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    Modified preamble structure for IEEE 802.11A extensions to allow for coexistence and interoperability between 802.11A devices and higher data rate, MIMO or otherwise extended devices
    2.
    发明授权
    Modified preamble structure for IEEE 802.11A extensions to allow for coexistence and interoperability between 802.11A devices and higher data rate, MIMO or otherwise extended devices 有权
    用于IEEE 802.11A扩展的修改的前导码结构，以允许802.11A设备和较高数据速率，MIMO或其他扩展设备之间的共存和互操作性

    公开(公告)号：US08611457B2

    公开(公告)日：2013-12-17

    申请号：US13073701

    申请日：2011-03-28

    申请人： James Gardner ,  Vincent K. Jones, IV ,  D. J. Richard van Nee

    发明人： James Gardner ,  Vincent K. Jones, IV ,  D. J. Richard van Nee

    IPC分类号： H04L27/00

    CPC分类号： H04L1/06 ,  H04B7/04 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0066 ,  H04L5/0091 ,  H04L5/1438 ,  H04L25/0226 ,  H04L27/261 ,  H04L27/2613 ,  H04W16/14 ,  H04W24/00 ,  H04W28/22 ,  H04W84/12 ,  H04W92/18 ,  H04W99/00

    摘要： A modified preamble is used by extended devices that operate at higher rates, MIMO or other extensions relative to strict 802.11a-compliant devices. The extended devices might use multiple antenna techniques (MIMO), where multiple data streams are multiplexed spatially and/or multi-channel techniques, where an extended transmitter transmits using more than one 802.11 a channel at a time. Such extensions to IEEE 802.11 a can exist in extended devices. The modified preamble is usable for signaling, to legacy devices as well as extended devices, to indicate capabilities and to cause legacy devices or extended devices to defer to other devices such that the common communication channel is not subject to unnecessary interference. The modified preamble is also usable for obtaining MIMO channel estimates and/or multi-channel estimates. The modified preamble preferably includes properties that facilitate detection of conventional and/or extended modes (“mode detection”) and provides some level of coexistence with legacy IEEE 802.11 a devices.

    摘要翻译： 经修改的前同步码由相对于严格的符合802.11a标准的设备的较高速率，MIMO或其他扩展操作的扩展设备使用。 扩展的设备可以使用多天线技术（MIMO），其中多个数据流在空间和/或多信道技术上复用，其中扩展发射机一次使用多于一个802.11的信道。 IEEE 802.11a的这种扩展可以存在于扩展设备中。 经修改的前导码可用于对传统设备以及扩展设备进行信令，以指示能力并使遗留设备或扩展设备推迟到其他设备，使得公共通信信道不受不必要的干扰。 经修改的前导码也可用于获得MIMO信道估计和/或多信道估计。 经修改的前导码优选地包括便于检测常规和/或扩展模式（“模式检测”）并且提供与传统IEEE 802.11的设备的一些级别的性质的属性。

    Channel estimation for OFDM communication systems including IEEE 802.11A and extended rate systems
    5.
    发明授权
    Channel estimation for OFDM communication systems including IEEE 802.11A and extended rate systems 有权
    包括IEEE 802.11A和扩展速率系统在内的OFDM通信系统的信道估计

    公开(公告)号：US07453793B1

    公开(公告)日：2008-11-18

    申请号：US10823087

    申请日：2004-04-12

    申请人： Vincent K. Jones, IV ,  James Gardner ,  D. J. Richard van Nee

    发明人： Vincent K. Jones, IV ,  James Gardner ,  D. J. Richard van Nee

    IPC分类号： H04J11/00

    CPC分类号： H04L25/0232 ,  H04L25/0206 ,  H04L25/0216 ,  H04L25/022 ,  H04L25/061 ,  H04L27/2647

    摘要： Channel estimation techniques are provided for a receiver of a wireless communication system using orthogonal frequency division multiplexing (OFDM), including legacy 802.11a and various extended rate systems. Training signals are received from one or more receive antennas. An estimated channel impulse response is computed from the received training signals by reference to a training sequence. The estimated channel impulse response is truncated in the time domain based on channel power and noise data. Channel response tracking techniques may also be implemented to correct for variations in channel response over the transmission time of a packet.

    摘要翻译： 为使用正交频分复用（OFDM）的无线通信系统的接收机提供信道估计技术，OFDM系统包括传统802.11a和各种扩展速率系统。 从一个或多个接收天线接收训练信号。 通过参考训练序列从接收到的训练信号计算估计的信道脉冲响应。 基于信道功率和噪声数据，估计的信道脉冲响应在时域中被截断。 还可以实现信道响应跟踪技术以校正在分组的传输时间上的信道响应的变化。

    Soft symbol decoding for MIMO communication systems with reduced search complexity
    6.
    发明授权
    Soft symbol decoding for MIMO communication systems with reduced search complexity 失效
    具有降低搜索复杂度的MIMO通信系统的软符号解码

    公开(公告)号：US07421035B1

    公开(公告)日：2008-09-02

    申请号：US11764109

    申请日：2007-06-15

    申请人： James Gardner ,  Vincent K. Jones, IV ,  D. J. Richard van Nee

    发明人： James Gardner ,  Vincent K. Jones, IV ,  D. J. Richard van Nee

    IPC分类号： H04B7/02 ,  H04L1/02

    CPC分类号： H04L1/06 ,  H04L1/005 ,  H04L1/0052 ,  H04L1/0054 ,  H04L1/0071 ,  H04L25/067 ,  H04L27/38 ,  H04L2025/0342 ,  H04L2025/03426

    摘要： Soft symbol decoder algorithms for multiple input, multiple output (MIMO) receivers reduce the search complexity by searching over fewer than all possible combinations of transmitted symbols to compute log metrics for each transmitted bit from each transmit antenna. In one algorithm, a sub-optimal set of transmitted symbols is computed and the transmitted symbols are restricted to neighboring constellation points of the sub-optimal set. In another algorithm, all constellation points are searched for every antenna except one. In yet another algorithm, constellation points are searched excluding more than one antenna. The non-searched antenna(s) can be handled by either a bit stuffing or a soft slicing technique.

    摘要翻译： 用于多输入多输出（MIMO）接收机的软符号解码器算法通过搜索少于发射符号的所有可能组合来减少搜索复杂度，以计算每个发送天线中每个发送位的对数度量。 在一种算法中，计算发送符号的次最佳集合，并将所发送的符号限于次优集合的相邻星座点。 在另一种算法中，除了一个天线之外，搜索每个天线的所有星座点。 在另一种算法中，搜索除了多于一个天线的星座点。 非搜索天线可以通过位填充或软切片技术来处理。

    Modified preamble structure for IEEE 802.11a extensions to allow for coexistence and interoperability between 802.11a devices and higher data rate, MIMO or otherwise extended devices
    7.
    发明授权
    Modified preamble structure for IEEE 802.11a extensions to allow for coexistence and interoperability between 802.11a devices and higher data rate, MIMO or otherwise extended devices 有权
    用于IEEE 802.11a扩展的修改的前导码结构，以允许802.11a设备和更高数据速率，MIMO或其他扩展设备之间的共存和互操作性

    公开(公告)号：US07916803B2

    公开(公告)日：2011-03-29

    申请号：US10820440

    申请日：2004-04-05

    申请人： James Gardner ,  Vincent K. Jones, IV ,  D. J. Richard van Nee

    发明人： James Gardner ,  Vincent K. Jones, IV ,  D. J. Richard van Nee

    IPC分类号： H04B7/02

    CPC分类号： H04L1/06 ,  H04B7/04 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0048 ,  H04L5/0066 ,  H04L5/0091 ,  H04L5/1438 ,  H04L25/0226 ,  H04L27/261 ,  H04L27/2613 ,  H04W16/14 ,  H04W24/00 ,  H04W28/22 ,  H04W84/12 ,  H04W92/18 ,  H04W99/00

    摘要： A modified preamble is used by extended devices that operate at higher rates, MIMO or other extensions relative to strict 802.11a-compliant devices. The extended devices might use multiple antenna techniques (MIMO), where multiple data streams are multiplexed spatially and/or multi-channel techniques, where an extended transmitter transmits using more than one 802.11a channel at a time. Such extensions to IEEE 802.11a can exist in extended devices. The modified preamble is usable for signaling, to legacy devices as well as extended devices, to indicate capabilities and to cause legacy devices or extended devices to defer to other devices such that the common communication channel is not subject to unnecessary interference. The modified preamble is also usable for obtaining MIMO channel estimates and/or multi-channel estimates. The modified preamble preferably includes properties that facilitate detection of conventional and/or extended modes (“mode detection”) and provides some level of coexistence with legacy IEEE 802.11a devices.

    摘要翻译： 经修改的前同步码由相对于严格的符合802.11a标准的设备的较高速率，MIMO或其他扩展操作的扩展设备使用。 扩展设备可能使用多个天线技术（MIMO），其中多个数据流在空间和/或多信道技术上复用，其中扩展发射机一次使用多于一个802.11a信道进行发射。 IEEE 802.11a的这种扩展可以存在于扩展设备中。 经修改的前导码可用于对传统设备以及扩展设备进行信令，以指示能力并使遗留设备或扩展设备推迟到其他设备，使得公共通信信道不受不必要的干扰。 经修改的前导码也可用于获得MIMO信道估计和/或多信道估计。 修改的前导码优选地包括便于检测常规和/或扩展模式（“模式检测”）并且提供与传统IEEE 802.11a设备的一些级别共存的属性。

    MIMO modulation in a wireless network with at least one degenerate node
    8.
    发明授权
    MIMO modulation in a wireless network with at least one degenerate node 失效
    具有至少一个退化节点的无线网络中的MIMO调制

    公开(公告)号：US07418050B1

    公开(公告)日：2008-08-26

    申请号：US10376347

    申请日：2003-02-26

    申请人： James Gardner ,  D. J. Richard van Nee ,  Vincent K. Jones, IV ,  Geert Arnout Awater

    发明人： James Gardner ,  D. J. Richard van Nee ,  Vincent K. Jones, IV ,  Geert Arnout Awater

    IPC分类号： H04L27/28

    CPC分类号： H04B7/0697 ,  H04L25/0206 ,  H04L25/0224

    摘要： MIMO modulation is supported in a wireless network with at least one degenerate node. A transmitter separates data into multiple streams for modulation. To transmit the modulated data, the transmitter uses a separate antenna for each data stream or coherently combines the modulated data streams prior to transmission via fewer antenna than modulated data streams. In either case, the received signal includes a contribution from each data stream. A receiver is configured for processing multiple signals sent in parallel from multiple transmit antennas; thus, the operation of the receiver is unaffected by whether the multiple data streams of the transmitter were combined in the channel after transmission or in whole or part in the transmitter prior to transmission.

    摘要翻译： 在具有至少一个退化节点的无线网络中支持MIMO调制。 发射机将数据分离成多个流进行调制。 为了发送调制数据，发射机为每个数据流使用单独的天线，或者通过比调制的数据流更少的天线在传输之前相干地组合经调制的数据流。 在任一情况下，所接收的信号包括来自每个数据流的贡献。 接收机被配置为处理从多个发射天线并行发送的多个信号; 因此，接收机的操作不受传输之前的信道中的发送器的多个数据流是否被组合，或者在发送之前是整个或部分发送器中的组合。

    Near soft-output maximum-likelihood detection for multiple-input multiple-output systems
    9.
    发明授权
    Near soft-output maximum-likelihood detection for multiple-input multiple-output systems 有权
    多输入多输出系统的近似软输出最大似然检测

    公开(公告)号：US08462867B2

    公开(公告)日：2013-06-11

    申请号：US11849025

    申请日：2007-08-31

    申请人： Albert van Zelst ,  Brian Wong ,  D. J. Richard van Nee ,  Vincent K. Jones, IV ,  Geert Arnout Awater

    发明人： Albert van Zelst ,  Brian Wong ,  D. J. Richard van Nee ,  Vincent K. Jones, IV ,  Geert Arnout Awater

    IPC分类号： H04L5/12

    CPC分类号： H04L25/0204 ,  H04L1/0048 ,  H04L1/06 ,  H04L25/0242 ,  H04L25/0246 ,  H04L25/067 ,  H04L27/2601

    摘要： Systems and methodologies are described that provide low-complexity soft-output detection for MIMO communication systems. Looping can be performed over a set of constellation points per spatial stream to obtain distance metrics for each of a series of transmitted streams, for which values for the other transmitted streams can be estimated using a MIMO channel matrix and a sub-optimal MIMO algorithm. Examples of MIMO algorithms that can be utilized include Per-Stream List Detection (PSLD), Lattice-Reduced Detection (LRD), and a Guided-M Algorithm. Performance can be further improved by pre-processing the MIMO channel matrix and/or by utilizing techniques for Enhanced Metric Usage (EMU).

    摘要翻译： 描述了为MIMO通信系统提供低复杂度软输出检测的系统和方法。 可以在每个空间流的一组星座点上执行循环，以获得一系列发射流中的每一个的距离度量，对于其可以使用MIMO信道矩阵和次优MIMO算法来估计其他发送流的值。 可以使用的MIMO算法的示例包括每流列表检测（PSLD），格子减少检测（LRD）和引导M算法。 通过预处理MIMO信道矩阵和/或通过利用用于增强度量使用（EMU）的技术，可以进一步改善性能。

    Adaptive packet detection for detecting packets in a wireless medium
    10.
    发明授权
    Adaptive packet detection for detecting packets in a wireless medium 有权
    用于检测无线介质中的分组的自适应分组检测

    公开(公告)号：US07466667B2

    公开(公告)日：2008-12-16

    申请号：US11064761

    申请日：2005-02-22

    申请人： Vincent K. Jones, IV ,  Partho Mishra ,  Geert Arnout Awater ,  D. J. Richard van Nee ,  Arnold Liu ,  Brian Leslie Wong

    发明人： Vincent K. Jones, IV ,  Partho Mishra ,  Geert Arnout Awater ,  D. J. Richard van Nee ,  Arnold Liu ,  Brian Leslie Wong

    IPC分类号： H04B7/005 ,  H04J3/16 ,  H04J3/22

    CPC分类号： H04L1/0045 ,  H04W24/00 ,  H04W28/16 ,  H04W88/02

    摘要： In a packet detector, one or more tests are performed for packet detection according to packet detection parameters associated with the one or more tests, a rate of false detection is measured, and the packet detection parameters are adjusted accordingly to reduce the rate of false detection. The rate of false detection might be determined by analyzing post-detection and processing of a signal deemed to be a signal representing a packet for a failure of decoding indicative of a false detection. Such analysis might include testing for a failed SFD search, training symbol anomalies, poor conditioning of metrics used to determine frequency offset and OFDM timing, incorrect data fields, or the like.

    摘要翻译： 在分组检测器中，根据与一个或多个测试相关联的分组检测参数，对分组检测执行一个或多个测试，测量错误检测率，并相应地调整分组检测参数以降低错误检测率 。 可以通过分析被认为是表示用于指示错误检测的解码失败的分组的信号的信号的后检测和处理来确定错误检测的速率。 这种分析可能包括测试失败的SFD搜索，训练符号异常，用于确定频率偏移和OFDM定时的度量的不良调节，不正确的数据字段等。