发明申请
US20050193318A1 Adaptive waveform equalization for viterbi-decodable signal and signal quality evaluation of viterbi-decodable signal
有权
维特比可解码信号的自适应波形均衡和维特可解码信号的信号质量评估
- 专利标题: Adaptive waveform equalization for viterbi-decodable signal and signal quality evaluation of viterbi-decodable signal
- 专利标题(中): 维特比可解码信号的自适应波形均衡和维特可解码信号的信号质量评估
-
申请号: US10625853申请日: 2003-07-22
-
公开(公告)号: US20050193318A1公开(公告)日: 2005-09-01
- 发明人: Tetsuya Okumura , Shigemi Maeda
- 申请人: Tetsuya Okumura , Shigemi Maeda
- 专利权人: Sharp Kabushiki Kaisha
- 当前专利权人: Sharp Kabushiki Kaisha
- 优先权: JP2002-220199 20020729; JP2002-223092 20020731
- 主分类号: G11B20/10
- IPC分类号: G11B20/10 ; H03M13/03 ; H04L25/03
摘要:
The waveform equalizing device includes: an FIR filter for generating an equalized signal pattern y(i, n) on the basis of equalization of a waveform of the reproduced signal pattern u(i, n); a Viterbi decoding circuit for detecting a path metric difference s(n) between a correct path determined as a survivor path and an error path which fails to survive the correct path in Viterbi decoding based on the equalized signal pattern y(i, n); a target register for setting a target value ds for the path metric difference s(n); and a tap coefficients update circuit for adapting the equalization according to an error of the detected path metric difference from the target value. The tap coefficients update circuit adapts equalization properties so that the mean square error is minimized, thereby achieving a satisfactory result in lowering the error rate.