公开(公告)号：US07454209B2

公开(公告)日：2008-11-18

申请号：US10632411

申请日：2003-08-01

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: H04Q7/20 ,  H04B1/00 ,  H04B1/10

CPC classification number: H04L25/0214 ,  H04B1/7115 ,  H04B2201/70701 ,  H04L25/0228

Abstract: A method and apparatus are provided for adapting a pilot filter based on the velocity of a wireless communication device (WCD) in relation to a wireless network infrastructure. The pilot filter is adapted by determining pilot coefficients for the pilot filter based on the WCD velocity. The pilot filter may be located in the WCD, or in the network infrastructure, or in both.

Abstract translation: 提供了一种用于根据无线通信设备（WCD）相对于无线网络基础设施的速度来适配导频滤波器的方法和装置。 通过基于WCD速度确定导频滤波器的导频系数来适配导频滤波器。 导频滤波器可以位于WCD中，或者位于网络基础设施中，或两者中。

公开(公告)号：US07230975B2

公开(公告)日：2007-06-12

申请号：US09924199

申请日：2001-08-07

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

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

IPC: H04B1/00 ,  H04B1/10

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：US07035343B2

公开(公告)日：2006-04-25

申请号：US10061877

申请日：2002-01-31

Applicant: Richard Chi ,  Jittra Jootar ,  Parvathanathan Subrahmanya

Inventor： Richard Chi ,  Jittra Jootar ,  Parvathanathan Subrahmanya

IPC: H04L5/12

CPC classification number: H04L1/0054 ,  H04B7/0634 ,  H04B7/0654 ,  H04L1/0055 ,  H04L1/06

Abstract: A trellis decoder determines the most likely transmitted phase in response to previously requested phase adjustments and observed transmitted symbols. Maximum a posteriori (MAP) decoding also may be used. Alternatively, the identified likely transmitted phase is used for data demodulation. This and related features have the benefit of decreasing the effect of phase discrepancies introduced by erroneous reception of phase adjustment information, resulting in improved error rates, and a corresponding increase in system capacity, data throughput, or both.

Abstract translation: 网格解码器响应于先前请求的相位调整和观察到的发送符号来确定最可能的传输阶段。 也可以使用最大后验（MAP）解码。 或者，所识别的可能发射的相位用于数据解调。 这个和相关的特征具有减少由相位调整信息的错误接收引起的相位差异的影响的优点，导致改进的误码率，以及系统容量，数据吞吐量或两者的相应增加。

公开(公告)号：US20060040698A1

公开(公告)日：2006-02-23

申请号：US11249786

申请日：2005-10-12

Applicant: Da-shan Shiu ,  Serge Willenegger ,  Richard Chi ,  Parvathanathan Subrahmanya ,  Chih-Ping Hsu

Inventor： Da-shan Shiu ,  Serge Willenegger ,  Richard Chi ,  Parvathanathan Subrahmanya ,  Chih-Ping Hsu

IPC: H04B7/00

CPC classification number: H04W52/12 ,  H04W52/20 ,  H04W52/267 ,  H04W52/283 ,  H04W52/286 ,  H04W52/44

Abstract: Techniques to more efficiently control the transmit power for a data transmission that uses a number of formats (e.g., rates, transport formats). Different formats for a given data channel (e.g., transport channel) may require different target SNIRs to achieved a particular BLER. In one aspect, individual target BLER may be specified- for each format of each data channel. In another aspect, various power control schemes are provided to achieve different target SNIRs for different formats. In a first power control scheme, multiple individual outer loops are maintained for multiple formats. For each format, its associated outer loop attempts to set the target SNIR such that the target BLER specified for that format is achieved. In a second power control scheme, multiple individual outer loops are maintained and the base station further applies different adjustments to the transmit power levels for different formats.

Abstract translation: 用于更有效地控制使用多种格式（例如，速率，传输格式）的数据传输的发射功率的技术。 给定数据信道（例如，传输信道）的不同格式可能需要不同的目标SNIR来实现特定的BLER。 在一个方面，可以针对每个数据信道的每个格式指定单个目标BLER。 在另一方面，提供各种功率控制方案以实现用于不同格式的不同目标SNIR。 在第一功率控制方案中，为多种格式维护多个单独的外环。 对于每个格式，其关联的外部循环尝试设置目标SNIR，使得为该格式指定的目标BLER被实现。 在第二功率控制方案中，保持多个单独的外环，并且基站进一步对不同格式的发射功率电平进行不同的调整。

公开(公告)号：US06983166B2

公开(公告)日：2006-01-03

申请号：US09933604

申请日：2001-08-20

Applicant: Da-shan Shiu ,  Serge Willenegger ,  Richard Chi ,  Parvathanathan Subrahmanya ,  Chih-Ping Hsu

Inventor： Da-shan Shiu ,  Serge Willenegger ,  Richard Chi ,  Parvathanathan Subrahmanya ,  Chih-Ping Hsu

IPC: H04Q7/20

CPC classification number: H04W52/12 ,  H04W52/20 ,  H04W52/267 ,  H04W52/283 ,  H04W52/286 ,  H04W52/44

Abstract: Techniques to more efficiently control the transmit power for a data transmission that uses a number of formats (e.g., rates, transport formats). Different formats for a given data channel (e.g., transport channel) may require different target SNIRs to achieved a particular BLER. In one aspect, individual target BLER may be specified for each format of each data channel. In another aspect, various power control schemes are provided to achieve different target SNIRs for different formats. In a first power control scheme, multiple individual outer loops are maintained for multiple formats. For each format, its associated outer loop attempts to set the target SNIR such that the target BLER specified for that format is achieved. In a second power control scheme, multiple individual outer loops are maintained and the base station further applies different adjustments to the transmit power levels for different formats.

公开(公告)号：US20050239409A1

公开(公告)日：2005-10-27

申请号：US10827143

申请日：2004-04-15

Applicant: Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi

Inventor： Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi

IPC: H04B7/005 ,  H04Q7/20

CPC classification number: H04W52/12 ,  H04W52/28

Abstract: Techniques for controlling transmit power for a data transmission sent on multiple data channels, which may be intermittently active, are described. Each data channel is monitored for activity (e.g., based on an error correction code, received signaling information, received block energy, and so on) and deemed to be dormant or not dormant (e.g., based on the amount of elapsed time since activity was last detected on the data channel). A signal quality (SIR) target may be maintained for each non-dormant data channel and updated based on the status of received data blocks for the data channel. A final SIR target, used for power control of the data transmission, may be set to the highest SIR target among the SIR targets for the non-dormant data channels. The final SIR target may also be updated directly based on the status of received data blocks for the non-dormant data channels.

Abstract translation: 描述了用于控制在可能间歇地活动的多个数据信道上发送的数据传输的发送功率的技术。 监视每个数据信道的活动（例如，基于纠错码，接收的信令信息，接收的块能量等等）并被认为是休眠或不休眠（例如，基于从活动以来经过的时间量 最后在数据通道上检测到）。 可以为每个非休眠数据信道维持信号质量（SIR）目标，并且基于数据信道的接收数据块的状态来更新。 可以将用于数据传输的功率控制的最终SIR目标设置为非休眠数据信道的SIR目标中的最高SIR目标。 也可以基于非休眠数据信道的接收数据块的状态来直接更新最终SIR目标。

公开(公告)号：US20050153714A1

公开(公告)日：2005-07-14

申请号：US10756160

申请日：2004-01-12

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: H04W4/00 ,  H04W52/02 ,  H04W68/00 ,  H04Q7/20 ,  H04B7/00

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.

Abstract translation: 无线通信网络（120）通过在规定格式的数字无线电帧的相应分区内发送呼叫寻呼消息（418）来响应放置到无线通信设备（134）的每个呼入呼叫。 响应于广播事件的每次发生（404），网络发送（414）重播广播 - 寻呼消息，通知广播内容的可用性。 在每个数字无线电帧内广播 - 寻呼消息被多次发送。 另一个序列（500）描述了该网络中的WCD操作。 响应唤醒（502）从睡眠，WCD检测（509）接收信号质量。 WCD还接收（510）呼叫寻呼消息的调度网络传输和针对呼叫寻呼消息的每个调度传输多次发生的重复网络发送的广播寻呼消息的多个实例（至少一个）。 该数字与检测到的信号质量成反比。

公开(公告)号：US06807429B2

公开(公告)日：2004-10-19

申请号：US09935525

申请日：2001-08-22

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: H04Q720

CPC classification number: H04W52/40

Abstract: Techniques to combine soft-decision power control symbols received for multiple active base stations. In one method, a received signal is initially processed to derive soft-decision (multi-bit valued) symbols for power control commands transmitted from a number of base stations. Each soft-decision symbol for each base station is then scaled based on a scaling factor associated with the base station and which is related to the received signal quality for the power control symbols for the base station. The scaling allows power control symbols for more reliably received base stations to be given greater weights. The scaled soft-decision symbols for each power control period are then combined to provide a decision metric for the period. Each decision metric is then compared against a particular threshold, and a power control decision is derived for each decision metric based on the result of the comparison.

Abstract translation: 组合为多个活动基站接收的软判决功率控制符号的技术。 在一种方法中，首先处理接收信号以导出从多个基站发送的功率控制命令的软判决（多位值）符号。 然后基于与基站相关联的缩放因子对每个基站的每个软判决符号进行缩放，并且与基站的功率控制符号的接收信号质量相关。 缩放允许给予更可靠接收的基站的功率控制符号更大的权重。 然后将每个功率控制周期的缩放的软判决符号组合以提供该周期的决策度量。 然后将每个决策度量与特定阈值进行比较，并且基于比较的结果为每个决策度量导出功率控制决策。

公开(公告)号：US06771692B2

公开(公告)日：2004-08-03

申请号：US09964589

申请日：2001-09-25

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

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

IPC: H04B1707

CPC classification number: H04B1/7085 ,  H04B1/7115 ,  H04B7/0667 ,  H04B7/0697 ,  H04B2201/70701

Abstract: 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：US06744747B2

公开(公告)日：2004-06-01

申请号：US09935505

申请日：2001-08-22

Applicant: Da-Shan Shiu ,  Parvathanathan Subrahmanya ,  Subramanya P.N. Rao

Inventor： Da-Shan Shiu ,  Parvathanathan Subrahmanya ,  Subramanya P.N. Rao

IPC: H04Q700

CPC classification number: H04B1/7083 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04W36/00 ,  H04W48/16 ,  Y02D70/40

Abstract: Techniques for improved handoff searching in asynchronous systems, such as W-CDMA, are disclosed. In one aspect, a two-step search procedure is used when a list of neighbor codes is known. In the first step, a received signal is correlated with a slot timing code to locate on or more pilots and the slot boundaries associated therewith. In the second step, the received signal is correlated with each of the list of codes at the slot boundaries identified with pilots in the first step to identify the pilot code and the frame timing associated with each pilot. Various other aspects of the invention are also presented. These aspects have the benefit of decreasing search time, which translates to increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.

Abstract translation: 公开了用于在诸如W-CDMA之类的异步系统中改进切换搜索的技术。 在一个方面，当已知邻居码列表时，使用两步搜索过程。 在第一步骤中，接收的信号与时隙定时码相关联，以定位或多于其上的导频和与其相关联的时隙边界。 在第二步骤中，接收到的信号与在第一步骤中用导频识别的时隙边界上的每个代码列表相关联，以识别与每个导频相关联的导频码和帧定时。 还提出了本发明的各种其它方面。 这些方面具有减少搜索时间的优点，这意味着增加的采集速度，更高质量的信号传输，增加的数据吞吐量，降低的功率以及整体系统容量的提高。