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    • 5. 发明授权
    • CELLULAR COMMUNICATIONS NETWORK
    • 蜂窝通信网络
    • EP0769236B1
    • 2004-09-08
    • EP95919930.8
    • 1995-05-29
    • CURTIN UNIVERSITY OF TECHNOLOGY
    • CHUNG, Kah-SengSEALE, Richard, BeaumontBARKER, David, Antony
    • H04Q7/22H04B7/26
    • H04W88/085H04B7/2609
    • A communication network for an area such as an underground mine. A plurality of cascaded base stations (13) are serially interconnected in a ring structure (11) to form a network backbone. One of the base stations (13) at one end of the network backbone forms a network controller (15) for controlling the network. A plurality of portables (17) are adapted for communication with any of the base stations via a common air interface. A backbone network protocol (19) is provided for communicating between the network controller (15) and all of the base stations (13) and between the base stations (13) along the network backbone themselves. A common air interface protocol (21) is provided for communicating between a portable (17) and a base station (13). The other base stations (13) function as slaves relative to the network controller (15). Each slave base station (13) defines a discrete cell within which communication between a portable (17) disposed within a cell and the base station (13) generating the cell is able to be performed over the common air interface. A method of communicating using a startup procedure which assigns different operating carrier frequencies to each of the base stations for the common air interfaces of the cells therefor is also described.
    • 6. 发明公开
    • METHOD AND APPARATUS FOR TRANSFER OF REAL TIME SIGNALS OVER PACKET NETWORKS
    • VERFAHREN UND VORRICHTUNG ZURÜBERTRAGUNGVON ECHTZEITSIGNALENÜBERPAKETNETZE
    • EP1088429A1
    • 2001-04-04
    • EP99923316.6
    • 1999-05-19
    • CURTIN UNIVERSITY OF TECHNOLOGY
    • BUDRIKIS, Zigmantas, L.MERCANKOSK, GuvenSILIQUINI, John
    • H04L12/56H04L29/08
    • H04L47/28H04L12/6418H04L29/06027H04L47/2416H04L47/50H04L47/564H04L65/607
    • The present invention allows routers in a digital communications network, such as the Internet, to be given the time awareness that is necessary for timely transfer of real time signals in the form of digital data packets. Timing information generated at the source of the signal is included in the packets in the form of first and second time stamps, which are used by network routers to establish dispatch deadlines by which the packets must be forwarded to ensure time-faithful reconstruction of the real time signal at the destination. The same timing information can be used at the destination to synchronise the clock for presentation of the real time signal to the source clock. The first and second time stamps (a differential time and a dispatch time) are derived by a transmitter unit (100) from a counter (118) that counts pulses from an oscillator (116) that most advantageously is locked to an integer multiple or a fraction of a universally available time measure. Assuming that the same time measure, or at least a very near replica, is available at routers in the network and at destinations connected to the network, the time stamps marked in the packets can be used by routers to effect scheduling for timely dispatch of the packets.
    • 本发明允许诸如因特网的数字通信网络中的路由器被给予以数字数据分组的形式及时传送实时信号所必需的时间意识。 在信号源产生的定时信息以第一和第二时间戳的形式包含在分组中,由网络路由器用于建立分发截止时间,通过该时间段,分组必须被转发以确保实时的真实重建 目的地的时间信号。 可以在目的地使用相同的定时信息来同步时钟,以将实时信号呈现给源时钟。 第一和第二时间戳(差分时间和调度时间)由来自计数器(118)的发射机单元(100)导出,计数器(118)对来自最有利地锁定到整数倍的振荡器(116)的脉冲进行计数 普遍可用的时间测量的分数。 假设在网络中的路由器和连接到网络的目的地的相同时间测量或至少非常接近的副本可用,路由器可以使用报文中标记的时间戳来实现调度,以及时发送 数据包。
    • 8. 发明公开
    • STEERED FREQUENCY PHASE LOCKED LOOP
    • 与导频锁相环
    • EP0795234A1
    • 1997-09-17
    • EP95936900.0
    • 1995-11-28
    • CURTIN UNIVERSITY OF TECHNOLOGY
    • HILL, Martin Australian Telecom Research Institute
    • H03L7H04L7
    • H03L7/14H03L7/087H04L7/033
    • A Steered Frequency Phase Lock Loop (SFPLL) comprises a phase loop that functions like a normal phase locked loop (PLL) and locks to the input signal, and a frequency loop that uses a reference frequency to influence the phase loop and effectively confines the output frequency of the phase loop and the SFPLL to be in a range of frequencies close to the reference frequency. The reference frequency is chosen to be very close to the input signal frequency that it is desired the SFPLL lock to. The SFPLL comprises a phase detector (10), a frequency detector (22), first and second gain components (12, 24), first, second and third filter components (14, 18, 26), a summer (16) and a voltage controlled oscillator (VCO) (20). By a judicious choice of the gains in the phase and frequency loops the SFPLL can be designed so that the range of frequencies to which the SFPLL will lock can be confined to an arbitrarily small region around the reference frequency (φ'r). Applications of the SFPLL include demodulation in CW modulation systems and timing recovery from NRZ data. Three advantages of the SFPLL are that the output frequency is equal or close to the reference frequency when no input signal is present, and the range of frequencies to which the SFPLL can lock is confined to a region around the reference frequency, and the phase and frequency instabilities of the VCO can be reduced.