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1. 发明申请

US20120069916A1 FREQUENCY OFFSET ESTIMATOR FOR UPSTREAM CABLE SIGNALS 有权
标题翻译：用于UPSTREAM电缆信号的频率偏移估计器
公开(公告)号：US20120069916A1
公开(公告)日：2012-03-22
申请号：US13228037
申请日：2011-09-08
申请人： Brian Berscheid , Eric Salt , Ha Nguyen
发明人： Brian Berscheid , Eric Salt , Ha Nguyen
IPC分类号： H04L27/00
CPC分类号： H04L27/0014 , H04L12/2801 , H04L2027/003 , H04L2027/0038 , H04L2027/0095
摘要： In a DOCSIS transmission network, it is necessary for an upstream receiver to estimate and correct for errors in the carrier frequency of the transmission based upon observations of a preamble sequence. This task is complicated by the fact that microreflections in the upstream channels cause intersymbol interference, which tends to bias the frequency estimation circuit. An economical, ISI-immune algorithm is provided for estimating the carrier frequency of upstream transmissions. The arrangement improves the reliability of the frequency estimates in the presence of ISI, thereby reducing the overhead and increasing the throughput of the upstream channels.
摘要翻译：在DOCSIS传输网络中，上游接收机有必要基于前导序列的观察来估计和校正传输的载波频率中的错误。这个任务是复杂的，因为上行信道中的微反射引起码间干扰，这倾向于偏置频率估计电路。提供了经济的ISI免疫算法来估计上行传输的载波频率。该装置提高了存在ISI的频率估计的可靠性，从而降低了上行信道的开销和增加吞吐量。

2. 发明授权

US08755462B2 Frequency offset estimator for upstream cable signals 有权
标题翻译：上行电缆信号频偏估计器
公开(公告)号：US08755462B2
公开(公告)日：2014-06-17
申请号：US13228037
申请日：2011-09-08
申请人： Brian Berscheid , Eric Salt , Ha Nguyen
发明人： Brian Berscheid , Eric Salt , Ha Nguyen
IPC分类号： H04L27/36 , H04M9/00
CPC分类号： H04L27/0014 , H04L12/2801 , H04L2027/003 , H04L2027/0038 , H04L2027/0095
摘要： In a DOCSIS transmission network, it is necessary for an upstream receiver to estimate and correct for errors in the carrier frequency of the transmission based upon observations of a preamble sequence. This task is complicated by the fact that microreflections in the upstream channels cause intersymbol interference, which tends to bias the frequency estimation circuit. An economical, ISI-immune algorithm is provided for estimating the carrier frequency of upstream transmissions. The arrangement improves the reliability of the frequency estimates in the presence of ISI, thereby reducing the overhead and increasing the throughput of the upstream channels.
摘要翻译：在DOCSIS传输网络中，上游接收机有必要基于前导序列的观察来估计和校正传输的载波频率中的错误。这个任务是复杂的，因为上行信道中的微反射引起码间干扰，这倾向于偏置频率估计电路。提供了经济的ISI免疫算法来估计上行传输的载波频率。该装置提高了存在ISI的频率估计的可靠性，从而降低了上行信道的开销和增加吞吐量。

3. 发明申请

US20200267040A1 PAPR REDUCTION FOR OFDM SIGNALS 审中-公开
公开(公告)号：US20200267040A1
公开(公告)日：2020-08-20
申请号：US16794121
申请日：2020-02-18
申请人： Quang Nguyen , Ha H. Nguyen , Brian Berscheid , Eric Salt
发明人： Quang Nguyen , Ha H. Nguyen , Brian Berscheid , Eric Salt
IPC分类号： H04L27/26
摘要： In embodiments of the presently described subject matter, two efficient PAPR reduction methods for OFDM signals based upon the principle of tone reservation and building upon the clipping noise analysis presented in “Analysis of clipping noise and tonereservation algorithms for peak reduction in OFDM systems,” L. Wang and C. Tellambura, IEEE Trans. Veh. Technol., vol. 57, pp. 1675-1694, May 2008 are provided, each comprising two stages. The first stage is performed offline to prepare a set of cancellation signals based on the settings of the OFDM system. In particular, these cancellation signals are constructed to cancel signals at different levels of maximum instantaneous power that are above a predefined threshold. The second stage is performed online and in an iterative manner to reduce the peaks of OFDM symbols by using the cancellation signals constructed in the first stage.

4. 发明授权

US11140011B2 Papr reduction for OFDM signals 有权
公开(公告)号：US11140011B2
公开(公告)日：2021-10-05
申请号：US16794121
申请日：2020-02-18
申请人： Quang Nguyen , Ha H. Nguyen , Brian Berscheid , Eric Salt
发明人： Quang Nguyen , Ha H. Nguyen , Brian Berscheid , Eric Salt
IPC分类号： H04L27/26 , H04L5/00
摘要： In embodiments of the presently described subject matter, two efficient PAPR reduction methods for OFDM signals based upon the principle of tone reservation and building upon the clipping noise analysis presented in “Analysis of clipping noise and tone reservation algorithms for peak reduction in OFDM systems,” L. Wang and C. Tellambura, IEEE Trans. Veh. Technol., vol. 57, pp. 1675-1694, May 2008 are provided, each comprising two stages. The first stage is performed offline to prepare a set of cancellation signals based on the settings of the OFDM system. In particular, these cancellation signals are constructed to cancel signals at different levels of maximum instantaneous power that are above a predefined threshold. The second stage is performed online and in an iterative manner to reduce the peaks of OFDM symbols by using the cancellation signals constructed in the first stage.

5. 发明授权

US08411733B2 Signal equalizer for a signal transmission network 有权
标题翻译：用于信号传输网络的信号均衡器
公开(公告)号：US08411733B2
公开(公告)日：2013-04-02
申请号：US12815611
申请日：2010-06-15
申请人： Brian Berscheid , Zohreh Andalibi , Eric Salt
发明人： Brian Berscheid , Zohreh Andalibi , Eric Salt
IPC分类号： H03H7/30
CPC分类号： H04L25/03038 , H04L2025/03617 , H04L2025/03681
摘要： In an RF signal transmission network such as the reverse channels of a coaxial cable network, there is provided at least one adaptive equalizer for pre- or post-filtering inter-symbol interference in the transmitted signals, the adaptive equalizer having a series of coefficients for which values are required. In order to improve the transmission efficiency the preamble used in these channels is shortened by coarsely estimating the channel using a short “unique word’ placed at the beginning of the equalizer training sequence. The coarse channel estimate is crudely inverted to produce a set of equalizer coefficients which partially equalize the channel. By initializing the adaptive equalizer with these approximate coefficients, it is possible to reduce the length of the training sequence needed for the equalizer to converge.
摘要翻译：在诸如同轴电缆网络的反向信道的RF信号传输网络中，提供了至少一个自适应均衡器，用于在所发送的信号中对符号间干扰进行前或后滤波，所述自适应均衡器具有一系列系数需要哪些值。为了提高传输效率，通过使用放置在均衡器训练序列开始处的短独特字来粗略估计信道来缩短在这些信道中使用的前同步码。粗略的信道估计被粗略地反转以产生使信道部分均衡的一组均衡器系数。通过用这些近似系数初始化自适应均衡器，可以减少均衡器收敛所需的训练序列的长度。

6. 发明申请

US20100316111A1 SIGNAL EQUALIZER FOR A SIGNAL TRANSMISSION NETWORK 有权
标题翻译：用于信号传输网络的信号均衡器
公开(公告)号：US20100316111A1
公开(公告)日：2010-12-16
申请号：US12815611
申请日：2010-06-15
申请人： Brian Berscheid , Zohreh Andalibi , Eric Salt
发明人： Brian Berscheid , Zohreh Andalibi , Eric Salt
IPC分类号： H04L27/01
CPC分类号： H04L25/03038 , H04L2025/03617 , H04L2025/03681
摘要： In an RF signal transmission network such as the reverse channels of a coaxial cable network, there is provided at least one adaptive equalizer for pre- or post-filtering inter-symbol interference in the transmitted signals, the adaptive equalizer having a series of coefficients for which values are required. In order to improve the transmission efficiency the preamble used in these channels is shortened by coarsely estimating the channel using a short “unique word’ placed at the beginning of the equalizer training sequence. The coarse channel estimate is crudely inverted to produce a set of equalizer coefficients which partially equalize the channel. By initializing the adaptive equalizer with these approximate coefficients, it is possible to reduce the length of the training sequence needed for the equalizer to converge.
摘要翻译：在诸如同轴电缆网络的反向信道的RF信号传输网络中，提供了至少一个自适应均衡器，用于在所发送的信号中对符号间干扰进行前或后滤波，所述自适应均衡器具有一系列系数需要哪些值。为了提高传输效率，通过使用放置在均衡器训练序列开始处的短的“唯一字”来粗略地估计信道来缩短在这些信道中使用的前同步码。粗略的信道估计被粗略地反转以产生使信道部分均衡的一组均衡器系数。通过用这些近似系数初始化自适应均衡器，可以减少均衡器收敛所需的训练序列的长度。

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