公开(公告)号：US09225452B2

公开(公告)日：2015-12-29

申请号：US12710933

申请日：2010-02-23

申请人： Byoung-Hoon Kim ,  Yongbin Wei ,  Amir Dabbagh

发明人： Byoung-Hoon Kim ,  Yongbin Wei ,  Amir Dabbagh

IPC分类号： H04J13/00 ,  H04B7/06 ,  H04L25/02 ,  H04L27/26 ,  H04L5/00

CPC分类号： H04J13/0003 ,  H04B7/0421 ,  H04B7/0671 ,  H04B7/0678 ,  H04B7/068 ,  H04B7/0697 ,  H04B17/309 ,  H04B2201/70701 ,  H04J3/00 ,  H04J13/0022 ,  H04J13/0059 ,  H04J13/0062 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/0051 ,  H04L5/06 ,  H04L25/0204 ,  H04L25/0226 ,  H04L27/2601 ,  H04L27/2613 ,  H04L27/2636

摘要： Techniques for multiplexing pilots in a wireless transmission are described. In one aspect, a transmitter station generates multiple pilot sequences for multiple transmit antennas, with each pilot sequence comprising pilot symbols sent in the time domain on a different set of subcarriers. The transmitter station further generates multiple pilot transmissions for the transmit antennas based on the pilot sequences. In another aspect, a transmitter station generates multiple pilot sequences for multiple transmit antennas based on frequency-domain code division multiplexing (FD-CDM) of a Chu sequence defined by a transmitter-specific value. The transmitter station further generates multiple pilot transmissions for the transmit antennas based on the pilot sequences. In yet another aspect, a transmitter station generates multiple pilot transmissions for multiple transmit antennas based on a first multiplexing scheme and generates multiple data transmissions based on a second multiplexing scheme that is different from the first multiplexing scheme.

摘要翻译： 描述用于在无线传输中复用导频的技术。 在一个方面，发射机站为多个发射天线生成多个导频序列，每个导频序列包括在不同子载波集上的时域中发送的导频符号。 发射台还根据导频序列进一步为发射天线产生多个导频传输。 在另一方面，发射机站基于由发射机特定值定义的楚序列的频域码分复用（FD-CDM），为多个发射天线生成多个导频序列。 发射台还根据导频序列进一步为发射天线产生多个导频传输。 在另一方面，发射机站基于第一复用方案为多个发射天线生成多个导频传输，并且基于与第一复用方案不同的第二复用方案来生成多个数据传输。

公开(公告)号：US08130857B2

公开(公告)日：2012-03-06

申请号：US11624646

申请日：2007-01-18

申请人： Byoung-Hoon Kim ,  Yongbin Wei ,  Amir Dabbagh

发明人： Byoung-Hoon Kim ,  Yongbin Wei ,  Amir Dabbagh

IPC分类号： H04B7/08

CPC分类号： H04J13/0003 ,  H04B7/0421 ,  H04B7/0671 ,  H04B7/0678 ,  H04B7/068 ,  H04B7/0697 ,  H04B17/309 ,  H04B2201/70701 ,  H04J3/00 ,  H04J13/0022 ,  H04J13/0059 ,  H04J13/0062 ,  H04L5/0023 ,  H04L5/0026 ,  H04L5/0051 ,  H04L5/06 ,  H04L25/0204 ,  H04L25/0226 ,  H04L27/2601 ,  H04L27/2613 ,  H04L27/2636

摘要： Techniques for multiplexing pilots in a wireless transmission are described. In one aspect, a transmitter station generates multiple pilot sequences for multiple transmit antennas, with each pilot sequence comprising pilot symbols sent in the time domain on a different set of subcarriers. The transmitter station further generates multiple pilot transmissions for the transmit antennas based on the pilot sequences. In another aspect, a transmitter station generates multiple pilot sequences for multiple transmit antennas based on frequency-domain code division multiplexing (FD-CDM) of a Chu sequence defined by a transmitter-specific value. The transmitter station further generates multiple pilot transmissions for the transmit antennas based on the pilot sequences. In yet another aspect, a transmitter station generates multiple pilot transmissions for multiple transmit antennas based on a first multiplexing scheme and generates multiple data transmissions based on a second multiplexing scheme that is different from the first multiplexing scheme.

摘要翻译： 描述用于在无线传输中复用导频的技术。 在一个方面，发射机站为多个发射天线生成多个导频序列，每个导频序列包括在不同子载波集上的时域中发送的导频符号。 发射台还根据导频序列进一步为发射天线产生多个导频传输。 在另一方面，发射机站基于由发射机特定值定义的楚序列的频域码分复用（FD-CDM），为多个发射天线生成多个导频序列。 发射台还根据导频序列进一步为发射天线产生多个导频传输。 在另一方面，发射机站基于第一复用方案为多个发射天线生成多个导频传输，并且基于与第一复用方案不同的第二复用方案来生成多个数据传输。

公开(公告)号：US08594260B2

公开(公告)日：2013-11-26

申请号：US12856503

申请日：2010-08-13

申请人： Durga Prasad Malladi ,  Byoung-Hoon Kim ,  Yongbin Wei

发明人： Durga Prasad Malladi ,  Byoung-Hoon Kim ,  Yongbin Wei

IPC分类号： H04B1/10

CPC分类号： H04L25/03006 ,  H04L25/022 ,  H04L25/0228 ,  H04L2025/03375 ,  H04L2025/03783

摘要： One embodiment includes a method of receiving a transmitted signal. The method comprises receiving a signal transmitted over a channel. The signal comprises a known signal and an information signal. The method further includes determining at least one indicator of channel characteristics based at least in part on the portion of the known signal. The method further includes generating a first value indicative of the information signal based at least in part on the at least one indicator of the channel characteristics. The first value comprises an error signal. The method further comprises removing the error signal from the first estimate of the signal based at least in part on the portion of the known signal. Other embodiments include systems for performing the method and methods of making such systems.

摘要翻译： 一个实施例包括接收发射信号的方法。 该方法包括接收通过信道发送的信号。 信号包括已知信号和信息信号。 该方法还包括至少部分地基于已知信号的部分来确定信道特性的至少一个指示符。 该方法还包括至少部分地基于信道特性的至少一个指示符来生成指示信息信号的第一值。 第一个值包括一个误差信号。 该方法还包括至少部分地基于已知信号的部分从信号的第一估计中去除误差信号。 其他实施例包括用于执行制造这种系统的方法和方法的系统。

公开(公告)号：US20110280294A1

公开(公告)日：2011-11-17

申请号：US12778861

申请日：2010-05-12

申请人： Tao Luo ,  Yongbin Wei ,  Byoung-Hoon Kim

发明人： Tao Luo ,  Yongbin Wei ,  Byoung-Hoon Kim

IPC分类号： H04B17/00

CPC分类号： H04L25/0228 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/022

摘要： Methods and systems are disclosed for channel estimation and frequency tracking in mobile communication systems. Particularly, various ways of using the time domain impulse channel response based on the staggered frequency domain pilot tones are presented that enable rapid frequency error estimation and frequency tracking control. A mathematical model is developed that provides a convenient metric for evaluating tolerable frequency error, as well as modes for switching between CIR-based and SSC-based frequency tracking.

摘要翻译： 公开了用于移动通信系统中的信道估计和频率跟踪的方法和系统。 特别地，提出了使用基于交错频域导频音的时域脉冲信道响应的各种方式，其能够进行快速频率误差估计和频率跟踪控制。 开发了一种数学模型，为评估可容忍的频率误差提供了便利的度量，以及在基于CIR和基于SSC的频率跟踪之间切换的模式。

公开(公告)号：US08019032B2

公开(公告)日：2011-09-13

申请号：US11293527

申请日：2005-12-02

申请人： Durga Prasad Malladi ,  Byoung-Hoon Kim ,  Yongbin Wei

发明人： Durga Prasad Malladi ,  Byoung-Hoon Kim ,  Yongbin Wei

IPC分类号： H04B1/10

CPC分类号： H04L25/03006 ,  H04L25/022 ,  H04L25/0228 ,  H04L2025/03375 ,  H04L2025/03783

摘要： One embodiment includes a method of receiving a transmitted signal. The method comprises receiving a signal transmitted over a channel. The signal comprises a known signal and an information signal. The method further includes determining at least one indicator of channel characteristics based at least in part on the portion of the known signal. The method further includes generating a first value indicative of the information signal based at least in part on the at least one indicator of the channel characteristics. The first value comprises an error signal. The method further comprises removing the error signal from the first estimate of the signal based at least in part on the portion of the known signal. Other embodiments include systems for performing the method and methods of making such systems.

摘要翻译： 一个实施例包括接收发射信号的方法。 该方法包括接收通过信道发送的信号。 信号包括已知信号和信息信号。 该方法还包括至少部分地基于已知信号的部分来确定信道特性的至少一个指示符。 该方法还包括至少部分地基于信道特性的至少一个指示符来生成指示信息信号的第一值。 第一个值包括一个误差信号。 该方法还包括至少部分地基于已知信号的部分从信号的第一估计中去除误差信号。 其他实施例包括用于执行制造这种系统的方法和方法的系统。

公开(公告)号：US08494070B2

公开(公告)日：2013-07-23

申请号：US12778861

申请日：2010-05-12

申请人： Tao Luo ,  Yongbin Wei ,  Byoung-Hoon Kim

发明人： Tao Luo ,  Yongbin Wei ,  Byoung-Hoon Kim

IPC分类号： H04L5/12

CPC分类号： H04L25/0228 ,  H04L25/0204 ,  H04L25/0212 ,  H04L25/022

摘要： Methods and systems are disclosed for channel estimation and frequency tracking in mobile communication systems. Particularly, various ways of using the time domain impulse channel response based on the staggered frequency domain pilot tones are presented that enable rapid frequency error estimation and frequency tracking control. A mathematical model is developed that provides a convenient metric for evaluating tolerable frequency error, as well as modes for switching between channel impulse response (CIR)-based and secondary synchronization channel (SSC)-based frequency tracking.

摘要翻译： 公开了用于移动通信系统中的信道估计和频率跟踪的方法和系统。 特别地，提出了使用基于交错频域导频音的时域脉冲信道响应的各种方式，其能够进行快速频率误差估计和频率跟踪控制。 开发了一种数学模型，其提供用于评估可容忍的频率误差的方便度量，以及用于在基于信道脉冲响应（CIR）和基于次同步信道（SSC）的频率跟踪之间切换的模式。

公开(公告)号：US20110310952A1

公开(公告)日：2011-12-22

申请号：US12818976

申请日：2010-06-18

申请人： Yongbin Wei ,  Byoung-Hoon Kim ,  Durga Prasad Malladi

发明人： Yongbin Wei ,  Byoung-Hoon Kim ,  Durga Prasad Malladi

IPC分类号： H04L27/01

CPC分类号： H04L25/03146 ,  H04L25/03159

摘要： Techniques for performing decision feedback equalization are described. A feed-forward filter response and a feedback filter response are derived based on a channel estimate and a reliability parameter and further without constraint on the feedback filter response or with a constraint of no feedback for an on-time sample. The reliability parameter is indicative of the reliability of the feedback used for equalization and may be frequency dependent or frequency invariant. Different feed-forward and feedback filter responses may be derived with different constraints on the feedback filter and different assumptions for the reliability parameter. Equalization is performed with the feed-forward and feedback filter responses. If equalization is performed for multiple iterations then, for each iteration, the reliability parameter may be updated, the feed-forward and feedback filter responses may be derived based on the updated reliability parameter, and equalization may be performed with the filter responses for the iteration.

摘要翻译： 描述用于执行判决反馈均衡的技术。 基于信道估计和可靠性参数导出前馈滤波器响应和反馈滤波器响应，并且进一步不受反馈滤波器响应的约束或者对于准时采样的无反馈的约束。 可靠性参数表示用于均衡的反馈的可靠性，并且可以是频率依赖的或频率不变的。 不同的前馈和反馈滤波器响应可以通过反馈滤波器的不同约束和可靠性参数的不同假设得出。 使用前馈和反馈滤波器响应执行均衡。 如果对多次迭代执行均衡，那么对于每个迭代，可以更新可靠性参数，可以基于更新的可靠性参数导出前馈和反馈滤波器响应，并且可以用迭代的滤波器响应来执行均衡 。

公开(公告)号：US20110007694A1

公开(公告)日：2011-01-13

申请号：US12500517

申请日：2009-07-09

申请人： Byoung-Hoon Kim ,  Peter Gaal ,  Yongbin Wei

发明人： Byoung-Hoon Kim ,  Peter Gaal ,  Yongbin Wei

IPC分类号： H04W72/00 ,  H04K1/10

CPC分类号： H04L27/2657 ,  H04L27/2676 ,  H04L27/2695 ,  H04L27/3845

摘要： Systems and methodologies are described that facilitate computing discriminator signals for frequency tracking in wireless communications. The discriminator signal can be computed based at least in part on representations of a received signal shifted upward by a portion of a frequency tone and downward by the portion of the frequency tone. The shifted signals can be summed, and a dot product of the summed signals and a channel estimation of the original signal can be computed to remove uncertain frequency response due to fading. The discriminator signal can be computed as the imaginary portion of the dot product. A frequency error offset can be determined from the discriminator signal and applied to a receiver to tune alignment of the receiver with frequencies of received signals.

摘要翻译： 描述了在无线通信中促进用于频率跟踪的鉴别器信号的系统和方法。 可以至少部分地基于由向上移动频率一部分并且向下移动频率音调的部分的接收信号的表示来计算鉴别器信号。 移位的信号可以相加，并且可以计算求和的信号和原始信号的信道估计的积积以消除由于衰落引起的不确定的频率响应。 鉴别器信号可以计算为点积的虚部。 可以根据鉴别器信号确定频率误差偏移，并将其应用于接收机，以便将接收机与接收信号的频率进行对准。

公开(公告)号：US20060227859A1

公开(公告)日：2006-10-12

申请号：US11392306

申请日：2006-03-28

申请人： Yongbin Wei ,  Byoung-Hoon Kim ,  Durga Malladi

发明人： Yongbin Wei ,  Byoung-Hoon Kim ,  Durga Malladi

IPC分类号： H03H7/30

CPC分类号： H04L25/03063 ,  H04L25/03057 ,  H04L25/03159

摘要： Techniques for performing decision feedback equalization are described. A feed-forward filter response and a feedback filter response are derived based on a channel estimate and a reliability parameter and further without constraint on the feedback filter response or with a constraint of no feedback for an on-time sample. The reliability parameter is indicative of the reliability of the feedback used for equalization and may be frequency dependent or frequency invariant. Different feed-forward and feedback filter responses may be derived with different constraints on the feedback filter and different assumptions for the reliability parameter. Equalization is performed with the feed-forward and feedback filter responses. If equalization is performed for multiple iterations then, for each iteration, the reliability parameter may be updated, the feed-forward and feedback filter responses may be derived based on the updated reliability parameter, and equalization may be performed with the filter responses for the iteration.

公开(公告)号：US08385276B2

公开(公告)日：2013-02-26

申请号：US12500517

申请日：2009-07-09

申请人： Byoung-Hoon Kim ,  Peter Gaal ,  Yongbin Wei

发明人： Byoung-Hoon Kim ,  Peter Gaal ,  Yongbin Wei

IPC分类号： H04W4/00

CPC分类号： H04L27/2657 ,  H04L27/2676 ,  H04L27/2695 ,  H04L27/3845

摘要： Systems and methodologies are described that facilitate computing discriminator signals for frequency tracking in wireless communications. The discriminator signal can be computed based at least in part on representations of a received signal shifted upward by a portion of a frequency tone and downward by the portion of the frequency tone. The shifted signals can be summed, and a dot product of the summed signals and a channel estimation of the original signal can be computed to remove uncertain frequency response due to fading. The discriminator signal can be computed as the imaginary portion of the dot product. A frequency error offset can be determined from the discriminator signal and applied to a receiver to tune alignment of the receiver with frequencies of received signals.

摘要翻译： 描述了在无线通信中促进用于频率跟踪的鉴别器信号的系统和方法。 可以至少部分地基于由向上移动频率一部分并且向下移动频率音调的部分的接收信号的表示来计算鉴别器信号。 移位的信号可以相加，并且可以计算求和的信号和原始信号的信道估计的积积以消除由于衰落引起的不确定的频率响应。 鉴别器信号可以计算为点积的虚部。 可以根据鉴别器信号确定频率误差偏移，并将其应用于接收机，以便将接收机与接收信号的频率进行对准。