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1.发明授权公开(公告)号：US09282525B2
公开(公告)日：2016-03-08
申请号：US13925023
申请日：2013-06-24
CPC分类号： H04W56/0005
摘要： Methods and systems are disclosed for frequency-domain symbol and frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency components associated with subcarriers within the multi-carrier communication signals. Symbol synchronization is performed in the frequency domain by performing correlation(s) between frequency components of the received signal and frequency-domain synchronization symbol(s). After symbol synchronization, frame synchronization correlation is also performed in the frequency domain between frequency components of the received signal and frequency-domain synchronization symbol(s). The disclosed embodiments are particularly useful for symbol and frame synchronization in multi-carrier received signals for power line communication (PLC) systems and/or other harsh noisy communication environments.
摘要翻译： 公开了用于多载波通信系统的频域符号和帧同步的方法和系统。 接收的信号被采样并转换成与多载波通信信号内的子载波相关联的频率分量。 通过执行接收信号的频率分量与频域同步符号之间的相关性，在频域中执行符号同步。 在符号同步之后，也在接收信号的频率分量与频域同步符号之间的频域中执行帧同步相关。 所公开的实施例对于用于电力线通信（PLC）系统和/或其他恶劣的噪声通信环境的多载波接收信号中的符号和帧同步特别有用。
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2.发明申请公开(公告)号：US20140376540A1
公开(公告)日：2014-12-25
申请号：US13925023
申请日：2013-06-24
IPC分类号： H04W56/00
CPC分类号： H04W56/0005
摘要： Methods and systems are disclosed for frequency-domain symbol and frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency components associated with subcarriers within the multi-carrier communication signals. Symbol synchronization is performed in the frequency domain by performing correlation(s) between frequency components of the received signal and frequency-domain synchronization symbol(s). After symbol synchronization, frame synchronization correlation is also performed in the frequency domain between frequency components of the received signal and frequency-domain synchronization symbol(s). The disclosed embodiments are particularly useful for symbol and frame synchronization in multi-carrier received signals for power line communication (PLC) systems and/or other harsh noisy communication environments.
摘要翻译： 公开了用于多载波通信系统的频域符号和帧同步的方法和系统。 接收的信号被采样并转换成与多载波通信信号内的子载波相关联的频率分量。 通过执行接收信号的频率分量与频域同步符号之间的相关性，在频域中执行符号同步。 在符号同步之后，也在接收信号的频率分量与频域同步符号之间的频域中执行帧同步相关。 所公开的实施例对于用于电力线通信（PLC）系统和/或其他恶劣的噪声通信环境的多载波接收信号中的符号和帧同步特别有用。
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3.发明申请Frequency-Domain Amplitude Normalization For Symbol Correlation In Multi-Carrier Systems 有权用于多载波系统中的符号相关的频域幅度归一化公开(公告)号：US20140376648A1
公开(公告)日：2014-12-25
申请号：US13924792
申请日：2013-06-24
IPC分类号： H04L27/26
CPC分类号： H04L27/2655 , H04B3/54 , H04L27/2663 , H04L27/2672 , H04L27/2675 , H04L27/2688 , H04L27/3809
摘要： Methods and systems are disclosed for frequency-domain amplitude normalization for symbol correlation in multi-carrier communication systems. Digital samples associated with input signals received from a communication medium are processed using a Fast Fourier Transform (FFT) to generate complex frequency components. Each complex frequency component is normalized with respect to its amplitude, and the frequency-domain, amplitude-normalized frequency components are multiplied with frequency components for reference symbol(s) to generate frequency-domain correlation values. These frequency-domain correlation values are analyzed to determine if a correlation exists between the amplitude-normalized frequency components and the predetermined reference frequency components. A correlation detection output is then generated that indicates whether or not a symbol synchronization was achieved. The disclosed embodiments are particularly useful for symbol correlation in received signals for power line communication (PLC) systems.
摘要翻译： 公开了用于多载波通信系统中的符号相关的频域幅度归一化的方法和系统。 使用快速傅立叶变换（FFT）处理与从通信介质接收的输入信号相关联的数字采样以产生复频率分量。 每个复频分量相对于其振幅被归一化，并且将频域幅度归一化频率分量与用于参考符号的频率分量相乘以产生频域相关值。 分析这些频域相关值，以确定振幅归一化频率分量与预定参考频率分量之间是否存在相关性。 然后生成指示是否实现符号同步的相关检测输出。 所公开的实施例对于用于电力线通信（PLC）系统的接收信号中的符号相关性特别有用。
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4.发明授权Frequency-domain amplitude normalization for symbol correlation in multi-carrier systems 有权多载波系统中符号相关的频域幅度归一化公开(公告)号：US09100261B2
公开(公告)日：2015-08-04
申请号：US13924792
申请日：2013-06-24
CPC分类号： H04L27/2655 , H04B3/54 , H04L27/2663 , H04L27/2672 , H04L27/2675 , H04L27/2688 , H04L27/3809
摘要： Methods and systems are disclosed for frequency-domain amplitude normalization for symbol correlation in multi-carrier communication systems. Digital samples associated with input signals received from a communication medium are processed using a Fast Fourier Transform (FFT) to generate complex frequency components. Each complex frequency component is normalized with respect to its amplitude, and the frequency-domain, amplitude-normalized frequency components are multiplied with frequency components for reference symbol(s) to generate frequency-domain correlation values. These frequency-domain correlation values are analyzed to determine if a correlation exists between the amplitude-normalized frequency components and the predetermined reference frequency components. A correlation detection output is then generated that indicates whether or not a symbol synchronization was achieved. The disclosed embodiments are particularly useful for symbol correlation in received signals for power line communication (PLC) systems.
摘要翻译： 公开了用于多载波通信系统中的符号相关的频域幅度归一化的方法和系统。 使用快速傅立叶变换（FFT）处理与从通信介质接收的输入信号相关联的数字采样以产生复频率分量。 每个复频分量相对于其振幅被归一化，并且将频域幅度归一化频率分量与用于参考符号的频率分量相乘以产生频域相关值。 分析这些频域相关值，以确定振幅归一化频率分量与预定参考频率分量之间是否存在相关性。 然后生成指示是否实现符号同步的相关检测输出。 所公开的实施例对于用于电力线通信（PLC）系统的接收信号中的符号相关性特别有用。
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公开(公告)号：US20140376674A1
公开(公告)日：2014-12-25
申请号：US13924996
申请日：2013-06-24
IPC分类号： H04L27/26
CPC分类号： H04L27/2662 , H04B3/54 , H04L27/2656 , H04L27/2672 , H04L27/2675 , H04L27/2688
摘要： Methods and systems are disclosed for frequency-domain frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency domain components associated with subcarriers within the multi-carrier communication signals. A sliding-window correlation (e.g., two-dimensional sliding window) is applied to the received symbols represented in the frequency domain to detect frame boundaries for multi-carrier signals. The sliding-window frame synchronization can be applied by itself or can be applied in combination with one or more additional frame synchronization stages. The disclosed embodiments are particularly useful for frame synchronization of multi-carrier signals in PLC (power line communication) systems.
摘要翻译： 公开了用于多载波通信系统的频域帧同步的方法和系统。 接收的信号被采样并转换成与多载波通信信号内的子载波相关联的频域分量。 将滑窗相关（例如，二维滑动窗口）应用于在频域中表示的接收符号，以检测多载波信号的帧边界。 滑动窗口帧同步可以自己应用或者可以与一个或多个附加帧同步阶段组合应用。 所公开的实施例对于PLC（电力线通信）系统中的多载波信号的帧同步特别有用。
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公开(公告)号：US09106499B2
公开(公告)日：2015-08-11
申请号：US13924996
申请日：2013-06-24
CPC分类号： H04L27/2662 , H04B3/54 , H04L27/2656 , H04L27/2672 , H04L27/2675 , H04L27/2688
摘要： Methods and systems are disclosed for frequency-domain frame synchronization for multi-carrier communication systems. Received signals are sampled and converted into frequency domain components associated with subcarriers within the multi-carrier communication signals. A sliding-window correlation (e.g., two-dimensional sliding window) is applied to the received symbols represented in the frequency domain to detect frame boundaries for multi-carrier signals. The sliding-window frame synchronization can be applied by itself or can be applied in combination with one or more additional frame synchronization stages. The disclosed embodiments are particularly useful for frame synchronization of multi-carrier signals in PLC (power line communication) systems.
摘要翻译： 公开了用于多载波通信系统的频域帧同步的方法和系统。 接收的信号被采样并转换成与多载波通信信号内的子载波相关联的频域分量。 将滑窗相关（例如，二维滑动窗口）应用于在频域中表示的接收符号，以检测多载波信号的帧边界。 滑动窗口帧同步可以自己应用或者可以与一个或多个附加帧同步阶段组合应用。 所公开的实施例对于PLC（电力线通信）系统中的多载波信号的帧同步特别有用。
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公开(公告)号：US20140376667A1
公开(公告)日：2014-12-25
申请号：US13924940
申请日：2013-06-24
IPC分类号： H04L27/26
CPC分类号： H04L27/2657 , H04L25/03159 , H04L27/2647
摘要： Methods and systems are disclosed for frequency-domain carrier blanking in multi-carrier communication systems. When excessive energy is detected in one or more subcarriers within a received symbol for multi-carrier communications, those subcarriers are blanked for subsequent demodulation in order to avoid corruption of the demodulated data. A conversion from time-domain digital samples to frequency-domain values using an FFT (Fast Fourier Transform) and a threshold detector are utilized to detect corrupted subcarriers. Further, this frequency-domain carrier blanking can be implemented dynamically on a symbol-by-symbol basis to further improve demodulation performance by reducing decoding errors. The disclosed embodiments are particularly useful for improving demodulation performance in power line communication (PLC) systems.
摘要翻译： 公开了用于多载波通信系统中的频域载波消隐的方法和系统。 当在用于多载波通信的接收符号内的一个或多个子载波中检测到过多的能量时，为了后续解调，将这些子载波消隐以避免解调数据的损坏。 利用FFT（快速傅里叶变换）和阈值检测器将时域数字样本转换为频域值，以检测损坏的子载波。 此外，该频域载波消隐可以逐个符号地动态地实现，以通过减少解码错误来进一步提高解调性能。 所公开的实施例对于改善电力线通信（PLC）系统中的解调性能特别有用。
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8.发明授权Transmitter and method for reducing the peak-to-average power ratio of a digitally modulated communication signal 有权用于降低数字调制通信信号的峰均功率比的发射机和方法公开(公告)号：US09008223B1
公开(公告)日：2015-04-14
申请号：US14140123
申请日：2013-12-24
申请人： Raja V. Tamma , Kevin B. Traylor , Jianqiang Zeng
发明人： Raja V. Tamma , Kevin B. Traylor , Jianqiang Zeng
CPC分类号： H04L27/2623 , H04L25/03828 , H04L25/08
摘要： A transmitter and method for processing a digitally modulated communication signal, which may reduce peak-to-average-power-ratio (PAPR) while maintaining acceptable error rates is disclosed. After subcarrier mapping, a first digital representation of the signal is upsampled into a second digital representation, which is transformed into a first time domain representation. Samples whose magnitudes exceed a magnitude limit are limited to that limit to produce a second time domain representation. The second time domain representation is transformed to a third frequency domain representation, which is downsampled into a fourth frequency domain representation. In addition to the in-band subcarriers, some out-of-band subcarriers adjacent to the frequency band are preserved while the remaining out-of-band subcarriers are eliminated to produce a fifth frequency domain representation. The fifth frequency domain representation is then transformed to a third time domain representation, which is converted to an analog signal to be transmitted.
摘要翻译： 公开了一种用于处理数字调制通信信号的发射机和方法，其可以在保持可接受的错误率的同时降低峰值与平均功率比（PAPR）。 在子载波映射之后，信号的第一数字表示被上采样成第二数字表示，其被变换为第一时域表示。 其幅度超过幅度限制的样本被限制为限制以产生第二时域表示。 第二时域表示被转换为第三频域表示，其被下采样成第四频域表示。 除了带内子载波之外，保留与频带相邻的一些带外副载波，而剩余的带外副载波被消除以产生第五频域表示。 然后将第五频域表示变换为第三时域表示，其被转换为要发送的模拟信号。
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9.发明授权公开(公告)号：US07933372B2
公开(公告)日：2011-04-26
申请号：US11683630
申请日：2007-03-08
CPC分类号： H04L25/0328 , H04L2025/03426
摘要： A method for processing a plurality of symbol streams is provided. The method includes receiving a first symbol stream, wherein the first symbol stream has a corresponding first number of retransmissions. The method further includes receiving a second symbol stream, wherein the second symbol stream has a corresponding second number of retransmissions. The method further includes selecting the first symbol stream for decoding, if the first number of retransmissions is greater than the second number of retransmissions.
摘要翻译： 提供了一种用于处理多个符号流的方法。 该方法包括接收第一符号流，其中第一符号流具有对应的第一数目的重传。 该方法还包括接收第二符号流，其中第二符号流具有对应的第二数量的重传。 该方法还包括：如果第一次重发次数大于第二次重发次数，则选择用于解码的第一符号流。
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10.发明授权Techniques for generating bit log-likelihood ratios in communication systems using differential modulation 有权在使用差分调制的通信系统中生成比特对数似然比的技术公开(公告)号：US09112754B2
公开(公告)日：2015-08-18
申请号：US14048139
申请日：2013-10-08
申请人： Raja V. Tamma
发明人： Raja V. Tamma
CPC分类号： H04L27/2071 , H04L1/0047 , H04L1/0054 , H04L25/067 , H04L27/2331
摘要： A technique for generating a bit log-likelihood ratio (LLR) in a communication system includes generating a demodulated signal based on a received symbol and a reference symbol. An input for a bit LLR generator is generated based on the demodulated signal and a normalization value that is based on the received symbol or the reference symbol. A bit LLR is generated for the received symbol, using the bit LLR generator, based on the input.
摘要翻译： 在通信系统中生成比特对数似然比（LLR）的技术包括：基于接收的符号和参考符号生成解调信号。 基于解调信号和基于接收到的符号或参考符号的归一化值来生成用于位LLR发生器的输入。 基于输入，使用位LLR生成器为接收到的符号生成位LLR。
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