also includes determining a cover code in the preamble using at least one of (i) the plurality of respective correlation signals, or (ii) the autocorrelation signal. The method also includes using the cover code to decode the preamble.

摘要翻译： 一种用于处理经由通信信道，使用一对互补序列接收的数据分组的前导码的方法，其中所述一对互补序列的异相非周期自相关系数的和为零，并且其中所述前同步码包括 提供同步信息的第一场和提供信道估计信息的第二场包括以下中的至少一个：（i）将与所述前同步码相对应的接收信号与所述一对互补序列中的至少一个序列相关联以产生多个相应的 相关信号，或（ii）自动相关接收的信号以产生自相关信号。 该方法还包括使用（i）多个相关相关信号或（ii）自相关信号中的至少一个来确定前导码中的覆盖码。 该方法还包括使用覆盖码来解码前导码。

公开(公告)号：US08195112B1

公开(公告)日：2012-06-05

申请号：US12481884

申请日：2009-06-10

申请人： Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

发明人： Hongyuan Zhang ,  Arul Durai Murugan Palanivelu ,  Rohit U. Nabar ,  Songping Wu ,  Hui-Ling Lou

IPC分类号： H01Q11/12 ,  H04B1/04

CPC分类号： H04W52/225 ,  H04W52/226

摘要： Time-reversal filtering may be used to temporally focus a signal to be transmitted. Power can be reduced at the transmitter so that the temporally focused signal is within spectral mask requirements. In one embodiment, the effect of the time-reversal filter on the power spectral density for a particular transmitted signal can be calculated and the predicted power spectral density can be compared to the permitted spectral mask to identify violations, if any, of the spectral mask. The transmitter power can then be reduced by the amount of the violation. In another embodiment, a set of different time-reversal filters that meet the spectral mask requirements can be provided in advance, and the most appropriate filter—e.g., the one with the best signal-to-noise ratio for the particular signal—can be chosen from the set of filters.

摘要翻译： 可以使用时间反转滤波来暂时聚焦待传输的信号。 在发射机处可以降低功率，使得时间聚焦的信号在频谱掩模要求之内。 在一个实施例中，可以计算时间反转滤波器对于特定发射信号的功率谱密度的影响，并且可以将预测的功率谱密度与允许的光谱掩模进行比较以识别光谱掩模（如果有的话） 。 然后可以将发射机功率减少违规量。 在另一个实施例中，可以预先提供满足频谱掩模要求的一组不同的时间反转滤波器，并且最合适的滤波器（例如，对于特定信号具有最佳信噪比的滤波器）可以是 从一组过滤器中选择。