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1. 发明申请

US20120321017A1 TRANSMISSION BEAMFORMING METHOD AND APPARATUS IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING-BASED MIMO WIRELESS SYSTEM 有权
标题翻译：基于频分多路复用的MIMO无线系统中的传输波束形成方法及装置
公开(公告)号：US20120321017A1
公开(公告)日：2012-12-20
申请号：US13520794
申请日：2011-01-07
申请人： Yong-Hwan Lee , O-Jin Kwon , Keon-Wook Lee
发明人： Yong-Hwan Lee , O-Jin Kwon , Keon-Wook Lee
IPC分类号： H04B15/00
CPC分类号： H04B7/0639 , H04B7/0641 , H04B7/0663 , H04L5/0023 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/03949
摘要： The present invention relates to a transmission beamforming method and apparatus in an orthogonal frequency division multiplexing (OFDM)-based MIMO wireless system. In particular, the present invention relates to a transmission beamforming method in an OFDM-based MIMO wireless system and an apparatus therefor, wherein the transmission beamforming method comprises: estimating a channel from a received pilot signal and obtaining time for the estimating channel and 2D channel correlation information of a frequency band; obtaining estimated channel information based on the channel correlation information; obtaining differential information that represents a difference between the current channel and the estimated channel and quantizing the differential information; and generating a transmission beam weight by using a predefined code book from the quantized differential information. The present invention may also provide a method and apparatus for reducing the channel quantization error and feedback load by employing the OFDM-based MIMO in a wireless communication system using a transmission beamforming scheme, wherein a receiver estimates current channel information by using time and 2D channel correlation information of a frequency based on the previous channel information, compares the estimated current channel information with an actual channel and then feeds back the differential channel information, i.e., the difference between the estimated channel and the actual channel, to a transmitter.
摘要翻译：本发明涉及一种基于正交频分复用（OFDM）的MIMO无线系统中的发射波束形成方法和装置。具体地说，本发明涉及一种基于OFDM的MIMO无线系统中的发送波束形成方法及其装置，其中，所述发送波束形成方法包括：从接收的导频信号估计信道，并获得估计信道和2D信道的时间频带的相关信息; 基于信道相关信息获取估计信道信息; 获取表示当前信道与估计信道之间的差分的差分信息并量化差分信息; 以及通过使用来自所述量化的差分信息的预定义码本来生成传输束权重。本发明还可以提供一种通过在使用传输波束成形方案的无线通信系统中采用基于OFDM的MIMO来减少信道量化误差和反馈负载的方法和装置，其中接收机通过使用时间和2D信道来估计当前信道信息基于先前信道信息的频率的相关信息，将估计的当前信道信息与实际信道进行比较，然后将差分信道信息（即估计信道与实际信道之间的差）反馈给发射机。

2. 发明授权

US08873664B2 Transmission beamforming method and apparatus in an orthogonal frequency division multiplexing-based MIMO wireless system 有权
标题翻译：基于正交频分复用的MIMO无线系统中的传输波束成形方法和装置
公开(公告)号：US08873664B2
公开(公告)日：2014-10-28
申请号：US13520794
申请日：2011-01-07
申请人： Yong-Hwan Lee , O-Jin Kwon , Keon-Wook Lee
发明人： Yong-Hwan Lee , O-Jin Kwon , Keon-Wook Lee
IPC分类号： H04B7/02 , H04B7/06 , H04L5/00 , H04L25/02 , H04L25/03
CPC分类号： H04B7/0639 , H04B7/0641 , H04B7/0663 , H04L5/0023 , H04L25/0204 , H04L25/022 , H04L25/0224 , H04L25/03949
摘要： The present invention relates to a transmission beamforming method and apparatus in an orthogonal frequency division multiplexing (OFDM)-based MIMO wireless system. In particular, the present invention relates to a transmission beamforming method in an OFDM-based MIMO wireless system and an apparatus therefor, wherein the transmission beamforming method comprises: estimating a channel from a received pilot signal and obtaining time for the estimating channel and 2D channel correlation information of a frequency band; obtaining estimated channel information based on the channel correlation information; obtaining differential information that represents a difference between the current channel and the estimated channel and quantizing the differential information; and generating a transmission beam weight by using a predefined code book from the quantized differential information. The present invention may also provide a method and apparatus for reducing the channel quantization error and feedback load by employing the OFDM-based MIMO in a wireless communication system using a transmission beamforming scheme, wherein a receiver estimates current channel information by using time and 2D channel correlation information of a frequency based on the previous channel information, compares the estimated current channel information with an actual channel and then feeds back the differential channel information, i.e., the difference between the estimated channel and the actual channel, to a transmitter.
摘要翻译：本发明涉及一种基于正交频分复用（OFDM）的MIMO无线系统中的发射波束形成方法和装置。具体地说，本发明涉及一种基于OFDM的MIMO无线系统中的发送波束形成方法及其装置，其中，所述发送波束形成方法包括：从接收的导频信号估计信道，并获得估计信道和2D信道的时间频带的相关信息; 基于信道相关信息获取估计信道信息; 获取表示当前信道与估计信道之间的差分的差分信息并量化差分信息; 以及通过使用来自所述量化的差分信息的预定义码本来生成传输束权重。本发明还可以提供一种通过在使用传输波束成形方案的无线通信系统中采用基于OFDM的MIMO来减少信道量化误差和反馈负载的方法和装置，其中接收机通过使用时间和2D信道来估计当前信道信息基于先前信道信息的频率的相关信息，将估计的当前信道信息与实际信道进行比较，然后将差分信道信息（即估计信道与实际信道之间的差）反馈给发射机。

3. 发明授权

US08693568B2 Method and apparatus for estimating channel using dedicated pilot signal in OFDM-based wireless communication system 有权
标题翻译：在基于OFDM的无线通信系统中使用专用导频信号估计信道的方法和装置
公开(公告)号：US08693568B2
公开(公告)日：2014-04-08
申请号：US13479939
申请日：2012-05-24
申请人： Yong-Hwan Lee , Han-Jun Park , Keon-Wook Lee
发明人： Yong-Hwan Lee , Han-Jun Park , Keon-Wook Lee
IPC分类号： H04B7/02
CPC分类号： H04L25/0228 , H04L25/0208
摘要： The invention relates to a method for channel estimation using a dedicated pilot signal in an OFDM-based communication system with multi-antenna transmission techniques. The receiver estimates the statistical characteristics of a virtual channel generated by beamforming by exploiting the statistical characteristics of common pilot channel, determines the optimum dedicated pilot pattern, and estimates the channel from dedicated pilot signal transmitted in an optimum pattern by means of AMMSE interpolation. The invention minimizes the channel estimation error by exploiting the statistical characteristics of the virtual channel, and optimally determines the dedicated pilot pattern according to the operation environment to maximize the transmission performance in terms of the pilot signaling overhead and the channel estimation error. In particular, the invention is very effective in low signal-to-interference plus noise power ratio (SINR) operation environments.
摘要翻译：本发明涉及一种在具有多天线传输技术的基于OFDM的通信系统中使用专用导频信号进行信道估计的方法。接收器通过利用公共导频信道的统计特性来估计由波束成形产生的虚拟信道的统计特性，确定最佳专用导频模式，并且通过AMMSE插值从以最佳模式发送的专用导频信号估计信道。本发明通过利用虚拟信道的统计特性来最小化信道估计误差，并根据操作环境最佳地确定专用导频模式，以根据导频信令开销和信道估计误差来最大化传输性能。特别地，本发明在低信噪比加噪声功率比（SINR）操作环境中非常有效。

4. 发明申请

US20130034177A1 METHOD AND APPARATUS FOR ESTIMATING CHANNEL USING DEDICATED PILOT SIGNAL IN OFDM-BASED WIRELESS COMMUNICATION SYSTEM 有权
标题翻译：在基于OFDM的无线通信系统中使用专用导频信号估计信道的方法和装置
公开(公告)号：US20130034177A1
公开(公告)日：2013-02-07
申请号：US13479939
申请日：2012-05-24
申请人： Yong-Hwan Lee , Han-Jun Park , Keon-Wook Lee
发明人： Yong-Hwan Lee , Han-Jun Park , Keon-Wook Lee
IPC分类号： H04L27/28
CPC分类号： H04L25/0228 , H04L25/0208
摘要： The invention relates to a method for channel estimation using a dedicated pilot signal in an OFDM-based communication system with multi-antenna transmission techniques. The receiver estimates the statistical characteristics of a virtual channel generated by beamforming by exploiting the statistical characteristics of common pilot channel, determines the optimum dedicated pilot pattern, and estimates the channel from dedicated pilot signal transmitted in an optimum pattern by means of AMMSE interpolation. The invention minimizes the channel estimation error by exploiting the statistical characteristics of the virtual channel, and optimally determines the dedicated pilot pattern according to the operation environment to maximize the transmission performance in terms of the pilot signaling overhead and the channel estimation error. In particular, the invention is very effective in low signal-to-interference plus noise power ratio (SINR) operation environments.
摘要翻译：本发明涉及一种在具有多天线传输技术的基于OFDM的通信系统中使用专用导频信号进行信道估计的方法。接收器通过利用公共导频信道的统计特性来估计由波束成形产生的虚拟信道的统计特性，确定最佳专用导频模式，并且通过AMMSE插值从以最佳模式发送的专用导频信号估计信道。本发明通过利用虚拟信道的统计特性来最小化信道估计误差，并根据操作环境最佳地确定专用导频模式，以根据导频信令开销和信道估计误差来最大化传输性能。特别地，本发明在低信噪比加噪声功率比（SINR）操作环境中非常有效。

5. 发明授权

US08009634B2 Apparatus and method for reducing other-cell interference in a broadband wireless communication system 有权
标题翻译：用于减少宽带无线通信系统中的其他小区干扰的装置和方法
公开(公告)号：US08009634B2
公开(公告)日：2011-08-30
申请号：US11766876
申请日：2007-06-22
申请人： Yong-Hwan Lee , Keon-Wook Lee
发明人： Yong-Hwan Lee , Keon-Wook Lee
IPC分类号： H04W4/00
CPC分类号： H04W36/30 , H04W36/18 , H04W88/02
摘要： An apparatus and method for avoiding interference in a broadband wireless communication system using FCS are provided. The apparatus and method include a receiver for monitoring channel statuses of neighbor cells using signals received from the neighbor cells, an active set generator for generating an active set according to at least one of the channel statuses of the neighbor cells, loads of the neighbor cells, and a performance gain from the neighbor cells, and a BS selector for selecting a serving cell from the active set according to the channel statuses of cells included in the active set. Accordingly, interference is reduced and reception performance is improved.
摘要翻译：提供了一种避免在使用FCS的宽带无线通信系统中的干扰的装置和方法。该装置和方法包括：使用从相邻小区接收的信号监视相邻小区的信道状态的接收机;根据相邻小区的信道状态中的至少一个生成活动集的活动集生成器，相邻小区的负载，以及来自相邻小区的性能增益;以及BS选择器，用于根据活动集中包括的小区的信道状态从活动集中选择服务小区。因此，降低了干扰，提高了接收性能。

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