公开(公告)号：WO2004040787A3

公开(公告)日：2004-05-13

申请号：PCT/US2003/034784

申请日：2003-10-31

Applicant: QUALCOMM INCORPORATED

Inventor： SHIU, Da-shan ,  ZHANG, Li ,  SY, Eugene ,  MALDONADO, David ,  DHALIWAL, Upkar

IPC: H04B1/40

Abstract: Techniques for improved low latency frequency switching are disclosed. In one embodiment, a controller (510) receives a frequency switch command and generates a frequency switch signal at a time determined in accordance with a system timer (520). In another embodiment, gain calibration is initiated subsequent to the frequency switch signal delayed by the expected frequency synthesizer settling time. In yet another embodiment, DC cancellation control (540) and gain control (530) are iterated to perform gain calibration, with signaling to control the iterations without need for processor (550) intervention. Various other embodiments are also presented. Aspects of the embodiments disclosed may yield the benefit of reducing latency during frequency switching, allowing for increased measurements at alternate frequencies, reduced time spent on alternate frequencies, and the capacity and throughput improvements that follow from minimization of disruption of an active communication session and improved neighbor selection.

公开(公告)号：WO2003003586A3

公开(公告)日：2003-01-09

申请号：PCT/US2002/020345

申请日：2002-06-26

Applicant: QUALCOMM INCORPORATED

Inventor： SHIU, Da-shan ,  SUNDARESAN, Rajesh

IPC: H03M13/45

Abstract: Techniques to improve the performance of a Turbo decoder when scale information for the bits in a code segment to be decoded is not known. A number of hypotheses are formed for the code segment, with each hypothesis corresponding to a particular set of one or more values for a set of one or more parameters used for decoding the code segment. For the MAP decoding scheme, these parameters may be for the sequence of scaling factors used to scale the bits prior to decoding and/or a scale used to evaluate a (e.g., min*) function for the MAP decoding. The code segment is decoded based on the MAP decoding scheme and in accordance with each hypothesis. The quality of the decoded result for each hypothesis is determined based on one or more performance metrics. The decoded bits for the best hypothesis are provided as the Turbo decoder output.

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：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：WO2005067168A1

公开(公告)日：2005-07-21

申请号：PCT/US2004/043970

申请日：2004-12-29

Applicant: QUALCOMM INCORPORATED ,  HSU, Chih-Ping ,  SUBRAHMANYA, Parvathanathan ,  SHIU, Da-shan ,  OH, Hyukjun ,  RIDDLE, Christopher, C. ,  KASTURI, Nitin

Inventor： HSU, Chih-Ping ,  SUBRAHMANYA, Parvathanathan ,  SHIU, Da-shan ,  OH, Hyukjun ,  RIDDLE, Christopher, C. ,  KASTURI, Nitin

IPC: H04B7/005

CPC classification number: H04W52/12 ,  H04W52/34 ,  H04W52/36

Abstract: Techniques are provided to control the transmit power for data transmission on multiple transport channels having different signal quality (SIR) targets. A single SIR target is maintained for all transport channels, and this SIR target is adjusted based only on active transport channels. For each update interval, a data processor processes at least one data block received in the current update interval on at least one of the transport channels and provides the status of each received data block. A controller increases the SIR target based on an up step if any received data block is erased and decreases the SIR target based on a down step if all received data blocks are good. If any received data block is erased, the down step used to adjust the SIR target may be set to the smallest down step size required by all transport channels with erased data blocks.

Abstract translation: 提供技术来控制具有不同信号质量（SIR）目标的多个传输信道上的数据传输的发射功率。 对于所有传输信道维持单个SIR目标，并且该SIR目标仅基于主动传输信道进行调整。 对于每个更新间隔，数据处理器处理在当前更新间隔中在至少一个传输信道上接收的至少一个数据块，并提供每个接收到的数据块的状态。 如果任何接收到的数据块被擦除，则控制器基于上升步骤增加SIR目标，并且如果所有接收到的数据块都良好，则基于下降步骤降低SIR目标。 如果任何接收到的数据块被擦除，用于调整SIR目标的下降步骤可以被设置为具有被擦除的数据块的所有传输信道所需的最小的下降步长。

公开(公告)号：WO2004054130A2

公开(公告)日：2004-06-24

申请号：PCT/US2003/038807

申请日：2003-12-04

Applicant: QUALCOMM, INCORPORATED

Inventor： OH, Hyukjun ,  BLESSENT, Luca ,  HSU, Chih-Ping ,  SHIU, Da-shan ,  KASTURI, Nitin ,  SUBRAHMANYA, Parvathanathan

IPC: H04B7/005

CPC classification number: H04W52/362 ,  H04W52/12 ,  H04W52/143 ,  H04W52/24 ,  H04W52/367

Abstract: Techniques to quickly adjust an SIR target toward a final value needed to achieve a specified target BLER for a data transmission. The outer loop may be implemented with multiple modes. The SIR target may be maintained fixed in a hold mode, adjusted in large down steps to speed up convergence in an acquisition mode, and adjusted by a small down step and a large up step for good and erased blocks, respectively, in a tracking mode. Various schemes may be used to adjust the SIR target by larger down steps in the acquisition mode. These schemes may be used even if data is transmitted intermittently, the target BLER is set to a low value, and/or one or multiple transport channels are used for data transmission. The SIR target may be boosted by a particular amount upon transitioning from the acquisition mode to the tracking mode.

Abstract translation: 快速调整SIR目标朝向实现数据传输的指定目标BLER所需的最终值的技术。 外环可以用多种模式实现。 SIR目标可以保持固定在保持模式下，以较大的向下步骤进行调整以加速采集模式中的收敛，并且在追踪模式下分别通过较小的下一步和较大的上升步骤对良好块和擦除块进行调整 。 可以使用各种方案通过采集模式中较大的下降步骤来调整SIR目标。 即使数据间歇地传输，目标BLER被设置为低值，并且/或者一个或多个传输信道被用于数据传输，也可以使用这些方案。 在从采集模式转换到跟踪模式时，SIR目标可以被增加特定量。

公开(公告)号：WO2004045096A2

公开(公告)日：2004-05-27

申请号：PCT/US2003/035260

申请日：2003-11-05

Applicant: QUALCOMM, INCORPORATED

Inventor： SHIU, Da-shan ,  MALLADI, Durga P. ,  BHASHYAM, Srikrishna

IPC: H04B1/10

CPC classification number: H04B1/1027 ,  H04B1/7097 ,  H04L1/20 ,  H04L25/0228

Abstract: Noise measurements are made within a fraction of a single symbol period of a longest orthogonal code symbol. A control processor (520) identifies an unoccupied code having a spreading factor that is less than a longest spreading factor for the system. A despreader (512) measures symbol energy based on the unoccupied code and a noise estimator (516) generates noise estimations based on the measured symbol energies. The subscriber station uses similar techniques in order to perform channel estimations within a period that is a fraction of a symbol period of a longest-spreading-factor code.

Abstract translation: 在最长正交码符号的单个符号周期的一小部分内进行噪声测量。 控制处理器（520）识别具有小于系统的最长扩展因子的扩展因子的未占用代码。 解扩器（512）基于未占用代码来测量符号能量，并且噪声估计器（516）基于所测量的符号能量产生噪声估计。 订户站使用类似的技术，以便在作为最长扩展因子码的符号周期的一部分的周期内执行信道估计。

公开(公告)号：WO2003017527A3

公开(公告)日：2003-02-27

申请号：PCT/US2002/026449

申请日：2002-08-20

Applicant: QUALCOMM INCORPORATED

Inventor： SHIU, Da-shan ,  WILLENEGGER, Serge ,  CHI, Richard ,  SUBRAHMANYA, Parvathanathan ,  HSU, Chih-Ping

IPC: H04B7/005

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：WO2004073207A1

公开(公告)日：2004-08-26

申请号：PCT/US2004/003903

申请日：2004-02-09

Applicant: QUALCOMM INCORPORATED ,  JOOTAR, Jittra ,  SHIU, Da-shan ,  SUBRAHMANYA, Parvathanathan

Inventor： JOOTAR, Jittra ,  SHIU, Da-shan ,  SUBRAHMANYA, Parvathanathan

IPC: H04B7/06

CPC classification number: H04B7/0634

Abstract: 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.

Abstract translation: 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。

公开(公告)号：WO2003063378A1

公开(公告)日：2003-07-31

申请号：PCT/US2003/001565

申请日：2003-01-17

Applicant: QUALCOMM INCORPORATED

Inventor： RAO, Subramanya, P. ,  SHIU, Da-shan ,  LIN, Jeremy, H. ,  KIM, Jeong, Geun

IPC: H04B1/707

CPC classification number: H04B1/7077 ,  H04B1/70753 ,  H04B2201/70707

Abstract: Techniques for segmented CDMA searching are disclosed. In one aspect, a searcher comprises a plurality of storage elements (360) selectable for performing a plurality of segmentable search tasks, each storage element operable for storage of and access to state information for one of the plurality of search tasks. In another aspect, a first search task is interrupted in progress, the state information for the first task is stored, a second search task is performed, and the first search task is continued using the stored state information. In yet another aspect, a search task is segmented into smaller search segments, sized to fit within contiguous available time in the searcher. Various other aspects of the invention are also presented. These aspects have the benefit of circuit area and search-time efficiency which translate into reduced costs, increased standby time, increased acquisition speed, higher quality signal transmission, increased data throughput, decreased power, and improved overall system capacity.

Abstract translation: 公开了分段CDMA搜索的技术。 在一个方面，搜索器包括可选择用于执行多个可分割搜索任务的多个存储元件（360），每个存储元件可操作用于存储和访问多个搜索任务之一的状态信息。 在另一方面，第一搜索任务在进行中中断，存储第一任务的状态信息，执行第二搜索任务，并且使用所存储的状态信息继续第一搜索任务。 在另一方面，搜索任务被分割成较小的搜索段，其大小适合于搜索者中的连续可用时间。 还提出了本发明的各种其它方面。 这些方面具有电路面积和搜索时间效率的优点，从而降低了成本，增加了待机时间，提高了采集速度，提高了信号传输质量，提高了数据吞吐量，降低了功耗，提高了整体系统容量。