专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明申请

WO2007035550A1 FRACTIONALLY-SPACED EQUALIZERS FOR SPREAD SPECTRUM WIRELESS COMMUNICATION 审中-公开
标题翻译：用于传播光谱无线通信的均匀空间均衡器
公开(公告)号：WO2007035550A1
公开(公告)日：2007-03-29
申请号：PCT/US2006/036137
申请日：2006-09-15
申请人： QUALCOMM INCORPORATED , SUBRAHMANYA, Parvathanathan , KANG, Inyup , FEI, Jia , SUNDARESAN, Rajesh
发明人： SUBRAHMANYA, Parvathanathan , KANG, Inyup , FEI, Jia , SUNDARESAN, Rajesh
IPC分类号： H04B1/707 , H04B7/08 , H04L25/03
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。

2. 发明申请

WO2007059517A3 EQUALIZER FOR A RECEIVER IN A WIRELESS COMMUNICATION SYSTEM 审中-公开
公开(公告)号：WO2007059517A3
公开(公告)日：2007-05-24
申请号：PCT/US2006/060947
申请日：2006-11-15
申请人： QUALCOMM INCORPORATED , MERGEN, Gokhan , SUBRAHMANYA, Parvathanathan , KASTURI, Nitin , SUNDARESAN, Rajesh
发明人： MERGEN, Gokhan , SUBRAHMANYA, Parvathanathan , KASTURI, Nitin , SUNDARESAN, Rajesh
IPC分类号： H04L25/03 , H04L7/04 , H04L7/033 , H04B7/06 , H04B7/08
摘要： Techniques for performing equalization at a receiver are described. In an aspect, equalization is performed by sub-sampling an over-sampled input signal to obtain multiple sub-sampled signals. An over-sampled channel impulse response estimate is derived and sub-sampled to obtain multiple sub-sampled channel impulse response estimates. At least one set of equalizer coefficients is derived based on at least one sub-sampled channel impulse response estimate. At least one sub-sampled signal is filtered with the at least one set of equalizer coefficients to obtain at least one output signal. One sub-sampled signal (e.g., with largest energy) may be selected and equalized based on a set of equalizer coefficients derived from an associated sub-sampled channel impulse response estimate. Alternatively, the multiple sub-sampled signals may be equalized based on multiple sets of equalizer coefficients, which may be derived separately or jointly. The equalizer coefficients may be derived in the time domain or frequency domain.

3. 发明申请

WO2010002991A1 LOW POWER MODES FOR FEMTO CELLS 审中-公开
标题翻译：低功率模式用于有限元细胞
公开(公告)号：WO2010002991A1
公开(公告)日：2010-01-07
申请号：PCT/US2009/049404
申请日：2009-07-01
申请人： QUALCOMM INCORPORATED , SUBRAHMANYA, Parvathanathan
发明人： SUBRAHMANYA, Parvathanathan
IPC分类号： H04W52/02
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。

4. 发明申请

WO2007059522A1 METHOD AND APPARATUS FOR FILTERING NOISY ESTIMATES TO REDUCE ESTIMATION ERRORS 审中-公开
标题翻译：用于滤除噪声估计以减少估计误差的方法和装置
公开(公告)号：WO2007059522A1
公开(公告)日：2007-05-24
申请号：PCT/US2006/060952
申请日：2006-11-15
申请人： QUALCOMM Incorporated , MERGEN, Gokhan , SUBRAHMANYA, Parvathanathan , ALILAGHATTA-KANTHARAJ, Vijayaraj , KASTURI, Nitin
发明人： MERGEN, Gokhan , SUBRAHMANYA, Parvathanathan , ALILAGHATTA-KANTHARAJ, Vijayaraj , KASTURI, Nitin
IPC分类号： H04L25/02 , H04L25/03
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。

5. 发明申请

WO2004073207A1 WEIGHT PREDICTION FOR CLOSED-LOOP TRANSMIT DIVERSITY 审中-公开
标题翻译：闭环传输重力的重量预测
公开(公告)号：WO2004073207A1
公开(公告)日：2004-08-26
申请号：PCT/US2004/003903
申请日：2004-02-09
申请人： QUALCOMM INCORPORATED , JOOTAR, Jittra , SHIU, Da-shan , SUBRAHMANYA, Parvathanathan
发明人： JOOTAR, Jittra , SHIU, Da-shan , SUBRAHMANYA, Parvathanathan
IPC分类号： H04B7/06
CPC分类号： H04B7/0634
摘要： Techniques for predicting weights used for closed-loop transmit diversity. In a channel prediction scheme, channel gains for multiple transmit antennas are initially estimated (e.g., based on pilots received from these antennas) and used to derive predicted channel gains for a future time instant. The predicted channel gains are then used to derive predicted weights that are deemed to be "optimal" at the future time instant. Optimality may be determined based on one or more criteria, such as maximizing a received SNR for the received signals. In a weight prediction scheme, the channel gains for the multiple antennas are estimated and used to compute optimal weights for the current time instant. The current optimal weights are then used to predict the optimal weights at the future time instant. For both schemes, the prediction may be performed based on an adaptive filter (e.g., LMS or RLS filter) or a non-adaptive filter.
摘要翻译：用于预测用于闭环发射分集的权重的技术。在信道预测方案中，最初估计多个发射天线的信道增益（例如，基于从这些天线接收的导频），并用于在未来时刻导出预测的信道增益。然后，预测的信道增益用于导出在未来时刻被认为是“最佳”的预测权重。可以基于一个或多个准则来确定最优性，例如为接收到的信号最大化接收到的SNR。在权重预测方案中，估计多个天线的信道增益并用于计算当前时刻的最优权重。然后使用当前的最优权重来预测未来时刻的最优权重。对于这两种方案，可以基于自适应滤波器（例如，LMS或RLS滤波器）或非自适应滤波器来执行预测。

6. 发明申请

WO2010148311A1 APPARATUS AND METHODS FOR LOW POWER SENSING OF WIRELESS ACCESS TECHNOLOGIES 审中-公开
标题翻译：无线接入技术低功率感测装置及方法
公开(公告)号：WO2010148311A1
公开(公告)日：2010-12-23
申请号：PCT/US2010/039182
申请日：2010-06-18
申请人： QUALCOMM INCORPORATED , KRISHNASWAMY, Dilip , KANADE, Parag Mohan , SUBRAHMANYA, Parvathanathan
发明人： KRISHNASWAMY, Dilip , KANADE, Parag Mohan , SUBRAHMANYA, Parvathanathan
IPC分类号： H04W52/02 , H04W48/16 , H04W48/18
CPC分类号： H04W52/028 , H04W48/16 , H04W48/18 , H04W52/0229 , H04W88/06 , Y02D70/122 , Y02D70/1242 , Y02D70/1262 , Y02D70/142 , Y02D70/146
摘要： Apparatus and methods for low power sensing of wireless access technologies are disclosed. In particular, a mobile wireless device, such as an access terminal, may utilize a lower power circuitry portion that operates at a lower power than active circuitry, such as a primary transceiver. The lower power circuitry portion includes a configurable searcher that is capable of sensing if signals of one or more various wireless access technologies are present. When the wireless device utilizes sleep or idle modes for power savings, use of the lower power sensing circuitry to sense the presence of wireless access technologies, rather than using an awoken higher power primary transceiver for sensing, affords increased power savings. An added ability of the lower power circuitry to be put into sleep or idles modes achieves even greater power savings.
摘要翻译：公开了用于无线接入技术的低功率感测的装置和方法。具体地，诸如接入终端的移动无线设备可以利用比诸如主收发器的有源电路低的功率操作的较低功率电路部分。较低功率电路部分包括能够感测是否存在一种或多种各种无线接入技术的信号的可配置搜索器。当无线设备利用睡眠或空闲模式进行功率节省时，使用低功率感测电路来感测无线接入技术的存在，而不是使用唤醒的较高功率的主收发器来进行感测，从而提供更大的功率节省。低功率电路进入睡眠或空闲模式的附加功能实现了更大的功率节省。

7. 发明申请

WO2007059518A1 METHOD AND APPARATUS FOR DERIVING A CHANNEL IMPULSE RESPONSE ESTIMATE FOR A WIRELESS CHANNEL 审中-公开
标题翻译：用于导出无线通道的通道冲击响应估计的方法和装置
公开(公告)号：WO2007059518A1
公开(公告)日：2007-05-24
申请号：PCT/US2006/060948
申请日：2006-11-15
申请人： QUALCOMM INCORPORATED , MERGEN, Gokhan , SETHURAMAN, Vignesh , KASTURI, Nitin , SUBRAHMANYA, Parvathanathan
发明人： MERGEN, Gokhan , SETHURAMAN, Vignesh , KASTURI, Nitin , SUBRAHMANYA, Parvathanathan
IPC分类号： H04L25/02 , H04B1/707
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。

8. 发明申请

WO2007035737A3 QUICK DETECTION OF SIGNALING IN A WIRELESS COMMUNICATION SYSTEM 审中-公开
公开(公告)号：WO2007035737A3
公开(公告)日：2007-03-29
申请号：PCT/US2006/036489
申请日：2006-09-15
申请人： QUALCOMM INCORPORATED , SUBRAHMANYA, Parvathanathan , SHESHADRI, Thejaswi, Bharadwaj, Madapushi , CHAWLA, Vivek
发明人： SUBRAHMANYA, Parvathanathan , SHESHADRI, Thejaswi, Bharadwaj, Madapushi , CHAWLA, Vivek
IPC分类号： H04L27/227
摘要： 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.

9. 发明申请

WO2005125042A1 ERASURE DETECTION AND POWER CONTROL FOR A TRANSPORT CHANNEL WITH UNKNOWN FORMAT IN A WIRELESS COMMUNICATION SYSTEM 审中-公开
标题翻译：在无线通信系统中具有未知格式的传输信道的检测和功率控制
公开(公告)号：WO2005125042A1
公开(公告)日：2005-12-29
申请号：PCT/US2005/019785
申请日：2005-06-06
申请人： QUALCOMM Incorporated , BUTALA, Amit , SUBRAHMANYA, Parvathanathan , OH, Hyukjun
发明人： BUTALA, Amit , SUBRAHMANYA, Parvathanathan , OH, Hyukjun
IPC分类号： H04B7/005
CPC分类号： H04W52/04 , H04L1/20 , H04L1/201 , H04W52/12 , H04W52/16 , H04W52/20 , H04W52/287 , H04W52/362 , H04W52/44
摘要： 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.
摘要翻译：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。

10. 发明申请

WO2004077695A1 RELIABILITY DETERMINATION AND COMBINING OF POWER CONTROL COMMANDS DURING SOFT-HANDOFF 审中-公开
标题翻译：动力控制指令的可靠性确定与组合
公开(公告)号：WO2004077695A1
公开(公告)日：2004-09-10
申请号：PCT/US2004/005544
申请日：2004-02-24
申请人： QUALCOMM INCORPORATED , OH, Hyukjun , SUBRAHMANYA, Parvathanathan , KASTURI, Nitin , AMERGA, Messay , HSU, Chih-Ping , RIDDLE, Christopher , SENDONARIS, Andrew
发明人： OH, Hyukjun , SUBRAHMANYA, Parvathanathan , KASTURI, Nitin , AMERGA, Messay , HSU, Chih-Ping , RIDDLE, Christopher , SENDONARIS, Andrew
IPC分类号： H04B7/005
CPC分类号： H04W52/56 , H04W52/40 , H04W52/58
摘要： The reliability of transmit power control (TPC) commands received from a transmitter is determined based on a TPC target value. The TPC target value is derived based on a TPC threshold and possibly a weight, depending on the receiver implementation. A received TPC command is considered reliable if its absolute value exceeds the TPC target value. Received TPC commands deemed as unreliable are discarded and not used for power control. Multiple TPC target values, used for detecting UP and DOWN commands, may be derived with multiple scaling factors. For a receiver in soft handover and receiving TPC commands from multiple transmitters, a different TPC target value may be derived for each transmitter. The received TPC commands for each transmitter are compared against that transmitter's TPC target value. Received TPC commands deemed as unreliable are discarded and not combined.
摘要翻译：基于TPC目标值确定从发射机接收的发射功率控制（TPC）命令的可靠性。 TPC目标值基于TPC阈值和可能的权重导出，这取决于接收机实现。如果接收到的TPC命令的绝对值超过TPC目标值，则认为它是可靠的。被认为不可靠的TPC命令被丢弃，不用于功率控制。用于检测UP和DOWN命令的多个TPC目标值可以用多个缩放因子导出。对于软切换中的接收机和从多个发射机接收TPC命令，可以为每个发射机导出不同的TPC目标值。每个发射机接收的TPC命令与该发射机的TPC目标值进行比较。被认为不可靠的TPC命令被丢弃并不组合。

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式