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    METHODS AND APPARATUS FOR IMPLEMENTING PHASE ROTATION AT BASEBAND FREQUENCY FOR TRANSMIT DIVERSITY
    31.
    发明公开
    METHODS AND APPARATUS FOR IMPLEMENTING PHASE ROTATION AT BASEBAND FREQUENCY FOR TRANSMIT DIVERSITY 审中-公开
    VERFAHREN UND VORRICHTUNG ZUR PHASENVERSCHIEBUNG BEI BASISBANDFREQUENZFÜRÜBERTRAGUNGSDIVERSITÄT

    公开(公告)号：EP2308190A2

    公开(公告)日：2011-04-13

    申请号：EP09791097.0

    申请日：2009-08-03

    Applicant: QUALCOMM Incorporated

    Inventor： TANG, Yiwu ,  HOLENSTEIN, Christian ,  CASSIA, Marco ,  RANJAN, Mahim

    IPC: H04L1/06 ,  H04L1/08

    CPC classification number: H04B7/0682 ,  H04L1/0618 ,  H04L1/08

    Abstract: An apparatus for implementing phase rotation at baseband frequency for transmit diversity may include a primary transmit signal path and a diversity transmit signal path. Both the primary transmit signal path and the diversity transmit signal path may receive a primary transmit signal. A signal selector within the diversity transmit signal path may perform phase rotation with respect to the primary transmit signal while the primary transmit signal is at a baseband frequency, thereby producing a diversity transmit signal.

    Abstract translation: 用于实现用于发射分集的基带频率处的相位旋转的装置可以包括主发射信号路径和分集发射信号路径。 主发射信号路径和分集发射信号路径都可以接收主发射信号。 分集发射信号路径内的信号选择器可以在主发射信号处于基带频率时相对于主发射信号执行相位旋转，从而产生分集发射信号。

    DC OFFSET CANCELLATION CIRCUIT FOR A RECEIVER
    32.
    发明公开
    DC OFFSET CANCELLATION CIRCUIT FOR A RECEIVER 审中-公开
    接收器使用偏移补偿

    公开(公告)号：EP1929626A1

    公开(公告)日：2008-06-11

    申请号：EP06816070.4

    申请日：2006-09-28

    Applicant: Qualcomm Incorporated

    Inventor： SUN, Runhua ,  HOLENSTEIN, Christian ,  JAFFEE, James

    IPC: H03D3/00

    CPC classification number: H03D3/008

    Abstract: Techniques for cancelling DC offset are described. A DC offset cancellation circuit in a receiver cancels DC offsets caused by leaked LO (local oscillator) signals from a LO signal generator. The receiver first calibrates itself by using the DC offset cancellation circuit during a transmit mode. During the calibration, the DC offset cancellation circuit stores the DC offset voltage signal caused by the leaked LO signals. During a receiving mode when the receiver is receiving a signal, the receiver subtracts the stored DC offset voltage signal from the received signal to cancel the DC offsets caused by leaked LO signals.

    RECEIVER ARCHITECTURE
    36.
    发明公开
    RECEIVER ARCHITECTURE 有权
    EMPFÄNGER，建筑学

    公开(公告)号：EP2896130A1

    公开(公告)日：2015-07-22

    申请号：EP13767181.4

    申请日：2013-09-11

    Applicant: Qualcomm Incorporated

    Inventor： CHANG, Li-Chung ,  GUDEM, Prasad Srinivasa Siva ,  BOSSU, Frederic ,  HOLENSTEIN, Christian

    IPC: H04B1/00 ,  H04B1/28

    CPC classification number: H04J3/00 ,  H03F3/72 ,  H04B1/0064 ,  H04B1/0071

    Abstract: A receiver architecture for carrier aggregation is disclosed. In an exemplary design, an apparatus (e.g., a wireless device, a circuit module, etc.) includes a plurality of low noise amplifiers (LNAs), a plurality of switches, and at least one downconverter. The LNAs receive and amplify at least one input radio frequency (RF) signal and provide at least one amplified RF signal. The switches are coupled to the outputs of the plurality of LNAs. The at least one downconverter is coupled to the plurality of switches, downconverts the at least one amplified RF signal, and provides at least one downconverted signal. The switches reduce the number of downconverters needed to support reception of transmissions on multiple sets of carriers via multiple receive antennas. The LNAs and the switches may be implemented on at least one front-end module or a back-end module. The downconverter(s) are implemented on the back-end module.

    Abstract translation: 公开了用于载波聚合的接收机架构。 在示例性设计中，装置（例如，无线装置，电路模块等）包括多个低噪声放大器（LNA），多个开关和至少一个下变频器。 LNA接收和放大至少一个输入射频（RF）信号并提供至少一个放大的RF信号。 开关耦合到多个LNA的输出端。 所述至少一个下变频器耦合到所述多个开关，对所述至少一个放大的RF信号进行下变频，并提供至少一个下变频信号。 交换机减少了通过多个接收天线支持在多组载波上接收传输所需的下变频器的数量。 LNA和交换机可以在至少一个前端模块或后端模块上实现。 下变频器在后端模块上实现。

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