公开(公告)号：EP1678901B1

公开(公告)日：2008-11-26

申请号：EP04795424.3

申请日：2004-10-14

Applicant: QUALCOMM INCORPORATED

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

IPC: H04L27/00 ,  H04B1/38

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.

公开(公告)号：EP1678901A1

公开(公告)日：2006-07-12

申请号：EP04795424.3

申请日：2004-10-14

Applicant: QUALCOMM INCORPORATED

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

IPC: H04L27/00 ,  H04B1/38

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.

公开(公告)号：EP1419591A1

公开(公告)日：2004-05-19

申请号：EP02763523.4

申请日：2002-08-22

Applicant: QUALCOMM Incorporated

Inventor： SUBRAHMANYA, Parvathanathan

IPC: H04B7/005

CPC classification number: H04W52/40

Abstract: Techniques to combine soft-decision power control symbols received for multiple active base stations. In one method, a received signal is initially processed to derive soft-decision (multi-bit valued) symbols for power control commands transmitted from a number of base stations. Each soft-decision symbol for each base station is then scaled based on a scaling factor associated with the base station and which is related to the received signal quality for the power control symbols for the base station. The scaling allows power control symbols for more reliably received base stations to be given greater weights. The scaled soft-decision symbols for each power control period are then combined to provide a decision metric for the period. Each decision metric is then compared against a particular threshold, and a power control decision is derived for each decision metric based on the result of the comparison.

公开(公告)号：EP1419586A2

公开(公告)日：2004-05-19

申请号：EP02759411.8

申请日：2002-08-20

Applicant: QUALCOMM Incorporated

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

IPC: H04B1/707

CPC classification number: H04B1/7083 ,  H04B2201/70701 ,  H04B2201/70702 ,  H04W36/00 ,  H04W48/16 ,  Y02D70/40

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

Abstract translation: 公开了用于在诸如W-CDMA之类的异步系统中改进切换搜索的技术。 在一个方面，当已知邻居码列表时，使用两步搜索过程。 在第一步骤中，接收的信号与时隙定时码相关联，以定位或多于其上的导频和与其相关联的时隙边界。 在第二步骤中，接收的信号与在第一步骤中用导频识别的时隙边界上的每个代码列表相关联，以识别与每个导频相关联的导频码和帧定时。 还提出了本发明的各种其它方面。 这些方面具有减少搜索时间的优点，这意味着增加的采集速度，更高质量的信号传输，增加的数据吞吐量，降低的功率以及整体系统容量的提高。

公开(公告)号：EP1407562A1

公开(公告)日：2004-04-14

申请号：EP02752244.0

申请日：2002-07-09

Applicant: Qualcomm Incorporated

Inventor： GRILLI, Francesco ,  WHEATLEY, Charles E., III ,  WILLENEGGER, Serge ,  SUBRAHMANYA, Parvathanathan

IPC: H04B7/26

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).