ARRANGEMENT FOR SYNCHRONIZING ACCESS POINTS IN WLAN USING DIRECT-SEQUENCE SPREAD SPECTRUM SIGNALING
摘要
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.
申请公布号
WO2007133424(A3)
申请公布日期
2008.04.03
申请号
WO2007US10243
申请日期
2007.04.26
申请人
AT & T CORP.;GHASSEMZADEH, SAEED, S.;MILLER, ROBERT, RAYMOND, II;MURRAY, JOHN, F.
发明人
GHASSEMZADEH, SAEED, S.;MILLER, ROBERT, RAYMOND, II;MURRAY, JOHN, F.