公开(公告)号：US20110044411A1

公开(公告)日：2011-02-24

申请号：US12916400

申请日：2010-10-29

申请人： Tao TIAN ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

发明人： Tao TIAN ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

IPC分类号： H04B1/10

CPC分类号： H04L27/2657

摘要： An OFDM telecommunications system includes a transmitter and a receiver. The receiver includes a canceller configured to reduce inter-carrier interference (ICI) in an OFDM symbol in the frequency domain.

摘要翻译： OFDM电信系统包括发射机和接收机。 接收机包括被配置为减少频域中的OFDM符号中的载波间干扰（ICI）的消除器。

公开(公告)号：US07733968B2

公开(公告)日：2010-06-08

申请号：US11361085

申请日：2006-02-22

申请人： Fuyun Ling ,  Durk L. Van Veen ,  Murali Ramaswamy Chari ,  Thomas Sun

发明人： Fuyun Ling ,  Durk L. Van Veen ,  Murali Ramaswamy Chari ,  Thomas Sun

IPC分类号： H04L27/28

CPC分类号： H04L5/023 ,  H04B17/13 ,  H04B17/391 ,  H04L25/022 ,  H04L25/0224 ,  H04L25/0232 ,  H04L27/0012

摘要： Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. A signal analyzer can be used to sample the output of a transmitter and the sampled signal can be propagated to a processor. The processor can generate frequency domain channel estimates for the subcarriers. If the transmitted modulation symbols are unknown, the processor can determine the modulation symbols and use the determined modulation symbols to calculate the channel estimates. The channel estimates can be averaged and used to generate various metrics to evaluate the transmitter performance.

摘要翻译： 描述了便于在无线通信环境中监视发射机性能的系统和方法。 信号分析仪可用于对发射机的输出采样，采样信号可以传播到处理器。 处理器可以产生子载波的频域信道估计。 如果发送的调制符号是未知的，则处理器可以确定调制符号并使用确定的调制符号来计算信道估计。 信道估计可以被平均化并用于生成各种度量以评估发射机的性能。

公开(公告)号：US07693231B2

公开(公告)日：2010-04-06

申请号：US11453439

申请日：2006-06-14

申请人： Fuyun Ling ,  Thomas Sun ,  Raghuraman Krisnamoorthi ,  Durk L. van Veen ,  Murali Ramaswamy Chari

发明人： Fuyun Ling ,  Thomas Sun ,  Raghuraman Krisnamoorthi ,  Durk L. van Veen ,  Murali Ramaswamy Chari

IPC分类号： H04L27/00

CPC分类号： H04L27/38 ,  H04B17/101 ,  H04B17/18 ,  H04L1/20 ,  H04L25/022

摘要： The claimed subject matter relates to estimating noise variance associated with a transmitter. For example, the noise variance can be estimated in connection with determining performance parameters associated with a transmitter. Determining noise variance can include the acts of estimating phase alteration of a received signal through utilization of a least squares-based phase estimation algorithm. Determining noise variance can also include the act of determining an unbiased estimation of noise variance as a function of the estimated phase alteration.

摘要翻译： 所要求保护的主题涉及估计与发射机相关的噪声方差。 例如，可以结合确定与发射机相关联的性能参数来估计噪声方差。 确定噪声方差可以包括通过利用基于最小平方的相位估计算法来估计接收信号的相位变化的动作。 确定噪声方差还可以包括确定噪声方差的无偏估计作为估计相位变化的函数的行为。

公开(公告)号：US07688899B2

公开(公告)日：2010-03-30

申请号：US09860274

申请日：2001-05-17

申请人： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

发明人： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

IPC分类号： H04K1/10

CPC分类号： H04W52/346 ,  H04L1/0009 ,  H04L1/0068 ,  H04L1/06 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/06 ,  H04L25/03343 ,  H04L2001/0096 ,  H04W52/24 ,  H04W52/42

摘要： Techniques to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbols and pre-weighting the modulation symbols for each selected channel based on the channel's characteristics. The pre-weighting may be achieved by “inverting” the selected channels so that the received SNRs are approximately similar for all selected channels. With selective channel inversion, only channels having SNRs at or above a particular threshold are selected, “bad” channels are not used, and the total available transmit power is distributed across only “good” channels. Improved performance is achieved due to the combined benefits of using only the Ns best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

摘要翻译： 用于处理数据以在从所有可用传输信道中选择的一组传输信道上进行传输的技术。 在一方面，数据处理包括基于公共编码和调制方案的编码数据，以提供调制符号并且基于该信道的特征对每个所选择的信道预先加权调制符号。 预加权可以通过“反转”所选择的信道来实现，使得接收的SNR对于所有选择的信道大致相似。 通过选择性信道反转，仅选择具有等于或高于特定阈值的SNR的信道，不使用“坏”信道，并且总可用发射功率仅在“良好”信道上分布。 由于仅使用Ns最佳信道并且将每个所选信道的接收SNR与所选择的编码和调制方案所需的SNR相匹配的综合益处，实现了改进的性能。

公开(公告)号：US20100074351A1

公开(公告)日：2010-03-25

申请号：US12499951

申请日：2009-07-09

申请人： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

发明人： John W. Ketchum ,  Steven J. Howard ,  Jay Rod Walton ,  Mark S. Wallace ,  Fuyun Ling

IPC分类号： H04L27/28

CPC分类号： H04W52/346 ,  H04L1/0009 ,  H04L1/0068 ,  H04L1/06 ,  H04L5/0023 ,  H04L5/0037 ,  H04L5/0046 ,  H04L5/006 ,  H04L5/06 ,  H04L25/03343 ,  H04L2001/0096 ,  H04W52/24 ,  H04W52/42

摘要： Techniques to process data for transmission over a set of transmission channels selected from among all available transmission channels. In an aspect, the data processing includes coding data based on a common coding and modulation scheme to provide modulation symbols and pre-weighting the modulation symbols for each selected channel based on the channel's characteristics. The pre-weighting may be achieved by “inverting” the selected channels so that the received SNRs are approximately similar for all selected channels. With selective channel inversion, only channels having SNRs at or above a particular threshold are selected, “bad” channels are not used, and the total available transmit power is distributed across only “good” channels. Improved performance is achieved due to the combined benefits of using only the NS best channels and matching the received SNR of each selected channel to the SNR required by the selected coding and modulation scheme.

公开(公告)号：US20100074317A1

公开(公告)日：2010-03-25

申请号：US12235553

申请日：2008-09-22

申请人： Thomas Sun ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Krishna Kizon Mukkavilli ,  Tao Tian ,  Bojan Vrcelj

发明人： Thomas Sun ,  Raghuraman Krishnamoorthi ,  Fuyun Ling ,  Krishna Kizon Mukkavilli ,  Tao Tian ,  Bojan Vrcelj

IPC分类号： H04L27/01

CPC分类号： H04L25/0212 ,  H04L25/0204 ,  H04L25/0216

摘要： Methods and systems are described for processing a signal in wireless communications. The signal may have synchronization information. A method of processing a signal having synchronization information may include receiving the signal, and determining a truncation region of the time domain estimated channel, the estimated channel having taps. The method further includes processing the channel taps within the truncation region.

摘要翻译： 描述了用于处理无线通信中的信号的方法和系统。 该信号可以具有同步信息。 处理具有同步信息的信号的方法可以包括接收信号，以及确定时域估计信道的截断区域，估计信道具有抽头。 该方法还包括处理截断区域内的信道抽头。

公开(公告)号：US20080220723A1

公开(公告)日：2008-09-11

申请号：US11860505

申请日：2007-09-24

申请人： Raghuraman Krishnamoorthi ,  Tao Tian ,  Fuyun Ling ,  Yuheng Huang

发明人： Raghuraman Krishnamoorthi ,  Tao Tian ,  Fuyun Ling ,  Yuheng Huang

IPC分类号： H04B7/00

CPC分类号： H04L27/2675 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/261 ,  H04L27/2655

摘要： An acquisition module includes a coherent correlator configured to receive a transmission having a pilot signal and correlate the received transmission with a local copy of the pilot signal to produce a first output, a delayed correlator configured to delay the first output and correlate the first output with the delayed first output to produce a second output, and a detector configured to detect the pilot signal in the transmission based on the second output.

摘要翻译： 获取模块包括相干相关器，其被配置为接收具有导频信号的传输并将接收到的传输与导频信号的本地副本相关联以产生第一输出，延迟相关器被配置为延迟第一输出并将第一输出与 延迟的第一输出以产生第二输出;以及检测器，被配置为基于所述第二输出来检测所述传输中的导频信号。

公开(公告)号：US20080159449A1

公开(公告)日：2008-07-03

申请号：US11674632

申请日：2007-02-13

申请人： Tao Tian ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

发明人： Tao Tian ,  Raghuraman Krishnamoorthi ,  Krishna Kiran Mukkavilli ,  Fuyun Ling

IPC分类号： H04L25/08

CPC分类号： H04L27/2657

摘要： An OFDM telecommunications system includes a transmitter and a receiver. The receiver includes a canceller configured to reduce inter-carrier interference (ICI) in an OFDM symbol in the frequency domain.

摘要翻译： OFDM电信系统包括发射机和接收机。 接收机包括被配置为减少频域中的OFDM符号中的载波间干扰（ICI）的消除器。

公开(公告)号：US20060221810A1

公开(公告)日：2006-10-05

申请号：US11372394

申请日：2006-03-08

申请人： Bojan Vrcelj ,  Fuyun Ling ,  Raghuraman Krishnamoorthi ,  Vinay Murthy

发明人： Bojan Vrcelj ,  Fuyun Ling ,  Raghuraman Krishnamoorthi ,  Vinay Murthy

IPC分类号： H04J11/00 ,  H04J3/06

CPC分类号： H04L27/2656 ,  H04L27/2663 ,  H04L27/2665 ,  H04L27/2675 ,  H04L27/2695

摘要： A method for synchronizing timing of a receiver to a received orthogonal frequency division multiplexing (OFDM) signal is disclosed. A first timing acquisition is performed with a first received time division multiplexed (TDM) pilot to determine a course timing estimate of the received OFDM signal. A second timing acquisition is performed with a second TDM pilot to determine a fine timing estimate for a OFDM symbol of the received OFDM signal. In the second timing acquisition, the accumulated energy of channel taps over a detection window is determined and a trailing edge of the accumulated energy curve is detected. A Fourier transform (FT) collection window location for subsequent OFDM symbols is adjusted according to the trailing edge information.

摘要翻译： 公开了一种用于使接收机的定时与接收的正交频分复用（OFDM）信号同步的方法。 利用第一接收时分复用（TDM）导频执行第一定时获取，以确定所接收的OFDM信号的路线定时估计。 用第二TDM导频执行第二定时获取，以确定接收到的OFDM信号的OFDM符号的精确定时估计。 在第二定时获取中，确定在检测窗口上的通道抽头的累积能量，并且检测累积能量曲线的后沿。 根据后沿信息调整后续OFDM符号的傅立叶变换（FT）收集窗口位置。

公开(公告)号：US20060215778A1

公开(公告)日：2006-09-28

申请号：US11372931

申请日：2006-03-09

申请人： Vinay Murthy ,  Alok Gupta ,  Seong Taek Chung ,  Fuyun Ling

发明人： Vinay Murthy ,  Alok Gupta ,  Seong Taek Chung ,  Fuyun Ling

IPC分类号： H04K1/10

CPC分类号： G06F1/0353 ,  H04L5/0007 ,  H04L5/0048 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2675 ,  H04L27/2678

摘要： Techniques for performing frequency control in an OFDM system are described. In one aspect, frequency acquisition is performed based on a received pilot, and frequency tracking is performed based on received OFDM symbols. For frequency acquisition, an initial frequency error estimate may be derived based on the received pilot, and an automatic frequency control (AFC) loop may be initialized with the initial frequency error estimate. For frequency tracking, a frequency error estimate may be derived for each received OFDM symbol, and the AFC loop may be updated with the frequency error estimate. Frequency error in input samples is corrected by the AFC loop with the initial frequency error estimate as well as the frequency error estimate for each received OFDM symbol. In another aspect, a variable number of samples of a received OFDM symbol are selected, e.g., based on the received OFDM symbol timing, for use for frequency error estimation.

摘要翻译： 描述在OFDM系统中执行频率控制的技术。 在一个方面，基于接收到的导频执行频率采集，并且基于接收的OFDM符号执行频率跟踪。 对于频率获取，可以基于接收到的导频来导出初始频率误差估计，并且可以利用初始频率误差估计来初始化自动频率控制（AFC）循环。 对于频率跟踪，可以针对每个接收的OFDM符号导出频率误差估计，并且可以用频率误差估计来更新AFC循环。 通过具有初始频率误差估计的AFC回路以及每个接收的OFDM符号的频率误差估计来校正输入采样中的频率误差。 在另一方面，例如基于所接收的OFDM符号定时，选择接收到的OFDM符号的可变数目的样本，以用于频率误差估计。