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    Apparatus in a communication system
    2.
    发明授权
    Apparatus in a communication system 失效
    设备在通信系统

    公开(公告)号：EP0963626B1

    公开(公告)日：2006-01-11

    申请号：EP98901614.2

    申请日：1998-01-13

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)

    发明人： MANNERSTRLE, Jacob ,  ISBERG, Martin ,  LINDQUIST, Björn ,  CARLSSON, Torsten ,  HAGBERG, Hans ,  JAKOBSSON, Peter ,  KÜNKEL, Lars, Peter ,  GUSTAFSSON, Kjell

    IPC分类号： H04B1/26 ,  H03D7/16

    CPC分类号： H04B1/0057 ,  H03D3/007 ,  H04B1/005 ,  H04B1/406

    摘要： The present invention relates to a receiver device comprising a receiver (104) adapted to receive radio signals in two frequency bands (FB1, FB2). The radio signals in one of the frequency bands (FB1) constitute communication signals for a radio system (AMPS, NMT) having a certain channel spacing, whereas the radio signals of the second frequency band (FB2) constitutes communication signals for a second radio system (PCS1900, DCS1800, GSM) having a second certain channel spacing. The receiver (104) comprises two inputs (108, 11) each intended for a radio system having different frequency bands and channel spacing. For radio signals occuring on one input (108), mixing is performed from the RF range directly to the baseband frequency range. For radio signals occuring on the second input (108) the mixing from the radio frequency range to the baseband frequency range is carried out through an intermediate frequency range. Further the receiver (104) comprises an output (112) intended to deliver baseband signals for both radio systems. The output (112) is connected to a baseband unit which is common to the radio systems. In the baseband unit, among other things, lowpass filtering, detection and neighbouring channel suppression are performed on the received radio signal that has been mixed down to the baseband frequency range.

    METHOD AND APPARATUS FOR FREQUENCY SYNTHESIS IN DIRECT-CONVERSION TRANSMITTERS
    5.
    发明公开
    METHOD AND APPARATUS FOR FREQUENCY SYNTHESIS IN DIRECT-CONVERSION TRANSMITTERS 有权
    方法和设备频率合成AT与直接变换STATIONS

    公开(公告)号：EP1905165A1

    公开(公告)日：2008-04-02

    申请号：EP06777581.7

    申请日：2006-07-05

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)

    发明人： LOMBARDI, Frank ,  FREED, John, G. ,  ISBERG, Martin

    IPC分类号： H04B1/50 ,  H04B1/40

    CPC分类号： H04B1/30 ,  H03C3/0966 ,  H03C3/0983 ,  H03C5/00 ,  H03L7/185 ,  H03L7/1974 ,  H03L7/23

    摘要： A method and apparatus for direct-conversion transmission generates a first frequency signal that is non-harmonically related to a transmit frequency signal, divides the first frequency signal to obtain a mixing frequency signal, divides the first frequency signal to obtain an intermediate frequency reference signal, generates the transmit frequency signal by using the mixing frequency signal to downconvert the transmit frequency signal into an intermediate frequency feedback signal, and phase-locks the intermediate frequency feedback signal to the intermediate frequency reference signal. The transmit frequency signal may be phase modulated, and may serve as an input to a saturated-mode power amplifier that can be configured for corresponding amplitude modulation. Alternatively, the un-modulated transmit frequency signal serves as the carrier signal input to a quadrature modulator, which imparts I/Q modulations to it, thereby producing a modulated carrier signal for input to a linear power amplifier.

    METHOD AND APPARATUS FOR FREQUENCY SYNTHESIS IN DIRECT-CONVERSION TRANSMITTERS
    8.
    发明授权
    METHOD AND APPARATUS FOR FREQUENCY SYNTHESIS IN DIRECT-CONVERSION TRANSMITTERS 有权
    方法和设备频率合成AT与直接变换STATIONS

    公开(公告)号：EP1905165B1

    公开(公告)日：2009-03-04

    申请号：EP06777581.7

    申请日：2006-07-05

    申请人： TELEFONAKTIEBOLAGET LM ERICSSON (publ)

    发明人： LOMBARDI, Frank ,  FREED, John, G. ,  ISBERG, Martin

    IPC分类号： H04B1/50 ,  H04B1/40

    CPC分类号： H04B1/30 ,  H03C3/0966 ,  H03C3/0983 ,  H03C5/00 ,  H03L7/185 ,  H03L7/1974 ,  H03L7/23

    摘要： A method and apparatus for direct-conversion transmission generates a first frequency signal that is non-harmonically related to a transmit frequency signal, divides the first frequency signal to obtain a mixing frequency signal, divides the first frequency signal to obtain an intermediate frequency reference signal, generates the transmit frequency signal by using the mixing frequency signal to downconvert the transmit frequency signal into an intermediate frequency feedback signal, and phase-locks the intermediate frequency feedback signal to the intermediate frequency reference signal. The transmit frequency signal may be phase modulated, and may serve as an input to a saturated-mode power amplifier that can be configured for corresponding amplitude modulation. Alternatively, the un-modulated transmit frequency signal serves as the carrier signal input to a quadrature modulator, which imparts I/Q modulations to it, thereby producing a modulated carrier signal for input to a linear power amplifier.