公开(公告)号：US20100085913A1

公开(公告)日：2010-04-08

申请号：US12496331

申请日：2009-07-01

申请人： Parvathanathan Subrahmanya

发明人： Parvathanathan Subrahmanya

IPC分类号： H04W4/00 ,  H04B1/00 ,  H04M1/00

CPC分类号： H04J11/0069 ,  H04B1/7075 ,  H04B1/7107 ,  H04B2201/70701 ,  H04J11/005

摘要： Systems and methodologies are described that facilitate acquisition of a cell in the presence of interfering cells. An undesired cell in close proximity to a user equipment unit (UE) can inhibit detection of a desired cell. For instance, a femto cell near the UE can interfere with detection and acquisition of a macro cell. The UE can detect the undesired cell and reconstruct an estimate of signals transmitted by the undesired cell. The estimate can be employed to cancel interference from received signals to facilitate acquisition of a desired cell.

摘要翻译： 描述了在干扰细胞存在下促进细胞获取的系统和方法。 靠近用户设备单元（UE）的不期望的小区可以抑制对期望小区的检测。 例如，UE附近的毫微微小区可以干扰宏小区的检测和获取。 UE可以检测不需要的小区并且重建由不需要的小区发送的信号的估计。 可以采用该估计来消除接收到的信号的干扰，以便于获取期望的小区。

公开(公告)号：US07675962B2

公开(公告)日：2010-03-09

申请号：US11399886

申请日：2006-04-07

申请人： Gokhan Mergen ,  Vignesh Suthuraman ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

发明人： Gokhan Mergen ,  Vignesh Suthuraman ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC分类号： H04B1/00

CPC分类号： H04L25/0216 ,  H04L25/0218

摘要： Techniques for deriving a channel impulse response estimate (CIRE) having improved quality are described. A first CIRE with multiple channel taps is obtained based on (1) an initial CIRE derived from a received pilot or (2) a filtered CIRE derived from the initial CIRE. In one aspect, the channel taps in the first CIRE are scaled with multiple scaling factors to obtain a second CIRE. For point-wise LMMSE scaling, the energy of each channel tap is estimated. The noise energy for the channel taps is also estimated, e.g., based on energies of channel taps on one or both edges of the first CIRE. Each channel tap is scaled based on a scaling factor determined by the energy of that channel tap and the noise energy. Each channel tap with energy below a threshold may be set to zero. In another aspect, the second CIRE is obtained by zeroing out selected ones of the channel taps in the first CIRE.

摘要翻译： 描述了用于导出具有改进的质量的信道脉冲响应估计（CIRE）的技术。 基于（1）从接收到的导频导出的初始CIRE或（2）从初始CIRE导出的滤波CIRE，获得具有多信道抽头的第一CIRE。 在一个方面，第一CIRE中的信道抽头被多个缩放因子缩放以获得第二CIRE。 对于逐点LMMSE缩放，估计每个通道抽头的能量。 也可以例如基于第一CIRE的一个或两个边缘上的信道抽头的能量来估计信道抽头的噪声能量。 每个通道抽头基于由该通道抽头的能量和噪声能量确定的缩放因子进行缩放。 能量低于阈值的每个通道抽头可以设置为零。 在另一方面，第二CIRE是通过对第一CIRE中的选通的信道抽头进行归零而获得的。

公开(公告)号：US20090041162A1

公开(公告)日：2009-02-12

申请号：US11836941

申请日：2007-08-10

申请人： Yan Li ,  Parvathanathan Subrahmanya ,  Naveed Zaman

发明人： Yan Li ,  Parvathanathan Subrahmanya ,  Naveed Zaman

IPC分类号： H04L27/06

CPC分类号： H04B1/7083 ,  H04B1/70735 ,  H04B1/709

摘要： A circuit and algorithm are disclosed for a step2 search of a three step search of synchronization channels in a W-CDMA system. A mobile terminal of the CDMA system includes an RF downconverter for receiving I and Q signals. A searcher, responsive to the I and Q signals, includes a first correlator for correlating the I and Q signals with a primary synchronization code on a primary synchronization channel, and a second correlator for correlating I and Q signals with a secondary synchronization code on a secondary synchronization channel. The correlated I and Q signals are added for each of the secondary synchronization codes. An energy calculator and a maximum energy detector use the correlated I and Q signals of both the primary and secondary synchronization channels to detect the most likely scrambling code group of secondary synchronization codes.

摘要翻译： 公开了一种针对W-CDMA系统中的同步信道的三步搜索的步骤2搜索的电路和算法。 CDMA系统的移动终端包括用于接收I和Q信号的RF下变频器。 响应于I和Q信号的搜索器包括用于将I信号与Q信号与主同步信道上的主同步码进行相关的第一相关器，以及用于使I和Q信号与第一同步码相关的第二相关器， 辅同步通道。 为每个辅助同步码添加相关的I和Q信号。 能量计算器和最大能量检测器使用主和次同步信道的相关I和Q信号来检测次同步码的最可能的扰码组。

公开(公告)号：US07363010B2

公开(公告)日：2008-04-22

申请号：US10827143

申请日：2004-04-15

申请人： Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi

发明人： Hyukjun Oh ,  Parvathanathan Subrahmanya ,  Nitin Kasturi

IPC分类号： H04B17/00

CPC分类号： H04W52/12 ,  H04W52/28

摘要： 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.

摘要翻译： 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，接收到的块能量等等），并被认为是休眠或不休眠（例如，基于从活动以来的经过时间量 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：US20070127557A1

公开(公告)日：2007-06-07

申请号：US11502178

申请日：2006-08-09

申请人： Parvathanathan Subrahmanya ,  Inyup Kang ,  Jia Fei ,  Rajesh Sundaresan

发明人： Parvathanathan Subrahmanya ,  Inyup Kang ,  Jia Fei ,  Rajesh Sundaresan

IPC分类号： H04B1/00 ,  H03H7/30

CPC分类号： H04B1/71057 ,  H04B7/0669 ,  H04B7/0673 ,  H04B7/0845 ,  H04L25/03044 ,  H04L25/03292 ,  H04L2025/03509

摘要： This disclosure describes equalization techniques for spread spectrum wireless communication. The techniques may involve estimating a channel impulse response, estimating channel variance, and selecting filter coefficients for an equalizer based on the estimated channel impulse response and the estimated channel variance. Moreover, in accordance with this disclosure, the channel variance estimation involves estimation of two or more co-variances for different received samples. Importantly, the equalizer is “fractionally spaced,” which means that the equalizer defines fractional filtering coefficients (filter taps), unlike conventional equalizers that presume that filter coefficients are defined at integer chip spacing. The techniques can allow the equalizer to account for antenna diversity, such as receive diversity, transmit diversity, or possibly both.

摘要翻译： 本公开描述了用于扩频无线通信的均衡技术。 这些技术可以包括基于所估计的信道脉冲响应和所估计的信道方差估计信道脉冲响应，估计信道方差，以及为均衡器选择滤波器系数。 此外，根据本公开，信道方差估计涉及对于不同接收样本的两个或多个协方差的估计。 重要的是，均衡器是“分数间隔”的，这意味着均衡器定义了分数滤波系数（滤波器抽头），不同于传统的均衡器，假设滤波器系数是以整数芯片间隔定义的。 这些技术可以允许均衡器考虑天线分集，例如接收分集，发射分集，或者可能两者。

公开(公告)号：US20060174179A1

公开(公告)日：2006-08-03

申请号：US11049991

申请日：2005-02-02

申请人： Arun Visvanathan ,  Amit Butala ,  Parvathanathan Subrahmanya

发明人： Arun Visvanathan ,  Amit Butala ,  Parvathanathan Subrahmanya

IPC分类号： H03M13/00

CPC分类号： H04W52/12 ,  H04B1/7172 ,  H04L1/20 ,  H04L1/201 ,  H04L1/208 ,  H04W52/18 ,  H04W52/20 ,  H04W52/24 ,  H04W52/44

摘要： 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.

摘要翻译： 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：US06760573B2

公开(公告)日：2004-07-06

申请号：US10261976

申请日：2002-10-01

申请人： Parvathanathan Subrahmanya ,  Jeremy H. Lin

发明人： Parvathanathan Subrahmanya ,  Jeremy H. Lin

IPC分类号： H04B118

CPC分类号： H04B1/712

摘要： 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：US08576965B2

公开(公告)日：2013-11-05

申请号：US12831462

申请日：2010-07-07

申请人： Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

发明人： Madihally J. Narasimha ,  Je Woo Kim ,  Nitin Kasturi ,  Parvathanathan Subrahmanya

IPC分类号： H04B1/10

CPC分类号： H04B1/525 ,  G01S19/21 ,  H04B1/3805 ,  H04B1/406

摘要： Certain embodiments of the present disclosure support techniques for interference cancellation in a multi-mode wireless modem that supports coexistence of different radio technologies.

摘要翻译： 本公开的某些实施例支持支持不同无线电技术共存的多模式无线调制解调器中的干扰消除技术。

公开(公告)号：US08554151B2

公开(公告)日：2013-10-08

申请号：US12960283

申请日：2010-12-03

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

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

IPC分类号： H04B17/00

CPC分类号： H04L1/20

摘要： 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.

摘要翻译： 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

申请人： Parvathanathan Subrahmanya

发明人： Parvathanathan Subrahmanya

IPC分类号： H04W68/00

CPC分类号： H04W68/00 ,  H04W52/0216 ,  Y02D70/00

摘要： 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.

摘要翻译： 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。