公开(公告)号：US07813436B1

公开(公告)日：2010-10-12

申请号：US11851115

申请日：2007-09-06

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, a plurality of potential symbols are detected in a signal, the signal having been processed based on automatic gain control (AGC) with a varying gain. Next frame potential symbols corresponding to potential symbols in the plurality of potential symbols are determined, the next frame potential symbols being in frames subsequent to the frames in which the corresponding potential symbols are located. A gain of the AGC is fixed for each corresponding symbol interval during which a next frame potential symbol is operated on by the AGC. In between next frame potential symbols, the AGC is allowed to vary. Next frame potential symbols are analyzed after a transform is calculated to determine if any correspond to a start of a frame.

摘要翻译： 在将接收机同步到同步信号的方法中，在信号中检测多个电位符号，该信号已经基于具有变化增益的自动增益控制（AGC）来处理。 确定与多个电位符号中的电位符号相对应的下一帧电位符号，下一个电位符号位于相应电位符号位于的帧之后的帧中。 对于每个对应的符号间隔，AGC的增益是固定的，在该间隔期间，由AGC操作下一个帧电位符号。 在下一帧电势符号之间，允许AGC变化。 在计算变换之后分析下一​​帧电位符号，以确定是否有对应于帧的开始。

公开(公告)号：US07623052B1

公开(公告)日：2009-11-24

申请号：US11501341

申请日：2006-08-09

申请人： Songping Wu ,  Yui Lin ,  Hui-Ling Lou

发明人： Songping Wu ,  Yui Lin ,  Hui-Ling Lou

IPC分类号： H03M1/62

CPC分类号： H03G3/3078

摘要： A system for detecting interference includes an automatic gain control (AGC) module, a peak detection module, and a control module. The AGC module selectively generates a gain-locked signal when an input signal is received. The peak detector module communicates with the AGC module and selectively generates a peak-detect signal. The control module communicates with the AGC module and the peak detector module and generates a control signal when the control module does not receive the gain-locked signal within a predetermined time after receiving the peak-detect signal.

摘要翻译： 用于检测干扰的系统包括自动增益控制（AGC）模块，峰值检测模块和控制模块。 当接收到输入信号时，AGC模块选择性地产生增益锁定信号。 峰值检测器模块与AGC模块通信，并选择性地产生峰值检测信号。 当控制模块在接收到峰值检测信号之后的预定时间内没有接收到增益锁定信号时，控制模块与AGC模块和峰值检测器模块通信并产生控制信号。

公开(公告)号：US20070135057A1

公开(公告)日：2007-06-14

申请号：US11493473

申请日：2006-07-26

申请人： Bhaskar Nallapureddy ,  Songping Wu ,  Tsunglun Yu ,  Hui-Ling Lou

发明人： Bhaskar Nallapureddy ,  Songping Wu ,  Tsunglun Yu ,  Hui-Ling Lou

IPC分类号： H04B17/00 ,  G01S13/86

CPC分类号： G01S7/021 ,  G01R23/10

摘要： A system includes a sampling module, a counter module, and a frequency characteristic module. The sampling module samples radio frequency (RF) signals on a first channel for a first predetermined period and a second predetermined period that is subsequent to the first predetermined period. The counter module increments first and second counts when the samples collected during the first and second predetermined periods reverse polarity, respectively. The frequency characteristic module determines a frequency of the RF signal based on at least one of the first and the second counts and determines frequency variation of the RF signal based on the first and second counts.

摘要翻译： 系统包括采样模块，计数器模块和频率特征模块。 采样模块在第一通道上采样第一预定周期的射频（RF）信号和在第一预定周期之后的第二预定周期。 当在第一和第二预定时段期间收集的样本分别反向极性时，计数器模块递增第一和第二计数。 频率特性模块基于第一和第二计数中的至少一个来确定RF信号的频率，并且基于第一和第二计数确定RF信号的频率变化。

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：US20090285269A1

公开(公告)日：2009-11-19

申请号：US12419460

申请日：2009-04-07

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu

IPC分类号： H04B1/707

CPC分类号： H04W56/001 ,  H04B1/7073 ,  H04B1/70735 ,  H04B2201/7073 ,  H04J13/0014 ,  H04J13/10 ,  H04L5/0016 ,  H04L27/2613 ,  H04L27/262 ,  H04L27/2656 ,  H04L27/2662 ,  H04W56/00

摘要： A system and method of extracting data from data packets transmitted over a wireless network includes receiving a data packet having a preamble portion and a payload portion. The preamble portion is cross correlated with a first known spreading sequence to generate a first timing signal and the preamble portion is cross correlated with a second known spreading signal to generate a frame timing signal. An impulse is detected in the first timing signal and a first timing parameter is set based upon the detected impulse in the first timing signal. An impulse is detected in the frame timing signal and a frame timing parameter is set based upon the detected impulse in the frame timing signal. Data is extracted from the received payload portion according to the first timing parameter and the frame timing parameter.

摘要翻译： 从通过无线网络发送的数据分组中提取数据的系统和方法包括：接收具有前同步码部分和有效载荷部分的数据分组。 前导码部分与第一已知扩展序列交叉相关，以产生第一定时信号，并且前同步码部分与第二已知扩展信号相互相关，以产生帧定时信号。 在第一定时信号中检测到脉冲，并且基于第一定时信号中检测到的脉冲设置第一定时参数。 在帧定时信号中检测到脉冲，并且基于帧定时信号中检测到的脉冲设置帧定时参数。 根据第一定时参数和帧定时参数从接收到的有效载荷部分提取数据。

公开(公告)号：US20100103045A1

公开(公告)日：2010-04-29

申请号：US12605978

申请日：2009-10-26

申请人： Yong Liu ,  Hongyuan Zhang ,  Songping Wu

发明人： Yong Liu ,  Hongyuan Zhang ,  Songping Wu

IPC分类号： H01Q3/00

CPC分类号： H04B7/04 ,  H04B7/0617 ,  H04B7/0632 ,  H04L43/0847 ,  H04W16/28 ,  H04W84/02

摘要： A plurality of beacon data units are generated, and each beacon data unit in the plurality of beacon data units includes an indication that the beacon data unit can be used for transmit beamforming training. The plurality of beacon data units are transmitted via a plurality of antennas during a timeslot reserved for the transmission of beacons. A different beamforming vector is applied to a beamforming network as each beacon data unit is transmitted. In another aspect, a first beamforming training transmission corrupted by a collision is received. A first station to which the first beamforming training transmission corresponds is determined based on the first beamforming training transmission corrupted by the collision. In response to determining the first station, a signal is transmitted to the first station to prompt the first station to transmit a second beamforming training transmission.

摘要翻译： 生成多个信标数据单元，并且多个信标数据单元中的每个信标数据单元包括信标数据单元可用于发送波束形成训练的指示。 在为发送信标而保留的时隙期间，经由多个天线发送多个信标数据单元。 当发送每个信标数据单元时，将不同的波束形成向量应用于波束形成网络。 在另一方面，接收到被冲突破坏的第一波束形成训练传输。 基于由碰撞破坏的第一波束形成训练传输来确定第一波束形成训练传输对应的第一站。 响应于确定第一站，将信号发送到第一站，以提示第一站发送第二波束形成训练传输。

公开(公告)号：US08630588B2

公开(公告)日：2014-01-14

申请号：US12605978

申请日：2009-10-26

申请人： Yong Liu ,  Hongyuan Zhang ,  Songping Wu

发明人： Yong Liu ,  Hongyuan Zhang ,  Songping Wu

IPC分类号： H04B1/00

CPC分类号： H04B7/04 ,  H04B7/0617 ,  H04B7/0632 ,  H04L43/0847 ,  H04W16/28 ,  H04W84/02

摘要： A plurality of beacon data units are generated, and each beacon data unit in the plurality of beacon data units includes an indication that the beacon data unit can be used for transmit beamforming training. The plurality of beacon data units are transmitted via a plurality of antennas during a timeslot reserved for the transmission of beacons. A different beamforming vector is applied to a beamforming network as each beacon data unit is transmitted. In another aspect, a first beamforming training transmission corrupted by a collision is received. A first station to which the first beamforming training transmission corresponds is determined based on the first beamforming training transmission corrupted by the collision. In response to determining the first station, a signal is transmitted to the first station to prompt the first station to transmit a second beamforming training transmission.

摘要翻译： 生成多个信标数据单元，并且多个信标数据单元中的每个信标数据单元包括信标数据单元可用于发送波束形成训练的指示。 在为发送信标而保留的时隙期间，经由多个天线发送多个信标数据单元。 当发送每个信标数据单元时，将不同的波束形成向量应用于波束形成网络。 在另一方面，接收到被冲突破坏的第一波束形成训练传输。 基于由碰撞破坏的第一波束形成训练传输来确定第一波束形成训练传输对应的第一站。 响应于确定第一站，将信号发送到第一站，以提示第一站发送第二波束形成训练传输。

公开(公告)号：US08385390B2

公开(公告)日：2013-02-26

申请号：US12419460

申请日：2009-04-07

申请人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu

发明人： Hongyuan Zhang ,  Rohit U. Nabar ,  Songping Wu

IPC分类号： H04B1/00

CPC分类号： H04W56/001 ,  H04B1/7073 ,  H04B1/70735 ,  H04B2201/7073 ,  H04J13/0014 ,  H04J13/10 ,  H04L5/0016 ,  H04L27/2613 ,  H04L27/262 ,  H04L27/2656 ,  H04L27/2662 ,  H04W56/00

摘要： A system and method of extracting data from data packets transmitted over a wireless network includes receiving a data packet having a preamble portion and a payload portion. The preamble portion is cross correlated with a first known spreading sequence to generate a first timing signal and the preamble portion is cross correlated with a second known spreading signal to generate a frame timing signal. An impulse is detected in the first timing signal and a first timing parameter is set based upon the detected impulse in the first timing signal. An impulse is detected in the frame timing signal and a frame timing parameter is set based upon the detected impulse in the frame timing signal. Data is extracted from the received payload portion according to the first timing parameter and the frame timing parameter.

摘要翻译： 从通过无线网络发送的数据分组中提取数据的系统和方法包括：接收具有前同步码部分和有效载荷部分的数据分组。 前导码部分与第一已知扩展序列交叉相关，以产生第一定时信号，并且前同步码部分与第二已知扩展信号相互相关，以产生帧定时信号。 在第一定时信号中检测到脉冲，并且基于第一定时信号中检测到的脉冲设置第一定时参数。 在帧定时信号中检测到脉冲，并且基于帧定时信号中检测到的脉冲设置帧定时参数。 根据第一定时参数和帧定时参数从接收到的有效载荷部分提取数据。

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：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。