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    METHOD AND DEVICE FOR CALCULATING LOG LIKELIHOOD RATIO OF BITS IN QAM SIGNALS
    1.
    发明专利
    METHOD AND DEVICE FOR CALCULATING LOG LIKELIHOOD RATIO OF BITS IN QAM SIGNALS 审中-公开

    公开(公告)号：JP2002330188A

    公开(公告)日：2002-11-15

    申请号：JP2002061556

    申请日：2002-03-07

    Applicant: MOTOROLA INC

    Inventor： AGAMI GREGORY ,  CORKE ROBERT J ,  ROTSTEIN RON

    IPC: H04L27/34 ,  H04L25/06 ,  H04L27/38

    Abstract: PROBLEM TO BE SOLVED: To provide a method and device for effectively calculating log likeli hood ratio on each bit in M-aryQAM modulated signals transmitted in a commu nication system, in order to reduce the time for calculating log likelihood ratio. SOLUTION: This method and device uses characteristics of the square Carnot mapping in QAM code set in order to reduce the number of distance calculation needed in determining log likelihood ratio on each bit in M-aryQAM modulated signals. The reduction of number of the calculation reduces the much more time needed in determining the log likelihood ratio, especially in the case of higher order M-aryQAM system.

    Method and apparatus for reference symbol aided channel estimation
    2.
    发明专利
    Method and apparatus for reference symbol aided channel estimation 未知

    公开(公告)号：GB2440296A

    公开(公告)日：2008-01-23

    申请号：GB0721495

    申请日：2006-03-31

    Applicant: MOTOROLA INC ,  JASPER STEVEN C ,  CORKE ROBERT J ,  FRANK COLIN D ,  MAKHLOUF ISAM R

    Inventor： JASPER STEVEN C ,  CORKE ROBERT J ,  FRANK COLIN D ,  MAKHLOUF ISAM R

    IPC: H04L25/03 ,  H04L27/26

    Abstract: A system that includes a receiver (100) that is configured for: selecting (210) a set of demodulator output samples and a corresponding set of reference symbols; generating (220) a set of raw channel estimates based on the set of demodulator output samples and the corresponding set of reference symbols; subdividing (230) the set of raw channel estimates into a plurality of subsets; assigning and applying (240) a corresponding reference symbol magnitude quantization scheme to each subset; determining (250) a set of filter coefficients that is based on the quantization schemes applied to the subsets of raw channel estimates; and combining (260) the set of raw channel estimates with the set of filter coefficients to generate a channel estimate.

    3.
    发明专利
    未知

    公开(公告)号：DE10035062A1

    公开(公告)日：2001-03-01

    申请号：DE10035062

    申请日：2000-07-17

    Applicant: MOTOROLA INC

    Inventor： ROTSTEIN RON ,  CORKE ROBERT J ,  PRYSBY DANIEL G ,  LUZ YEHUDA

    IPC: H04B1/16 ,  H04B7/26 ,  H04L29/00 ,  H04M1/73 ,  H04W52/02 ,  H04Q7/20 ,  H04Q7/32 ,  H04M19/04 ,  H04B1/38 ,  H04B7/204 ,  H04B1/76 ,  H04B7/216

    Abstract: A method of reducing power consumption in a communication device includes a step of acquiring a signal on a common pilot channel of a radio communication system. A next step includes detecting predetermined bits in the signal on the common pilot channel indicating activity on paging channels of the radio communication system. When no paging channel activity is indicated in the second step, a last step includes powering down portions of the electrical circuitry of the communication device so as to reduce power consumption, and when paging channel activity is indicated in the second step, a next step includes powering up portions of the electrical circuitry of the communication device such that those paging channels indicating activity are monitored by the communication device.

    SYSTEM AND METHOD FOR DEMODULATING DATA IN AN ORTHOGONAL FREQUENCY DIVISION MODULATION SYSTEM
    7.
    发明申请
    SYSTEM AND METHOD FOR DEMODULATING DATA IN AN ORTHOGONAL FREQUENCY DIVISION MODULATION SYSTEM 审中-公开
    用于在正交频分调制系统中解调数据的系统和方法

    公开(公告)号：WO2008085594A2

    公开(公告)日：2008-07-17

    申请号：PCT/US2007083119

    申请日：2007-10-31

    Applicant: MOTOROLA INC ,  FRANK COLIN D ,  CONRAD ALAN P ,  CORKE ROBERT J ,  SEOANE JORGE L

    Inventor： FRANK COLIN D ,  CONRAD ALAN P ,  CORKE ROBERT J ,  SEOANE JORGE L

    IPC: H04Q7/00

    CPC classification number: H04L27/2662 ,  H04L25/0212 ,  H04L25/022 ,  H04L25/0228 ,  H04L27/2675

    Abstract: First incoming data comprising at least one OFDM symbol is received (302). A plurality of timing relationships is determined and each of the plurality of timing relationships relates to an alignment window of a fast Fourier transform (FFT) (304). Each of the plurality of timing relationships is applied to the first incoming data (306) and a plurality of achievable interference metrics associated with the first incoming data is responsively determined (308). Each of the plurality of achievable interference metrics is associated with a selected one of the plurality of timing relationships. The preferred interference metric is chosen from amongst the plurality of achievable interference metrics.

    Abstract translation: 包括至少一个OFDM符号的第一输入数据被接收（302）。 确定多个定时关系并且多个定时关系中的每一个与快速傅立叶变换（FFT）的对准窗口相关（304）。 多个定时关系中的每一个被应用于第一输入数据（306），并响应地确定与第一输入数据相关联的多个可实现的干扰度量（308）。 多个可实现的干扰度量中的每一个与多个定时关系中的选定的一个关联。 优选的干扰度量是从多个可实现的干扰度量中选择的。

    METHOD FOR PROVIDING POINT-TO-POINT ENCRYPTION IN A COMMUNICATION SYSTEM
    8.
    发明专利
    METHOD FOR PROVIDING POINT-TO-POINT ENCRYPTION IN A COMMUNICATION SYSTEM 未知

    公开(公告)号：CA2532353C

    公开(公告)日：2011-09-06

    申请号：CA2532353

    申请日：2004-07-16

    Applicant: MOTOROLA INC

    Inventor： SILVERMAN SHMUEL ,  CORKE ROBERT J ,  ROTSTEIN RON

    IPC: H04L9/00 ,  H04L1/16 ,  H04L1/18 ,  H04L9/08 ,  H04L9/12 ,  H04L9/28 ,  H04L12/56 ,  H04W12/00 ,  H04W84/12

    Abstract: A transmitting device (100) transmits a first packet, comprising a second encryption vector that is encrypted using a first encryption vector. The transmitting device (100) transmits a second packet that is encrypted using the second encryption vector if an acknowledgement message is received within a predetermined time after transmitting the first packet; otherwise, the first packet is re-transmitted. Upon receipt of the first packet, a receiving device (102) decrypts the first packet using the first encryption vector and transmits the acknowledgement message. Upon receipt of the second packet; the receiving device (102) attempts to decrypt a portion of the second packet using the first and second encryption vectors. If the portion of the second packet was successfully decrypted using the first encryption vector, the receiving device (102) re-transmits the acknowledgement message for the first packet; otherwise, it transmits an acknowledgement message for the second packet.

    Channel estimation using a minimized channel prediction interval
    10.
    发明专利
    Channel estimation using a minimized channel prediction interval 未知

    公开(公告)号：GB2440094A

    公开(公告)日：2008-01-16

    申请号：GB0722373

    申请日：2006-03-31

    Applicant: MOTOROLA INC

    Inventor： FRANK COLIN D ,  CORKE ROBERT J ,  JASPER STEVEN C ,  MAKHLOUF ISAM R

    IPC: H04L25/02 ,  H04L27/26

    Abstract: A receiver (300) configured for: a) receiving (410) a first OFDM symbol and generating a plurality of demodulated symbols (306) for the first OFDM symbol: b) generating (420) decoder output code symbols (326) corresponding to a subset of the plurality of demodulated symbols; c) determining (430) that a set of (he decoder output code symbols (326) make up a set of reference symbols corresponding to at least a portion of the subset of the plurality of demodulated symbols (306); d) generating (440) the set of reference symbols; e) generating (450) a set of channel estimates (362) based on the set of reference symbols and the at least a portion of the subset of the plurality of demodulated symbols, for use in decoding a current OFDM symbol; and f) repeating steps b- e until a channel estimate for each demodulated symbol corresponding to the first OFDM symbol has been generated.

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