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.

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.

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.

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。

公开(公告)号：EP1645060A4

公开(公告)日：2008-12-03

申请号：EP04756402

申请日：2004-06-29

Applicant: MOTOROLA INC

Inventor： AGAMI GREGORY ,  CORKE ROBERT JOHN ,  POWLEY GEORGE

IPC: H04J13/04 ,  H03G3/00 ,  H04L25/02 ,  H04L27/38

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.