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1. 发明授权

US08121220B1 Apparatus and method for reduced complexity maximum likelihood MIMO detection 有权
标题翻译：降低复杂度最大似然MIMO检测的装置和方法
公开(公告)号：US08121220B1
公开(公告)日：2012-02-21
申请号：US12135054
申请日：2008-06-06
申请人： Kai Shi , Ning Zhang , Tao-Fei Samuel Ng
发明人： Kai Shi , Ning Zhang , Tao-Fei Samuel Ng
IPC分类号： H03K9/00 , H04L27/00
CPC分类号： H04L25/03197 , H04B7/0413 , H04L1/06 , H04L25/0246 , H04L25/03292 , H04L25/03318 , H04L2025/03426
摘要： In a multiple-input multiple-output communication system, a transmit symbol vector and a set of soft decision metrics may be estimated using a reduced complexity maximum likelihood (ML) detection method based on a receive symbol vector and a QR decomposition of a set of permuted channel matrices. The reduced complexity ML detection method may use a different permuted channel matrix to estimate each transmit symbol in a transmit symbol vector. A set of error distances may be calculated for the estimated transmit symbol vector, each error distance calculated choosing a different value from a signal constellation subset for a transmit symbol in the estimated transmit symbol vector. A soft decision metric may be calculated using the elements from the set of error distances. In some embodiments the transmit symbols of a transmit symbol vector and the soft decision metrics for each transmit symbol may be determined in parallel.
摘要翻译：在多输入多输出通信系统中，可以使用基于接收符号矢量的降低的复杂度最大似然（ML）检测方法来估计发送符号向量和一组软判决度量，置换通道矩阵。降低复杂度ML检测方法可以使用不同的置换信道矩阵来估计发射符号向量中的每个发射符号。可以针对估计的发射符号向量计算一组误差距离，每个误差距离被选择与估计的发射符号向量中的发射符号的信号星座子集不同的值。可以使用来自误差距离集合的元素来计算软判决度量。在一些实施例中，可以并行确定发射符号向量的发射符号和每个发射符号的软判决度量。

2. 发明申请

US20100111212A1 Decision Feedback Channel Estimation And Pilot Tracking for OFDM Systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US20100111212A1
公开(公告)日：2010-05-06
申请号：US12688733
申请日：2010-01-15
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
IPC分类号： H04L27/28 , H04L27/00
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

3. 发明授权

US08000227B2 Decision feedback channel estimation and pilot tracking for OFDM systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US08000227B2
公开(公告)日：2011-08-16
申请号：US12688733
申请日：2010-01-15
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
IPC分类号： H04J11/00
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance.Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

4. 发明授权

US08737540B1 System and method for providing reduced complexity maximum likelihood MIMO detection 有权
标题翻译：用于提供降低复杂度的最大似然MIMO检测的系统和方法
公开(公告)号：US08737540B1
公开(公告)日：2014-05-27
申请号：US13184464
申请日：2011-07-15
申请人： Kai Shi , Felix Bitterli , Richard Mosko , Tao-Fei Samuel Ng
发明人： Kai Shi , Felix Bitterli , Richard Mosko , Tao-Fei Samuel Ng
IPC分类号： H04L27/06
CPC分类号： H04L1/0047 , H04B7/0413 , H04L1/06 , H04L25/0204 , H04L25/0246 , H04L25/067
摘要： This disclosure is directed to wireless or wired multiple-input multiple-output communication systems, in which a transmit symbol vector and a set of soft decision metrics are estimated using a reduced complexity maximum likelihood (ML) detection method based on a receive symbol vector and a QR decomposition of a set of permuted channel matrices. The QR decomposition can be performed by a series of CORDIC operations. Preferably, the modified receive vector and upper triangular matrix streams are scaled by a weighting vector to help compensate for transmit and receive side noise. Also preferably, the soft decision metric set related to the reliability of transmitted bits is normalized.
摘要翻译：本公开涉及无线或有线多输入多输出通信系统，其中使用基于接收符号向量的降低的复杂度最大似然（ML）检测方法来估计发射符号向量和一组软判决度量，并且一组置换的信道矩阵的QR分解。 QR分解可以通过一系列CORDIC操作来执行。优选地，修改的接收向量和上三角矩阵流由加权向量缩放以帮助补偿发射和接收侧噪声。还优选地，与发送的比特的可靠性有关的软判决度量标准化。

5. 发明授权

US07693036B2 Decision feedback channel estimation and pilot tracking for OFDM systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US07693036B2
公开(公告)日：2010-04-06
申请号：US11150619
申请日：2005-06-10
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
IPC分类号： H04J11/00
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

6. 发明授权

US07039004B2 Decision feedback channel estimation and pilot tracking for OFDM systems 有权
标题翻译： OFDM系统的决策反馈信道估计和导频跟踪
公开(公告)号：US07039004B2
公开(公告)日：2006-05-02
申请号：US10263415
申请日：2002-10-01
申请人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
发明人： Qinfang Sun , Won-Joon Choi , Jeffrey M. Gilbert , Ning Zhang , Yi-Hsiu Wang , Tao-Fei Samuel Ng
IPC分类号： H04J11/00
CPC分类号： H04L25/022 , H04L25/0236 , H04L27/2647 , H04L2025/03522
摘要： Current OFDM systems use a limited number of symbols and/or sub-channels to provide approximations for channel estimations and pilot tracking, i.e. phase estimations. For example, two training symbols in the preamble of a data packet are used to provide channel estimation. Four of the fifty-four sub-channels are reserved for providing phase estimation. However, noise and other imperfections can cause errors in both of these estimations, thereby degrading system performance. Advantageously, decision feedback mechanisms can be provided to significantly improve channel estimation and pilot tracking in OFDM systems. The decision feedback mechanisms can use data symbols in the data packet to improve channel estimation as well as data sub-channels to improve pilot tracking.
摘要翻译：当前OFDM系统使用有限数量的符号和/或子信道来提供用于信道估计和导频跟踪（即相位估计）的近似。例如，使用数据分组的前导码中的两个训练符号来提供信道估计。五十四个子通道中的四个保留用于提供相位估计。然而，噪声和其他缺陷可能会导致这两种估计中的错误，从而降低系统性能。有利地，可以提供决策反馈机制以显着地改善OFDM系统中的信道估计和导频跟踪。决策反馈机制可以使用数据分组中的数据符号来改进信道估计以及数据子信道，以改进导频跟踪。

7. 发明授权

US06999443B1 Hardware MAC 有权
标题翻译：硬件MAC
公开(公告)号：US06999443B1
公开(公告)日：2006-02-14
申请号：US09663045
申请日：2000-09-15
申请人： Jeffrey Scott Kuskin , Tao-Fei Samuel Ng , Andrew M. Davidson
发明人： Jeffrey Scott Kuskin , Tao-Fei Samuel Ng , Andrew M. Davidson
IPC分类号： H04Q7/24
CPC分类号： H04L63/162
摘要： A Hardware MAC (Media Access Control) unit implements time-critical functions according the 802.11 standard for telecommunications, thereby enhancing system performance. The MAC layer includes three sub-layers: MLME (MAC Sublayer Management Entity), which connects the MAC unit with the host CPU, FTM (Frame Transition Manager), which connects the MAC unit with the network, and FLPM (Frame Level Protocol Manager), which internally connects the MLME sub-layer with the FTM sub-layer. In particular, the FLPM manager includes time-critical and non-time-critical functions that are customarily implemented in software on the MAC by a MAC CPU (Central Processing Unit). The hardware MAC implements time-critical FLPM functions in hardware on the MAC and implements non-time-critical FLPM functions in software on the host CPU so that requirements for processing software on the MAC preferably may be altogether eliminated or alternatively may be substantially reduced.
摘要翻译：硬件MAC（媒体访问控制）单元根据802.11电信标准执行时间关键功能，从而提高系统性能。 MAC层包括三个子层：将MAC单元与主机CPU连接的MLME（MAC子层管理实体），将MAC单元与网络连接的FTM（帧过渡管理器）和FLPM（帧级协议管理器），其内部连接MLME子层与FTM子层。特别地，FLPM管理器包括通过MAC CPU（中央处理单元）在MAC上的软件中通常实现的时间关键和非时间关键功能。硬件MAC在MAC上的硬件中实现时间关键的FLPM功能，并且在主机CPU上的软件中实现非时间关键的FLPM功能，所以优选地，可以完全消除对MAC上的处理软件的要求，或者可以大大减少。

8. 发明授权

US06940865B2 System and method for interleaving frames with different priorities 有权
标题翻译：用于交织具有不同优先级的帧的系统和方法
公开(公告)号：US06940865B2
公开(公告)日：2005-09-06
申请号：US09925978
申请日：2001-08-09
申请人： Jeffrey Scott Kuskin , Tao-Fei Samuel Ng , Andrew M. Davidson
发明人： Jeffrey Scott Kuskin , Tao-Fei Samuel Ng , Andrew M. Davidson
IPC分类号： G06F13/30 , H04L12/56 , H04L12/28
CPC分类号： H04L47/6215 , G06F13/30 , H04L47/50 , H04L47/564 , H04L49/90 , H04L49/901 , H04L49/9047
摘要： A method of queue management includes: adding entries having a first priority to a first software queue; adding entries having a second priority to a second software queue; reading entries from the first software queue to a physical queue; at a threshold time, flushing entries from the physical queue; after the act of flushing the physical queue, reading entries from the second software queue to the physical queue until a termination criterion is satisfied; after the termination criterion is satisfied, reading entries from the first software queue to the physical queue; and transmitting entries from the physical queue to a network.
摘要翻译：队列管理的方法包括：将具有第一优先级的条目添加到第一软件队列; 将具有第二优先级的条目添加到第二软件队列; 从第一个软件队列读取条目到一个物理队列; 在阈值时间，从物理队列刷新条目; 在刷新物理队列的动作之后，从第二个软件队列读取条目到物理队列，直到满足终止标准; 在满足终止标准之后，从第一个软件队列读取条目到物理队列; 并将条目从物理队列发送到网络。

9. 发明授权

US07185196B1 Key caching system 有权
标题翻译：关键缓存系统
公开(公告)号：US07185196B1
公开(公告)日：2007-02-27
申请号：US09662991
申请日：2000-09-15
申请人： Jeffrey Scott Kuskin , Tao-Fei Samuel Ng , Deepak Prabhakar Dhamdhere , Fiona J. Cain , Andrew M. Davidson
发明人： Jeffrey Scott Kuskin , Tao-Fei Samuel Ng , Deepak Prabhakar Dhamdhere , Fiona J. Cain , Andrew M. Davidson
IPC分类号： H04L9/00 , H04L29/06 , H04L29/00
CPC分类号： H04L63/0428 , H04L1/1829 , H04L29/06 , H04L29/12783 , H04L61/35 , H04L63/062 , H04L63/164 , H04L69/12 , H04W8/26 , H04W12/02 , H04W12/04 , H04W84/12
摘要： A key-caching system retrieves actively used keys from a relatively fast cache memory for fast processing of wireless communications. Additional keys are stored in relatively slow system memory that has high storage capacity. As keys become needed for active use, the keys are retrieved from the system memory and stored in the cache memory. By using active memory for keys actively being used, system performance is enhanced. By using system memory for keys not being used, a greater number of keys are available for transfer to the cache and subsequent active use.
摘要翻译：密钥缓存系统从相对较快的高速缓冲存储器中检索主动使用的密钥，用于无线通信的快速处理。附加键存储在具有高存储容量的相对较慢的系统存储器中。由于密钥成为主动使用所需的密钥，所以从系统存储器检索密钥并将其存储在高速缓冲存储器中。通过使用主动使用的主动内存，可以提高系统性能。通过对未使用的密钥使用系统内存，可以使用更多数量的密钥来传输到缓存和随后的主动使用。

10. 发明授权

US07400733B1 Key refresh at the MAC layer 有权
标题翻译：密钥在MAC层刷新
公开(公告)号：US07400733B1
公开(公告)日：2008-07-15
申请号：US10086029
申请日：2002-02-27
申请人： Nancy Cam-Winget , Tao-Fei Samuel Ng , Kevin Hayes
发明人： Nancy Cam-Winget , Tao-Fei Samuel Ng , Kevin Hayes
IPC分类号： H04L29/08 , H04L29/00
CPC分类号： H04L63/06 , H04L2463/061
摘要： A method for encrypted communications between a first transceiver and a second transceiver is provided. The method includes sending from a first transceiver to a second transceiver a request to initiate derivation of a new encryption key. The request to initiate a new encryption key derivation includes an exchange threshold indicative of when the new encryption key is to be used to encrypt communication packets.
摘要翻译：提供了一种用于第一收发器和第二收发器之间的加密通信的方法。该方法包括从第一收发器向第二收发器发送启动新加密密钥的推导的请求。启动新的加密密钥导出的请求包括指示何时将使用新的加密密钥来加密通信分组的交换阈值。

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