专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

61. 发明授权

US08306174B2 Fractional interpolative timing advance and retard control in a transceiver 有权
标题翻译：收发器中的分数内插定时提前和延迟控制
公开(公告)号：US08306174B2
公开(公告)日：2012-11-06
申请号：US12411482
申请日：2009-03-26
申请人： Thomas Casimir Murphy , Jingcheng Zhuang , Khurram Waheed , Roman Staszewski
发明人： Thomas Casimir Murphy , Jingcheng Zhuang , Khurram Waheed , Roman Staszewski
IPC分类号： H04L7/00
CPC分类号： H04W56/0045
摘要： Transmission of information between user equipment (UE) and base stations in a wireless network occurs using a stream of periodic data. A modem in the UE operates synchronized to a first clock source to produce the stream of periodic data at a chip rate. Transceiver circuitry is synchronized to a variable clock source to receive the stream of data from the first circuitry at a rate according to the variable clock source. A fixed phase relationship is maintained between the variable clock source and the first clock source while the data period is uniform by adjusting the variable clock in response to detected phase errors. Occasionally, one period of the periodic data is changed by a defined amount. The fixed phase relationship is restored over a number of periods in a gradual manner by changing the frequency of the variable clock by an amount. By restoring the phase relationship gradually, quality degradation of the transmitted signal is reduced.
摘要翻译：使用周期性数据流在无线网络中的用户设备（UE）与基站之间传输信息。 UE中的调制解调器与第一时钟源同步，以码片速率产生周期性数据流。收发器电路与可变时钟源同步，以根据可变时钟源的速率从第一电路接收数据流。通过根据检测到的相位误差调整可变时钟，在可变时钟源和第一时钟源之间保持固定的相位关系，同时数据周期是均匀的。有时，周期性数据的一个周期被改变一定的量。通过将可变时钟的频率改变一定量，以逐渐的方式在多个周期内恢复固定相位关系。通过逐渐恢复相位关系，传输信号的质量劣化降低。

62. 发明授权

US08150336B2 Apparatus and method for adaptive polar transmitter linearization and wireless transmitter employing the same 有权
标题翻译：用于自适应极性发射机线性化的装置和方法以及采用该方法的无线发射机
公开(公告)号：US08150336B2
公开(公告)日：2012-04-03
申请号：US12193186
申请日：2008-08-18
申请人： Khurram Waheed , Seydou N. Ba
发明人： Khurram Waheed , Seydou N. Ba
IPC分类号： H04B1/04 , H04K3/00
CPC分类号： H04B1/0475 , H03F1/3241 , H04B2001/0425
摘要： A polar transmitter and a method of linearizing a polar transmitter. In one embodiment, the transmitter includes: (1) a transmit chain having a predistorter configured to employ first amplitude and phase compensation lookup tables to carry out predistortion in the transmit chain, (2) a receiver coupled to the transmit chain and (3) predistortion compensation circuitry associated with the receiver and configured to update second amplitude and phase compensation lookup tables associated therewith based on at least one signal from the transmit chain, the values in the updated second amplitude and phase compensation lookup tables thereby available for subsequent predistortion.
摘要翻译：极性发射机和极化发射机的线性化方法。在一个实施例中，发射机包括：（1）具有预失真器的发射链，其被配置为采用第一幅度和相位补偿查找表来在发射链中执行预失真，（2）耦合到所述发射链的接收机，以及（3）与所述接收机相关联并且被配置为基于来自所述发射链的至少一个信号来更新与其相关联的第二幅度和相位补偿查找表的预失真补偿电路，所述更新的第二幅度和相位补偿查找表中的值由此可用于随后的预失真。

63. 发明授权

US08055217B2 Adaptive complex gain predistorter for a transmitter 有权
标题翻译：用于发射机的自适应复增益预失真器
公开(公告)号：US08055217B2
公开(公告)日：2011-11-08
申请号：US12413109
申请日：2009-03-27
申请人： Seydou Nourou Ba , Khurram Waheed
发明人： Seydou Nourou Ba , Khurram Waheed
IPC分类号： H04B1/04
CPC分类号： H03F1/3247 , H03F3/24 , H03F2201/3233
摘要： Symbols are transmitted in a Cartesian transmitter by pre-distorting an input signal X having in-phase and quadrature components using a first compensation lookup table operable to hold complex valued entries to carry out in-phase and quadrature compensation pre-distortion with respect to the input signal to form a pre-distorted signal Z. The pre-distorted signal Z is processed to form an output signal Y using a nonlinear element. A complex gain normalization parameter adaptively updated to reflect varying gain of a linear region of the nonlinear element. A normalized feed back signal {tilde over (Y)} is formed using the adaptively updated complex gain normalization parameter. The first compensation lookup table is updated based on the pre-distorted input signal Z and the adaptively normalized feedback signal {tilde over (Y)}.
摘要翻译：通过使用第一补偿查找表对具有同相和正交分量的输入信号X进行预失真，在笛卡尔发射机中发送符号，该第一补偿查找表可操作以保持复数值条目，以相对于相位和正交分量执行同相和正交补偿预失真输入信号以形成预失真信号Z.预失真信号Z被处理以使用非线性元件形成输出信号Y. 复增益归一化参数自适应地更新以反映非线性元件的线性区域的变化增益。使用自适应更新的复数增益归一化参数形成归一化的反馈信号{波前（（Y）}）。第一补偿查找表基于预失真的输入信号Z和自适应归一化的反馈信号{波前（Y）}来更新。

64. 发明申请

US20110148676A1 DIGITAL PHASE LOCKED LOOP WITH DITHERING 审中-公开
标题翻译：数字相位锁定环
公开(公告)号：US20110148676A1
公开(公告)日：2011-06-23
申请号：US13038885
申请日：2011-03-02
申请人： Khurram Waheed , Mahbuba Sheba , Robert Bogdan Staszewski , Socrates Vamvakos
发明人： Khurram Waheed , Mahbuba Sheba , Robert Bogdan Staszewski , Socrates Vamvakos
IPC分类号： H03M1/20
CPC分类号： H03M1/0639 , G04F10/005 , H03L7/091 , H03L7/0991 , H03L2207/50 , H03M1/12 , H04L5/0007 , H04L27/0014 , H04L27/2657 , H04L2027/0016 , H04L2027/0051 , H04L2027/0055 , H04L2027/0067 , H04L2027/0069 , H04L2027/0097
摘要： An embodiment of the present invention provides a phase locked loop that operates on clock signals derived from an RF clock signal generated by the phase locked loop. A frequency reference input provides a reference clock. A controllable oscillator generates the RF clock signal. A phase detection circuit operates on the reference clock to provide digital phase error samples indicative of a phase difference between the reference clock and the RF clock. A dithering circuit is coupled to the reference signal and injects a short sequence dither signal into the reference signal in order to overcome quantization noise and thereby improve RMS phase-error detection for integer channels.
摘要翻译：本发明的一个实施例提供了一种锁相环，其对由锁相环产生的RF时钟信号导出的时钟信号进行操作。频率参考输入提供参考时钟。可控振荡器产生RF时钟信号。相位检测电路对参考时钟进行操作，以提供指示参考时钟和RF时钟之间的相位差的数字相位误差样本。抖动电路耦合到参考信号，并将短序列抖动信号注入到参考信号中，以便克服量化噪声，从而改进整数信道的RMS相位误差检测。

65. 发明申请

US20090268791A1 System and Method for Frequency Pushing/Pulling Compensation 有权
标题翻译：频率推动/拉动补偿的系统和方法
公开(公告)号：US20090268791A1
公开(公告)日：2009-10-29
申请号：US12326569
申请日：2008-12-02
申请人： Khurram Waheed , Khurram Muhammad , Jingcheng Zhuang
发明人： Khurram Waheed , Khurram Muhammad , Jingcheng Zhuang
IPC分类号： H04B1/38 , H04B1/04
CPC分类号： H03L7/099 , H03L2207/50
摘要： A system and method for frequency pushing/pulling compensation in phase-locked loops including a method for cancelling frequency push/pull in an oscillator of a transmitter. The method includes computing an error signal from a signal of a phase locked loop, wherein the error signal includes an aggressor signal. Transfer characteristics are computed for the aggressor signal. A transmitted signal is filtered using the transfer characteristics to produce a correction term. The correction term is applied to a frequency control word being provided to the oscillator.
摘要翻译：一种用于在锁相环中频率推/拉补偿的系统和方法，包括用于消除发射机振荡器中的频率推/拉的方法。该方法包括从锁相环的信号计算误差信号，其中误差信号包括侵略者信号。对侵略者信号计算传输特性。使用传输特性对传输的信号进行滤波以产生校正项。校正项被应用于提供给振荡器的频率控制字。

66. 发明申请

US20090051426A1 Large-Dynamic-Range Lookup Table for a Transmitter Predistorter and System and Method Employing the Same 有权
标题翻译：用于发射机预失真器的大型动态范围查找表及其使用的系统和方法
公开(公告)号：US20090051426A1
公开(公告)日：2009-02-26
申请号：US12142890
申请日：2008-06-20
申请人： Seydou N. Ba , Khurram Waheed
发明人： Seydou N. Ba , Khurram Waheed
IPC分类号： H03F1/26
CPC分类号： H03F1/3247 , H03F1/3294 , H03F3/19 , H03F2201/3233
摘要： A predistorters for use with a nonlinear element and methods of predistorting for a nonlinear element for use in a 3G, e.g., WCDMA transmitter. In one embodiment, the predistorter includes: (1) a lookup table having non-uniformly spaced entries therein, (2) a compander configured to compand an input signal based on a nonlinearity of the nonlinear element to address the entries and (3) an interpolation offset calculation circuit associated with the lookup table and configured to produce an output based on a value of the input signal and a linear interpolation involving at least two entries from the lookup table.
摘要翻译：用于非线性元件的预失真器和用于3G（例如WCDMA发射机）中的非线性元件的预失真的方法。在一个实施例中，预失真器包括：（1）在其中具有非均匀间隔的条目的查找表，（2）压缩器，被配置为基于非线性元件的非线性来对输入信号进行补偿以解决条目;（3）内插偏移计算电路，其与查找表相关联并被配置为基于输入信号的值产生输出，以及涉及来自查找表的至少两个条目的线性内插。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式