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51. 发明申请

US20080205571A1 System and Method for Time Aligning Signals in Transmitters 审中-公开
标题翻译：发射机时间对准信号的系统和方法
公开(公告)号：US20080205571A1
公开(公告)日：2008-08-28
申请号：US11967984
申请日：2007-12-31
申请人： Khurram Muhammad , Khurram Waheed
发明人： Khurram Muhammad , Khurram Waheed
IPC分类号： H04L7/00
CPC分类号： H04L27/367 , H04L27/361
摘要： A system and method for time aligning signals in transmitters. A transmitter includes a first signal path coupled to a first data input, a second signal path coupled to a second data input, an error signal energy source coupled to the first and second signal paths, the error signal energy source generates an error signal responsive to a time alignment difference between a first data stream and a second data stream, a time alignment circuit coupled to the error signal energy source, to the first and second data inputs, the time alignment circuit generates a digital control word responsive to the error signal, to the first and second data streams, and a timing adjust unit coupled to the time alignment circuit, to the first and second signal paths, the timing adjust unit inserts a delay proportional to the digital control word in either signal paths.
摘要翻译：用于在发射机中时间对准信号的系统和方法。发射机包括耦合到第一数据输入的第一信号路径，耦合到第二数据输入的第二信号路径，耦合到第一和第二信号路径的误差信号能量源，误差信号能量源产生响应于第一数据流和第二数据流之间的时间对准差，耦合到误差信号能量源的时间对准电路到第一和第二数据输入，时间对准电路响应于误差信号产生数字控制字，第一和第二数据流以及与时间对准电路耦合到第一和第二信号路径的定时调整单元，定时调整单元在任一信号路径中插入与数字控制字成比例的延迟。

52. 发明授权

US07365609B2 Hybrid stochastic gradient based digitally controlled oscillator gain KDCO estimation 有权
标题翻译：基于混合随机梯度的数控振荡器增益KDCO估计
公开(公告)号：US07365609B2
公开(公告)日：2008-04-29
申请号：US11460221
申请日：2006-07-26
申请人： Khurram Waheed , Robert B. Staszewski
发明人： Khurram Waheed , Robert B. Staszewski
IPC分类号： H03C3/06 , H03L7/099 , G06F17/50
CPC分类号： H03B5/04 , H03L2207/50
摘要： A novel hybrid stochastic gradient adaptation apparatus and method for calibrating the gain of an RF or non-RF digitally controlled oscillator (DCO). The adaptation algorithm determines a true stochastic gradient between a forcing function and its corresponding system measure to estimate the system parameters being adapted. A momentum term is generated and injected into the adaptation algorithm in order to stabilize the algorithm by adding inertia against any large transient variations in the input data. In the case of adaptation of DCO gain KDCO, the algorithm determines the stochastic gradient between time varying calibration or actual modulation data and the raw phase error accumulated in an all digital phase locked loop (ADPLL). Two filters preprocess the observable data to limit the bandwidth of the computed stochastic gradient providing a trade-off between sensitivity and settling time.
摘要翻译：一种用于校准RF或非RF数字控制振荡器（DCO）的增益的新型混合随机梯度自适应装置和方法。自适应算法确定强制功能与其对应的系统测量之间的真实随机梯度，以估计适应的系统参数。产生动量项并将其注入到自适应算法中，以通过对输入数据中的任何大的瞬态变化添加惯性来稳定算法。在适应DCO增益K DC DC的情况下，算法确定时变校准或实际调制数据与在所有数字锁相环（ADPLL）中累积的原始相位误差之间的随机梯度。两个滤波器预处理可观测数据，以限制计算出的随机梯度的带宽，从而提供灵敏度和建立时间之间的折衷。

53. 发明申请

US20080042756A1 HYBRID STOCHASTIC GRADIENT BASED DIGITALLY CONTROLLED OSCILLATOR GAIN KDCO ESTIMATION 有权
标题翻译：基于混合梯度的数字控制振荡器增益KDCO估计
公开(公告)号：US20080042756A1
公开(公告)日：2008-02-21
申请号：US11460221
申请日：2006-07-26
申请人： Khurram Waheed , Robert B. Staszewski
发明人： Khurram Waheed , Robert B. Staszewski
IPC分类号： H03L7/00
CPC分类号： H03B5/04 , H03L2207/50
摘要： A novel hybrid stochastic gradient adaptation apparatus and method for calibrating the gain of an RF or non-RF digitally controlled oscillator (DCO). The adaptation algorithm determines a true stochastic gradient between a forcing function and its corresponding system measure to estimate the system parameters being adapted. A momentum term is generated and injected into the adaptation algorithm in order to stabilize the algorithm by adding inertia against any large transient variations in the input data. In the case of adaptation of DCO gain KDCO, the algorithm determines the stochastic gradient between time varying calibration or actual modulation data and the raw phase error accumulated in an all digital phase locked loop (ADPLL). Two filters preprocess the observable data to limit the bandwidth of the computed stochastic gradient providing a trade-off between sensitivity and settling time.
摘要翻译：一种用于校准RF或非RF数字控制振荡器（DCO）的增益的新型混合随机梯度自适应装置和方法。自适应算法确定强制功能与其对应的系统测量之间的真实随机梯度，以估计适应的系统参数。产生动量项并将其注入到自适应算法中，以通过对输入数据中的任何大的瞬态变化添加惯性来稳定算法。在适应DCO增益K DC DC的情况下，算法确定时变校准或实际调制数据与在所有数字锁相环（ADPLL）中累积的原始相位误差之间的随机梯度。两个滤波器预处理可观测数据，以限制计算出的随机梯度的带宽，从而提供灵敏度和建立时间之间的折衷。

54. 发明授权

US09294134B2 Viterbi decoding device and method for decoding a signal produced by a convolutional encoder 有权
标题翻译：维特比解码装置和解码由卷积编码器产生的信号的方法
公开(公告)号：US09294134B2
公开(公告)日：2016-03-22
申请号：US14427029
申请日：2012-09-14
申请人： Mihai-Ionut Stanciu , Ioan-Virgil Dragomir , Khurram Waheed
发明人： Mihai-Ionut Stanciu , Ioan-Virgil Dragomir , Khurram Waheed
IPC分类号： H04L27/06 , H03M13/41 , H04L1/00
CPC分类号： H03M13/41 , H03M13/4107 , H04L1/0054
摘要： A Viterbi decoding device to decode a signal produced by a convolutional encoder is described. The device may include: an analog-to-digital conversion unit to extract a soft symbol S=(S0, S1) from the signal, the soft symbol including a first sample value S0 and a second sample value S1; and a digital processing unit to compute, for each of the N states, a branch metric value of BM—0_K in dependence on the soft symbol S, K being an index identifying the respective state. The digital processing unit may store the soft symbol S as a complex number S=S0+J*S1 in a complex number format; and compute a complex branch metric value BM—0_(K, K′)=BM—0_K+J*BM—0_K′ in a complex number format on the basis of the soft symbol S, with K different from K′.
摘要翻译：描述了对由卷积编码器产生的信号进行解码的维特比解码装置。所述设备可以包括：模数转换单元，用于从所述信号中提取软符号S =（S0，S1），所述软符号包括第一采样值S0和第二采样值S1; 以及数字处理单元，对于N个状态中的每一个，根据软符号S计算BM-0_K的分支度量值，K是识别各自状态的索引。数字处理单元可以以复数格式将软符号S存储为复数S = S0 + J * S1; 并且基于软符号S计算复数分支度量值BM-0_（K，K'）= BM-0_K + J * BM-0_K'，其中K与K'不同。

55. 发明申请

US20140376540A1 Frequency-Domain Symbol And Frame Synchronization In Multi-Carrier Systems 有权
标题翻译：多载波系统中的频域符号和帧同步
公开(公告)号：US20140376540A1
公开(公告)日：2014-12-25
申请号：US13925023
申请日：2013-06-24
申请人： Jianqiang Zeng , Steven M. Bosze , Raja V. Tamma , Kevin B. Traylor , Khurram Waheed
发明人： Jianqiang Zeng , Steven M. Bosze , Raja V. Tamma , Kevin B. Traylor , Khurram Waheed
IPC分类号： H04W56/00
CPC分类号： H04W56/0005
摘要： Methods and systems are disclosed for frequency-domain symbol and frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency components associated with subcarriers within the multi-carrier communication signals. Symbol synchronization is performed in the frequency domain by performing correlation(s) between frequency components of the received signal and frequency-domain synchronization symbol(s). After symbol synchronization, frame synchronization correlation is also performed in the frequency domain between frequency components of the received signal and frequency-domain synchronization symbol(s). The disclosed embodiments are particularly useful for symbol and frame synchronization in multi-carrier received signals for power line communication (PLC) systems and/or other harsh noisy communication environments.
摘要翻译：公开了用于多载波通信系统的频域符号和帧同步的方法和系统。接收的信号被采样并转换成与多载波通信信号内的子载波相关联的频率分量。通过执行接收信号的频率分量与频域同步符号之间的相关性，在频域中执行符号同步。在符号同步之后，也在接收信号的频率分量与频域同步符号之间的频域中执行帧同步相关。所公开的实施例对于用于电力线通信（PLC）系统和/或其他恶劣的噪声通信环境的多载波接收信号中的符号和帧同步特别有用。

56. 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。

57. 发明授权

US08204107B2 Bandwidth reduction mechanism for polar modulation 有权
标题翻译：极化调制带宽减少机制
公开(公告)号：US08204107B2
公开(公告)日：2012-06-19
申请号：US12324308
申请日：2008-11-26
申请人： Jingcheng Zhuang , Robert B. Staszewski , Khurram Waheed
发明人： Jingcheng Zhuang , Robert B. Staszewski , Khurram Waheed
IPC分类号： H04B1/66
CPC分类号： H03C5/00
摘要： A novel and useful apparatus for and method of reducing phase and amplitude modulation bandwidth in polar transmitters. The bandwidth reduction mechanism of the present invention effectively reduces the phase modulation bandwidth of the polar modulation performed in the transmitter by modifying the zero-crossing trajectories in the IQ domain. This significantly reduces the phase modulation bandwidth while still meeting the output spectrum and error vector magnitude (EVM) requirements of the particular modern wideband wireless standard, such as 3G WCDMA, etc. The mechanism detects a zero crossing or a near zero crossing within a predetermined threshold of the origin and an offset vector is generated that when added to the input TX IQ data, shifts the trajectory to avoid the origin thus reducing the resultant polar modulation amplitude and phase bandwidth.
摘要翻译：一种用于降低极化发射机相位和幅度调制带宽的新颖有用的装置和方法。本发明的带宽减小机制通过修改IQ域中的过零轨迹有效地降低了在发射机中执行的极坐标调制的相位调制带宽。这显着降低了相位调制带宽，同时仍然满足特定现代宽带无线标准（如3G WCDMA等）的输出频谱和误差矢量幅度（EVM）要求。机构检测预定的过零点或近零交叉点产生原点的阈值和偏移矢量，当添加到输入TX IQ数据时，移动轨迹以避免原点，从而减少所得到的极坐标调制幅度和相位带宽。

58. 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。

59. 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。

60. 发明授权

US07817747B2 Precise delay alignment between amplitude and phase/frequency modulation paths in a digital polar transmitter 有权
标题翻译：数字极化发射机中幅度和相位/频率调制路径之间的精确延迟对准
公开(公告)号：US07817747B2
公开(公告)日：2010-10-19
申请号：US11675565
申请日：2007-02-15
申请人： Khurram Waheed , Jayawardan Janardhanan , Sameh S. Rezeq , Robert B. Staszewski , Saket Jalan
发明人： Khurram Waheed , Jayawardan Janardhanan , Sameh S. Rezeq , Robert B. Staszewski , Saket Jalan
IPC分类号： H04L27/36
CPC分类号： H04L27/368 , H03C5/00 , H04L7/0029 , H04L7/0041 , H04L7/005 , H04L7/0079 , H04L7/02
摘要： A novel apparatus for and method of delay alignment between amplitude and phase/frequency modulation paths in a digital polar transmitter. The invention provides a fully digital delay alignment mechanism where better than nanosecond alignment is achieved by accounting for processing delays in the digital circuit modules of the transmitter and by the use of programmable delay elements spread across several clock domains. Tapped delay lines compensate for propagation and settling delays in analog elements such as the DCO, dividers, quad switch, buffers, level shifters and digital pre-power amplifier (DPA). A signal correlative mechanism is provided whereby data from the amplitude and phase/frequency modulation paths to be matched is first interpolated and then cross-correlated to achieve accuracy better than the clock domain of comparison. Within the ADPLL portion of the transmitter, precise alignment of reference and direct point injection points in the ADPLL is provded using multiple clock domains, tapped delay lines and clock adjustment circuits.
摘要翻译：数字极性发射机的幅度和相位/频率调制路径之间的延迟对准的新型装置和方法。本发明提供了一种全数字延迟对准机构，其通过考虑发射机的数字电路模块中的处理延迟以及通过使用分布在几个时钟域上的可编程延迟元件来实现比纳秒对准更好的方法。分接延迟线补偿模拟元件（如DCO，分频器，四通道开关，缓冲器，电平移位器和数字预功率放大器（DPA））中的传播和稳定延迟。提供了一种信号相关机制，其中来自要匹配的幅度和相位/频率调制路径的数据首先被内插，然后进行交叉相关，以获得比时钟域更好的比较。在发射机的ADPLL部分内，使用多个时钟域，抽头延迟线和时钟调整电路来证明ADPLL中的参考点和直接点注入点的精确对准。

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