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    METHOD AND APPARATUS FOR CALCULATING BIT LOG-LIKELIHOOD RATIOS FOR QAM SIGNALS
    1.
    发明专利
    METHOD AND APPARATUS FOR CALCULATING BIT LOG-LIKELIHOOD RATIOS FOR QAM SIGNALS 未知

    公开(公告)号：CA2373543C

    公开(公告)日：2005-08-02

    申请号：CA2373543

    申请日：2002-02-19

    Applicant: MOTOROLA INC

    Inventor： CORKE ROBERT JOHN ,  AGAMI GREGORY ,  ROTSTEIN RON

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

    Abstract: A method and apparatus to efficiently calculate log-likelihood ratios for ea ch bit within M-ary QAM modulated symbols transmitted in a communication system . The method and apparatus utilize characteristics of square Karnaugh mapping of the QAM symbol constellation in order to reduce the number of distance calculations needed to determine the log-likelihood ratios for each of the bits within a demodulated symbol. The reduction in the number of calculations affords significant reduction in the time needed to determine log-likelihood ratios, especially for higher order M-ary QAM systems.

    METHOD AND APPARATUS FOR CALCULATING BIT LOG-LIKELIHOOD RATIOS FOR QAM SIGNALS
    7.
    发明专利
    METHOD AND APPARATUS FOR CALCULATING BIT LOG-LIKELIHOOD RATIOS FOR QAM SIGNALS 未知

    公开(公告)号：CA2373543A1

    公开(公告)日：2002-09-12

    申请号：CA2373543

    申请日：2002-02-19

    Applicant: MOTOROLA INC

    Inventor： AGAMI GREGORY ,  CORKE ROBERT JOHN ,  ROTSTEIN RON

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

    Abstract: A method and apparatus to efficiently calculate log-likelihood ratios for ea ch bit within M-ary QAM modulated symbols transmitted in a communication system . The method and apparatus utilize characteristics of square Karnaugh mapping of the QAM symbol constellation in order to reduce the number of distance calculations needed to determine the log-likelihood ratios for each of the bits within a demodulated symbol. The reduction in the number of calculations affords significant reduction in the time needed to determine log-likelihood ratios, especially for higher order M-ary QAM systems.

    METHOD, APPARATUS AND SYSTEM FOR USE IN DETERMINING PILOT-TO-DATA POWER RATIO IN WIRELESS COMMUNICATION
    9.
    发明申请
    METHOD, APPARATUS AND SYSTEM FOR USE IN DETERMINING PILOT-TO-DATA POWER RATIO IN WIRELESS COMMUNICATION 审中-公开
    用于确定无线通信中的导频与数据功率比的方法，装置和系统

    公开(公告)号：WO2005006574A2

    公开(公告)日：2005-01-20

    申请号：PCT/US2004020970

    申请日：2004-06-29

    Applicant: MOTOROLA INC ,  AGAMI GREGORY ,  CORKE ROBERT JOHN ,  POWLEY GEORGE

    Inventor： AGAMI GREGORY ,  CORKE ROBERT JOHN ,  POWLEY GEORGE

    IPC: H03G3/00 ,  H04L25/02 ,  H04L27/38 ,  H04B

    CPC classification number: H04L27/3809 ,  H03G3/005 ,  H04L25/0214

    Abstract: A method, apparatus and system for use in determining a pilot-to-data power ratio by receiving a data symbol (122) having a data amplitude, receiving a pilot signal (124) having a pilot amplitude, reverse training (350) an automatic gain (154) based on the data amplitude and the pilot amplitude, and determining a pilot-to-data power ratio (250) according to the reverse training of the automatic gain. In some embodiments the method further compensates for channel fading in the data symbol by providing for channel correction (340) on the data symbol, providing for channel correction (344) on the pilot signal and dividing the channel corrected data symbol by the channel corrected pilot signal providing a fading compensated data symbol, where the fading compensated data symbol (150) is provided prior to reverse training such that the reverse training is based at least in part on the fading compensated data symbol.

    Abstract translation: 一种用于通过接收具有数据幅度的数据符号（122）来确定导频与数据功率比的方法，设备和系统，接收具有导频幅度的导频信号（124），反向训练（350），自动 基于数据幅度和导频幅度来增益（154），并且根据自动增益的反向训练来确定导频与数据功率比（250）。 在一些实施例中，该方法进一步通过对数据符号提供信道校正（340）来补偿数据符号中的信道衰落，提供对导频信号的信道校正（344）并且将信道校正的数据符号除以信道校正的导频 信号提供衰落补偿数据符号，其中衰落补偿数据符号（150）在反向训练之前提供，使得反向训练至少部分地基于衰落补偿数据符号。

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