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1. 发明申请

WO2005011220A8 CHANNEL ESTIMATION AND SEQUENCE ESTIMATION FOR THE RECEPTION OF OPTICAL SIGNAL 审中-公开
标题翻译：光信号接收的信道估计和序列估计
公开(公告)号：WO2005011220A8
公开(公告)日：2005-03-24
申请号：PCT/EP2004007155
申请日：2004-07-01
申请人： LANGENBACH STEFAN , STOJANOVIC NEBOJSA , COREOPTICS INC
发明人： LANGENBACH STEFAN , STOJANOVIC NEBOJSA
IPC分类号： H04L25/03
CPC分类号： H04L25/03197 , H04L7/0004 , H04L7/007
摘要： The application relates to channel estimation. The method comprises digitizing an analogue signal representing a sequence of symbols thereby associating one digital word with the level of said analogue signal at each sampling time. The most likely sequence of symbols is detected. To this end branch metrics are provided. According to one embodiment, a symbol period comprises at least two sampling times. Moreover the branch metrics are obtained from frequencies of digital words resulting from a digitizing and the symbols of the most likely sequence. According to another embodiment a symbol period comprises at least one sampling time. Events are counted wherein each event is defined by a channel state and a current digital word. Each channel state is defined by a pattern of symbols relative to a current symbol determined at the time of a current digital word. A model distribution is fitted to event counts and a branch metrics is obtained from the fitted model distribution. Moreover the invention relates to corresponding symbol detectors for optical receivers.
摘要翻译：该应用涉及信道估计。该方法包括数字化表示一系列符号的模拟信号，由此在每个采样时间将一个数字字与所述模拟信号的电平相关联。检测到最可能的符号序列。为此提供了分支指标。根据一个实施例，符号周期包括至少两个采样时间。此外，分支度量是从数字化产生的数字字的频率和最可能的序列的符号中获得的。根据另一个实施例，符号周期包括至少一个采样时间。事件被计数，其中每个事件由信道状态和当前数字字定义。每个信道状态由相对于当前数字字时确定的当前符号的符号模式定义。模型分布符合事件计数，分支度量从拟合模型分布中获得。此外，本发明涉及用于光接收机的对应符号检测器。

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