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    Apparatus and method for calibrating frequency of local oscillator in wireless communications
    11.
    发明专利
    Apparatus and method for calibrating frequency of local oscillator in wireless communications 有权
    无线通信中本地振荡器频率校准的装置及方法

    公开(公告)号：JP2009246998A

    公开(公告)日：2009-10-22

    申请号：JP2009143915

    申请日：2009-06-17

    Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    Inventor： GILBERT C SIH ,  CHALLA RAGHU

    IPC: H04L27/38 ,  H03B1/00 ,  H04B1/16 ,  H04L27/00

    CPC classification number: H04L27/0014 ,  H04L2027/0016 ,  H04L2027/0057 ,  H04L2027/0087

    Abstract: PROBLEM TO BE SOLVED: To provide an apparatus and a method for calibrating the frequency of a local oscillator in wireless communications.
    SOLUTION: According to a disclosed embodiment, a receiver comprising a digital rotator in combination with a frequency error discriminator in a digital automatic frequency control loop is used to obtain accurate digital values used to calibrate a local oscillation frequency. A frequency error in the oscillation frequency of a local frequency generation loop causes a change in the frequency of a baseband input signal. The change in the baseband input signal frequency related to the frequency error in the local frequency generation loop can be detected as a phase rotation by the frequency error discriminator. By using the digital automatic frequency control loop, the frequency error introduced by local frequency generation is determined with accuracy. The frequency error and corresponding control bits are entered into a calibration table. The calibration table may be used to adjust the local oscillation frequency for temperature changes, pilot searching, and quick paging.
    COPYRIGHT: (C)2010,JPO&INPIT

    Abstract translation: 要解决的问题：提供一种用于在无线通信中校准本地振荡器的频率的装置和方法。 解决方案：根据所公开的实施例，使用包括与数字自动频率控制环路中的频率误差鉴别器结合的数字旋转器的接收器来获得用于校准本地振荡频率的精确数字值。 本地频率发生环路的振荡频率的频率误差导致基带输入信号的频率变化。 与本地频率产生回路中的频率误差相关的基带输入信号频率的变化可以被频率误差鉴别器检测为相位旋转。 通过使用数字自动频率控制环路，准确地确定本地频率发生引入的频率误差。 将频率误差和相应的控制位输入校准表。 校准表可用于调整温度变化，导频搜索和快速寻呼的本地振荡频率。 版权所有（C）2010，JPO＆INPIT

    Low frequency sleep clock error correction within mobile station operating in slotted paging mode
    12.
    发明专利
    Low frequency sleep clock error correction within mobile station operating in slotted paging mode 有权
    移动式移动站中的低频睡眠时钟错误校正

    公开(公告)号：JP2009239905A

    公开(公告)日：2009-10-15

    申请号：JP2009066166

    申请日：2009-03-18

    Applicant: Qualcomm Inc ,  クゥアルコム・インコーポレイテッドQualcomm Incorporated

    Inventor： CHALLA RAGHU ,  ACHOUR BAAZIZ ,  HUGHES ROBBIN D

    IPC: H04L29/00 ,  H04W52/02 ,  H04B1/16 ,  H04B1/40 ,  H04B1/707 ,  H04B7/26 ,  H04M1/73

    CPC classification number: H04B1/70756 ,  H04B2201/70709 ,  H04W52/0216 ,  H04W52/029 ,  H04W56/0035 ,  Y02D70/00 ,  Y02D70/40

    Abstract: PROBLEM TO BE SOLVED: To facilitate the effective use of low frequency low power clocks for a sleep mode of a wireless communication device, even when relatively large slot cycles are defined within a slotted paging system. SOLUTION: Techniques may include reducing power in the wireless communication device for a first sleep period and then increasing power in the wireless communication device for an intermediate wake period after the first sleep period to estimate an error of the sleep clock. The method may further include reducing power in the wireless communication device for a second sleep period after the intermediate wake period. The intermediate wake mode implemented during the intermediate period can be used to estimate the error of the sleep clock without performing one or more tasks associated with an awake mode, such as demodulation. COPYRIGHT: (C)2010,JPO&INPIT

    Abstract translation: 要解决的问题：即使在时隙寻呼系统中定义相对较大的时隙周期，为了便于有效利用无线通信设备的睡眠模式的低频低功率时钟。 解决方案：技术可以包括在第一睡眠周期内减少无线通信设备中的功率，然后在第一睡眠周期之后的中间唤醒周期增加无线通信设备中的功率，以估计睡眠时钟的误差。 该方法还可以包括在中间唤醒周期之后的第二睡眠周期内减少无线通信设备中的功率。 在中间周期期间实现的中间唤醒模式可用于估计休眠时钟的误差，而不执行与诸如解调之类的唤醒模式相关联的一个或多个任务。 版权所有（C）2010，JPO＆INPIT

    GRAPHICS ENGINE WITH EFFICIENT INTERPOLATION
    14.
    发明专利
    GRAPHICS ENGINE WITH EFFICIENT INTERPOLATION 未知

    公开(公告)号：CA2620212C

    公开(公告)日：2012-01-10

    申请号：CA2620212

    申请日：2006-08-24

    Applicant: QUALCOMM INC

    Inventor： CHALLA RAGHU

    IPC: G06T11/40 ,  G06T15/00 ,  G06T15/80

    Abstract: A graphics engine includes a setup unit and a rendering unit. The setup unit computes coefficients A, B, and C used for interpolating an attribute .nu. of a triangle to be rendered for a graphics image. The setup unit then derives compressed coefficients Ã, ~B, and ~C based on the coefficients A, B, and C. The compressed coefficients have a fixed-point format with R integer bits left of a binary point and T fractional bits right of the binary point, where R>1 and T>=0. R is selected based on the number of bits used for attribute .nu., T is selected based on the screen dimension, and R+T is much less than the number of bits used to represent the coefficients A, B, and C. The rendering unit performs interpolation for the attribute v using the compressed coefficients Ã, ~B, and ~C, and may be implemented with a simple (R+T)-bit non-saturating accumulator.

    18.
    发明专利
    未知

    公开(公告)号：AT400082T

    公开(公告)日：2008-07-15

    申请号：AT03721474

    申请日：2003-03-26

    Applicant: QUALCOMM INC

    Inventor： BLACK PETER J ,  SINDHUSHAYANA NAGABHUSHANA ,  CHALLA RAGHU ,  SELTMANN KEVIN

    IPC: H03G3/20 ,  H03G3/30 ,  H04B1/04 ,  H04B1/16 ,  H04B1/38 ,  H04B1/40

    Abstract: Systems and techniques for gain control include amplifying a signal with an amplifier having a gain represented by one of a plurality of gain curves depending on a value of a parameter, the signal being amplified at a first one of the parameter values, and controlling the gain of the amplified signal from a predetermined gain curve relating to the gain curve of the amplifier for a second one of the parameter values by adjusting a gain control signal corresponding to a point on the predetermined gain curve as a function of the first one of the parameter values, and applying the adjusted gain control signal to the amplifier. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

    SUPRESION DE INTERFERENCIA CON ANTENAS VIRTUALES.
    20.
    发明专利
    SUPRESION DE INTERFERENCIA CON ANTENAS VIRTUALES. 未知

    公开(公告)号：MX2007006025A

    公开(公告)日：2007-07-20

    申请号：MX2007006025

    申请日：2005-11-17

    Applicant: QUALCOMM INC

    Inventor： CHALLA RAGHU ,  RICK ROLAND REINHARD

    IPC: H04L25/00

    Abstract: Un receptor suprime la interferencia de co-canal (CCI) de otros transmisores e interferencia inter-simbolo (ISI) debido a la distorsion del canal utilizando antenas "virtuales", las antenas virtuales se pueden formar mediante (1) sobremuestreando una senal recibida para cada antena real en el receptor y/o (2) descomponiendo una secuencia de muestras con valor complejo en una secuencia de muestras en-fase y una secuencia de muestras en cuadratura; en un diseno, el receptor incluye un pre-procesador, un supresor de interferencia, y un ecualizador; el pre-procesador procesa las muestras recibidas por lo menos para una antena real y general por lo menos dos secuencias de muestras de entrada para cada antena real; el supresor de interferencia suprime la interferencia de co-canal en las secuencias de muestras de entrada y provee por lo menos una secuencia de muestras con CCI suprimida; el ecualizador ejecuta la deteccion en la(s) secuencia(s) de muestra con CCI suprimida y provee los bits detectados; el supresor de interferencia y el ecualizador pueden ser operados para una o multiples iteracciones.

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