公开(公告)号：WO2008124766A3

公开(公告)日：2008-10-16

申请号：PCT/US2008/059750

申请日：2008-04-09

Applicant: QUALCOMM Incorporated ,  ABRISHAMKAR, Farrokh ,  MOTAMED, Mariam ,  SUBRAHMANYA, Parvathanathan

Inventor： ABRISHAMKAR, Farrokh ,  MOTAMED, Mariam ,  SUBRAHMANYA, Parvathanathan

IPC: H04L25/02

Abstract: Techniques for performing adaptive channel estimation are described. A receiver derives channel estimates for a wireless channel based on received pilot symbols and at least one estimation parameter. The receiver updates the at least one estimation parameter based on the received pilot symbols. The at least one estimation parameter may be for an innovations representation model of the wireless channel and may be updated based on a cost function with costs defined by prediction errors. In one design, the receiver derives predicted pilot symbols based on the received pilot symbols and the at least one estimation parameter, determines prediction errors based on the received pilot symbols and the predicted pilot symbols, and further derives error gradients based on the prediction errors. The receiver then updates the at least one estimation parameter based on the error gradients and the prediction errors, e.g., if a stability test is satisfied.

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

Applicant: QUALCOMM INCORPORATED ,  MERGEN, Gokhan ,  SUBRAHMANYA, Parvathanathan ,  KASTURI, Nitin ,  SUNDARESAN, Rajesh

Inventor： MERGEN, Gokhan ,  SUBRAHMANYA, Parvathanathan ,  KASTURI, Nitin ,  SUNDARESAN, Rajesh

IPC: H04L25/03 ,  H04L7/04 ,  H04L7/033 ,  H04B7/06 ,  H04B7/08

Abstract: 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.

公开(公告)号：WO2005114866A1

公开(公告)日：2005-12-01

申请号：PCT/US2005/013520

申请日：2005-04-19

Applicant: QUALCOMM Incorporated ,  KASTURI, Nitin ,  SUBRAHMANYA, Parvathanathan

Inventor： KASTURI, Nitin ,  SUBRAHMANYA, Parvathanathan

IPC: H04B7/005

CPC classification number: H04W52/221 ,  H04W52/146 ,  H04W52/367

Abstract: Techniques to mitigate spikes in transmit power, by reducing the magnitude and/or duration of the spikes, are described. Initially, power control is performed in a normal manner and in accordance with a transmit power control (TPC) scheme. If a (e.g., upward) transmit power spike is detected, the power control is performed in a manner to mitigate the adverse effects of the spike and in accordance with another TPC scheme. An upward transmit power spike may be detected, e.g., if a predetermined number of consecutive TPC commands in the upward direction is obtained for increasing transmit power. The upward transmit power spike may be mitigated by limiting the transmit power, reducing the rate of transmit power adjustment in the upward direction, delaying and/or filtering TPC decisions used for transmit power adjustment, preventing upward adjustment of transmit power, and so on. Multiple states may be defined and used to facilitate power control with spike mitigation.

Abstract translation: 描述了通过减小​​尖峰的幅度和/或持续时间来减轻发射功率尖峰的技术。 最初，按照发送功率控制（TPC）方式，以正常的方式进行功率控制。 如果检测到（例如，向上）发射功率尖峰，则以减轻尖峰的不利影响并根据另一TPC方案的方式执行功率控制。 可以检测向上的发送功率尖峰，例如，如果获得了向上方向上的预定数量的连续TPC命令以增加发射功率。 通过限制发射功率，降低向上方向的发射功率调整速率，延迟和/或滤波用于发射功率调整的TPC决定，防止发射功率的向上调整等，可以减轻向上发射功率尖峰。 多个状态可以被定义并用于通过尖峰减轻来促进功率控制。

公开(公告)号：WO2005039135A1

公开(公告)日：2005-04-28

申请号：PCT/US2004/034260

申请日：2004-10-14

Applicant: QUALCOMM INCORPORATED ,  SENDONARIS, Andrew ,  SHIU, Da-shan ,  FARMER, Dominick Gerard ,  LIN, Jeremy H. ,  SUBRAHMANYA, Parvathanathan ,  ROWLAND, Thomas K.

Inventor： SENDONARIS, Andrew ,  SHIU, Da-shan ,  FARMER, Dominick Gerard ,  LIN, Jeremy H. ,  SUBRAHMANYA, Parvathanathan ,  ROWLAND, Thomas K.

IPC: H04L27/00

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. To prevent GPS performance degradation during LO tuning, a tuning indicator signal may be generated and provided to the GPS receiver to disable GPS operation.

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。 为了在LO调谐期间防止GPS性能下降，可以产生调谐指示符信号并将其提供给GPS接收器以禁用GPS操作。

公开(公告)号：WO2004006460A3

公开(公告)日：2004-01-15

申请号：PCT/US2003/021595

申请日：2003-07-09

Applicant: QUALCOMM INCORPORATED

Inventor： SUBRAHMANYA, Parvathanathan ,  LIN, Jeremy, H.

IPC: H04B1/707

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 (260) 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：WO2003065608A1

公开(公告)日：2003-08-07

申请号：PCT/US2003/002734

申请日：2003-01-29

Applicant: QUALCOMM, INCORPORATED

Inventor： SUBRAHMANYA, Parvathanathan ,  CLARK, Kevin J.

IPC: H04B1/707

CPC classification number: H04B1/7085 ,  H04B7/0613 ,  H04B2201/70701 ,  Y02D70/40 ,  Y02D70/444

Abstract: Techniques for time tracking diversity pilots are disclosed. In one aspect, an early (462) and a late (482) energy calculation is made on each incoming symbol using a first pilot sequence for despreading (452, 458). The difference between the two energies (464) is used to drive a tracking loop (490), which generates a time reference for producing a first pilot estimate and a second pilot estimate (640), the two estimates used for demodulating data (630). In another aspect, the early and late energies are made including a plurality of incoming symbols, the number of which corresponds to the number of symbols in a run of positive or negative values in an orthogonalizing sequence. The orthogonalizing sequence is used to generate a second pilot sequence from a first pilot sequence, the resulting second pilot sequence being orthogonal to the first. These aspects have the benefit of simplifying the hardware or processing steps required for transmit diversity time tracking, resulting in cost savings, power savings, simplicity of design, and the like.

Abstract translation: 公开了用于时间跟踪分集导频的技术。 在一个方面，使用用于解扩的第一导频序列（452,458）对每个输入符号进行早（462）和晚（482）能量计算。 两个能量之间的差异（464）用于驱动跟踪环路（490），其产生用于产生第一导频估计和第二导频估计的时间参考（640），用于解调数据的两个估计值（630） 。 在另一方面，早期和晚期能量包括多个输入符号，其数目对应于在正交序列中正或负值的运行中的符号数量。 正交化序列用于从第一导频序列生成第二导频序列，所得到的第二导频序列与第一导频序列正交。 这些方面具有简化发送分集时间跟踪所需的硬件或处理步骤的优点，从而节省成本，节省功率，简化设计等。

公开(公告)号：WO2003019808A3

公开(公告)日：2003-03-06

申请号：PCT/US2002/026450

申请日：2002-08-20

Applicant: QUALCOMM INCORPORATED

Inventor： SHIU, Da-shan ,  SUBRAHMANYA, Parvathanathan ,  RAO, Subramanya, P., N.

IPC: H04B1/707

Abstract: Techniques for improved handoff searching in asynchronous systems, such as W-CDMA, are disclosed. In one aspect, a two-step (220, 230) search procedure is used when a list of neighbor codes is known. In the first step (220), 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 (230), 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.

公开(公告)号：WO2018063995A1

公开(公告)日：2018-04-05

申请号：PCT/US2017/053276

申请日：2017-09-25

Applicant: QUALCOMM INCORPORATED

Inventor： ZHAO, Pengkai ,  BHATTACHARJEE, Supratik ,  PARK, Jong Hyeon ,  SUBRAHMANYA, Parvathanathan ,  BANISTER, Brian Clarke ,  NARASIMHA, Madihally

IPC: H04W52/34 ,  H04W52/02

CPC classification number: H03G3/3078 ,  H04B7/0617 ,  H04B7/0626 ,  H04L27/2662 ,  H04W24/02 ,  H04W28/04 ,  H04W52/0206 ,  H04W52/0209 ,  H04W52/346 ,  H04W52/52 ,  H04W72/06 ,  Y02D70/00 ,  Y02D70/1242 ,  Y02D70/1262 ,  Y02D70/142

Abstract: A method, a computer-readable medium, and an apparatus are disclosed for energy efficient multichannel communications. In one aspect, the apparatus may communicate using a plurality of channels working in parallel where the plurality of channels may share an LNA. Additionally, the apparatus may determine a set of parameters for the plurality of channels to maximize energy efficiency. The apparatus may therefore configure the plurality of channels based on the set of parameters. As such, the apparatus supports multichannel communications with a common LNA structure while providing energy optimization for the multichannel communications. Accordingly, multichannel communications can be provided using a shared LNA structure that reduces implementation cost and more efficiently utilizes available power resources.

Abstract translation: 公开了用于高能效多通道通信的方法，计算机可读介质和设备。 在一个方面，该装置可以使用并行工作的多个信道进行通信，其中多个信道可以共享LNA。 另外，该设备可确定多个通道的一组参数以最大化能量效率。 该设备因此可以基于该组参数来配置多个信道。 如此，该设备支持具有公共LNA结构的多通道通信，同时为多通道通信提供能量优化。 相应地，可以使用共享的LNA结构来提供多通道通信，该LNA结构降低实施成本并且更有效地利用可用的功率资源。

公开(公告)号：WO2014005119A1

公开(公告)日：2014-01-03

申请号：PCT/US2013/048764

申请日：2013-06-28

Applicant: QUALCOMM INCORPORATED

Inventor： GRUBER, Hans Georg ,  DRAVIDA, Subra ,  SUBRAHMANYA, Parvathanathan ,  NAWARE, Vidyut M. ,  O'SHEA, Helena Deirdre ,  SHIH, Garret Webster ,  THURSTON, Jason

IPC: H04L29/06 ,  H04L7/04 ,  H04L1/00

CPC classification number: H03M13/09 ,  H04L1/004 ,  H04L1/0061 ,  H04L1/0072

Abstract: A method, an apparatus, and a computer program product for communication within a wireless terminal. The method can be implemented using dedicated logic and managed and controlled by state machines and/or sequencers. Data received or provided in a memory of a first integrated circuit of a terminal is encoded and transmitted in a data packet to a second integrated circuit. A header identifying the data type and providing a destination is included in the data packet. The destination may be identified as a memory address memory of the second integrated circuit that is mapped to a corresponding memory address of the first integrated circuit at which the data is received. In an aspect, the apparatus receives a header, detects an error in the received header, determines a failure to identify a packet boundary when the error is detected, and performs a search operation to identify the packet boundary.

Abstract translation: 一种用于在无线终端内进行通信的方法，装置和计算机程序产品。 该方法可以使用专用逻辑实现，并由状态机和/或定序器进行管理和控制。 接收或提供在终端的第一集成电路的存储器中的数据被编码并在数据分组中被发送到第二集成电路。 识别数据类型并提供目的地的报头被包括在数据分组中。 目的地可以被识别为第二集成电路的存储器地址存储器，其被映射到接收数据的第一集成电路的相应存储器地址。 在一方面，该装置接收报头，检测出接收到的报头中的错误，确定在检测到错误时识别分组边界的故障，并执行识别分组边界的搜索操作。

公开(公告)号：WO2013119376A1

公开(公告)日：2013-08-15

申请号：PCT/US2013/022256

申请日：2013-01-18

Applicant: QUALCOMM INCORPORATED

Inventor： SRIPATHI, Prashant Udupa ,  SUBRAHMANYA, Parvathanathan

IPC: H04B1/7097 ,  H04K3/00 ,  H04J11/00

CPC classification number: H04J11/0023

Abstract: A method, an apparatus, and a computer program product for wireless communication are provided in which PAPR for an input of an AGC in a wireless receiver is generated. The AGC may provide a gain-controlled signal to a correlator when the PAPR of the input does not exceed the threshold ratio and may clamp the gain of the gain-controlled signal when PAPR of the input is large. A large PAPR may cause termination of search for a signal of interest in a current channel. The search may be resumed in a non-adjacent channel.

Abstract translation: 提供了一种用于无线通信的方法，装置和计算机程序产品，其中生成用于无线接收机中的AGC输入的PAPR。 当输入的PAPR不超过阈值比率时，AGC可以向相关器提供增益控制信号，并且当输入的PAPR较大时可以钳位增益控制信号的增益。 大的PAPR可能导致终止对当前频道中的感兴趣信号的搜索。 可以在非相邻信道中恢复搜索。