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1. 发明授权

US07324591B2 Adaptive equalizer 有权
标题翻译：自适应均衡器
公开(公告)号：US07324591B2
公开(公告)日：2008-01-29
申请号：US10919997
申请日：2004-08-17
申请人： Mark Fimoff , Sreenivasa M. Nerayanuru , Sedar Ozen
发明人： Mark Fimoff , Sreenivasa M. Nerayanuru , Sedar Ozen
IPC分类号： H04H7/30
CPC分类号： H04L25/0212 , H04L25/0226 , H04L25/03057 , H04L2025/03503 , H04L2025/03617
摘要： A channel impulse response is determined from a cross-correlation of a received training sequence and a stored version of the transmitted training sequence. The channel impulse response is iteratively cleansed of noise caused by the finiteness of the cross-correlation. Initial values of the tap weights for the taps of an equalizer such as a decision feedback equalizer may be determined based on the cleansed channel impulse response.
摘要翻译：信道脉冲响应是根据所接收的训练序列和已发送训练序列的存储版本的互相关来确定的。信道脉冲响应被迭代地清除由互相关的有限性引起的噪声。可以基于净化的信道脉冲响应来确定诸如判决反馈均衡器的均衡器的抽头的抽头权重的初始值。

2. 发明授权

US08320442B2 Channel impulse response estimating decision feedback equalizer 有权
标题翻译：信道脉冲响应估计判决反馈均衡器
公开(公告)号：US08320442B2
公开(公告)日：2012-11-27
申请号：US10911282
申请日：2004-08-04
申请人： Bruno Amizic , Mark Fimoff , Jin Kim , Sreenivasa M. Nerayanuru
发明人： Bruno Amizic , Mark Fimoff , Jin Kim , Sreenivasa M. Nerayanuru
IPC分类号： H03H7/30
CPC分类号： H04L25/03057 , H04L2025/03382 , H04L2025/0349
摘要： A decision feedback equalizer is operated by making first symbol decisions from an output of the decision feedback equalizer such that the first symbol decisions are characterized by a relatively long processing delay, by making second symbol decisions from the output of the decision feedback equalizer such that the second symbol decisions are characterized by a relatively short processing delay, and by determining tap weights for the decision feedback equalizer based on the first and second symbol decisions. The first symbol decisions may be derived from the output of a long traceback trellis decoder. The second symbol decisions may be derived either from the output of a short traceback trellis decoder or from shorter delay outputs of the long traceback trellis decoder.
摘要翻译：通过从所述判决反馈均衡器的输出进行第一符号判定来操作判定反馈均衡器，以便通过从所述判决反馈均衡器的输出进行第二符号判定，使得所述第一符号判定由相对长的处理延迟表征，使得第二符号决定的特征在于相对短的处理延迟，并且通过基于第一和第二符号决定确定用于判决反馈均衡器的抽头权重。第一符号决定可以从长跟踪网格解码器的输出中导出。第二符号决定可以从短跟踪网格解码器的输出或长跟踪网格解码器的较短延迟输出中导出。

3. 发明授权

US07688888B2 CIR estimating decision feedback equalizer with phase tracker 有权
标题翻译： CIR估计判决反馈均衡器与相位跟踪器
公开(公告)号：US07688888B2
公开(公告)日：2010-03-30
申请号：US11112610
申请日：2005-04-22
申请人： Tyler Brown , Mark Fimoff , Sreenivasa M. Nerayanuru , Gregory Tomezak
发明人： Tyler Brown , Mark Fimoff , Sreenivasa M. Nerayanuru , Gregory Tomezak
IPC分类号： H03H7/40
CPC分类号： H04L27/02 , H04L25/0212 , H04L25/0242 , H04L25/03057 , H04L25/03267
摘要： An output of an equalizer is decoded to produce first decoded data having a first accuracy. The output of the equalizer is further decoded to produce second decoded data having a second accuracy, and the second accuracy is greater than the first accuracy. Tap weights for the equalizer are calculated using the first and second decoded data. The calculated tap weights are applied to the taps of the equalizer.
摘要翻译：解码均衡器的输出以产生具有第一精度的第一解码数据。均衡器的输出被进一步解码以产生具有第二精度的第二解码数据，并且第二精度大于第一精度。使用第一和第二解码数据计算均衡器的抽头权重。计算出的抽头权重应用于均衡器的抽头。

4. 发明授权

US07382828B2 Channel impulse response (CIR) estimating decision feedback equalizer with phase tracker 有权
标题翻译：信道脉冲响应（CIR）估计具有相位跟踪器的判决反馈均衡器
公开(公告)号：US07382828B2
公开(公告)日：2008-06-03
申请号：US11114573
申请日：2005-04-26
申请人： Bruno Amizic , Mark Fimoff , Sreenivasa M. Nerayanuru
发明人： Bruno Amizic , Mark Fimoff , Sreenivasa M. Nerayanuru
IPC分类号： H03H7/30
CPC分类号： H04L25/0212 , H04L25/03057 , H04L25/03203
摘要： An equalizer system includes an equalizer, first and second decoders, and a tap weight controller. The equalizer equalizes a received signal to provide an equalizer output. The first decoder is characterized by a first parallel output, and the first decoder decodes the equalizer output to provide first symbol decisions having a first accuracy. The second decoder is characterized by a second parallel output, the second decoder receives the first parallel output and decodes the equalizer output to provide second symbol decisions having a second accuracy, the first accuracy is greater than the second accuracy, and the second decoder applies the second parallel output to the equalizer. The tap weight controller determines tap weights based on the first symbol decisions and supplies the tap weights to the equalizer.
摘要翻译：均衡器系统包括均衡器，第一和第二解码器以及抽头加权控制器。均衡器对接收到的信号进行均衡以提供均衡器输出。第一解码器的特征在于第一并行输出，并且第一解码器解码均衡器输出以提供具有第一精度的第一符号决定。第二解码器的特征在于第二并行输出，第二解码器接收第一并行输出并解码均衡器输出以提供具有第二精度的第二符号决定，第一精度大于第二精度，第二解码器应用第二并行输出到均衡器。抽头重量控制器基于第一符号决定确定抽头权重，并将抽头权重提供给均衡器。

5. 发明授权

US07382826B2 Method and apparatus for the control of a decision feedback equalizer 有权
标题翻译：用于控制决策反馈均衡器的方法和装置
公开(公告)号：US07382826B2
公开(公告)日：2008-06-03
申请号：US10766742
申请日：2004-01-27
申请人： Mark Fimoff , Sreenivasa M. Nerayanuru
发明人： Mark Fimoff , Sreenivasa M. Nerayanuru
IPC分类号： H03H7/30 , H04L25/03 , H04B3/14
CPC分类号： H04L25/03057 , H04L25/03267 , H04L2025/03382 , H04L2025/0349 , H04L2025/03605 , H04L2025/03726 , H04N5/211 , H04N5/4401
摘要： Input data segments of received symbols are continuously stored in a decision feedback equalizer buffer at a symbol rate S. Output data sections of received symbols are supplied from the decision feedback equalizer buffer at an output rate of nS such that void times separate the output data sections, and n>1. The received symbols supplied by the decision feedback equalizer buffer are equalized in a decision feedback equalizer to provide equalized symbols; and the equalized symbols are decoded by a decoder to provide decoded symbols. Adjustments for the decision feedback equalizer are calculated during the void times such that the adjustments are calculated based on both the received symbols supplied by the decision feedback equalizer buffer and the decoded symbols. The adjustments are applied to the decision feedback equalizer.
摘要翻译：接收到的符号的输入数据段以符号率S连续地存储在判定反馈均衡器缓冲器中。接收符号的输出数据部分以nS的输出速率从判决反馈均衡器缓冲器提供，使得空闲时间将输出数据部分，n> 1。由判决反馈均衡器缓冲器提供的接收符号在判决反馈均衡器中被均衡以提供均衡的符号; 并且均衡符号由解码器解码以提供解码的符号。在空闲时间期间计算用于判决反馈均衡器的调整，使得基于由判决反馈均衡器缓冲器和解码符号提供的接收符号两者来计算调整。调整应用于判决反馈均衡器。

6. 发明授权

US07110447B2 Channel estimator for an adaptive equalizer 有权
公开(公告)号：US07110447B2
公开(公告)日：2006-09-19
申请号：US10142108
申请日：2002-05-09
申请人： Mark Fimoff , Sreenivasa M. Nerayanuru , Sedar Ozen
发明人： Mark Fimoff , Sreenivasa M. Nerayanuru , Sedar Ozen
IPC分类号： H03H7/30 , H04B1/69
CPC分类号： H04L25/0236 , H04L25/0212 , H04L25/0226 , H04L25/025 , H04L2025/03382 , H04L2025/03477 , H04L2025/03605 , H04L2025/03617 , H04L2025/03726 , H04L2025/03789
摘要： An impulse response of a channel is estimated by cross-correlating a known training signal with a received training signal to produce a cross-correlation vector. The cross-correlation vector is characterized by a known noise component resulting from the finiteness of the correlation. A correction vector is estimated based on the known training signal, where the correction vector is related to the noise component. Truncated representations of the correction vector are iteratively subtracted from the cross-correlation vector in order to produce a succession of cross-correlation outputs of increased accuracy. When the cross-correlation output is sufficiently accurate, it may be used to determine the weights to be given to the taps of an equalizer.

7. 发明申请

US20150249560A1 SYSTEM AND METHOD FOR FSK DEMODULATION 有权
标题翻译：用于FSK解调的系统和方法
公开(公告)号：US20150249560A1
公开(公告)日：2015-09-03
申请号：US14193189
申请日：2014-02-28
申请人： Khurram Waheed , Sreenivasa M. Nerayanuru
发明人： Khurram Waheed , Sreenivasa M. Nerayanuru
IPC分类号： H04L27/10 , H04L27/14
CPC分类号： H04W4/80 , H04L27/0008 , H04L27/106 , H04L27/148
摘要： A system and method for frequency-selective demodulation is presented. An input signal is received that is modulated by frequency shift keying (FSK) and encodes data at a first and second frequency. The input signal is supplied to a plurality of estimators that include a first estimator configured to detect a first signal at the first frequency, a second estimator configured to detect a second signal at the second frequency, a third estimator configured to detect a third signal at a third frequency, and a fourth estimator configured to detect a fourth signal at a fourth frequency. An output is generated indicating receipt of the data encoded at the first frequency or the second frequency based upon outputs of the first estimator, the second estimator, the third estimator, and the fourth estimator.
摘要翻译：提出了一种用于频率选择解调的系统和方法。接收通过频移键控（FSK）调制的输入信号，并以第一和第二频率对数据进行编码。输入信号被提供给多个估计器，其包括被配置为检测第一频率的第一信号的第一估计器，被配置为检测第二频率的第二信号的第二估计器，被配置为检测第二信号的第三信号第三频率和第四估计器，被配置为以第四频率检测第四信号。产生指示基于第一估计器，第二估计器，第三估计器和第四估计器的输出以第一频率或第二频率编码的数据的接收的输出。

8. 发明授权

US07289580B2 Channel estimator using one or more correlation reference vectors to eliminate data related noise 有权
标题翻译：信道估计器使用一个或多个相关参考向量来消除数据相关噪声
公开(公告)号：US07289580B2
公开(公告)日：2007-10-30
申请号：US10267242
申请日：2002-10-09
申请人： Christopher J. Pladdy , Mark Fimoff , Sreenivasa M. Nerayanuru , Serdar Ozen , Michael D. Zoltowski
发明人： Christopher J. Pladdy , Mark Fimoff , Sreenivasa M. Nerayanuru , Serdar Ozen , Michael D. Zoltowski
IPC分类号： H04L27/06
CPC分类号： H04L25/0212 , H04L25/0224
摘要： An impulse response of a channel is estimated by correlating a received signal with a stored vector. The received signal contains a training sequence having a length Ltr, the stored vector has a length Lsv, Ltr/n=Lsv, and n is greater than two. The signal is received by a device. The vector is determined based on the training sequence and an ideal channel. The ideal channel is an idealized form of a channel through which the device receives the signal. A plurality of correlations may be performed where each correlation provides a substantially noise-free estimate of the impulse response of a different portion of the channel. The correlations are combined to provide an estimate of the impulse response of the channel.
摘要翻译：通过将接收的信号与存储的矢量相关联来估计信道的脉冲响应。所接收的信号包含具有长度L 的训练序列，所存储的矢量具有长度L sv，L，tr，/ L，L， SUB> sv ，n大于2。信号由设备接收。基于训练序列和理想信道确定向量。理想的通道是设备接收信号的通道的理想形式。可以执行多个相关性，其中每个相关性提供对信道的不同部分的脉冲响应的基本上无噪声的估计。相关性被组合以提供信道的脉冲响应的估计。

9. 发明授权

US07239679B2 Adaptive thresholding algorithm for the noise due to unknown symbols in correlation based channel impulse response (CIR) estimate 有权
标题翻译：在基于相关的信道脉冲响应（CIR）估计中由于未知符号引起的噪声的自适应阈值算法
公开(公告)号：US07239679B2
公开(公告)日：2007-07-03
申请号：US10227661
申请日：2002-08-26
申请人： Mark Fimoff , Sreenivasa M. Nerayanuru , Christopher J. Pladdy
发明人： Mark Fimoff , Sreenivasa M. Nerayanuru , Christopher J. Pladdy
IPC分类号： H04L1/00 , H04L25/08
CPC分类号： H04L25/0218
摘要： An impulse response is estimated for a channel by estimating an intermediate impulse response of the channel. The intermediate impulse response comprises at least one multipath spike and one or more non-deterministic noise components at locations throughout the channel. Then, a threshold function is applied to the estimated intermediate impulse response across at least a portion of the channel in order to provide an estimated final impulse response of the channel. The threshold function has the effect of nulling the noise components of the channel having values less than the threshold function at the location within the channel of the respective noise component, and the threshold function is characterized by a level that varies across the portion of the channel from a minimum value to a maximum value in a manner determined by the location of the at least one multipath spike within the channel.
摘要翻译：通过估计信道的中间脉冲响应来估计信道的脉冲响应。中间脉冲响应包括在整个通道的位置处的至少一个多路径尖峰和一个或多个非确定性噪声分量。然后，阈值函数被应用于跨信道的至少一部分的估计的中间脉冲响应，以便提供信道的估计的最终脉冲响应。阈值函数具有使在各个噪声分量的信道内的位置处具有小于阈值函数的信道的噪声分量归零的效果，并且阈值函数的特征在于在信道的整个部分上变化的电平以由通道内的至少一个多径峰值的位置确定的方式从最小值到最大值。

10. 发明授权

US09106485B1 System and method for FSK demodulation 有权
标题翻译： FSK解调的系统和方法
公开(公告)号：US09106485B1
公开(公告)日：2015-08-11
申请号：US14193189
申请日：2014-02-28
申请人： Khurram Waheed , Sreenivasa M. Nerayanuru
发明人： Khurram Waheed , Sreenivasa M. Nerayanuru
IPC分类号： H04L27/10 , H04L27/14 , H04W4/00
CPC分类号： H04W4/80 , H04L27/0008 , H04L27/106 , H04L27/148
摘要： A system and method for frequency-selective demodulation is presented. An input signal is received that is modulated by frequency shift keying (FSK) and encodes data at a first and second frequency. The input signal is supplied to a plurality of estimators that include a first estimator configured to detect a first signal at the first frequency, a second estimator configured to detect a second signal at the second frequency, a third estimator configured to detect a third signal at a third frequency, and a fourth estimator configured to detect a fourth signal at a fourth frequency. An output is generated indicating receipt of the data encoded at the first frequency or the second frequency based upon outputs of the first estimator, the second estimator, the third estimator, and the fourth estimator.
摘要翻译：提出了一种用于频率选择解调的系统和方法。接收通过频移键控（FSK）调制的输入信号，并以第一和第二频率对数据进行编码。输入信号被提供给多个估计器，其包括被配置为检测第一频率的第一信号的第一估计器，被配置为检测第二频率的第二信号的第二估计器，被配置为检测第二信号的第三信号第三频率和第四估计器，被配置为以第四频率检测第四信号。产生指示基于第一估计器，第二估计器，第三估计器和第四估计器的输出以第一频率或第二频率编码的数据的接收的输出。

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