公开(公告)号：US06771692B2

公开(公告)日：2004-08-03

申请号：US09964589

申请日：2001-09-25

申请人： Roland Reinhard Rick ,  Parvathanathan Subrahmanya ,  Brian K. Butler ,  Shimman Patel ,  Thunyachate Ekvetchavit

发明人： Roland Reinhard Rick ,  Parvathanathan Subrahmanya ,  Brian K. Butler ,  Shimman Patel ,  Thunyachate Ekvetchavit

IPC分类号： H04B1707

CPC分类号： H04B1/7085 ,  H04B1/7115 ,  H04B7/0667 ,  H04B7/0697 ,  H04B2201/70701

摘要： In an antenna diversity environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-negligible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time tracking loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different timing offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

公开(公告)号：US07702001B2

公开(公告)日：2010-04-20

申请号：US10789535

申请日：2004-02-26

申请人： Roland Reinhard Rick ,  Parvathanathan Subrahmanya ,  Brian K. Butler ,  Shimman Patel ,  Thunyachate Ekvetchavit

发明人： Roland Reinhard Rick ,  Parvathanathan Subrahmanya ,  Brian K. Butler ,  Shimman Patel ,  Thunyachate Ekvetchavit

IPC分类号： H04B1/707

CPC分类号： H04B1/7085 ,  H04B1/7115 ,  H04B7/0667 ,  H04B7/0697 ,  H04B2201/70701

摘要： In an antenna diversity environment, the timing offset of the receiver's fingers are based on the timing offset of the received peaks of the base station transmit signals. In a system with non-negligible multipath spacing, the timing offset of the received peaks of the base station transmit signals are not necessarily at the same location. In one embodiment, the demodulating elements for the signal from each base station antenna use the same offset for demodulating and determining an error signal based on pilot signal sampling prior to the timing offset and subsequent to the timing offset. The error signals are averaged and used by a time tracking loop to track the incoming signal. In another embodiment, the demodulating elements for the signal from each base station antenna independently time track the signals with different timing offsets for each finger. The preferred embodiment depends on the method used by the base station to multiplex the data onto multiple transmit antennas.

摘要翻译： 在天线分集环境中，接收机手指的定时偏移基于基站发射信号的接收峰值的定时偏移。 在具有不可忽略的多路径间隔的系统中，基站发射信号的接收峰值的定时偏移不一定在相同的位置。 在一个实施例中，用于来自每个基站天线的信号的解调元件使用相同的偏移量来解调和确定基于在定时偏移之前和定时偏移之后的导频信号采样的误差信号。 误差信号被平均并由时间跟踪环路用于跟踪输入信号。 在另一个实施例中，用于来自每个基站天线的信号的解调元件独立地对每个手指的不同定时偏移时间跟踪信号。 优选实施例取决于基站用于将数据复用到多个发射天线上的方法。

公开(公告)号：US08976903B2

公开(公告)日：2015-03-10

申请号：US12552673

申请日：2009-09-02

申请人： Parvathanathan Subrahmanya ,  Andrew Sendonaris ,  Jia Tang ,  Atul A. Salvekar ,  Shantanu Khare ,  Jong Hyeon Park ,  Brian C. Banister ,  Tao Cui

发明人： Parvathanathan Subrahmanya ,  Andrew Sendonaris ,  Jia Tang ,  Atul A. Salvekar ,  Shantanu Khare ,  Jong Hyeon Park ,  Brian C. Banister ,  Tao Cui

IPC分类号： H04L27/00 ,  H04L1/06 ,  H04L1/00 ,  H04L25/03

CPC分类号： H04L1/06 ,  H04L1/005 ,  H04L1/0051 ,  H04L25/03171

摘要： Certain aspects of the present disclosure relate to a method and an apparatus for unified iterative demodulation-decoding that can be employed in both multiple-input multiple-output (MIMO) and non-MIMO wireless systems.

摘要翻译： 本公开的某些方面涉及可以在多输入多输出（MIMO）和非MIMO无线系统中使用的用于统一迭代解调 - 解码的方法和装置。

公开(公告)号：US08406359B2

公开(公告)日：2013-03-26

申请号：US12712907

申请日：2010-02-25

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。

公开(公告)号：US20110105037A1

公开(公告)日：2011-05-05

申请号：US12831474

申请日：2010-07-07

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

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

IPC分类号： H04B15/00

CPC分类号： H04B1/525 ,  H04B1/3805 ,  H04B1/406

摘要： 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：US20100322126A1

公开(公告)日：2010-12-23

申请号：US12610296

申请日：2009-10-31

申请人： Dilip Krishnaswamy ,  Parag M. Kanade ,  Parvathanathan Subrahmanya

发明人： Dilip Krishnaswamy ,  Parag M. Kanade ,  Parvathanathan Subrahmanya

IPC分类号： G08C17/00

CPC分类号： H04W52/028 ,  H04W48/16 ,  H04W48/18 ,  H04W52/0229 ,  H04W88/06 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142 ,  Y02D70/146

摘要： Apparatus and methods for low power sensing of wireless access technologies are disclosed. In particular, a mobile wireless device, such as an access terminal, may utilize a lower power circuitry portion that operates at a lower power than active circuitry, such as a primary transceiver. The lower power circuitry portion includes a configurable searcher that is capable of sensing if signals of one or more various wireless access technologies are present. When the wireless device utilizes sleep or idle modes for power savings, use of the lower power sensing circuitry to sense the presence of wireless access technologies, rather than using an awoken higher power primary transceiver for sensing, affords increased power savings. An added ability of the lower power circuitry to be put into sleep or idles modes achieves even greater power savings.

摘要翻译： 公开了用于无线接入技术的低功率感测的装置和方法。 具体地，诸如接入终端的移动无线设备可以利用比诸如主收发器的有源电路低的功率操作的较低功率电路部分。 较低功率电路部分包括能够感测是否存在一种或多种各种无线接入技术的信号的可配置搜索器。 当无线设备利用睡眠或空闲模式进行功率节省时，使用低功率感测电路来感测无线接入技术的存在，而不是使用唤醒的较高功率的主收发器来进行感测，从而提供更大的功率节省。 低功率电路进入睡眠或空闲模式的附加功能实现了更大的功率节省。

公开(公告)号：US20100304761A1

公开(公告)日：2010-12-02

申请号：US12473190

申请日：2009-05-27

申请人： Cristina A. Seibert ,  Douglas Neal Rowitch ,  Parvathanathan Subrahmanya ,  Leonid Sheynblat

发明人： Cristina A. Seibert ,  Douglas Neal Rowitch ,  Parvathanathan Subrahmanya ,  Leonid Sheynblat

IPC分类号： H04W52/04 ,  H04W64/00

CPC分类号： H04W52/0254 ,  H03G3/3078 ,  H04B1/7085 ,  H04B1/7117 ,  H04L25/03019 ,  H04L2025/03566 ,  H04W48/16 ,  Y02D70/122 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/164 ,  Y02D70/40

摘要： Methods and apparatus are directed to mobile devices utilizing motion and/or position sensors for improving operating performance and/or power efficiency. In one example, a method for reducing power consumption in a mobile device includes receiving movement information, establishing movement data based on the movement information, determining if the mobile device is stationary using the movement data; and reducing the frequency of searching for a base station when the mobile device is stationary. In another example, a mobile device which reduces power consumption based upon movement data includes an RF front end, a receiver coupled to the RF front end, a data demodulator coupled to the receiver, a searcher, coupled to the RF front end and the receiver, which searches for base stations, and a processing unit coupled to the searcher, wherein the processing unit controls the searcher based upon the stationarity of the mobile device.

摘要翻译： 方法和装置涉及利用运动和/或位置传感器来改善操作性能和/或功率效率的移动设备。 在一个示例中，用于降低移动设备中的功耗的方法包括接收移动信息，基于移动信息建立移动数据，使用移动数据确定移动设备是否静止; 并且当移动设备静止时降低搜索基站的频率。 在另一示例中，基于移动数据降低功耗的移动设备包括RF前端，耦合到RF前端的接收器，耦合到接收器的数据解调器，耦合到RF前端和接收器的搜索器 ，其搜索基站，以及耦合到搜索器的处理单元，其中处理单元基于移动设备的平稳性来控制搜索者。

公开(公告)号：US07796549B2

公开(公告)日：2010-09-14

申请号：US12019596

申请日：2008-01-24

申请人： Francesco Grilli ,  Charles E. Wheatley, III ,  Serge D. Willenegger ,  Parvathanathan Subrahmanya

发明人： Francesco Grilli ,  Charles E. Wheatley, III ,  Serge D. Willenegger ,  Parvathanathan Subrahmanya

IPC分类号： H04W4/00

CPC分类号： H04W56/002 ,  H04B7/2668 ,  H04B2201/70702 ,  H04W56/001 ,  H04W56/0015 ,  H04W56/0045 ,  H04W92/20

摘要： Schemes to time-align transmissions from multiple base stations to a terminal. To achieve time-alignment, differences between the arrival times of transmissions from the base stations, as observed at the terminal, are determined and provided to the system and used to adjust the timing at the base stations such that terminal-specific radio frames arrive at the terminal within a particular time window. In one scheme, a time difference between two base stations is partitioned into a frame-level time difference and a chip-level time difference. Whenever requested to perform and report time difference measurements, the terminal measures the chip-level timing for each candidate base station relative to a reference base station. Additionally, the terminal also measures the frame-level timing and includes this information in the time difference measurement only if required. Otherwise, the terminal sets the frame-level part to a predetermined value (e.g., zero).

摘要翻译： 将来自多个基站的传输时间对齐到终端的方案。 为了实现时间对准，确定在终端观察到的来自基站的传输的到达时间之间的差异，并将其提供给系统，并用于调整基站处的定时，使得终端专用无线帧到达 终端在特定的时间窗口内。 在一个方案中，两个基站之间的时差被划分为帧级时间差和码片级时间差。 无论何时请求执行和报告时差测量，终端测量每个候选基站相对于参考基站的芯片级定时。 此外，终端还测量帧级定时，并且仅在需要时在时差测量中包括该信息。 否则，终端将帧级部分设置为预定值（例如，零）。

公开(公告)号：US07746970B2

公开(公告)日：2010-06-29

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。

公开(公告)号：US20100150212A1

公开(公告)日：2010-06-17

申请号：US12711991

申请日：2010-02-24

申请人： Thejaswi Bharadwaj Madapushi Sheshadri ,  Brian Dong ,  Messay Amerga ,  Chih-Ping Hsu ,  Parvathanathan Subrahmanya ,  Xiaoming Zhu

发明人： Thejaswi Bharadwaj Madapushi Sheshadri ,  Brian Dong ,  Messay Amerga ,  Chih-Ping Hsu ,  Parvathanathan Subrahmanya ,  Xiaoming Zhu

IPC分类号： H04B1/707

CPC分类号： H04B1/7117 ,  B60L2200/26

摘要： A rake receiver finger assignor is configured to assign a rake receiver finger to a time offset between identified signal path time offsets in accordance with a concentration of identified signal paths from a transmitter to a rake receiver. In accordance with the exemplary embodiment, a number of identified signal paths having time offsets within a time window are observed to determine the concentration of signal paths identified by a path searcher. If the number of identified signal paths indicates a concentrated distribution of signal paths such as during a fat path condition, at least one rake finger is assigned between at a time offset between two identified signal paths.

摘要翻译： 耙式接收器手指分配器被配置为根据从发射机到耙式接收机的识别的信号路径的浓度，将耙机接收机手指分配到所识别的信号路径时间偏移之间的时间偏移。 根据示例性实施例，观察到在时间窗内具有时间偏移的多个识别的信号路径，以确定由路径搜索器识别的信号路径的浓度。 如果所识别的信号路径的数量表示信号路径的集中分布，例如在脂肪路径条件期间，则在两个识别的信号路径之间的时间偏移处分配至少一个耙指。