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：US08571497B1

公开(公告)日：2013-10-29

申请号：US13297420

申请日：2011-11-16

申请人： Li Lin ,  Arnab Kumar Mitra ,  Daxiao Yu ,  Harish Ramamurthy ,  Sergey Timofeev ,  Lance Nagamine ,  Brian Bosso

发明人： Li Lin ,  Arnab Kumar Mitra ,  Daxiao Yu ,  Harish Ramamurthy ,  Sergey Timofeev ,  Lance Nagamine ,  Brian Bosso

IPC分类号： H01Q11/12 ,  H04B1/04

CPC分类号： H04W52/08 ,  H04B1/04 ,  H04B17/13 ,  H04B2001/0416

摘要： A radio frequency transmitting system includes a programmable amplifier, a power amplifier, a power detector, and a calibration module. The programmable amplifier is configured to amplify an input signal to generate an amplified signal. The power amplifier is configured to output a transmit signal in response to the amplified signal. The transmit signal has a transmit power. The power detector is configured to generate a power measurement in response to the transmit power. The calibration module is configured to implement a plurality of feedback loops to adjust a gain of the programmable amplifier in response to a difference between the power measurement and a desired transmit power. The calibration module is configured to select one of the plurality of feedback loops in response to the desired transmit power.

摘要翻译： 射频发射系统包括可编程放大器，功率放大器，功率检测器和校准模块。 可编程放大器被配置为放大输入信号以产生放大信号。 功率放大器被配置为响应于放大信号输出发射信号。 发射信号具有发射功率。 功率检测器被配置为响应于发射功率而产生功率测量。 校准模块被配置为实现多个反馈回路以响应于功率测量和期望的发射功率之间的差异来调节可编程放大器的增益。 校准模块被配置为响应于期望的发射功率来选择多个反馈回路之一。

公开(公告)号：US06384713B1

公开(公告)日：2002-05-07

申请号：US09556758

申请日：2000-04-21

申请人： Daxiao Yu

发明人： Daxiao Yu

IPC分类号： G05B100

CPC分类号： G06F7/02 ,  G06F2207/025

摘要： In this invention compare circuitry is integrated into a serial shift register which can detect a bit pattern of any length with only the delay of three circuits being added to the shift of the last bit in the bit pattern. The circuitry is connected to operate either is a shift register or as a comparator for an N element bit pattern. Between adjacent registers in the shift register is a MUX used to select compare or shift register operation. An exclusive NOR circuit performs the compare between bits of the serial bit stream and reference bits of the pattern to be protected. An AND circuit accumulates the compare of a particular stage with the compare with the preceding stage. In the last stage the AND circuit provide an accumulated compare result of the preceding number of bit equaling in length the length of the bit pattern for which the compare is being performed.

摘要翻译： 在本发明中，比较电路被集成到串行移位寄存器中，该串行移位寄存器可以检测任何长度的位模式，只有三个电路的延迟被添加到位模式中的最后位的移位。 电路被连接以操作移位寄存器或用作N元件位模式的比较器。 移位寄存器中的相邻寄存器之间是用于选择比较或移位寄存器操作的MUX。 异或逻辑电路执行串行位流的位和要保护的模式的参考位之间的比较。 AND电路将特定级的比较与前级进行比较。 在最后阶段，AND电路提供前一比特数的累加比较结果，长度比较执行比较的比特模式的长度。