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1. 发明申请

WO2005011220A1 CHANNEL ESTIMATION AND SEQUENCE ESTIMATION FOR THE RECEPTION OF OPTICAL SIGNAL 审中-公开
标题翻译：用于接收光信号的信道估计和序列估计
公开(公告)号：WO2005011220A1
公开(公告)日：2005-02-03
申请号：PCT/EP2004/007155
申请日：2004-07-01
申请人： COREOPTICS INC. , LANGENBACH, Stefan , STOJANOVIC, Nebojsa
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符号序列的模拟信号，从而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获得的。根据另一实施例，符号周期包括至少一个采样时间。计数事件，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来定义。模型分布适用于事件计数，并从拟合模型分布获得分支度量。此外，本发明涉及用于光接收机的相应符号检测器。

2. 发明申请

WO2011159540A1 METHOD AND CIRCUIT FOR BER ESTIMATION 审中-公开
标题翻译： BER估计的方法和电路
公开(公告)号：WO2011159540A1
公开(公告)日：2011-12-22
申请号：PCT/US2011/039709
申请日：2011-06-09
申请人： CISCO TECHNOLOGY, INC. , LANGENBACH, Stefan , STOJANOVIC, Nebojsa
发明人： LANGENBACH, Stefan , STOJANOVIC, Nebojsa
IPC分类号： H04L1/00 , H04L1/20
CPC分类号： H04L1/0054 , H04L1/20
摘要： This invention relates to a method and a circuit for estimating the bit error rate in a data transmission system. Symbols are detected (u) by a maximum likelihood detector (1 ), which provides path metrics of the decoded path and the best competitor at predetermined symbol positions. Absolute path metric differences (2) are calculated between the decoded path and the best competitor at said predetermined symbol positions. Events (5) are counted when an absolute path metric difference (2) is equal to one of a set of difference values. The bit error rate is estimated based on the number of counted (4) events (5). The invention further comprises a method and a circuit in which a function is applied onto said absolute path metric difference. The function maps quantized logarithms of probabilities to probabilities.
摘要翻译：本发明涉及用于估计数据传输系统中的误码率的方法和电路。通过最大似然检测器（1）检测符号（u），该最大似然检测器（1）在预定符号位置处提供解码路径和最佳竞争者的路径度量。在解码路径和所述预定符号位置处的最佳竞争者之间计算绝对路径度量差（2）。当绝对路径度量差（2）等于一组差值中的一个时，计数事件（5）。基于计数（4）事件的数量估计误码率（5）。本发明还包括其中将功能应用于所述绝对路径量度差的方法和电路。该函数将概率的量化对数映射到概率。

3. 发明申请

WO2004071002A1 ERROR RATE ESTIMATION METHOD FOR A RECEIVER AND RECEIVER APPARATUS 审中-公开
标题翻译：接收器和接收器装置的误差估计方法
公开(公告)号：WO2004071002A1
公开(公告)日：2004-08-19
申请号：PCT/EP2004/000909
申请日：2004-02-02
申请人： COREOPTICS GMBH , LANGENBACH, Stefan , STOJANOVIC, Nebojsa , BOECKER, Ulrich
发明人： LANGENBACH, Stefan , STOJANOVIC, Nebojsa , BOECKER, Ulrich
IPC分类号： H04L1/20
CPC分类号： H04L1/0054 , H04L1/20
摘要： This invention relates to a method for a receiver. The method comprises receiving a sequence of symbols. Further an unreliable detection event is determined, if the absolute value of a difference between a first metric for a first event minus a second metric for a second event is lower than a predetermined threshold. Moreover a receiver is provided, the receiver comprising a metric generator for generating a first and a second metric, and an unreliability detector for detecting an unreliable detection event.
摘要翻译：本发明涉及一种接收机的方法。该方法包括接收符号序列。此外，如果第一事件的第一度量减去第二事件的第二度量之间的差的绝对值低于预定阈值，则确定不可靠的检测事件。此外，提供接收机，接收机包括用于产生第一和第二度量的度量发生器，以及用于检测不可靠检测事件的不可靠性检测器。

4. 发明申请

WO2011156124A1 METHODS FOR OBTAINING A SET OF PATH METRICS AND EQUALIZER FOR A RECEIVER FOR DIGITAL DATA 审中-公开
标题翻译：用于获取数字数据接收器的路径度量和均衡器的方法
公开(公告)号：WO2011156124A1
公开(公告)日：2011-12-15
申请号：PCT/US2011/037531
申请日：2011-05-23
申请人： CISCO TECHNOLOGY, INC. , LANGENBACH, Stefan , STOJANOVIC, Nebojsa
发明人： LANGENBACH, Stefan , STOJANOVIC, Nebojsa
IPC分类号： H04L25/03
CPC分类号： H04L25/03178 , H04L25/03248
摘要： This invention relates to methods for obtaining a bin number of path metrics. When performing such methods, a histogram is provided, which comprises a bin number of values, a maximum value and a tail region left or right of the maximum value. A bin number of path metrics is obtained from said values. According to an embodiment a local extremum is removed from said tail region. According to another embodiment the tail region is forced to be convex. According to a further embodiment a maximum metric difference between neighboring metrics is ensured.
摘要翻译：本发明涉及获取路数量度的箱数的方法。当执行这种方法时，提供直方图，其包括最大值的左边或右边的值的数量，最大值和尾部区域。从所述值获得二进制数的路径度量。根据实施例，从所述尾部区域移除局部极值。根据另一个实施例，尾部区域被迫凸起。根据另一实施例，确保相邻度量之间的最大度量差异。

5. 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。

6. 发明申请

WO2004098051A1 METHOD AND CIRCUIT FOR CONTROLLING AMPLIFICATION 审中-公开
标题翻译：用于控制放大的方法和电路
公开(公告)号：WO2004098051A1
公开(公告)日：2004-11-11
申请号：PCT/EP2004/004337
申请日：2004-04-23
申请人： COREOPTICS INC. , LANGENBACH, Stefan , STOJANOVIC, Nebojsa
发明人： LANGENBACH, Stefan , STOJANOVIC, Nebojsa
IPC分类号： H03G3/30
CPC分类号： H03G3/3078 , H03G3/001 , H03G3/3052 , H03G3/3068 , H03M1/185
摘要： This invention relates to a method for controlling an amplification within a receiver. The gain of a variable gain amplifier which amplifies an input signal to obtain a gain-controlled signal is set. Said gain controlled signal is analog-to-digital converted. Thereby digital words are generated. Each digital word has a value out of a plurality of possible digital values. Digital words having a value within a first and a second subset of the possible digital values are counted in order to generate a first and a second counter value. The gain is set in accordance with the first and second counter values in a fashion that all counter values are as equal as possible. Furthermore, this invention is related to a circuit to be used within a receiver for adjusting the gain of a variable gain amplifier in order to ensure a proper analog-to-digital conversion.
摘要翻译：本发明涉及一种用于控制接收机内的放大的方法。设置放大输入信号以获得增益控制信号的可变增益放大器的增益。所述增益控制信号被模数转换。从而产生数字字。每个数字字都具有多个可能的数字值中的值。对具有可能的数字值的第一和第二子集内的值的数字字进行计数，以产生第一和第二计数器值。按照所有计数器值尽可能相等的方式，根据第一和第二计数器值设置增益。此外，本发明涉及用于调节可变增益放大器的增益的接收机内使用的电路，以便确保适当的模数转换。

7. 发明申请

WO2004077737A1 SELF-TIMING METHOD FOR ADJUSTMENT OF A SAMPLING PHASE IN AN OVERSAMPLING RECEIVER AND CIRCUIT 审中-公开
标题翻译：自调节接收机和电路中采样相位的自适应方法
公开(公告)号：WO2004077737A1
公开(公告)日：2004-09-10
申请号：PCT/EP2004/001838
申请日：2004-02-25
申请人： COREOPTICS INC. , LANGENBACH, Stefan , STOJANOVIC, Nebojsa
发明人： LANGENBACH, Stefan , STOJANOVIC, Nebojsa
IPC分类号： H04L7/033
CPC分类号： H04L7/0054
摘要： This invention discloses a self-timing method for phase adjustment. An analog signal is digitized at a first and second phase with respect to the symbols comprised in an analog signal in order to obtain first and second quantized samples. Then a first counter out of a first plurality of counters is increased if said first quantized sample has a first digital value to which said first counter is associated. Moreover a second counter out of a second plurality of counters is increased if a second quantized sample has a second digital value to which the second counter is associated. Finally the sampling phase is adjusted based on the values of the counters of the first and second plurality of counters. Moreover a digitizing, self-timing circuit is disclosed.
摘要翻译：本发明公开了一种用于相位调整的自定时方法。相对于包含在模拟信号中的符号，模拟信号在第一和第二相位被数字化，以便获得第一和第二量化样本。然后，如果所述第一量化样本具有与所述第一计数器相关联的第一数字值，则第一多个计数器中的第一计数器增加。此外，如果第二量化样本具有与第二计数器相关联的第二数字值，则第二多个计数器中的第二计数器增加。最后，基于第一和第二多个计数器的计数器的值来调整采样相位。此外，公开了数字化，自定时电路。

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