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    Predistortion technique for high power amplifiers
    1.
    发明授权
    Predistortion technique for high power amplifiers 失效
    大功率放大器的预失真技术

    公开(公告)号：US06600792B2

    公开(公告)日：2003-07-29

    申请号：US09105532

    申请日：1998-06-26

    申请人： Franklin P. Antonio ,  Walid Hamdy ,  Nitin Kasturi ,  Christopher C. Riddle ,  David P. Oses

    发明人： Franklin P. Antonio ,  Walid Hamdy ,  Nitin Kasturi ,  Christopher C. Riddle ,  David P. Oses

    IPC分类号： H04L2549

    CPC分类号： H03F1/3247 ,  H03F1/3241 ,  H03F2201/3233

    摘要： A predistortion technique for high power amplifiers includes an adaptive predistortion algorithm that operates independently of data samples to write a set of complex gain values, or predistortion parameters, to a lookup table. The algorithm may be processor-driven. The gain values are taken from the lookup table and multiplied by a complex digital baseband waveform. The gain values may first be subjected to interpolation. The downconverted output of the amplifier is measured to gauge the efficacy of the predistortion. Based on the effect of the predistortion upon the ratio of in-band power to out-of-band power, decisions are made on the set of predistortion parameters for the next iteration of the algorithm. The algorithm runs continuously, perturbing parameters and adapting the predistortion functions accordingly in an effort to continually reflect instantaneous amplitude-modulation and phase-modulation relationships that may change over time with temperature variation or component aging.

    摘要翻译： 用于高功率放大器的预失真技术包括自适应预失真算法，其独立于数据样本操作以将一组复增益值或预失真参数写入查找表。 算法可能是处理器驱动的。 增益值取自查表，并乘以复数数字基带波形。 增益值可以首先进行插值。 测量放大器的下变频输出以测量预失真的功效。 基于预失真对带内功率与带外功率之比的影响，决定了该算法下一次迭代的预失真参数集。 该算法连续运行，扰动参数并相应地调整预失真函数，以努力连续反映随着温度变化或分量老化而随时间变化的瞬时幅度调制和相位调制关系。

    Power control for multiple transport channels in a wireless communication system
    2.
    发明授权
    Power control for multiple transport channels in a wireless communication system 有权
    无线通信系统中多个传输信道的功率控制

    公开(公告)号：US07664519B2

    公开(公告)日：2010-02-16

    申请号：US10750302

    申请日：2003-12-30

    申请人： Chih-Ping Hsu ,  Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Hyukjun Oh ,  Christopher C. Riddle ,  Nitin Kasturi

    发明人： Chih-Ping Hsu ,  Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Hyukjun Oh ,  Christopher C. Riddle ,  Nitin Kasturi

    IPC分类号： H04B1/00 ,  H04B1/04 ,  H04Q7/20

    CPC分类号： H04W52/12 ,  H04W52/34 ,  H04W52/36

    摘要： Techniques are provided to control the transmit power for data transmission on multiple transport channels having different signal quality (SIR) targets. A single SIR target is maintained for all transport channels, and this SIR target is adjusted based only on active transport channels. For each update interval, a data processor processes at least one data block received in the current update interval on at least one of the transport channels and provides the status of each received data block. A controller increases the SIR target based on an up step if any received data block is erased and decreases the SIR target based on a down step if all received data blocks are good. If any received data block is erased, the down step used to adjust the SIR target may be set to the smallest down step size required by all transport channels with erased data blocks.

    摘要翻译： 提供技术来控制具有不同信号质量（SIR）目标的多个传输信道上的数据传输的发射功率。 对于所有传输信道维持单个SIR目标，并且该SIR目标仅基于主动传输信道进行调整。 对于每个更新间隔，数据处理器处理在当前更新间隔中在至少一个传输信道上接收的至少一个数据块，并提供每个接收到的数据块的状态。 如果任何接收的数据块被擦除，则控制器基于上升步骤增加SIR目标，并且如果所有接收到的数据块都良好，则基于下降步骤降低SIR目标。 如果任何接收到的数据块被擦除，则用于调整SIR目标的下降步骤可以被设置为具有被擦除的数据块的所有传输信道所需的最小的下降步长。

    Reliability determination and combining of power control commands received in a wireless communication system
    3.
    发明授权
    Reliability determination and combining of power control commands received in a wireless communication system 有权
    在无线通信系统中接收的功率控制命令的可靠性确定和组合

    公开(公告)号：US07340268B2

    公开(公告)日：2008-03-04

    申请号：US10457846

    申请日：2003-06-10

    申请人： Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi ,  Messay Amerga ,  Chih-Ping Hsu ,  Christopher C. Riddle ,  Andrew Sendonaris

    发明人： Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi ,  Messay Amerga ,  Chih-Ping Hsu ,  Christopher C. Riddle ,  Andrew Sendonaris

    IPC分类号： H04B7/00 ,  H04Q7/20

    CPC分类号： H04W52/56 ,  H04W52/40 ,  H04W52/58

    摘要： The reliability of transmit power control (TPC) commands received from a transmitter is determined based on a TPC target value. The TPC target value is derived based on a TPC threshold and possibly a weight, depending on the receiver implementation. A received TPC command is considered reliable if its absolute value exceeds the TPC target value. Received TPC commands deemed as unreliable are discarded and not used for power control. Multiple TPC target values, used for detecting UP and DOWN commands, may be derived with multiple scaling factors. For a receiver in soft handover and receiving TPC commands from multiple transmitters, a different TPC target value may be derived for each transmitter. The received TPC commands for each transmitter are compared against that transmitter's TPC target value. Received TPC commands deemed as unreliable are discarded and not combined.

    摘要翻译： 基于TPC目标值确定从发射机接收的发射功率控制（TPC）命令的可靠性。 TPC目标值基于TPC阈值和可能的权重导出，这取决于接收机实现。 如果接收到的TPC命令的绝对值超过TPC目标值，则认为它是可靠的。 被认为不可靠的TPC命令被丢弃，不用于功率控制。 用于检测UP和DOWN命令的多个TPC目标值可以用多个缩放因子导出。 对于软切换中的接收机和从多个发射机接收TPC命令，可以为每个发射机导出不同的TPC目标值。 每个发射机接收的TPC命令与该发射机的TPC目标值进行比较。 被认为不可靠的TPC命令被丢弃并不组合。

    Dynamic demodulator selection based on channel quality
    4.
    发明授权
    Dynamic demodulator selection based on channel quality 有权
    基于信道质量的动态解调器选择

    公开(公告)号：US07899134B2

    公开(公告)日：2011-03-01

    申请号：US11679285

    申请日：2007-02-27

    申请人： Nathaniel Lev Grossman ,  Gokhan Mergen ,  Nitin Kasturi

    发明人： Nathaniel Lev Grossman ,  Gokhan Mergen ,  Nitin Kasturi

    IPC分类号： H03K9/00 ,  H04L27/00

    CPC分类号： H04L1/0036 ,  H04B2201/7071 ,  H04L25/03038

    摘要： In general, this disclosure describes techniques for demodulating wireless signals. In particular, the techniques of this disclosure dynamically select between two or more demodulators based on channel quality information measured over a plurality of measurement periods. For example, a wireless communication device (WCD) may switch from a first demodulator to a second demodulator when the channel quality information associated with the demodulators indicates a better channel quality for the second demodulator than the first demodulator for a consecutive number of measurement periods. As another example, the WCD may compute, for each measurement period, the difference between the channel quality information associated with each of the demodulators, sum the differences, and switch demodulators when the total accumulation of the differences exceeds a threshold.

    摘要翻译： 通常，本公开描述了用于解调无线信号的技术。 特别地，本公开的技术基于在多个测量周期中测量的信道质量信息，在两个或多个解调器之间动态地选择。 例如，当与解调器相关联的信道质量信息指示对于第二解调器的信道质量优于第一解调器时，连续数量的测量周期，无线通信设备（WCD）可以从第一解调器切换到第二解调器。 作为另一示例，WCD可以在每个测量周期中计算与每个解调器相关联的信道质量信息之间的差值，并且当差异的总累积超过阈值时对开关解调器进行求和。

    METHOD AND APPARATUS FOR FILTERING NOISY ESTIMATES TO REDUCE ESTIMATION ERRORS
    5.
    发明申请
    METHOD AND APPARATUS FOR FILTERING NOISY ESTIMATES TO REDUCE ESTIMATION ERRORS 有权
    用于滤除噪声估计以减少估计误差的方法和装置

    公开(公告)号：US20100158175A1

    公开(公告)日：2010-06-24

    申请号：US12712924

    申请日：2010-02-25

    申请人： Gokhan Mergen ,  Paravathanathan Subrahmanya ,  Vijayaraj Alilaghatta-Kantharaj ,  Nitin Kasturi

    发明人： Gokhan Mergen ,  Paravathanathan Subrahmanya ,  Vijayaraj Alilaghatta-Kantharaj ,  Nitin Kasturi

    IPC分类号： H04B1/10

    CPC分类号： H04L25/025 ,  H04B17/3913 ,  H04B2201/70701 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/03038

    摘要： Techniques for filtering noisy estimates to reduce estimation errors are described. A sequence of input values (e.g., for an initial channel impulse response estimate (CIRE)) is filtered with an infinite impulse response (IIR) filter having at least one coefficient to obtain a sequence of output values (e.g., for a filtered CIRE). The coefficient(s) are updated based on the sequence of input values with an adaptive filter, a bank of prediction filters, or a normalized variation technique. To update the coefficient(s) with the adaptive filter, a sequence of predicted values is derived based on the sequence of input values. Prediction errors between the sequence of predicted values and the sequence of input values are determined and filtered to obtain filtered prediction errors. The coefficient(s) of the IIR filter are then updated based on the prediction errors and the filtered prediction errors.

    摘要翻译： 描述了用于过滤噪声估计以减少估计误差的技术。 输入值的序列（例如，对于初始信道脉冲响应估计（CIRE））用具有至少一个系数的无限脉冲响应（IIR）滤波器进行滤波以获得输出值序列（例如，对于滤波后的CIRE） 。 基于具有自适应滤波器，预测滤波器组或归一化变化技术的输入值的序列来更新系数。 为了用自适应滤波器更新系数，基于输入值的序列导出预测值序列。 确定并过滤预测值序列与输入值序列之间的预测误差，以获得滤波预测误差。 然后基于预测误差和滤波预测误差来更新IIR滤波器的系数。

    Fast converging power control for wireless communication systems
    6.
    发明授权
    Fast converging power control for wireless communication systems 有权
    无线通信系统的快速收敛功率控制

    公开(公告)号：US07702350B2

    公开(公告)日：2010-04-20

    申请号：US10387973

    申请日：2003-03-12

    申请人： Hyukjun Oh ,  Luca Blessent ,  Chih-Ping Hsu ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

    发明人： Hyukjun Oh ,  Luca Blessent ,  Chih-Ping Hsu ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

    IPC分类号： H04B7/00 ,  H04B1/00 ,  H01Q11/12

    CPC分类号： H04W52/362 ,  H04W52/12 ,  H04W52/143 ,  H04W52/24 ,  H04W52/367

    摘要： Techniques to quickly adjust an SIR target toward a final value needed to achieve a specified target BLER for a data transmission. The outer loop may be implemented with multiple modes. The SIR target may be maintained fixed in a hold mode, adjusted in large down steps to speed up convergence in an acquisition mode, and adjusted by a small down step and a large up step for good and erased blocks, respectively, in a tracking mode. Various schemes may be used to adjust the SIR target by larger down steps in the acquisition mode. These schemes may be used even if data is transmitted intermittently, the target BLER is set to a low value, and/or one or multiple transport channels are used for data transmission. The SIR target may be boosted by a particular amount upon transitioning from the acquisition mode to the tracking mode.

    摘要翻译： 将SIR目标快速调整到实现数据传输的指定目标BLER所需的最终值的技术。 外部环路可以用多种模式来实现。 SIR目标可以在保持模式下保持固定，在大的下降步骤中调整以加速采集模式中的收敛，并且在跟踪模式下分别对于好的和擦除的块分别进行小的向下步长和大的上升步长的调整 。 可以使用各种方案来在采集模式中通过较大的下降步骤来调整SIR目标。 即使间歇地发送数据，目标BLER被设置为低值，和/或一个或多个传输信道用于数据传输，也可以使用这些方案。 在从采集模式转换到跟踪模式时，SIR目标可以被提升特定的量。

    METHODS AND APPARATUS FOR PREDICTING A CHANNEL QUALITY INDICATOR IN A COMMUNICATION SYSTEM
    7.
    发明申请
    METHODS AND APPARATUS FOR PREDICTING A CHANNEL QUALITY INDICATOR IN A COMMUNICATION SYSTEM 有权
    在通信系统中预测通道质量指标的方法和装置

    公开(公告)号：US20090203339A1

    公开(公告)日：2009-08-13

    申请号：US12109436

    申请日：2008-04-25

    申请人： Gokhan Mergen ,  Manini S. Shah ,  Nathaniel Lev Grossman ,  Nitin Kasturi ,  Yan Li

    发明人： Gokhan Mergen ,  Manini S. Shah ,  Nathaniel Lev Grossman ,  Nitin Kasturi ,  Yan Li

    IPC分类号： H04B17/00

    CPC分类号： H04L1/20 ,  H04L1/0026

    摘要： Disclosed are methods and apparatus for predicting a channel quality indicator in a communication system, and in particular a delayed receiver. A disclosed method for determining the predictive channel quality indicator for a delayed receiver includes determining at least one channel quality indicator from a non-delayed receiver. The method also includes determining another channel quality indicator from the delayed receiver, and then calculating the predictive channel quality indicator for the delayed receiver through a function of the channel quality indicators from the non-delayed receiver and the channel quality indicator from the delayed receiver. Corresponding apparatus are also disclosed.

    摘要翻译： 公开了用于预测通信系统中的信道质量指示符的方法和装置，特别是延迟的接收机。 用于确定延迟接收机的预测信道质量指示符的公开方法包括从非延迟接收机确定至少一个信道质量指示符。 该方法还包括从延迟的接收机确定另一信道质量指示符，然后通过来自非延迟接收机的信道质量指示符和来自延迟接收机的信道质量指示符的函数来计算延迟接收机的预测信道质量指示符。 还公开了相应的装置。

    Method and apparatus for filtering noisy estimates to reduce estimation errors
    8.
    发明申请
    Method and apparatus for filtering noisy estimates to reduce estimation errors 有权
    用于过滤噪声估计以减少估计误差的方法和装置

    公开(公告)号：US20070110201A1

    公开(公告)日：2007-05-17

    申请号：US11489087

    申请日：2006-07-18

    申请人： Gokhan Mergen ,  Parvathanathan Subrahmanya ,  Vijayaraj Alilaghatta-Kantharaj ,  Nitin Kasturi

    发明人： Gokhan Mergen ,  Parvathanathan Subrahmanya ,  Vijayaraj Alilaghatta-Kantharaj ,  Nitin Kasturi

    IPC分类号： H04B1/10

    CPC分类号： H04L25/025 ,  H04B17/3913 ,  H04B2201/70701 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/03038

    摘要： Techniques for filtering noisy estimates to reduce estimation errors are described. A sequence of input values (e.g., for an initial channel impulse response estimate (CIRE)) is filtered with an infinite impulse response (IIR) filter having at least one coefficient to obtain a sequence of output values (e.g., for a filtered CIRE). The coefficient(s) are updated based on the sequence of input values with an adaptive filter, a bank of prediction filters, or a normalized variation technique. To update the coefficient(s) with the adaptive filter, a sequence of predicted values is derived based on the sequence of input values. Prediction errors between the sequence of predicted values and the sequence of input values are determined and filtered to obtain filtered prediction errors. The coefficient(s) of the IIR filter are then updated based on the prediction errors and the filtered prediction errors.

    摘要翻译： 描述了用于过滤噪声估计以减少估计误差的技术。 输入值的序列（例如，对于初始信道脉冲响应估计（CIRE））用具有至少一个系数的无限脉冲响应（IIR）滤波器进行滤波，以获得输出值序列（例如，对于滤波后的CIRE） 。 基于具有自适应滤波器，预测滤波器组或归一化变化技术的输入值的序列来更新系数。 为了用自适应滤波器更新系数，基于输入值的序列导出预测值序列。 确定并过滤预测值序列与输入值序列之间的预测误差，以获得滤波预测误差。 然后基于预测误差和滤波预测误差来更新IIR滤波器的系数。