公开(公告)号：US20100067396A1

公开(公告)日：2010-03-18

申请号：US12552206

申请日：2009-09-01

Applicant: Tao Cui ,  Feng Lu ,  Anil Kumar Goteti ,  Vignesh Sethuraman ,  Subramanya P. Rao ,  Parvathanathan Subrahmanya

Inventor： Tao Cui ,  Feng Lu ,  Anil Kumar Goteti ,  Vignesh Sethuraman ,  Subramanya P. Rao ,  Parvathanathan Subrahmanya

IPC: H04L12/26

CPC classification number: H04W28/0236 ,  H04L1/0026 ,  H04L1/203 ,  H04W28/0205

Abstract: A method for optimizing throughput in a wireless communication system is disclosed. A target metric is estimated based on previous acknowledgment data. A channel quality indicator offset is determined based on the target metric. A channel quality indicator is adjusted based on the channel quality indicator offset. The channel quality indicator indicates the quality of a wireless transmission channel.

Abstract translation: 公开了一种用于优化无线通信系统中的吞吐量的方法。 基于先前的确认数据来估计目标度量。 基于目标度量确定信道质量指示符偏移量。 基于信道质量指示符偏移量调整信道质量指示符。 信道质量指示符表示无线传输信道的质量。

公开(公告)号：US07664519B2

公开(公告)日：2010-02-16

申请号：US10750302

申请日：2003-12-30

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

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

IPC: H04B1/00 ,  H04B1/04 ,  H04Q7/20

CPC classification number: H04W52/12 ,  H04W52/34 ,  H04W52/36

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20100002614A1

公开(公告)日：2010-01-07

申请号：US12483652

申请日：2009-06-12

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: G08C17/02

CPC classification number: H04W88/08 ,  H04W52/0206 ,  H04W52/244 ,  H04W52/287 ,  H04W52/322 ,  H04W52/325 ,  H04W84/045 ,  Y02D70/1222 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/1264 ,  Y02D70/142 ,  Y02D70/146 ,  Y02D70/164 ,  Y02D70/23

Abstract: Devices and methods are provided for deploying and/or implementing a low power mode in an access point (AP) base station. The low power mode may be implemented based on the presence and/or status of access terminals (ATs). In one embodiment, the method may involve determining whether any ATs are present within at least one defined coverage area. In another embodiment, the method may involve determining whether the ATs are in an idle or active state.

Abstract translation: 提供了用于在接入点（AP）基站中部署和/或实现低功率模式的设备和方法。 低功率模式可以基于接入终端（AT）的存在和/或状态来实现。 在一个实施例中，该方法可以包括确定在至少一个定义的覆盖区域内是否存在任何AT。 在另一个实施例中，该方法可以涉及确定AT是处于空闲还是活动状态。

公开(公告)号：US07430191B2

公开(公告)日：2008-09-30

申请号：US09950744

申请日：2001-09-10

Applicant: Parvathanathan Subrahmanya ,  Andrew Sendonaris

Inventor： Parvathanathan Subrahmanya ,  Andrew Sendonaris

IPC: H04B7/216

CPC classification number: H04L27/2332 ,  H04B2201/70701 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0081 ,  H04L2027/0087

Abstract: Techniques to acquire and track a received signal instance (or multipath) based on one or more transmitted pilots. In an aspect, a frequency tracking loop is provided to acquire and track the multipath, and supports a number of loop modes (e.g., acquisition and tracking modes). Each loop mode may be associated with a respective frequency detector and a set of values for a set of elements in the loop. In another aspect, several frequency detectors are provided for deriving estimates of the frequency error in the downconversion of the multipath (e.g., from radio frequency to baseband). In one design, maximum likelihood estimates of the frequency error are derived based on the recovered pilot symbols. In another design, the frequency error estimates for the multipath are derived based on the frequency error estimated for each transmitted signal.

Abstract translation: 基于一个或多个发射的导频获取和跟踪接收到的信号实例（或多路径）的技术。 在一方面，提供频率跟踪环以获取和跟踪多路径，并且支持多种环路模式（例如，采集和跟踪模式）。 每个循环模式可以与相应的频率检测器和一组循环中的元件的值相关联。 在另一方面，提供了几个频率检测器用于导出多路径下变频（例如，从射频到基带）中的频率误差的估计。 在一种设计中，基于恢复的导频符号导出频率误差的最大似然估计。 在另一种设计中，基于针对每个发射信号估计的频率误差导出多路径的频率误差估计。

公开(公告)号：US20070230544A1

公开(公告)日：2007-10-04

申请号：US11761329

申请日：2007-06-11

Applicant: Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Avneesh Agrawal

Inventor： Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Avneesh Agrawal

IPC: H04B1/00 ,  H04B1/10 ,  H04B1/707

CPC classification number: H04L25/0228 ,  H04B1/7117 ,  H04B2201/70701 ,  H04L25/0214

Abstract: Techniques to filter pilot symbols for a pilot in an “adaptive” manner to provide an improved estimate of the response of a communication channel. A received signal may experience different channel conditions at different times, and different multipaths may also experience different channel conditions even when received close in time. A pilot filter with an adaptive response is used to provide an improved estimate of the channel response. Various adaptive pilot filtering schemes may be used. In a first scheme, the channel conditions are estimated based on the quality of the received pilot. In a second scheme, the channel conditions are estimated based on the quality of the pilot estimates (i.e., the filtered pilot symbols). For each scheme, a particular filter response is selected based on the estimated quality of either the received pilot or the pilot estimates.

Abstract translation: 用于以“自适应”方式滤波导频的导频符号以提供对通信信道的响应的改进估计的技术。 接收到的信号可能在不同时间经历不同的信道条件，即使在接收时间短的情况下，不同的多路径也可能经历不同的信道条件。 使用具有自适应响应的导频滤波器来提供信道响应的改进的估计。 可以使用各种自适应导频滤波方案。 在第一方案中，基于接收到的导频的质量来估计信道条件。 在第二方案中，基于导频估计的质量（即，滤波的导频符号）来估计信道条件。 对于每个方案，基于所接收的导频或导频估计的估计质量来选择特定的滤波器响应。

公开(公告)号：US20070110201A1

公开(公告)日：2007-05-17

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：US20060189342A1

公开(公告)日：2006-08-24

申请号：US11264950

申请日：2005-11-01

Applicant: Richard Chi ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Richard Chi ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04B7/00 ,  H04Q7/20

CPC classification number: H04W52/228 ,  H04W52/12 ,  H04W52/20 ,  H04W52/221 ,  H04W52/24 ,  H04W52/241 ,  H04W52/248 ,  H04W52/36

Abstract: Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.

公开(公告)号：US07010321B2

公开(公告)日：2006-03-07

申请号：US10067608

申请日：2002-02-04

Applicant: Richard Chi ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

Inventor： Richard Chi ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC: H04Q7/20

CPC classification number: H04W52/228 ,  H04W52/12 ,  H04W52/20 ,  H04W52/221 ,  H04W52/24 ,  H04W52/241 ,  H04W52/248 ,  H04W52/36

Abstract: Techniques for power control that avoids outer loop wind-up are disclosed. In one aspect, wind-up of a target power level is detected, and the target power level is modified in response. In another aspect, unwinding of the target power level is detected, after which the target power level is determined without considering wind-up. Various other aspects are also presented, including wind-up and unwinding detection procedures, and target power level modification procedures. These aspects have the benefit of reducing the time that transmit power exceeds that which is necessary, thus increasing system capacity and performance, and mitigating misallocation of system resources.

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。