公开(公告)号：US20100260155A1

公开(公告)日：2010-10-14

申请号：US12772792

申请日：2010-05-03

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

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

IPC分类号： H04W56/00

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：US07702350B2

公开(公告)日：2010-04-20

申请号：US10387973

申请日：2003-03-12

申请人： Hyukjun Oh ,  Luca Blessent ,  Chih-Ping Hsu ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

发明人： Hyukjun Oh ,  Luca Blessent ,  Chih-Ping Hsu ,  Da-Shan Shiu ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC分类号： H04B7/00 ,  H04B1/00 ,  H01Q11/12

CPC分类号： H04W52/362 ,  H04W52/12 ,  H04W52/143 ,  H04W52/24 ,  H04W52/367

摘要： Techniques to quickly adjust an SIR target toward a final value needed to achieve a specified target BLER for a data transmission. The outer loop may be implemented with multiple modes. The SIR target may be maintained fixed in a hold mode, adjusted in large down steps to speed up convergence in an acquisition mode, and adjusted by a small down step and a large up step for good and erased blocks, respectively, in a tracking mode. Various schemes may be used to adjust the SIR target by larger down steps in the acquisition mode. These schemes may be used even if data is transmitted intermittently, the target BLER is set to a low value, and/or one or multiple transport channels are used for data transmission. The SIR target may be boosted by a particular amount upon transitioning from the acquisition mode to the tracking mode.

摘要翻译： 将SIR目标快速调整到实现数据传输的指定目标BLER所需的最终值的技术。 外部环路可以用多种模式来实现。 SIR目标可以在保持模式下保持固定，在大的下降步骤中调整以加速采集模式中的收敛，并且在跟踪模式下分别对于好的和擦除的块分别进行小的向下步长和大的上升步长的调整 。 可以使用各种方案来在采集模式中通过较大的下降步骤来调整SIR目标。 即使间歇地发送数据，目标BLER被设置为低值，和/或一个或多个传输信道用于数据传输，也可以使用这些方案。 在从采集模式转换到跟踪模式时，SIR目标可以被提升特定的量。

公开(公告)号：US20100067396A1

公开(公告)日：2010-03-18

申请号：US12552206

申请日：2009-09-01

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

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

IPC分类号： H04L12/26

CPC分类号： H04W28/0236 ,  H04L1/0026 ,  H04L1/203 ,  H04W28/0205

摘要： 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.

摘要翻译： 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

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

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

IPC分类号： H04B1/00 ,  H04B1/04 ,  H04Q7/20

CPC分类号： H04W52/12 ,  H04W52/34 ,  H04W52/36

摘要： 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.

摘要翻译： 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

申请人： Parvathanathan Subrahmanya

发明人： Parvathanathan Subrahmanya

IPC分类号： G08C17/02

CPC分类号： 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

摘要： 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.

摘要翻译： 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

申请人： Parvathanathan Subrahmanya ,  Andrew Sendonaris

发明人： Parvathanathan Subrahmanya ,  Andrew Sendonaris

IPC分类号： H04B7/216

CPC分类号： H04L27/2332 ,  H04B2201/70701 ,  H04L2027/0055 ,  H04L2027/0065 ,  H04L2027/0081 ,  H04L2027/0087

摘要： 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.

摘要翻译： 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

申请人： Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Avneesh Agrawal

发明人： Parvathanathan Subrahmanya ,  Da-shan Shiu ,  Avneesh Agrawal

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

CPC分类号： H04L25/0228 ,  H04B1/7117 ,  H04B2201/70701 ,  H04L25/0214

摘要： 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.

摘要翻译： 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

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：US20060189342A1

公开(公告)日：2006-08-24

申请号：US11264950

申请日：2005-11-01

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

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

IPC分类号： H04B7/00 ,  H04Q7/20

CPC分类号： H04W52/228 ,  H04W52/12 ,  H04W52/20 ,  H04W52/221 ,  H04W52/24 ,  H04W52/241 ,  H04W52/248 ,  H04W52/36

摘要： 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

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

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

IPC分类号： H04Q7/20

CPC分类号： H04W52/228 ,  H04W52/12 ,  H04W52/20 ,  H04W52/221 ,  H04W52/24 ,  H04W52/241 ,  H04W52/248 ,  H04W52/36

摘要： 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.