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    A transmitter splits a signal into a plurality of sub-signals, each containing a plurality of sub-carriers, and amplifies each sub-signal separately.
    1.
    发明专利
    A transmitter splits a signal into a plurality of sub-signals, each containing a plurality of sub-carriers, and amplifies each sub-signal separately. 未知

    公开(公告)号：GB2428168A

    公开(公告)日：2007-01-17

    申请号：GB0513752

    申请日：2005-07-06

    Applicant: MOTOROLA INC

    Inventor： SHIRAZI GADI ,  FRIEDLANDER HAIM ,  LUZZATTO ARIEL ,  SERAFY SALOMON

    IPC: H04L27/26

    Abstract: An RF transmitter (200) including means (201) for generating a multi-carrier modulation signal comprising a plurality of sub-carriers, means (309 fig 3) for modulating an RF carrier signal (c(t)) with the sub-carriers of the multi-carrier modulation signal to produce a modulated signal, a signal splitter (305 fig 3) to split a signal including the sub-carriers of the multi-carrier modulation signal into a plurality of sub-signals each including a sub-set of the plurality of sub-carriers, a plurality of power amplifiers (203) each operable to amplify a separate one of the sub-signals to produce an amplified sub-signal and an RF power combiner (205) operable to combine the amplified sub-signals for transmission as a combined amplified RF signal. The invention may be used for OFDM transmission. It reduces the peak-to-average power ratio (PAPR).

    Distance measurement between wireless terminals in an OFDM system
    3.
    发明专利
    Distance measurement between wireless terminals in an OFDM system 未知

    公开(公告)号：GB2405276A

    公开(公告)日：2005-02-23

    申请号：GB0319703

    申请日：2003-08-21

    Applicant: MOTOROLA INC

    Inventor： LUZZATTO ARIEL ,  SERFATY SALOMON

    IPC: A63F13/12 ,  G01S1/02 ,  G01S5/14 ,  G01S11/02 ,  G01S11/06 ,  H04L27/26 ,  H04L29/06

    Abstract: A means for determining the distance between a first and second wireless communication terminal is disclosed whereby a first terminal receives a signal comprising a composite multipath derivative of an orthogonal frequency division multiplexed signal transmitted by a second terminal. The received signal 109 is demodulated 202 and resolved into a plurality of components corresponding to different path length components in the received signal and the component corresponding to the shortest path length is identified 212. For the identified component, the time of travel from the second terminal to the first terminal is determined 213. The first terminal may further determine a strength value for each of the resolved components. Each strength value may be compared with a threshold value to determine if a strength value is considered to be non-zero such that only components having non-zero strength values are included when determining the component having the shortest path length. The signal transmitted by the second terminal and received in a multipath derivative form by the first terminal may be a physical layer convergence procedure PLCP training signal. The terminals may be part of a local area network wherein the first terminal may comprise an access point terminal AP and the second terminal may comprise a remote unit terminal RU.

    Broadband power amplifier and impedance matching circuit
    4.
    发明专利
    Broadband power amplifier and impedance matching circuit 未知

    公开(公告)号：GB2420923A

    公开(公告)日：2006-06-07

    申请号：GB0425146

    申请日：2004-11-15

    Applicant: MOTOROLA INC

    Inventor： SHIRAZI GADI ,  LUZZATTO ARIEL

    IPC: H04B1/04 ,  H03F1/56 ,  H03H11/30 ,  H03J5/24

    Abstract: An amplifier circuit 100 for use in a radio transmitter includes an RF power amplifier 101 and impedance matching means 117 and 119 for matching the input and output impedances of the power amplifier in a number of frequency bands. The amplifier 100 has an operational bandwidth greater than a decade, e.g. from 30MHz to 512MHz. The impedance matching means 117 and 119 each comprise a single LC section comprising switchable shunt capacitors (e.g. 181 - 189) and switchable series inductors (e.g. 161 - 169). The switches may be PIN diodes or FETs. A design algorithm for selecting the band start and end frequencies is disclosed; Q is maintained constant across all bands. The algorithm allows selection of component values so that a multi-octave frequency range may be covered by the single-section configuration.

    Circuits for use in radio communications
    5.
    发明专利
    Circuits for use in radio communications 未知

    公开(公告)号：GB2413444A

    公开(公告)日：2005-10-26

    申请号：GB0408831

    申请日：2004-04-21

    Applicant: MOTOROLA INC

    Inventor： LUZZATTO ARIEL ,  FRIEDLANDER HAIM ,  SHIRAZI GADI

    IPC: H03L7/087 ,  H03L7/113 ,  H03L7/18 ,  H03L7/185 ,  H03L7/20

    Abstract: A frequency synthesiser circuit for use in wireless communications including a phase locked loop including a VCO (voltage controlled oscillator), wherein the synthesiser circuit includes a further oscillator which in operation is a free running oscillator at a frequency higher than the VCO and a mixer connected to receive input signals from the VCO and from the further oscillator and to combine such signals. Also described is a wireless communications transmitter or receiver incorporating the frequency synthesiser circuit.

    7.
    发明专利
    未知

    公开(公告)号：DE112004001544T5

    公开(公告)日：2006-06-29

    申请号：DE112004001544

    申请日：2004-06-29

    Applicant: MOTOROLA INC

    Inventor： LUZZATTO ARIEL ,  SERFATY SALOMON

    IPC: H04Q7/00 ,  A63F13/12 ,  G01S1/02 ,  G01S5/14 ,  G01S11/02 ,  G01S11/06 ,  H04L27/26 ,  H04L29/06

    Abstract: A method of estimating the distance between a first wireless communication terminal and a second wireless communication terminal includes: receiving a signal at the first terminal, processing the received signal including performing a demodulation operation to produce a demodulated signal; and resolving the demodulated signal into a plurality of components corresponding to different path length components included in the received signal; identifying which of the resolved components corresponds to a shortest path length; and for the identified component, computing a time of travel from the second terminal to the first terminal.

    CIRCUITS FOR USE IN RADIO COMMUNICATIONS
    8.
    发明专利
    CIRCUITS FOR USE IN RADIO COMMUNICATIONS 未知

    公开(公告)号：CA2562752A1

    公开(公告)日：2005-11-10

    申请号：CA2562752

    申请日：2005-04-19

    Applicant: MOTOROLA INC

    Inventor： SHIRAZI GADI ,  LUZZATTO ARIEL ,  FRIEDLANDER HAIM

    IPC: H03L7/087 ,  H03L7/113 ,  H03L7/18 ,  H03L7/185 ,  H03L7/20

    Abstract: A frequency synthesiser circuit for use in wireless communications including a phase locked loop including a VCO (voltage controlled oscillator), wherein t he synthesiser circuit includes a further oscillator which in operation is a fr ee running oscillator at a frequency higher than the VCO and a mixer connected to receive input signals from the VCO and from the further oscillator and to combine such signals. Also described is a wireless communications transmitte r or receiver incorporating the frequency synthesiser circuit.

    Measuring distance using wireless communication
    9.
    发明专利
    Measuring distance using wireless communication 未知

    公开(公告)号：GB2405276B

    公开(公告)日：2005-10-12

    申请号：GB0319703

    申请日：2003-08-21

    Applicant: MOTOROLA INC

    Inventor： LUZZATTO ARIEL ,  SERFATY SALOMON

    IPC: A63F13/12 ,  G01S1/02 ,  G01S5/14 ,  G01S11/02 ,  G01S11/06 ,  H04L27/26 ,  H04L29/06

    Abstract: A method of estimating the distance between a first wireless communication terminal and a second wireless communication terminal includes: receiving a signal at the first terminal, processing the received signal including performing a demodulation operation to produce a demodulated signal; and resolving the demodulated signal into a plurality of components corresponding to different path length components included in the received signal; identifying which of the resolved components corresponds to a shortest path length; and for the identified component, computing a time of travel from the second terminal to the first terminal.

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