公开(公告)号：US20060174179A1

公开(公告)日：2006-08-03

申请号：US11049991

申请日：2005-02-02

Applicant: Arun Visvanathan ,  Amit Butala ,  Parvathanathan Subrahmanya

Inventor： Arun Visvanathan ,  Amit Butala ,  Parvathanathan Subrahmanya

IPC: H03M13/00

CPC classification number: H04W52/12 ,  H04B1/7172 ,  H04L1/20 ,  H04L1/201 ,  H04L1/208 ,  H04W52/18 ,  H04W52/20 ,  H04W52/24 ,  H04W52/44

Abstract: To perform erasure detection for an intermittently active transport channel with unknown format, a receiver determines an energy metric and a symbol error rate (SER) for a received block with CRC failure. The receiver computes uncorrelated random variables u and v for the received block based on the energy metric and SER, the estimated means and standard deviations of the energy metric and SER, and a correlation coefficient indicative of the correlation between the energy metric and SER. The receiver then evaluates the uncorrelated random variables u and v based on at least one decision criterion and declares the received block to be an erased block or a DTX block based on the result of the evaluation. The decision criterion may be defined based on a target probability of false alarm and adjusted based on another metric, such as a zero state bit, for the received block.

Abstract translation: 为了对具有未知格式的间歇活动传输信道执行擦除检测，接收机确定具有CRC故障的接收块的能量度量和符号错误率（SER）。 接收机基于能量度量和SER，能量度量和SER的估计平均值和标准偏差以及表示能量度量与SER之间的相关性的相关系数，计算接收块的不相关随机变量u和v。 然后，接收机基于至少一个决策标准来评估不相关的随机变量u和v，并且基于评估结果将接收到的块声明为擦除块或DTX块。 可以基于目标误报率概率来定义判定标准，并且基于接收块的另一个度量（例如零状态位）进行调整。

公开(公告)号：US20050079846A1

公开(公告)日：2005-04-14

申请号：US10684771

申请日：2003-10-14

Applicant: Andrew Sendonaris ,  Da-shan Shiu ,  Dominic Farmer ,  Jeremy Lin ,  Parvathanathan Subrahmanya ,  Thomas Rowland

Inventor： Andrew Sendonaris ,  Da-shan Shiu ,  Dominic Farmer ,  Jeremy Lin ,  Parvathanathan Subrahmanya ,  Thomas Rowland

IPC: G01S19/25 ,  G01S19/23 ,  H04B1/38 ,  H04L27/00 ,  H04B1/06 ,  H04L7/04

CPC classification number: H04L27/0014 ,  G01S19/235 ,  H04B1/3805 ,  H04L2027/0077

Abstract: Systems and techniques are disclosed relating to wireless communications. These systems and techniques involve wireless communications wherein a device may be configured to recover an information signal from a carrier using a reference signal, detect a frequency error in the information signal; and periodically tune the reference signal to reduce the frequency error.

Abstract translation: 公开了与无线通信有关的系统和技术。 这些系统和技术涉及无线通信，其中设备可以被配置为使用参考信号从载波恢复信息信号，检测信息信号中的频率误差; 并定期调谐参考信号以减少频率误差。

公开(公告)号：US06775242B2

公开(公告)日：2004-08-10

申请号：US09901831

申请日：2001-07-09

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

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

IPC: G01R3108

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).

Abstract translation: 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：US06760573B2

公开(公告)日：2004-07-06

申请号：US10261976

申请日：2002-10-01

Applicant: Parvathanathan Subrahmanya ,  Jeremy H. Lin

Inventor： Parvathanathan Subrahmanya ,  Jeremy H. Lin

IPC: H04B118

CPC classification number: H04B1/712

Abstract: Techniques for inner/outer loop tracking that is stable and provides desirable loop convergence characteristics are disclosed. In one aspect, the contribution from any one inner loop to the tracking function of the outer loop is limited, to prohibit any one received signal component from dominating the outer loop. In another aspect, the rate of outer loop tracking variation is controlled to provide inner and outer loop stability. Various other aspects are also presented. These aspects have the benefit of providing stable inner and outer loop control, as well as efficient convergence and tracking by the various loops, resulting in reduced frequency error and improved communication performance.

公开(公告)号：US08554151B2

公开(公告)日：2013-10-08

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：US08155676B2

公开(公告)日：2012-04-10

申请号：US12717891

申请日：2010-03-04

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: H04W68/00

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：US08027373B2

公开(公告)日：2011-09-27

申请号：US11228045

申请日：2005-09-15

Applicant: Parvathanathan Subrahmanya ,  Thejaswi Bharadwaj Madapushi Sheshadri ,  Vivek Chawla

Inventor： Parvathanathan Subrahmanya ,  Thejaswi Bharadwaj Madapushi Sheshadri ,  Vivek Chawla

IPC: H04B1/00

CPC classification number: H04L27/2278 ,  H04B1/7085 ,  H04B2201/70709 ,  H04L2027/003 ,  H04L2027/0034 ,  H04L2027/0065 ,  H04W52/0229 ,  Y02D70/122 ,  Y02D70/1242 ,  Y02D70/166 ,  Y02D70/24 ,  Y02D70/40

Abstract: Quick frequency tracking (QFT), quick time tracking (QTT), and non-causal pilot filtering (NCP) are used to detect sporadically transmitted signaling, e.g., paging indicators. For QFT, multiple hypothesized frequency errors are applied to an input signal to obtain multiple rotated signals. The energies of the rotated signals are computed. The hypothesized frequency error with the largest energy is provided as a frequency error estimate. For QTT, coherent accumulation is performed on the input signal for a first set of time offsets, e.g., early, on-time, and late. Interpolation, energy computation, and non-coherent accumulation are then performed to obtain a timing error estimate with higher time resolution. For NCP, pilot symbols are filtered with a non-causal filter to obtain pilot estimates for one antenna for non-STTD and for two antennas for STTD. The frequency and timing error estimates and the pilot estimates are used to detect the signaling.

Abstract translation: 使用快速频率跟踪（QFT），快速时间跟踪（QTT）和非因果导频滤波（NCP）来检测偶发地发送的信令，例如寻呼指示符。 对于QFT，将多个假设频率误差应用于输入信号以获得多个旋转信号。 计算旋转信号的能量。 提供具有最大能量的假设频率误差作为频率误差估计。 对于QTT，对于第一组时间偏移的输入信号执行相干累加，例如早，时，晚。 然后执行插值，能量计算和非相干累加，以获得具有更高时间分辨率的定时误差估计。 对于NCP，使用非因果滤波器对导频符号进行滤波，以获得用于非STTD的一个天线和用于STTD的两个天线的导频估计。 频率和定时误差估计和导频估计用于检测信令。

公开(公告)号：US20110051860A1

公开(公告)日：2011-03-03

申请号：US12563655

申请日：2009-09-21

Applicant: Jia Tang ,  Atul A. Salvekar ,  Parvathanathan Subrahmanya ,  Andrew Sendonaris ,  Shantanu Khare ,  Jong Hyeon Park ,  Brian C. Banister ,  Tao Cui

Inventor： Jia Tang ,  Atul A. Salvekar ,  Parvathanathan Subrahmanya ,  Andrew Sendonaris ,  Shantanu Khare ,  Jong Hyeon Park ,  Brian C. Banister ,  Tao Cui

IPC: H04L27/06

CPC classification number: H04L1/005 ,  H04L1/06 ,  H04L1/1812 ,  H04L1/1829 ,  H04L25/0204 ,  H04L25/023 ,  H04L25/0244

Abstract: Certain aspects of the present disclosure relate to a method for iterative decoding with re-transmissions of data and to a method for iterative decoding with soft decision directed channel estimation.

Abstract translation: 本公开的某些方面涉及用于重新传输数据的迭代解码的方法以及用于通过软判决定向信道估计进行迭代解码的方法。

公开(公告)号：US20100184455A1

公开(公告)日：2010-07-22

申请号：US12717891

申请日：2010-03-04

Applicant: Parvathanathan Subrahmanya

Inventor： Parvathanathan Subrahmanya

IPC: H04W68/02 ,  H04W52/02 ,  H04W88/12

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：US07693241B2

公开(公告)日：2010-04-06

申请号：US11392316

申请日：2006-03-28

Applicant: Thejaswi Bharadwaj Madapushi Sheshadri ,  Brian Dong ,  Messay Amerga ,  Chih-Ping Hsu ,  Parvathanathan Subrahmanya ,  Xiaoming Zhu

Inventor： Thejaswi Bharadwaj Madapushi Sheshadri ,  Brian Dong ,  Messay Amerga ,  Chih-Ping Hsu ,  Parvathanathan Subrahmanya ,  Xiaoming Zhu

IPC: H04L1/00 ,  H04B1/69 ,  H04B7/216

CPC classification number: H04B1/7117 ,  B60L2200/26

Abstract: A rake receiver finger assignor is configured to assign a rake receiver finger to a time offset between identified signal path time offsets in accordance with a concentration of identified signal paths from a transmitter to a rake receiver. In accordance with the exemplary embodiment, a number of identified signal paths having time offsets within a time window are observed to determine the concentration of signal paths identified by a path searcher. If the number of identified signal paths indicates a concentrated distribution of signal paths such as during a fat path condition, at least one rake finger is assigned between at a time offset between two identified signal paths.

Abstract translation: 耙式接收器手指分配器被配置为根据从发射机到耙式接收机的识别的信号路径的浓度，将耙机接收机手指分配到所识别的信号路径时间偏移之间的时间偏移。 根据示例性实施例，观察到在时间窗内具有时间偏移的多个识别的信号路径，以确定由路径搜索器识别的信号路径的浓度。 如果所识别的信号路径的数量表示信号路径的集中分布，例如在脂肪路径条件期间，则在两个识别的信号路径之间的时间偏移处分配至少一个耙指。