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公开(公告)号：US08897353B2
公开(公告)日：2014-11-25
申请号：US13835305
申请日：2013-03-15
CPC分类号： H04L27/2695 , H04L25/0212 , H04L25/0218 , H04L25/022 , H04L25/0232 , H04L25/025
摘要： An OFDM receiver receives OFDM symbols in the frequency domain and comb filters and then punctures the OFDM symbols to leave symbols with actual pilot information and with null values at the data symbols. The receiver provides the punctured OFDM symbols to an OFDM symbol queue. A virtual pilot interpolator is coupled to the punctured OFDM symbol storage to generate virtual pilot information introduced to OFDM symbols. The interpolator may be a two dimensional Wiener filter. The receiver also includes a time domain channel estimator that processes a first OFDM symbol including virtual pilot information to generate a channel impulse response for the first OFDM symbol. A frequency equalizer equalizes the OFDM symbol in response to the channel impulse response for the first OFDM symbol.
摘要翻译： OFDM接收机接收频域中的OFDM符号和梳状滤波器，然后对OFDM符号进行穿孔，以留下具有实际导频信息的符号，并在数据符号处具有空值。 接收机将穿孔的OFDM符号提供给OFDM符号队列。 虚拟导频内插器耦合到穿孔的OFDM符号存储器，以产生引入OFDM符号的虚拟导频信息。 内插器可以是二维维纳滤波器。 接收机还包括时域信道估计器，处理包含虚拟导频信息的第一OFDM符号以产生第一OFDM符号的信道脉冲响应。 频率均衡器响应于第一OFDM符号的信道脉冲响应来均衡OFDM符号。
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公开(公告)号：US20140269882A1
公开(公告)日：2014-09-18
申请号：US13835305
申请日：2013-03-15
IPC分类号： H04L25/02
CPC分类号： H04L27/2695 , H04L25/0212 , H04L25/0218 , H04L25/022 , H04L25/0232 , H04L25/025
摘要： An OFDM receiver receives OFDM symbols in the frequency domain and comb filters and then punctures the OFDM symbols to leave symbols with actual pilot information and with null values at the data symbols. The receiver provides the punctured OFDM symbols to an OFDM symbol queue. A virtual pilot interpolator is coupled to the punctured OFDM symbol storage to generate virtual pilot information introduced to OFDM symbols. The interpolator may be a two dimensional Wiener filter. The receiver also includes a time domain channel estimator that processes a first OFDM symbol including virtual pilot information to generate a channel impulse response for the first OFDM symbol. A frequency equalizer equalizes the OFDM symbol in response to the channel impulse response for the first OFDM symbol.
摘要翻译： OFDM接收机接收频域中的OFDM符号和梳状滤波器，然后对OFDM符号进行穿孔，以留下具有实际导频信息的符号，并在数据符号处具有空值。 接收机将穿孔的OFDM符号提供给OFDM符号队列。 虚拟导频内插器耦合到穿孔的OFDM符号存储器，以产生引入OFDM符号的虚拟导频信息。 内插器可以是二维维纳滤波器。 接收机还包括时域信道估计器，处理包含虚拟导频信息的第一OFDM符号以产生第一OFDM符号的信道脉冲响应。 频率均衡器响应于第一OFDM符号的信道脉冲响应来均衡OFDM符号。
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3.发明申请公开(公告)号：US20140269880A1
公开(公告)日：2014-09-18
申请号：US13835659
申请日：2013-03-15
IPC分类号： H04L1/00
CPC分类号： H04L1/0038 , H04L25/0212 , H04L25/0232 , H04L25/0246
摘要： A receiver performs interference mitigation under blind or semi-blind conditions using diversity present in the signal of interest or in the interferer. A first path interference mitigation procedure extracts training information from received signals, performs interference mitigation on the training information and estimates the channel. The second path interference mitigation procedure uses data extracted from the received signal and the channel estimate to perform interference mitigation. Each interference mitigation process can take the form of a lossy compression followed by decompression.
摘要翻译： 接收机在盲或半盲条件下使用感兴趣的信号或干扰信号中存在的分集来执行干扰减轻。 第一路径干扰减轻程序从接收信号中提取训练信息，对训练信息执行干扰减轻并估计该信道。 第二路径干扰减轻过程使用从接收信号提取的数据和信道估计来执行干扰减轻。 每个干扰减轻过程可以采取有损压缩的形式，随后进行解压缩。
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公开(公告)号：US08824527B2
公开(公告)日：2014-09-02
申请号：US13416990
申请日：2012-03-09
IPC分类号： H04B1/00
CPC分类号： H04L25/0204 , H04L25/0212 , H04L25/03057 , H04L25/03159 , H04L27/2647
摘要： An OFDM communication system performs time domain channel estimation responsive to received symbols before the symbols are processed by a fast Fourier transform. The communication system generates virtual pilots from actual pilots to improve the stability and quality of channel estimation. The system generates a reference signal from the actual and virtual pilots and correlates the resulting reference signal with a signal responsive to the received symbol to generate an initial channel impulse response (CIR) and to determine statistics about the channel. In some circumstances, the resulting reference signal is correlated with a modified symbol in which the actual and virtual pilot locations are emphasized and the data locations are deemphasized. Time domain channel estimation iteratively improves on the initial CIR. The system determines channel estimates for data only symbols through averaging such as interpolation.
摘要翻译： 在通过快速傅里叶变换处理符号之前，OFDM通信系统响应于接收的符号执行时域信道估计。 通信系统从实际导频生成虚拟导频，提高信道估计的稳定性和质量。 该系统从实际和虚拟导频生成参考信号，并使得到的参考信号与响应于接收到的符号的信号相关，以产生初始信道脉冲响应（CIR）并且确定关于信道的统计。 在一些情况下，所得到的参考信号与其中强调实际和虚拟导频位置并且数据位置被加重的修改符号相关。 时域信道估计在初始CIR上迭代地提高。 该系统通过诸如插值的平均来确定仅数据符号的信道估计。
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公开(公告)号：US20100195774A1
公开(公告)日：2010-08-05
申请号：US12365805
申请日：2009-02-04
CPC分类号： H04L25/025 , H04B7/0848 , H04L25/0212 , H04L25/0224 , H04L27/2647
摘要： An OFDM system generates a channel estimate in the time domain for use in either a frequency domain equalizer or in a time domain equalizer. Preferably channel estimation is accomplished in the time domain using a locally generated reference signal. The channel estimator generates an initial estimate from a cross correlation between the time domain reference signal and an input signal input to the receiver and generates at least one successive channel estimate. Preferably the successive channel estimate is determined by vector addition (or subtraction) to the initial channel estimate. The at least one successive channel estimate reduces the minimum mean square error of the estimate with respect to a received signal.
摘要翻译： OFDM系统在时域中产生用于频域均衡器或时域均衡器中的信道估计。 优选地，使用本地生成的参考信号在时域中完成信道估计。 信道估计器根据时域参考信号和输入到接收机的输入信号之间的互相关产生初始估计，并产生至少一个连续的信道估计。 优选地，通过对初始信道估计的向量相加（或减法）来确定连续信道估计。 所述至少一个连续的信道估计相对于接收到的信号减小估计的最小均方误差。
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公开(公告)号：US09154337B2
公开(公告)日：2015-10-06
申请号：US13841348
申请日：2013-03-15
CPC分类号： H04L25/0204 , H04L25/0212 , H04L25/0216 , H04L25/022 , H04L25/0224 , H04L25/03159 , H04L27/2647
摘要： An OFDM receiver generates an initial channel impulse response in response to a received OFDM signal. The receiver determines the time span within the initial channel impulse response in which significant paths are present. An intermediate channel impulse response estimator identifies paths within the initial channel impulse response and generates an improved intermediate channel impulse response. A channel impulse response estimator performs a second non-linear process to generate a channel impulse response. An equalizer responds to the channel impulse response and the OFDM symbol to equalize the OFDM symbol. Metrics are generated that can be used for effectively stopping the second iterative non-linear process.
摘要翻译： OFDM接收机响应于接收的OFDM信号产生初始信道脉冲响应。 接收机确定在其中存在有重要路径的初始信道脉冲响应中的时间间隔。 中间信道脉冲响应估计器识别初始信道脉冲响应内的路径，并产生改进的中间信道脉冲响应。 信道脉冲响应估计器执行第二非线性处理以产生信道脉冲响应。 均衡器响应于信道脉冲响应和OFDM符号以均衡OFDM符号。 生成可用于有效停止第二迭代非线性过程的度量。
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公开(公告)号：US07639738B2
公开(公告)日：2009-12-29
申请号：US11472196
申请日：2006-06-21
IPC分类号： H03H7/30
CPC分类号： H04L25/03133 , H04L2025/03445
摘要： A communication system includes a channel shortening filter to reduce intersymbol interference and facilitate recovery of communications. The channel shortening filter preferably includes a energy concentration filter that optimizes SNR or SINR or other performance criterion and a impulse response tail canceller filter that eliminates energy or, equivalently, cancels coefficients outside the allowed delay-spread window for the channel. Preferably the filters are calculated using signal decomposition.
摘要翻译： 一种通信系统包括一个通道缩短滤波器，以减少码间干扰并便于通信恢复。 通道缩短滤波器优选地包括能量浓度滤波器，其优化SNR或SINR或其他性能标准，以及脉冲响应尾部消除器滤波器，其消除能量或等效地消除用于信道的允许的延迟扩展窗口之外的系数。 优选地，使用信号分解来计算滤波器。
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公开(公告)号：US20070297499A1
公开(公告)日：2007-12-27
申请号：US11472196
申请日：2006-06-21
CPC分类号： H04L25/03133 , H04L2025/03445
摘要： A communication system includes a channel shortening filter to reduce intersymbol interference and facilitate recovery of communications. The channel shortening filter preferably includes a energy concentration filter that optimizes SNR or SINR or other performance criterion and a impulse response tail canceller filter that eliminates energy or, equivalently, cancels coefficients outside the allowed delay-spread window for the channel. Preferably the filters are calculated using signal decomposition.
摘要翻译： 一种通信系统包括一个通道缩短滤波器，以减少码间干扰并便于通信恢复。 通道缩短滤波器优选地包括能量浓度滤波器，其优化SNR或SINR或其他性能标准，以及脉冲响应尾部消除器滤波器，其消除能量或等效地消除用于信道的允许的延迟扩展窗口之外的系数。 优选地，使用信号分解来计算滤波器。
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9.发明授权公开(公告)号：US06834109B1
公开(公告)日：2004-12-21
申请号：US09710610
申请日：2000-11-10
申请人： Thomas E. Paré, Jr. , Michail Tsatsanis , Ioannis Kanellakopoulos , Mark Alan Erickson , Cecilia Gabriela Galarza , James W. Waite , Daniel Joseph Hernandez , Sunil C. Shah , Ming Gu , Norman Man Leung Yuen , Heberly Rosario , Di Lin , Fernando Lopez-de-Victoria
发明人： Thomas E. Paré, Jr. , Michail Tsatsanis , Ioannis Kanellakopoulos , Mark Alan Erickson , Cecilia Gabriela Galarza , James W. Waite , Daniel Joseph Hernandez , Sunil C. Shah , Ming Gu , Norman Man Leung Yuen , Heberly Rosario , Di Lin , Fernando Lopez-de-Victoria
IPC分类号： H04M176
CPC分类号： H04L41/046 , H04B3/32 , H04L1/20 , H04L25/0204 , H04L25/03305 , H04L27/2608 , H04L41/06 , H04L41/142 , H04L41/145 , H04L2025/03414
摘要： The present invention includes a method and system for compensating for cross-talk interference in communication systems. The method includes estimation of the interfering signals. Further, the method includes performing a compensation operation on at least one interfering signal.
摘要翻译： 本发明包括用于补偿通信系统中的串扰干扰的方法和系统。 该方法包括干扰信号的估计。 此外，该方法包括对至少一个干扰信号执行补偿操作。
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10.发明授权公开(公告)号：US09031123B2
公开(公告)日：2015-05-12
申请号：US13835659
申请日：2013-03-15
CPC分类号： H04L1/0038 , H04L25/0212 , H04L25/0232 , H04L25/0246
摘要： A receiver performs interference mitigation under blind or semi-blind conditions using diversity present in the signal of interest or in the interferer. A first path interference mitigation procedure extracts training information from received signals, performs interference mitigation on the training information and estimates the channel. The second path interference mitigation procedure uses data extracted from the received signal and the channel estimate to perform interference mitigation. Each interference mitigation process can take the form of a lossy compression followed by decompression.
摘要翻译： 接收机在盲或半盲条件下使用感兴趣的信号或干扰信号中存在的分集来执行干扰减轻。 第一路径干扰减轻程序从接收信号中提取训练信息，对训练信息执行干扰减轻并估计该信道。 第二路径干扰减轻过程使用从接收信号提取的数据和信道估计来执行干扰减轻。 每个干扰减轻过程可以采取有损压缩的形式，随后进行解压缩。
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