发明申请
- 专利标题: DIGITAL SIGNAL PROCESSING APPARATUS
- 专利标题(中): 数字信号处理设备
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申请号: US13983233申请日: 2012-02-07
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公开(公告)号: US20130308960A1公开(公告)日: 2013-11-21
- 发明人: Kengo Horikoshi , Etsushi Yamazaki , Takayuki Kobayashi , Eiji Yoshida , Yutaka Miyamoto
- 申请人: Kengo Horikoshi , Etsushi Yamazaki , Takayuki Kobayashi , Eiji Yoshida , Yutaka Miyamoto
- 申请人地址: JP Tokyo
- 专利权人: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- 当前专利权人: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
- 当前专利权人地址: JP Tokyo
- 优先权: JP2011-024022 20110207
- 国际申请: PCT/JP2012/052724 WO 20120207
- 主分类号: H04B1/10
- IPC分类号: H04B1/10
摘要:
A parameter of an adaptive filter is optimized so that inter-symbol interference having an amount corresponding to an inserted fixed filter remains. A digital signal processing apparatus which is included in an optical signal receiver and processes a digital signal converted from an optical signal is provided with: a linear adaptive filter which applies a dynamically controllable linear transfer function to the digital signal; a maximum likelihood sequence decoder which applies a transfer function of a transmission-path model to a plurality of signal sequence candidates to generate a plurality of reference signals, and decodes a reception signal using maximum likelihood sequence estimation which evaluates the differences between an output signal of the linear adaptive filter and the reference signals to estimate the most likely transmission time sequence; a signal regenerator which generates a signal corresponding to decoded data from the maximum likelihood sequence decoder; a feedback distortion adding filter which adds distortion that is equivalent to the transmission-path model used in the maximum likelihood sequence decoder to an output signal of the signal regenerator; and an adaptive equalization filter control block which updates a tap coefficient of the linear adaptive filter in accordance with an LMS algorithm using the difference between a target signal that is an output signal of the feedback distortion adding filter and the digital signal as an error signal.
公开/授权文献
- US08977141B2 Digital signal processing apparatus 公开/授权日:2015-03-10