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
    4.
    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

    IPC分类号: H04L27/00

    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。

    Near soft-output maximum-likelihood detection for multiple-input multiple-output systems
    5.
    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

    IPC分类号: H04L5/12

    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。