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    • 1. 发明授权
    • Arrangement for synchronizing access points in WLAN using direct-sequence spread spectrum signaling
    • 使用直接序列扩频信令在WLAN中同步接入点的布置
    • US08571072B2
    • 2013-10-29
    • US12636866
    • 2009-12-14
    • Saeed S. GhassemzadehRobert Raymond Miller, IIJohn F. Murray
    • Saeed S. GhassemzadehRobert Raymond Miller, IIJohn F. Murray
    • H04J3/06
    • H04W56/001H04B1/7073H04B1/7075H04J3/0602H04J3/0611H04J3/0658H04L7/0008H04W84/12H04W88/08
    • An arrangement for providing synchronization between a number of overlapping area access points within a wireless LAN utilizes a Power over Ethernet (PoE) cable connection to transmit synchronization signals from a centralized hub/switch to each of the access points connected to the cable. The synchronization signal takes the form of a direct sequence spread spectrum (DS-SS) signal that is coupled onto the twisted pair used to provide the low voltage PoE signal to various powered devices. At each access point, a filter is used to remove the synchronization signal from the PoE transport, allowing for the group of access points to share a common beacon signal and allow for frequency re-use among the access points. The DS-SS signal is preferable created by a combination of a baseband signal and a set of separate pseudo noise (PN) sequences defining a precision phase (“pilot tone”) signal, a time mark (superframe/beacon) signal, and a time-of-day (real-time clock) signal.
    • 用于在无线LAN内的多个重叠区域接入点之间提供同步的装置利用以太网供电(PoE)电缆连接来将集中式集线器/交换机的同步信号传送到连接到电缆的每个接入点。 同步信号采用直接序列扩频(DS-SS)信号的形式,其被耦合到双绞线上,用于向各种供电设备提供低电压PoE信号。 在每个接入点,使用滤波器从PoE传输中去除同步信号,允许接入点组共享公共信标信号,并允许接入点之间的频率重新使用。 DS-SS信号优选地由基带信号和定义精密相位(“导频”)信号,时间标记(超帧/信标)信号和时间标记(超帧/信标))信号的单独伪噪声(PN)序列的组合组成 时间(实时时钟)信号。
    • 2. 发明授权
    • Arrangement for synchronizing access points in WLAN using direct-sequence spread spectrum signaling
    • 使用直接序列扩频信令在WLAN中同步接入点的布置
    • US07656855B2
    • 2010-02-02
    • US11505553
    • 2006-08-16
    • Saeed S. GhassemzadehRobert Raymond Miller, IIJohn F. Murray
    • Saeed S. GhassemzadehRobert Raymond Miller, IIJohn F. Murray
    • H04J3/06
    • H04W56/001H04B1/7073H04B1/7075H04J3/0602H04J3/0611H04J3/0658H04L7/0008H04W84/12H04W88/08
    • An arrangement for providing synchronization between a number of overlapping area access points within a wireless LAN utilizes a Power over Ethernet (PoE) cable connection to transmit synchronization signals from a centralized hub/switch to each of the access points connected to the cable. The synchronization signal takes the form of a direct sequence spread spectrum (DS-SS) signal that is coupled onto the twisted pair used to provide the low voltage PoE signal to various powered devices. At each access point, a filter is used to remove the synchronization signal from the PoE transport, allowing for the group of access points to share a common beacon signal and allow for frequency re-use among the access points. The DS-SS signal is preferable created by a combination of a baseband signal and a set of separate pseudo noise (PN) sequences defining a precision phase (“pilot tone”) signal, a time mark (superframe/beacon) signal, and a time-of-day (real-time clock) signal.
    • 用于在无线LAN内的多个重叠区域接入点之间提供同步的装置利用以太网供电(PoE)电缆连接来将集中式集线器/交换机的同步信号传送到连接到电缆的每个接入点。 同步信号采用直接序列扩频(DS-SS)信号的形式,其被耦合到双绞线上,用于向各种供电设备提供低电压PoE信号。 在每个接入点,使用滤波器从PoE传输中去除同步信号,允许接入点组共享公共信标信号,并允许接入点之间的频率重新使用。 DS-SS信号优选地由基带信号和定义精密相位(“导频”)信号,时间标记(超帧/信标)信号和时间标记(超帧/信标))信号的单独伪噪声(PN)序列的组合组成 时间(实时时钟)信号。
    • 3. 发明申请
    • Arrangement for synchronizing access points in WLAN using direct-sequence spread spectrum signaling
    • 使用直接序列扩频信令在WLAN中同步接入点的布置
    • US20070253382A1
    • 2007-11-01
    • US11505553
    • 2006-08-16
    • Saeed S. GhassemzadehRobert Raymond MillerJohn F. Murray
    • Saeed S. GhassemzadehRobert Raymond MillerJohn F. Murray
    • H04Q7/24
    • H04W56/001H04B1/7073H04B1/7075H04J3/0602H04J3/0611H04J3/0658H04L7/0008H04W84/12H04W88/08
    • An arrangement for providing synchronization between a number of overlapping area access points within a wireless LAN utilizes a Power over Ethernet (PoE) cable connection to transmit synchronization signals from a centralized hub/switch to each of the access points connected to the cable. The synchronization signal takes the form of a direct sequence spread spectrum (DS-SS) signal that is coupled onto the twisted pair used to provide the low voltage PoE signal to various powered devices. At each access point, a filter is used to remove the synchronization signal from the PoE transport, allowing for the group of access points to share a common beacon signal and allow for frequency re-use among the access points. The DS-SS signal is preferable created by a combination of a baseband signal and a set of separate pseudo noise (PN) sequences defining a precision phase (“pilot tone”) signal, a time mark (superframe/beacon) signal, and a time-of-day (real-time clock) signal.
    • 用于在无线LAN内的多个重叠区域接入点之间提供同步的装置利用以太网供电(PoE)电缆连接来将集中式集线器/交换机的同步信号传送到连接到电缆的每个接入点。 同步信号采用直接序列扩频(DS-SS)信号的形式,其被耦合到双绞线上,用于向各种供电设备提供低电压PoE信号。 在每个接入点,使用滤波器从PoE传输中去除同步信号,允许接入点组共享公共信标信号,并允许接入点之间的频率重新使用。 DS-SS信号优选地由基带信号和定义精密相位(“导频”)信号,时间标记(超帧/信标)信号和时间标记(超帧/信标))信号的单独伪噪声(PN)序列的组合组成 时间(实时时钟)信号。