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1. 发明授权

US08718210B2 Channel impulse response estimation for wireless receiver 有权
标题翻译：无线接收机的信道脉冲响应估计
公开(公告)号：US08718210B2
公开(公告)日：2014-05-06
申请号：US13237868
申请日：2011-09-20
申请人： Mariam Motamed , Alexei Yurievitch Gorokhov , Mike L. Mccloud , Parvathanathan Subrahmanya
发明人： Mariam Motamed , Alexei Yurievitch Gorokhov , Mike L. Mccloud , Parvathanathan Subrahmanya
IPC分类号： H03D1/04 , H03D1/06 , H03K5/01 , H03K6/04 , H04B1/10 , H04L1/00 , H04L25/08
CPC分类号： H04L5/0051 , H04L25/0212 , H04L25/0224
摘要： Estimating a channel impulse response (CIR) for a wireless transmission, for example a multimedia broadcast multicast services single frequency network (MBSFN) transmission, may be performed by a receiver of an wireless subframe, without requiring operational memory in excess of what is needed for CIR estimation of unicast signaling, while providing enhanced delay spread coverage. The wireless subframe may be a MBSFN subframe. The receiver may form an aggregate vector of pilot tones extracted from an OFDM reference symbol of an wireless subframe. The receiver may subsample the aggregate vector to obtain a plurality of sub-vectors each comprising a distinct subsampling phase. The receiver may process the plurality of sub-vectors using an inverse fast Fourier transform to obtain time domain representations of each of the sub-vectors. The receiver may combine the time domain representations in various ways to obtain a CIR estimate for the wireless subframe.
摘要翻译：估计用于无线传输的信道脉冲响应（CIR），例如多媒体广播多播服务单频网（MBSFN）传输，可以由无线子帧的接收机执行，而不需要超过所需的操作存储器 CIR估计单播信令，同时提供增强的延迟扩展覆盖。无线子帧可以是MBSFN子帧。接收机可以形成从无线子帧的OFDM参考符号提取的导频音的聚合向量。接收机可以对聚合向量进行子采样以获得每个包括不同子采样相位的多个子向量。接收机可以使用快速傅里叶逆变换处理多个子向量，以获得每个子向量的时域表示。接收机可以以各种方式组合时域表示以获得无线子帧的CIR估计。

2. 发明申请

US20130070869A1 CHANNEL IMPULSE RESPONSE ESTIMATION FOR WIRELESS RECEIVER 有权
标题翻译：无线接收机的通道响应估计
公开(公告)号：US20130070869A1
公开(公告)日：2013-03-21
申请号：US13237868
申请日：2011-09-20
申请人： Mariam Motamed , Alexei Yurievitch Gorokhov , Mike L. Mccloud , Parvathanathan Subrahmanya
发明人： Mariam Motamed , Alexei Yurievitch Gorokhov , Mike L. Mccloud , Parvathanathan Subrahmanya
IPC分类号： H04L27/06 , H04L27/00
CPC分类号： H04L5/0051 , H04L25/0212 , H04L25/0224
摘要： Estimating a channel impulse response (CIR) for a wireless transmission, for example a multimedia broadcast multicast services single frequency network (MBSFN) transmission, may be performed by a receiver of an wireless subframe, without requiring operational memory in excess of what is needed for CIR estimation of unicast signaling, while providing enhanced delay spread coverage. The wireless subframe may be a MBSFN subframe. The receiver may form an aggregate vector of pilot tones extracted from an OFDM reference symbol of an wireless subframe. The receiver may subsample the aggregate vector to obtain a plurality of sub-vectors each comprising a distinct subsampling phase. The receiver may process the plurality of sub-vectors using an inverse fast Fourier transform to obtain time domain representations of each of the sub-vectors. The receiver may combine the time domain representations in various ways to obtain a CIR estimate for the wireless subframe.
摘要翻译：估计用于无线传输的信道脉冲响应（CIR），例如多媒体广播多播服务单频网（MBSFN）传输，可以由无线子帧的接收机执行，而不需要超过所需的操作存储器 CIR估计单播信令，同时提供增强的延迟扩展覆盖。无线子帧可以是MBSFN子帧。接收机可以形成从无线子帧的OFDM参考符号提取的导频音的聚合向量。接收机可以对聚合向量进行子采样以获得每个包括不同子采样相位的多个子向量。接收机可以使用快速傅里叶逆变换处理多个子向量，以获得每个子向量的时域表示。接收机可以以各种方式组合时域表示以获得无线子帧的CIR估计。

3. 发明授权

US07929652B2 Adaptive pilot and data symbol estimation 有权
标题翻译：自适应导频和数据符号估计
公开(公告)号：US07929652B2
公开(公告)日：2011-04-19
申请号：US11733646
申请日：2007-04-10
申请人： Farrokh Abrishamkar , Mariam Motamed , Parvathanathan Subrahmanya
发明人： Farrokh Abrishamkar , Mariam Motamed , Parvathanathan Subrahmanya
IPC分类号： H03D1/04 , H03K9/00
CPC分类号： H04L25/0228
摘要： Techniques for performing adaptive channel estimation are described. A receiver derives channel estimates for a wireless channel based on received pilot symbols and at least one estimation parameter. The receiver updates the at least one estimation parameter based on the received pilot symbols. The at least one estimation parameter may be for an innovations representation model of the wireless channel and may be updated based on a cost function with costs defined by prediction errors. In one design, the receiver derives predicted pilot symbols based on the received pilot symbols and the at least one estimation parameter, determines prediction errors based on the received pilot symbols and the predicted pilot symbols, and further derives error gradients based on the prediction errors. The receiver then updates the at least one estimation parameter based on the error gradients and the prediction errors, e.g., if a stability test is satisfied.
摘要翻译：描述用于执行自适应信道估计的技术。接收机基于接收的导频符号和至少一个估计参数导出无线信道的信道估计。接收机基于接收的导频符号来更新至少一个估计参数。所述至少一个估计参数可以是针对无线信道的创新表示模型，并且可以基于具有由预测误差定义的成本的成本函数来更新。在一种设计中，接收器基于接收到的导频符号和至少一个估计参数导出预测的导频符号，基于接收到的导频符号和预测的导频符号来确定预测误差，并且还基于预测误差导出误差梯度。然后，接收器基于误差梯度和预测误差来更新至少一个估计参数，例如，如果满足稳定性测试。

4. 发明申请

US20080253487A1 ADAPTIVE PILOT AND DATA SYMBOL ESTIMATION 有权
标题翻译：自适应导航和数据符号估计
公开(公告)号：US20080253487A1
公开(公告)日：2008-10-16
申请号：US11733646
申请日：2007-04-10
申请人： Farrokh Abrishamkar , Mariam Motamed , Parvathanathan Subrahmanya
发明人： Farrokh Abrishamkar , Mariam Motamed , Parvathanathan Subrahmanya
IPC分类号： H04L1/20
CPC分类号： H04L25/0228
摘要： Techniques for performing adaptive channel estimation are described. A receiver derives channel estimates for a wireless channel based on received pilot symbols and at least one estimation parameter. The receiver updates the at least one estimation parameter based on the received pilot symbols. The at least one estimation parameter may be for an innovations representation model of the wireless channel and may be updated based on a cost function with costs defined by prediction errors. In one design, the receiver derives predicted pilot symbols based on the received pilot symbols and the at least one estimation parameter, determines prediction errors based on the received pilot symbols and the predicted pilot symbols, and further derives error gradients based on the prediction errors. The receiver then updates the at least one estimation parameter based on the error gradients and the prediction errors, e.g., if a stability test is satisfied.
摘要翻译：描述用于执行自适应信道估计的技术。接收机基于接收的导频符号和至少一个估计参数导出无线信道的信道估计。接收机基于接收的导频符号来更新至少一个估计参数。所述至少一个估计参数可以是针对无线信道的创新表示模型，并且可以基于具有由预测误差定义的成本的成本函数来更新。在一种设计中，接收器基于接收到的导频符号和至少一个估计参数导出预测的导频符号，基于接收到的导频符号和预测的导频符号来确定预测误差，并且还基于预测误差导出误差梯度。然后，接收器基于误差梯度和预测误差来更新至少一个估计参数，例如，如果满足稳定性测试。

5. 发明授权

US08976903B2 Unified iterative decoding architecture using joint LLR extraction and a priori probability 有权
标题翻译：使用联合LLR提取和先验概率的统一迭代解码架构
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。

6. 发明授权

US08406359B2 Method and apparatus for filtering noisy estimates to reduce estimation errors 有权
标题翻译：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：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。

7. 发明申请

US20110105037A1 METHODS AND SYSTEMS FOR INTERFERENCE CANCELLATION IN MULTI-MODE COEXISTENCE MODEMS 审中-公开
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.

8. 发明申请

US20100322126A1 APPARATUS AND METHODS FOR LOW POWER SENSING OF COMMUNICATION ACCESS TECHNOLOGIES 有权
标题翻译：通信接入技术低功率感测装置及方法
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。

9. 发明申请

US20100304761A1 SENSOR USES IN COMMUNICATION SYSTEMS 有权
标题翻译：传感器在通信系统中的应用
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。

10. 发明授权

US07796549B2 Method and apparatus for time-aligning transmissions from multiple base stations in a CDMA communication system 有权
标题翻译：用于在CDMA通信系统中对来自多个基站的传输进行时间调整的方法和装置
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）。

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