公开(公告)号：US20100195774A1

公开(公告)日：2010-08-05

申请号：US12365805

申请日：2009-02-04

Applicant: Fernando Lopez de Victoria

Inventor： Fernando Lopez de Victoria

IPC: H04L27/00 ,  H04B1/10

CPC classification number: H04L25/025 ,  H04B7/0848 ,  H04L25/0212 ,  H04L25/0224 ,  H04L27/2647

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US09154337B2

公开(公告)日：2015-10-06

申请号：US13841348

申请日：2013-03-15

Applicant: Steven C Thompson ,  Roee Kalinksy ,  Fernando Lopez de Victoria

Inventor： Steven C Thompson ,  Roee Kalinksy ,  Fernando Lopez de Victoria

IPC: H04L27/01 ,  H04L25/02 ,  H04L27/26 ,  H04L25/03

CPC classification number: H04L25/0204 ,  H04L25/0212 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/03159 ,  H04L27/2647

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07639738B2

公开(公告)日：2009-12-29

申请号：US11472196

申请日：2006-06-21

Applicant: Fernando Lopez de Victoria

Inventor： Fernando Lopez de Victoria

IPC: H03H7/30

CPC classification number: H04L25/03133 ,  H04L2025/03445

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20070297499A1

公开(公告)日：2007-12-27

申请号：US11472196

申请日：2006-06-21

Applicant: Fernando Lopez de Victoria

Inventor： Fernando Lopez de Victoria

IPC: H03K5/159 ,  H04B1/10

CPC classification number: H04L25/03133 ,  H04L2025/03445

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20100074346A1

公开(公告)日：2010-03-25

申请号：US12235420

申请日：2008-09-22

Applicant: Steven C. Thompson ,  Fernando Lopez de Victoria

Inventor： Steven C. Thompson ,  Fernando Lopez de Victoria

IPC: H04L27/28 ,  H04L27/06

CPC classification number: H04L25/022 ,  H04L25/0228 ,  H04L25/0232 ,  H04L25/03159 ,  H04L27/2647 ,  H04L2025/03414

Abstract: An OFDM receiver includes a fast Fourier transform processor that receives signal samples and outputs frequency domain samples corresponding to a received symbol. A delay element receives sets of frequency domain samples outputs each of the sets of frequency domain samples following a predetermined delay interval. A frequency domain channel estimator receives frequency domain samples and derives channel estimates from each of the sets of frequency domain samples. A channel estimate queue stores a sequence of channel estimates provided by the channel estimator and provides the sequence to a weighted averaging element that outputs an averaged channel estimate. A frequency equalizer outputs an equalized set of frequency domain samples responsive to the delayed set of frequency domain samples and to the averaged channel estimate.

Abstract translation: OFDM接收机包括快速傅立叶变换处理器，其接收信号采样并输出与接收到的符号对应的频域采样。 延迟元件接收在预定的延迟间隔之后输出频域样本集合中的每一组的频域采样集。 频域信道估计器接收频域采样并从每个频域采样集中导出信道估计。 信道估计队列存储由信道估计器提供的信道估计序列，并将序列提供给输出平均信道估计的加权平均元素。 频率均衡器响应于延迟的频域采样集和平均信道估计而输出均衡的频域样本集合。

公开(公告)号：US20090122853A1

公开(公告)日：2009-05-14

申请号：US11938379

申请日：2007-11-12

Applicant: Fernando Lopez de Victoria

Inventor： Fernando Lopez de Victoria

IPC: H03H7/30

CPC classification number: H04L25/0248 ,  H04L5/0007 ,  H04L25/0232 ,  H04L25/025 ,  H04L25/03019 ,  H04L2025/03414 ,  H04L2025/03535 ,  H04L2025/03617

Abstract: A receiver includes a subspace filter having first and second basis filters, with the first basis filter module generating a weighted average channel estimate. The receiver collects a plurality of channel estimates over an interval and combines the plurality of channel estimates using a weighting factor and summing to generate the weighted average channel estimate. The receiver generates a weighting factor for each of the plurality of channel estimates over the interval the weighting factors vary as a function of the relative velocity of the receiver so that the estimates closest in time to the current estimate are weighted more heavily than estimates further spaced in time from the current estimate.

Abstract translation: 接收机包括具有第一和第二基本滤波器的子空间滤波器，第一基本滤波器模块产生加权平均信道估计。 接收机在一个间隔上收集多个信道估计，并且使用加权因子和求和来组合多个信道估计，以生成加权平均信道估计。 接收机在加权因子作为接收机的相对速度的函数变化的间隔上产生用于多个信道估计中的每一个的加权因子，使得在时间上与当前估计最接近的估计被加权比进一步间隔的估计更重 从目前的估计。

公开(公告)号：US08897353B2

公开(公告)日：2014-11-25

申请号：US13835305

申请日：2013-03-15

Applicant: Steven C Thompson ,  Fernando Lopez de Victoria

Inventor： Steven C Thompson ,  Fernando Lopez de Victoria

IPC: H03H7/30 ,  H04L25/02

CPC classification number: H04L27/2695 ,  H04L25/0212 ,  H04L25/0218 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/025

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20140269882A1

公开(公告)日：2014-09-18

申请号：US13835305

申请日：2013-03-15

Applicant: Steven C. Thompson ,  Fernando Lopez de Victoria

Inventor： Steven C. Thompson ,  Fernando Lopez de Victoria

IPC: H04L25/02

CPC classification number: H04L27/2695 ,  H04L25/0212 ,  H04L25/0218 ,  H04L25/022 ,  H04L25/0232 ,  H04L25/025

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20140269880A1

公开(公告)日：2014-09-18

申请号：US13835659

申请日：2013-03-15

Applicant: Fernando Lopez de Victoria

Inventor： Fernando Lopez de Victoria

IPC: H04L1/00

CPC classification number: H04L1/0038 ,  H04L25/0212 ,  H04L25/0232 ,  H04L25/0246

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08824527B2

公开(公告)日：2014-09-02

申请号：US13416990

申请日：2012-03-09

Applicant: Steven C Thompson ,  Fernando Lopez de Victoria

Inventor： Steven C Thompson ,  Fernando Lopez de Victoria

IPC: H04B1/00

CPC classification number: H04L25/0204 ,  H04L25/0212 ,  H04L25/03057 ,  H04L25/03159 ,  H04L27/2647

Abstract: 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.

Abstract translation: 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。