公开(公告)号：US20050163258A1

公开(公告)日：2005-07-28

申请号：US11022513

申请日：2004-12-22

申请人： Dhananjay Gore ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi

发明人： Dhananjay Gore ,  Ashok Mantravadi ,  Fuyun Ling ,  Krishna Mukkavilli ,  Raghuraman Krishnamoorthi

IPC分类号： H04L25/02 ,  H04L27/26 ,  H04B1/10

CPC分类号： H04L25/0224 ,  H04L25/0212 ,  H04L25/022

摘要： Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, time filtering is utilized. Time filtering is utilized to combat excess delay spread effects in channel estimation. The time filtering is performed in the presence of staggered pilots and helps in improving the channel estimate in the presence of excess delay spread.

摘要翻译： 描述了具有超延迟扩展的OFDM系统的导频传输和信道估计技术。 为了减轻多余延迟扩展的有害影响，利用时间滤波。 利用时间滤波来对付信道估计中的多余延迟扩散效应。 在存在交错导频的情况下执行时间滤波，并有助于在存在超延迟扩展的情况下改善信道估计。

公开(公告)号：US20070071122A1

公开(公告)日：2007-03-29

申请号：US11361085

申请日：2006-02-22

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

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

IPC分类号： H04K1/10

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：US20070070877A1

公开(公告)日：2007-03-29

申请号：US11361088

申请日：2006-02-22

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

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

IPC分类号： H04J11/00

CPC分类号： H04L27/0012 ,  H04L25/0206 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2601 ,  H04L27/2647

摘要： Systems and methodologies are described that facilitate monitoring transmitter performance in a wireless communication environment. If the received modulation symbols are unknown during transmitter monitoring, it may be necessary to determine the modulation symbols for each subcarrier. The modulation types can be evaluated over a subset of subcarriers having a consistent modulation type, to reduce the possibility of an erroneous modulation type determination to an extremely low level. A metric can be generated for each modulation type that indicates the likelihood of a particular modulation type for the subset of subcarriers. The modulation type can be selected based upon the metric and modulation symbols consistent with the modulation type can be used for the subset of subcarriers.

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。 如果在发射机监控期间接收到的调制符号是未知的，则可能需要确定每个子载波的调制符号。 调制类型可以在具有一致调制类型的子载波的子集上进行评估，以将错误调制类型确定的可能性降低到非常低的水平。 可以为指示子载波子集的特定调制类型的可能性的每种调制类型生成度量。 可以基于度量来选择调制类型，并且可以将与调制类型一致的调制符号用于子载波的子集。

公开(公告)号：US20060178755A1

公开(公告)日：2006-08-10

申请号：US11330652

申请日：2006-01-11

申请人： Fuyun Ling ,  Seong Chung ,  Jinxia Bai ,  Thomas Sun

发明人： Fuyun Ling ,  Seong Chung ,  Jinxia Bai ,  Thomas Sun

IPC分类号： G05B15/00

CPC分类号： H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

摘要： A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

摘要翻译： 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常被定义为k1≤2或k2≥2。 该方法选择k1 <2> 2和k2 <2>之间的不匹配能量比（k <2> 2），并为双层QPSK涡轮增益产生位LLR值 使用不匹配的k <2>能量比进行解码。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k <2>为约5.0625。 或者说，通过确定k1 <2> 2和k2 <2>之间的近似中点，所选择的不匹配的k 2 2能量比。

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：US07660368B2

公开(公告)日：2010-02-09

申请号：US11330652

申请日：2006-01-11

申请人： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

发明人： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

IPC分类号： H03D3/22

CPC分类号： H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

摘要： A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

摘要翻译： 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常定义为k12或k22。 该方法选择k12和k22之间的不匹配能量比（k2），并使用不匹配的k2能量比生成双层QPSK turbo解码的比特LLR值。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k2为约5.0625。 或者说，通过确定k12和k22之间的近似中点，选择的不匹配的k2能量比。

公开(公告)号：US20070263712A1

公开(公告)日：2007-11-15

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： H04B3/46 ,  H04Q1/20 ,  H04B17/00

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：US08102949B2

公开(公告)日：2012-01-24

申请号：US12646543

申请日：2009-12-23

申请人： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

发明人： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

IPC分类号： H03D3/22

CPC分类号： H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

摘要： A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

摘要翻译： 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常定义为k12或k22。 该方法选择k12和k22之间的不匹配能量比（k2），并使用不匹配的k2能量比生成双层QPSK turbo解码的比特LLR值。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k2为约5.0625。 或者说，通过确定k12和k22之间的近似中点，选择的不匹配的k2能量比。

公开(公告)号：US20100098192A1

公开(公告)日：2010-04-22

申请号：US12646543

申请日：2009-12-23

申请人： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

发明人： Fuyun Ling ,  Seong Taek Chung ,  Jinxia Bai ,  Thomas Sun

IPC分类号： H03D3/22 ,  H04J11/00

CPC分类号： H04L27/3488 ,  H04L1/0045 ,  H04L1/0065 ,  H04L1/0066 ,  H04L27/2604 ,  H04L2001/0098

摘要： A system and method are provided for generating bit log likelihood ratio (LLR) values for two-layered Quadrature Phase-Shift Keying (QPSK) turbo decoding in a wireless communications user terminal (UT). The method includes receiving a two-layered QPSK signal with an energy ratio that is unknown, but typically defined as either k12 or k22. The method selects a mismatched energy ratio (k2) between k12 and k22, and generating bit LLR values for two-layered QPSK turbo decoding, using the mismatched k2 energy ratio. For example, if the received two-layered QPSK signal is known to have an energy ratio of about 4 or about 6.25. Then, k2 is selected to be about 5.0625. Alternately stated, the mismatched k2 energy ratio in selected by determining the approximate midpoint between k12 and k22.

摘要翻译： 提供了一种用于在无线通信用户终端（UT）中生成用于双层正交相移键控（QPSK）turbo解码的比特对数似然比（LLR）值的系统和方法。 该方法包括以未知的能量比接收两层QPSK信号，但通常定义为k12或k22。 该方法选择k12和k22之间的不匹配能量比（k2），并使用不匹配的k2能量比生成双层QPSK turbo解码的比特LLR值。 例如，如果已知所接收的两层QPSK信号具有约4或约6.25的能量比。 然后，选择k2为约5.0625。 或者说，通过确定k12和k22之间的近似中点，选择的不匹配的k2能量比。