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1. 发明授权

US08014267B2 Methods and apparatus for backwards compatible communication in a multiple input multiple output communication system with lower order receivers 有权
标题翻译：在具有低阶接收机的多输入多输出通信系统中用于向后兼容通信的方法和装置
公开(公告)号：US08014267B2
公开(公告)日：2011-09-06
申请号：US10562619
申请日：2004-06-30
申请人： Jan Boer , Bas Driesen , Tim Schenk , Allert Van Zelst
发明人： Jan Boer , Bas Driesen , Tim Schenk , Allert Van Zelst
IPC分类号： H04J11/00 , H04L27/04 , H03C7/02
CPC分类号： H04B7/0413 , H04B7/0684 , H04L1/06 , H04L25/0202 , H04L25/0226 , H04L27/2613
摘要： A method and apparatus are disclosed for transmitting symbols in a multiple antenna wireless communication system, such that the symbols can be interpreted by a lower order receiver (i.e., a receiver having a fewer number of antennas than the transmitter). For example, subcarriers from one or more symbols can be transmitted such that each of the subcarriers are active on only one of the antennas at a given time. In one implementation, the subcarriers are diagonally loaded across logically adjacent antennas. The symbols can include one or more long training symbols and optionally a SIGNAL field that indicates a duration that a receiver should defer until a subsequent transmission. In this manner, a transmitter in accordance with the present invention may be backwards compatible with a lower order receiver and a lower order receiver can interpret the transmitted symbols or defer for an appropriate duration.
摘要翻译：公开了用于在多天线无线通信系统中发送符号的方法和装置，使得符号可以由较低阶接收机（即，具有比发射机更少数量的天线的接收机）来解释。例如，可以发送来自一个或多个符号的子载波，使得每个子载波在给定时间仅在一个天线上是有效的。在一个实现中，副载波在逻辑上相邻的天线之间被对角地加载。符号可以包括一个或多个长训练符号和可选的SIGNAL字段，其指示接收机延迟直到后续传输的持续时间。以这种方式，根据本发明的发射机可以与较低阶接收机向后兼容，而低阶接收机可以解释所发送的符号或延迟适当的持续时间。

2. 发明授权

US09325532B2 Method and apparatus for communicating symbols in a multiple input multiple output communication system using interleaved subcarriers across a plurality of antennas 有权
标题翻译：在多输入多输出通信系统中使用穿过多个天线的交错子载波传送符号的方法和装置
公开(公告)号：US09325532B2
公开(公告)日：2016-04-26
申请号：US10562618
申请日：2004-06-30
申请人： Jan Boer , Bas Driesen , Tim Schenk , Allert Van Zelst
发明人： Jan Boer , Bas Driesen , Tim Schenk , Allert Van Zelst
IPC分类号： H04M1/00 , H04L25/02 , H04W16/28 , H04B7/06 , H04W16/24 , H04L5/00 , H04B7/04
CPC分类号： H04L25/0232 , H04B7/0413 , H04B7/0617 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/0226 , H04W16/24 , H04W16/28
摘要： A method and apparatus are provided for transmitting one or more symbols in a multiple antenna wireless communication system. Subcarriers from one or more symbols are interleaved across a plurality of antennas. The symbols may be, for example, long or short training symbols based on a single-antenna long or short training symbol, respectively, and wherein each subsequent subcarrier from the single-antenna training symbol is positioned in a training symbol for a logically adjacent antenna. One or more additional subcarriers may be inserted in at least one of the plurality of symbols to allow nulled subcarriers to be estimated using an interpolation-based channel estimation technique. The remaining portions of a header, as well as the data sequences of a packet, may also be diagonally loaded.
摘要翻译：提供一种在多天线无线通信系统中发送一个或多个符号的方法和装置。来自一个或多个符号的子载波在多个天线之间交织。符号可以是例如分别基于单天线长或短训练符号的长或短训练符号，并且其中来自单天线训练符号的每个后续子载波被定位在用于逻辑相邻天线的训练符号中。可以在多个符号中的至少一个中插入一个或多个附加子载波，以允许使用基于插值的信道估计技术来估计零位副载波。报头的剩余部分以及分组的数据序列也可以对角地加载。

3. 发明申请

US20060252386A1 Methods and apparatus for backwards compatible communication in a multiple input multiple output communication system with lower order receivers 有权
标题翻译：在具有低阶接收机的多输入多输出通信系统中用于向后兼容通信的方法和装置
公开(公告)号：US20060252386A1
公开(公告)日：2006-11-09
申请号：US10562619
申请日：2004-06-30
申请人： Jan Boer , Bas Driesen , Tim Schenk , Allert Van Zelst
发明人： Jan Boer , Bas Driesen , Tim Schenk , Allert Van Zelst
IPC分类号： H04B1/02
CPC分类号： H04B7/0413 , H04B7/0684 , H04L1/06 , H04L25/0202 , H04L25/0226 , H04L27/2613
摘要： A method and apparatus are disclosed for transmitting symbols in a multiple antenna wireless communication system, such that the symbols can be interpreted by a lower order receiver (i.e., a receiver having a fewer number of antennas than the transmitter). For example, subcarriers from one or more symbols can be transmitted such that each of the subcarriers are active on only one of the antennas at a given time. In one implementation, the subcarriers are diagonally loaded across logically adjacent antennas. The symbols can include one or more long training symbols and optionally a SIGNAL field that indicates a duration that a receiver should defer until a subsequent transmission. In this manner, a transmitter in accordance with the present invention may be backwards compatible with a lower order receiver and a lower order receiver can interpret the transmitted symbols or defer for an appropriate duration.
摘要翻译：公开了用于在多天线无线通信系统中发送符号的方法和装置，使得符号可以由较低阶接收机（即，具有比发射机更少数量的天线的接收机）来解释。例如，可以发送来自一个或多个符号的子载波，使得每个子载波在给定时间仅在一个天线上是有效的。在一个实现中，副载波在逻辑上相邻的天线之间被对角地加载。符号可以包括一个或多个长训练符号和可选的SIGNAL字段，其指示接收机延迟直到后续传输的持续时间。以这种方式，根据本发明的发射机可以与较低阶接收机向后兼容，而低阶接收机可以解释所发送的符号或延迟适当的持续时间。

4. 发明授权

US07885177B2 Methods and apparatus for backwards compatible communication in a multiple antenna communication system using time orthogonal symbols 有权
标题翻译：在使用时间正交符号的多天线通信系统中用于向后兼容通信的方法和装置
公开(公告)号：US07885177B2
公开(公告)日：2011-02-08
申请号：US10562620
申请日：2004-06-30
申请人： Robert John Kopmeiners , Tim Schenk , Allert Van Zelst
发明人： Robert John Kopmeiners , Tim Schenk , Allert Van Zelst
IPC分类号： H04J11/00 , H04B7/02
CPC分类号： H04L5/0023 , H04B7/0413 , H04B7/0684 , H04L1/06 , H04L5/0048 , H04L25/0204 , H04L25/0206 , H04L25/0226 , H04L27/2613
摘要： A method and apparatus are disclosed for transmitting symbols in a multiple antenna communication system according to a frame structure, such that the symbols can be interpreted by a lower order receiver (i.e., a receiver having a fewer number of antennas than the transmitter). The disclosed frame structure comprises a legacy preamble having at least one long training symbol and N-1 additional long training symbols that are transmitted on each of N transmit antennas. The legacy preamble may be, for example, an 802.11 a/g preamble that includes at least one short training symbol, at least one long training symbol and at least one SIGNAL field. A sequence of each of the long training symbols on each of the N transmit antennas are time orthogonal. The long training symbols can be time orthogonal by introducing a phase shift to each of long training symbols relative to one another.
摘要翻译：公开了一种用于根据帧结构在多天线通信系统中发送符号的方法和装置，使得符号可以由较低阶接收机（即，具有比发射机更少数量的天线的接收机）来解释。所公开的帧结构包括具有在N个发射天线中的每一个上发射的至少一个长训练符号和N-1个附加长训练符号的传统前同步码。传统前导码可以是例如包括至少一个短训练符号，至少一个长训练符号和至少一个信号字段的802.11a / g前导码。每个N个发射天线中的每个长训练符号的序列是时间正交的。长训练符号可以通过相对于彼此引入相对于每个长训练符号而进行时间正交。

5. 发明授权

US08050344B2 Beamforming techniques for MIMO communication systems 有权
标题翻译： MIMO通信系统的波束成形技术
公开(公告)号：US08050344B2
公开(公告)日：2011-11-01
申请号：US12502300
申请日：2009-07-14
申请人： Allert Van Zelst , D. J. Richard Van Nee , Vincent K. Jones
发明人： Allert Van Zelst , D. J. Richard Van Nee , Vincent K. Jones
IPC分类号： H04L27/28
CPC分类号： H04B7/0619 , H04B7/0434 , Y02D70/142 , Y02D70/444
摘要： Improved beamforming techniques are provided for use in MIMO (multiple-input, multiple-output) communication systems, including MIMO-OFDM systems. The techniques include: (1) determining beamforming (BF) weights using a smoothed singular value decomposition (SVD) of the channel matrix; (2) determining BF weights using a power-optimized minimum mean-square error (MMSE) technique when the number of available transmit antennas exceeds the number of signal streams; and (3) determining BF weights using a hybrid SVD-MMSE technique. Additional techniques for reducing the impulse response length of the BF weights and/or normalizing the power per transmit antenna or per data stream may be used in conjunction with these or other beamforming techniques.
摘要翻译：提供了改进的波束形成技术，用于包括MIMO-OFDM系统在内的MIMO（多输入多输出）通信系统。这些技术包括：（1）使用信道矩阵的平滑奇异值分解（SVD）来确定波束形成（BF）权重; （2）当可用发射天线的数量超过信号流数时，使用功率优化最小均方误差（MMSE）技术确定BF权重; 和（3）使用混合SVD-MMSE技术确定BF权重。可以结合这些或其他波束成形技术来使用用于减少BF加权的脉冲响应长度和/或使每个发射天线或每个数据流归一化功率的附加技术。

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