公开(公告)号：US08406359B2

公开(公告)日：2013-03-26

申请号：US12712907

申请日：2010-02-25

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

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

IPC: H04B1/10

CPC classification number: H04L25/025 ,  H04B17/3913 ,  H04B2201/70701 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/03038

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20110105037A1

公开(公告)日：2011-05-05

申请号：US12831474

申请日：2010-07-07

Applicant: Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B15/00

CPC classification number: H04B1/525 ,  H04B1/3805 ,  H04B1/406

Abstract: Certain embodiments of the present disclosure support techniques for interference cancellation in a multi-mode wireless modem that supports coexistence of different radio technologies.

公开(公告)号：US07746970B2

公开(公告)日：2010-06-29

申请号：US11489087

申请日：2006-07-18

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

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

IPC: H04B1/10

CPC classification number: H04L25/025 ,  H04B17/3913 ,  H04B2201/70701 ,  H04L25/0212 ,  H04L25/0228 ,  H04L25/03038

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07675962B2

公开(公告)日：2010-03-09

申请号：US11399886

申请日：2006-04-07

Applicant: Gokhan Mergen ,  Vignesh Suthuraman ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Gokhan Mergen ,  Vignesh Suthuraman ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B1/00

CPC classification number: H04L25/0216 ,  H04L25/0218

Abstract: Techniques for deriving a channel impulse response estimate (CIRE) having improved quality are described. A first CIRE with multiple channel taps is obtained based on (1) an initial CIRE derived from a received pilot or (2) a filtered CIRE derived from the initial CIRE. In one aspect, the channel taps in the first CIRE are scaled with multiple scaling factors to obtain a second CIRE. For point-wise LMMSE scaling, the energy of each channel tap is estimated. The noise energy for the channel taps is also estimated, e.g., based on energies of channel taps on one or both edges of the first CIRE. Each channel tap is scaled based on a scaling factor determined by the energy of that channel tap and the noise energy. Each channel tap with energy below a threshold may be set to zero. In another aspect, the second CIRE is obtained by zeroing out selected ones of the channel taps in the first CIRE.

Abstract translation: 描述了用于导出具有改进的质量的信道脉冲响应估计（CIRE）的技术。 基于（1）从接收到的导频导出的初始CIRE或（2）从初始CIRE导出的滤波CIRE，获得具有多信道抽头的第一CIRE。 在一个方面，第一CIRE中的信道抽头被多个缩放因子缩放以获得第二CIRE。 对于逐点LMMSE缩放，估计每个通道抽头的能量。 也可以例如基于第一CIRE的一个或两个边缘上的信道抽头的能量来估计信道抽头的噪声能量。 每个通道抽头基于由该通道抽头的能量和噪声能量确定的缩放因子进行缩放。 能量低于阈值的每个通道抽头可以设置为零。 在另一方面，第二CIRE是通过对第一CIRE中的选通的信道抽头进行归零而获得的。

公开(公告)号：US07363010B2

公开(公告)日：2008-04-22

申请号：US10827143

申请日：2004-04-15

Applicant: Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi

Inventor： Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi

IPC: H04B17/00

CPC classification number: H04W52/12 ,  H04W52/28

Abstract: Techniques for controlling transmit power for a data transmission sent on multiple data channels, which may be intermittently active, are described. Each data channel is monitored for activity (e.g., based on an error correction code, received signaling information, received block energy, and so on) and deemed to be dormant or not dormant (e.g., based on the amount of elapsed time since activity was last detected on the data channel). A signal quality (SIR) target may be maintained for each non-dormant data channel and updated based on the status of received data blocks for the data channel. A final SIR target, used for power control of the data transmission, may be set to the highest SIR target among the SIR targets for the non-dormant data channels. The final SIR target may also be updated directly based on the status of received data blocks for the non-dormant data channels.

Abstract translation: 描述了用于控制在可能间歇地活动的多个数据信道上发送的数据传输的发送功率的技术。 监视每个数据信道的活动（例如，基于纠错码，接收的信令信息，接收到的块能量等等），并被认为是休眠或不休眠（例如，基于从活动以来的经过时间量 最后在数据通道上检测到）。 可以为每个非休眠数据信道维持信号质量（SIR）目标，并且基于数据信道的接收数据块的状态来更新。 可以将用于数据传输的功率控制的最终SIR目标设置为非休眠数据信道的SIR目标中的最高SIR目标。 也可以基于非休眠数据信道的接收数据块的状态来直接更新最终SIR目标。

公开(公告)号：US08576965B2

公开(公告)日：2013-11-05

申请号：US12831462

申请日：2010-07-07

Applicant: Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B1/10

CPC classification number: H04B1/525 ,  G01S19/21 ,  H04B1/3805 ,  H04B1/406

Abstract: Certain embodiments of the present disclosure support techniques for interference cancellation in a multi-mode wireless modem that supports coexistence of different radio technologies.

Abstract translation: 本公开的某些实施例支持支持不同无线电技术共存的多模式无线调制解调器中的干扰消除技术。

公开(公告)号：US20110103431A1

公开(公告)日：2011-05-05

申请号：US12831462

申请日：2010-07-07

Applicant: Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B1/10 ,  H04B1/707

CPC classification number: H04B1/525 ,  G01S19/21 ,  H04B1/3805 ,  H04B1/406

Abstract: Certain embodiments of the present disclosure support techniques for interference cancellation in a multi-mode wireless modem that supports coexistence of different radio technologies.

Abstract translation: 本公开的某些实施例支持支持不同无线电技术共存的多模式无线调制解调器中的干扰消除技术。

公开(公告)号：US07899480B2

公开(公告)日：2011-03-01

申请号：US11217242

申请日：2005-08-31

Applicant: Erumusele O. Odigie ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Erumusele O. Odigie ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B7/00

CPC classification number: H04W52/221 ,  H04W52/223 ,  H04W52/267 ,  H04W52/346 ,  H04W52/367 ,  Y02D70/124

Abstract: An apparatus, system, and method efficiently manage transmission power in a user equipment (UE) device by maintaining and applying an authorized power level to determine a transmission power level after a power limited transmission and before a new power control command has been received. The UE device maintains the authorized power level by monitoring and adjusting the authorized power level based on received power control commands. After a power limited transmission where the maximum power level is less than the authorized power level, the UE device determines the transmission power level for the next transmission based on the authorized power level. Accordingly, after the power limiting situation has ceased, the UE device transmits at the optimum power level eliminating the inefficiencies of transmitting at a lower than authorized power before the next power control command is received.

Abstract translation: 一种装置，系统和方法通过维持和应用授权功率电平来有效地管理用户设备（UE）设备中的发射功率，以确定在功率限制传输之后和在接收到新的功率控制命令之前的发射功率电平。 UE设备通过基于接收到的功率控制命令监视和调整授权功率电平来维持授权功率电平。 在最大功率电平小于授权功率电平的功率限制传输之后，UE设备基于授权功率电平确定用于下一次传输的传输功率电平。 因此，在功率限制情况已经停止之后，UE接收到下一个功率控制命令之前，以最佳功率电平发送消除低于授权功率的低效发送的低效率。

公开(公告)号：US20070110127A1

公开(公告)日：2007-05-17

申请号：US11399886

申请日：2006-04-07

Applicant: Gokhan Mergen ,  Vignesh Sethuraman ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Gokhan Mergen ,  Vignesh Sethuraman ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B1/00 ,  H04L27/06 ,  H04B1/10

CPC classification number: H04L25/0216 ,  H04L25/0218

Abstract: Techniques for deriving a channel impulse response estimate (CIRE) having improved quality are described. A first CIRE with multiple channel taps is obtained based on (1) an initial CIRE derived from a received pilot or (2) a filtered CIRE derived from the initial CIRE. In one aspect, the channel taps in the first CIRE are scaled with multiple scaling factors to obtain a second CIRE. For point-wise LMMSE scaling, the energy of each channel tap is estimated. The noise energy for the channel taps is also estimated, e.g., based on energies of channel taps on one or both edges of the first CIRE. Each channel tap is scaled based on a scaling factor determined by the energy of that channel tap and the noise energy. Each channel tap with energy below a threshold may be set to zero. In another aspect, the second CIRE is obtained by zeroing out selected ones of the channel taps in the first CIRE.

Abstract translation: 描述了用于导出具有改进的质量的信道脉冲响应估计（CIRE）的技术。 基于（1）从接收到的导频导出的初始CIRE或（2）从初始CIRE导出的滤波CIRE，获得具有多信道抽头的第一CIRE。 在一个方面，第一CIRE中的信道抽头被多个缩放因子缩放以获得第二CIRE。 对于逐点LMMSE缩放，估计每个通道抽头的能量。 也可以例如基于第一CIRE的一个或两个边缘上的信道抽头的能量来估计信道抽头的噪声能量。 每个通道抽头基于由该通道抽头的能量和噪声能量确定的缩放因子进行缩放。 能量低于阈值的每个通道抽头可以设置为零。 在另一方面，第二CIRE是通过对第一CIRE中的选通的信道抽头进行归零而获得的。

公开(公告)号：US20050249149A1

公开(公告)日：2005-11-10

申请号：US10841299

申请日：2004-05-07

Applicant: Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B7/005 ,  H04W52/22 ,  H04W52/36 ,  H04Q7/00

CPC classification number: H04W52/221 ,  H04W52/146 ,  H04W52/367

Abstract: Techniques to mitigate spikes in transmit power, by reducing the magnitude and/or duration of the spikes, are described. Initially, power control is performed in a normal manner and in accordance with a transmit power control (TPC) scheme. If a (e.g., upward) transmit power spike is detected, the power control is performed in a manner to mitigate the adverse effects of the spike and in accordance with another TPC scheme. An upward transmit power spike may be detected, e.g., if a predetermined number of consecutive TPC commands in the upward direction is obtained for increasing transmit power. The upward transmit power spike may be mitigated by limiting the transmit power, reducing the rate of transmit power adjustment in the upward direction, delaying and/or filtering TPC decisions used for transmit power adjustment, preventing upward adjustment of transmit power, and so on. Multiple states may be defined and used to facilitate power control with spike mitigation.

Abstract translation: 描述了通过减小​​尖峰的幅度和/或持续时间来减轻发射功率尖峰的技术。 最初，按照发送功率控制（TPC）方式，以正常的方式进行功率控制。 如果检测到（例如，向上）发射功率尖峰，则以减轻尖峰的不利影响并根据另一TPC方案的方式执行功率控制。 可以检测向上的发送功率尖峰，例如，如果获得了向上方向上的预定数量的连续TPC命令以增加发射功率。 通过限制发射功率，降低向上方向的发射功率调整速率，延迟和/或滤波用于发射功率调整的TPC决定，防止发射功率的向上调整等，可以减轻向上发射功率尖峰。 多个状态可以被定义并用于通过尖峰减轻来促进功率控制。