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    METHOD AND APPARATUS FOR REMOVING DC OFFSET IN A DIRECT CONVERSION RECEIVER
    1.
    发明申请
    METHOD AND APPARATUS FOR REMOVING DC OFFSET IN A DIRECT CONVERSION RECEIVER 审中-公开
    在直接转换接收器中移除直流偏置的方法和装置

    公开(公告)号：WO2010065281A3

    公开(公告)日：2010-08-26

    申请号：PCT/US2009064679

    申请日：2009-11-17

    Applicant: MOTOROLA INC ,  STOGNER DARRELL J ,  RAO YADUNANDANA N ,  RUELKE CHARLES R ,  LAMPERT CHET A

    Inventor： STOGNER DARRELL J ,  RAO YADUNANDANA N ,  RUELKE CHARLES R ,  LAMPERT CHET A

    IPC: H04B1/30 ,  H04B17/40 ,  H03D1/04

    CPC classification number: H04B1/30 ,  H04L25/061

    Abstract: A method and apparatus for correcting direct current (DC) offset errors of a received signal in a direct conversion receiver (DCR) are provided. DC offset correction algorithms are incorporated into the DCR, each algorithm being optimized for a particular receive signal operating environment. The DC offset correction algorithms remove DC offset errors in baseband In-phase and Quadrature-phase signals received within the direct conversion receiver baseband signal path. Individual DC offset correction algorithms are selected for use as determined by a signal quality estimator component. A DC offset correction component of the direct conversion receiver determines an appropriate DC offset correction algorithm suited for a particular operating environment. A criterion for a signal quality estimate is set to control transitioning between DCOC algorithms. A dual threshold strategy may be adopted to transition between one DC offset correction algorithm and another DC offset correction algorithm to provide hysteresis.

    Abstract translation: 提供了用于校正直接转换接收机（DCR）中的接收信号的直流（DC）偏移误差的方法和装置。 DC偏移校正算法被并入到DCR中，每个算法针对特定的接收信号操作环境进行优化。 DC偏移校正算法消除了在直接转换接收机基带信号路径内接收到的基带同相和正交相信号中的直流失调误差。 选择单个DC偏移校正算法以由信号质量估计器组件确定使用。 直接转换接收机的DC偏移校正分量确定适合于特定操作环境的适当DC偏移校正算法。 设置信号质量估计的标准来控制DCOC算法之间的转换。 可以采用双阈值策略来在一个DC偏移校正算法和另一个DC偏移校正算法之间转换以提供滞后。

    METHOD FOR SELECTING AN OPERATING MODE BASED ON A DETECTED SYNCHRONIZATION PATTERN
    2.
    发明专利
    METHOD FOR SELECTING AN OPERATING MODE BASED ON A DETECTED SYNCHRONIZATION PATTERN 未知

    公开(公告)号：CA2527142C

    公开(公告)日：2009-04-07

    申请号：CA2527142

    申请日：2004-04-29

    Applicant: MOTOROLA INC

    Inventor： STOGNER DARRELL J ,  MURI DAVID L ,  BIGGS ROBERT A ,  HIBEN BRADLEY M ,  WILSON ALAN L ,  NEWBERG DONALD G

    IPC: H04W56/00 ,  H04J3/06 ,  H04Q20060101 ,  H04W80/00

    Abstract: A received synchronization pattern is compared against first and second know n synchronization patterns. If the received pattern is substantially similar t o the first known pattern, the payload is processed as voice; and if the received pattern is substantially similar to the second known pattern, the payload is processed as non-voice. Alternatively, a target synchronization pattern dependent on an operating mode is selected. The received pattern is compared against the target pattern. If the received pattern is substantiall y similar to the target pattern, the payload is processed; otherwise, the burs t is discarded. In yet another alternative, the received pattern is compared against first and second known synchronization patterns having a common length. If the received pattern is substantially similar to the first known pattern, a first operating mode is selected, and if the received pattern is substantially similar to the second known pattern, a second operating mode i s selected.

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