公开(公告)号：US07006557B2

公开(公告)日：2006-02-28

申请号：US10061873

申请日：2002-01-31

Applicant: Parvathanathan Subrahmanya ,  Kevin J. Clark

Inventor： Parvathanathan Subrahmanya ,  Kevin J. Clark

IPC: H04B1/69

CPC classification number: H04B1/7085 ,  H04B7/0613 ,  H04B2201/70701 ,  Y02D70/40 ,  Y02D70/444

Abstract: Techniques for time tracking diversity pilots are disclosed. In one aspect, an early and a late energy calculation is made on each incoming symbol using a first pilot sequence for despreading. The difference between the two energies is used to drive a tracking loop, which generates a time reference for producing a first pilot estimate and a second pilot estimate, the two estimates used for demodulating data. In another aspect, the early and late energies are made including a plurality of incoming symbols, the number of which corresponds to the number of symbols in a run of positive or negative values in an orthogonalizing sequence. The orthogonalizing sequence is used to generate a second pilot sequence from a first pilot sequence, the resulting second pilot sequence being orthogonal to the first. These aspects have the benefit of simplifying the hardware or processing steps required for transmit diversity time tracking, resulting in cost savings, power savings, simplicity of design, and the like.

公开(公告)号：US20050276248A1

公开(公告)日：2005-12-15

申请号：US10875107

申请日：2004-06-09

Applicant: Amit Butala ,  Parvathanathan Subrahmanya ,  Hyukjun Oh

Inventor： Amit Butala ,  Parvathanathan Subrahmanya ,  Hyukjun Oh

IPC: H04B7/005 ,  H04L1/20 ,  H04B7/212

CPC classification number: H04W52/04 ,  H04L1/20 ,  H04L1/201 ,  H04W52/12 ,  H04W52/16 ,  H04W52/20 ,  H04W52/287 ,  H04W52/362 ,  H04W52/44

Abstract: Erasure detection and power control are performed for an intermittently active transport channel with unknown format. A receiver processes each received block and determines whether it passes or fails CRC. For each received block with CRC failure, the receiver performs erasure detection by computing a symbol error rate (SER) and energy of the received block, comparing the computed SER against an SER threshold, comparing the computed energy against an energy threshold, and declaring an erasure if the computed SER is less than the SER threshold and the computed energy exceeds the energy threshold. The SER and energy thresholds may be adjusted based on the average SER and the average energy for prior received blocks with CRC failures. For power control, an SIR target is increased by an UP step whenever an erased block is detected for the transport channel.

Abstract translation: 对具有未知格式的间歇活动的传输信道执行擦除检测和功率控制。 接收器处理每个接收的块并确定其是否通过或失败CRC。 对于每个具有CRC故障的接收块，接收机通过计算接收块的符号错误率（SER）和能量来执行擦除检测，将计算的SER与SER阈值进行比较，将计算出的能量与能量阈值进行比较，并且声明 如果计算的SER小于SER阈值并且计算的能量超过能量阈值，则擦除。 可以基于具有CRC故障的先前接收的块的平均SER和平均能量来调整SER和能量阈值。 对于功率控制，每当检测到用于传输信道的擦除块时，SIR目标通过UP步增加。

公开(公告)号：US08744383B2

公开(公告)日：2014-06-03

申请号：US13080725

申请日：2011-04-06

Applicant: Parvathanathan Subrahmanya ,  Nitin Kasturi

Inventor： Parvathanathan Subrahmanya ,  Nitin Kasturi

IPC: H04B1/02 ,  H04B7/00

CPC classification number: H01Q1/245 ,  H04B1/3838 ,  H04W52/247 ,  H04W52/283 ,  H04W52/288 ,  H04W52/367

Abstract: Methods and apparatus for active and passive dynamic electromagnetic radiation emission control in wireless devices by limiting transmit power in individual devices is disclosed. In various embodiments, electromagnetic radiation emissions from wireless devices are dynamically controlled using variable transmit power limits acquired through the use of RF ID/NFC tags that indicate transmit power limits, where such power limiting tags are embedded in clothing, furniture, etc., communication of transmit power limits over Bluetooth or other short range technologies, location-based transmit power limits, user input transmit power limits. Controlling the transmit power of mobiles as well as femtocells/access points for the purpose of minimizing SAR using variable transmit power limits is detailed.

Abstract translation: 公开了通过限制各个设备中的发射功率的无线设备中的主动和被动动态电磁辐射发射控制的方法和装置。 在各种实施例中，使用通过使用指示发射功率限制的RF ID / NFC标签获得的可变发射功率限制来动态地控制来自无线设备的电磁辐射发射，其中这种功率限制标签嵌入在服装，家具等中，通信 通过蓝牙或其他短距离技术的发射功率限制，基于位置的发射功率限制，用户输入发射功率限制。 详细说明了控制移动台以及毫微微蜂窝/接入点的发射功率，以便使用可变发射功率限制来最小化SAR。

公开(公告)号：US08620357B2

公开(公告)日：2013-12-31

申请号：US13331034

申请日：2011-12-20

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: H04W68/02

CPC classification number: H04W68/00 ,  H04W52/0216 ,  Y02D70/00

Abstract: A wireless communications network (120) responds to each incoming call placed to a wireless communications device (134) by transmitting a call-paging message (418) within a corresponding partition of a digital radio frame of prescribed format. Responsive to each occurrence of a broadcast event (404), the network transmits (414) a repeating broadcast-paging message announcing the availability of broadcast content from the network. The broadcast-paging message is transmitted multiple times within each digital radio frame. Another sequence (500) describes WCD operation in this network. Responsive to wakeup (502) from sleep, the WCD detects (509) received signal quality. The WCD also receives (510) scheduled network transmission of a call-paging message and a number of instances (at least one) of a repeating network transmitted broadcast-paging message that occurs multiple times for each scheduled transmission of the call-paging message. This number varies inversely with the detected signal quality.

公开(公告)号：US08477888B2

公开(公告)日：2013-07-02

申请号：US12145322

申请日：2008-06-24

Applicant: Feng Lu ,  Prashant Udupa Sripathi ,  Liang Zhao ,  Parvathanathan Subrahmanya ,  Subramanya P. Rao

Inventor： Feng Lu ,  Prashant Udupa Sripathi ,  Liang Zhao ,  Parvathanathan Subrahmanya ,  Subramanya P. Rao

IPC: H03D1/04

CPC classification number: H04W52/245 ,  H04B17/345 ,  H04L1/0026 ,  H04L1/20 ,  H04W52/241 ,  H04W52/243

Abstract: System(s) and method(s) are provided for generating phase-noise resilient channel quality indicator(s). A pilot signal utilized to determine a channel quality indicator is rotated to be aligned to a phase reference signal. Separate noise evaluations in quadrature and in-phase directions are utilized, at least in part, to generate a net noise estimate that is phase-noise compensated or resilient. For example, various combination schemes of quadrature and in-phase noise evaluations can be exploited to generate a net noise estimate, the schemes include weighted average of in-phase and quadrature noise estimates and running averages thereof. Simulation of net noise estimates as a function of geometry conditions reveal that the combination schemes provide substantive mitigation of phase-noise, thus making CQI generation phase-noise resilient.

Abstract translation: 提供了用于产生相位噪声弹性信道质量指示符的系统和方法。 用于确定信道质量指示符的导频信号被旋转以与相位参考信号对准。 至少部分地利用正交和同相方向上的独立噪声评估来产生相位噪声补偿或弹性的净噪声估计。 例如，可以利用正交和同相噪声评估的各种组合方案来产生净噪声估计，该方案包括同相和正交噪声估计的加权平均值及其运行平均值。 作为几何条件的函数的净噪声估计的模拟表明，组合方案提供了相位噪声的实质性减轻，从而使得CQI生成相位噪声具有弹性。

公开(公告)号：US08477742B2

公开(公告)日：2013-07-02

申请号：US12772792

申请日：2010-05-03

Applicant: Francesco Grilli ,  Charles E. Wheatley, III ,  Serge Willenegger ,  Parvathanathan Subrahmanya

Inventor： Francesco Grilli ,  Charles E. Wheatley, III ,  Serge Willenegger ,  Parvathanathan Subrahmanya

IPC: H04W56/00

CPC classification number: H04W56/002 ,  H04B7/2668 ,  H04B2201/70702 ,  H04W56/001 ,  H04W56/0015 ,  H04W56/0045 ,  H04W92/20

Abstract: 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).

公开(公告)号：US20120257657A1

公开(公告)日：2012-10-11

申请号：US13080725

申请日：2011-04-06

Applicant: Parvathanathan Subrahmanya ,  Nitin Kasturi

Inventor： Parvathanathan Subrahmanya ,  Nitin Kasturi

IPC: H04W24/00 ,  H04B1/38

CPC classification number: H01Q1/245 ,  H04B1/3838 ,  H04W52/247 ,  H04W52/283 ,  H04W52/288 ,  H04W52/367

Abstract: Methods and apparatus for active and passive dynamic electromagnetic radiation emission control in wireless devices by limiting transmit power in individual devices is disclosed. In various embodiments, electromagnetic radiation emissions from wireless devices are dynamically controlled using variable transmit power limits acquired through the use of RF ID/NFC tags that indicate transmit power limits, where such power limiting tags are embedded in clothing, furniture, etc., communication of transmit power limits over Bluetooth or other short range technologies, location-based transmit power limits, user input transmit power limits. Controlling the transmit power of mobiles as well as femtocells/access points for the purpose of minimizing SAR using variable transmit power limits is detailed.

Abstract translation: 公开了通过限制各个设备中的发射功率的无线设备中的主动和被动动态电磁辐射发射控制的方法和装置。 在各种实施例中，使用通过使用指示发射功率限制的RF ID / NFC标签获得的可变发射功率限制来动态地控制来自无线设备的电磁辐射发射，其中这种功率限制标签嵌入在服装，家具等中，通信 通过蓝牙或其他短距离技术的发射功率限制，基于位置的发射功率限制，用户输入发射功率限制。 详细说明了控制移动台以及毫微微蜂窝/接入点的发射功率，以便使用可变发射功率限制来最小化SAR。

公开(公告)号：US20120142276A1

公开(公告)日：2012-06-07

申请号：US12960283

申请日：2010-12-03

Applicant: Young Geun Cho ,  Aditya Dua ,  Feng Lu ,  Gokhan Mergen ,  Subramanya P.N. Rao ,  Abhinav Gupta ,  Parvathanathan Subrahmanya

Inventor： Young Geun Cho ,  Aditya Dua ,  Feng Lu ,  Gokhan Mergen ,  Subramanya P.N. Rao ,  Abhinav Gupta ,  Parvathanathan Subrahmanya

IPC: H04B17/00

CPC classification number: H04L1/20

Abstract: Methods and apparatuses for data aided channel quality estimation using both pilot and data information are disclosed herein. In one exemplary aspect, a method for estimating channel quality in a wireless communication system is disclosed. The method comprises estimating a pilot noise variance based on a pilot signal received from a base station on a downlink and estimating a data noise variance based on a data signal received from the base station on the downlink. The method also comprises combining the pilot noise variance and the data noise variance to obtain a combined noise variance, and estimating the channel quality based on the combined noise variance.

Abstract translation: 本文公开了使用导频和数据信息的数据辅助信道质量估计的方法和装置。 在一个示例性方面，公开了一种用于估计无线通信系统中的信道质量的方法。 该方法包括基于从下行链路上的基站接收的导频信号来估计导频噪声方差，并且基于在下行链路上从基站接收的数据信号来估计数据噪声方差。 该方法还包括组合导频噪声方差和数据噪声方差以获得组合噪声方差，并且基于组合的噪声方差来估计信道质量。

公开(公告)号：US08160128B2

公开(公告)日：2012-04-17

申请号：US12977748

申请日：2010-12-23

Applicant: Gokhan Mergen ,  Parvathanathan Subrahmanya ,  Nitin Kasturi ,  Rajesh Sundaresan

Inventor： Gokhan Mergen ,  Parvathanathan Subrahmanya ,  Nitin Kasturi ,  Rajesh Sundaresan

IPC: H04B1/10

CPC classification number: H04B7/0634 ,  H04B7/0848 ,  H04L7/0058 ,  H04L25/03044

Abstract: Techniques for performing equalization at a receiver are described. In an aspect, equalization is performed by sub-sampling an over-sampled input signal to obtain multiple sub-sampled signals. An over-sampled channel impulse response estimate is derived and sub-sampled to obtain multiple sub-sampled channel impulse response estimates. At least one set of equalizer coefficients is derived based on at least one sub-sampled channel impulse response estimate. At least one sub-sampled signal is filtered with the at least one set of equalizer coefficients to obtain at least one output signal. One sub-sampled signal (e.g., with largest energy) may be selected and equalized based on a set of equalizer coefficients derived from an associated sub-sampled channel impulse response estimate. Alternatively, the multiple sub-sampled signals may be equalized based on multiple sets of equalizer coefficients, which may be derived separately or jointly. The equalizer coefficients may be derived in the time domain or frequency domain.

Abstract translation: 描述用于在接收机处执行均衡的技术。 在一方面，通过对过采样输入信号进行子采样来执行均衡以获得多个子采样信号。 导出过采样信道脉冲响应估计并进行子采样以获得多个子采样信道脉冲响应估计。 基于至少一个子采样信道脉冲响应估计导出至少一组均衡器系数。 用至少一组均衡器系数对至少一个子采样信号进行滤波以获得至少一个输出信号。 可以基于从相关联的子采样信道脉冲响应估计导出的一组均衡器系数来选择和均衡一个子采样信号（例如，具有最大能量）。 或者，可以基于可以单独或联合导出的多组均衡器系数来均衡多个子采样信号。 均衡器系数可以在时域或频域中导出。

公开(公告)号：US20120045024A1

公开(公告)日：2012-02-23

申请号：US13033545

申请日：2011-02-23

Applicant: Tao Cui ,  Jia Tang ,  Andrew Sendonaris ,  Atul A. Salvekar ,  Subramanya P.N. Rao ,  Parvathanathan Subrahmanya ,  Lei Xiao ,  Michael L. McCloud ,  Brian Clarke Banister

Inventor： Tao Cui ,  Jia Tang ,  Andrew Sendonaris ,  Atul A. Salvekar ,  Subramanya P.N. Rao ,  Parvathanathan Subrahmanya ,  Lei Xiao ,  Michael L. McCloud ,  Brian Clarke Banister

IPC: H04L27/06

CPC classification number: H04L1/005 ,  H04L1/06 ,  H04L25/03242 ,  H04L25/067

Abstract: Methods and apparatus for receiving, processing, and decoding MIMO transmissions in communications systems are described. A non-Gaussian approximation method for simplifying processing complexity where summations are used is described. Use of a priori information to facilitate determination of log likelihood ratios (LLRs) in receivers using iterative decoders is further described. A Gaussian or non-Gaussian approximation method using a priori information may be used to determine a K-best list of values for summation to generate an LLR is also described.

Abstract translation: 描述了用于在通信系统中接收，处理和解码MIMO传输的方法和装置。 描述了用于简化使用求和的处理复杂度的非高斯近似方法。 进一步描述使用先验信息以便于使用迭代解码器确定接收机中的对数似然比（LLR）。 也可以使用使用先验信息的高斯或非高斯近似方法来确定用于求和以产生LLR的K个最佳值列表。