Timing phase synchronization detecting circuit and demodulator
    15.
    发明公开
    Timing phase synchronization detecting circuit and demodulator 有权
    用于相位同步和解调器检测电路

    公开(公告)号:EP0913963A3

    公开(公告)日:2003-01-08

    申请号:EP98120086.8

    申请日:1998-10-23

    IPC分类号: H04L7/033 H03L7/095

    摘要: A demodulator is made compact, and with a simple circuit arrangement, and also having a better bit error rate characteristic. A timing phase synchronization detecting circuit 219 judges any one of the following two conditions based upon baseband phase data 202, i.e., an UNLOCK (timing phase asynchronous) condition, and a LOCK (timing phase synchronous) condition. Based upon the judgement result of the timing phase synchronization detecting circuit 219, in a timing recovering means 221, a frequency range of a PLL (phase synchronization loop) is variable, whereas the number of data entered within 1 symbol time is variable in a frequency synchronizing means 222 and a carrier recovering means 223. A data demodulating means 224 outputs demodulation data 206 in response to baseband phase data 202 and a recovery carrier signal 205.

    Upstream synchronisation in a multi-point to point communications system
    19.
    发明公开
    Upstream synchronisation in a multi-point to point communications system 失效
    einem mehrpunkt-zu-punkt Vermittlungssystem的Synchronisierung desAufwärtskanals

    公开(公告)号:EP1229683A2

    公开(公告)日:2002-08-07

    申请号:EP02076653.1

    申请日:1996-02-06

    IPC分类号: H04L5/02 H04L5/14

    摘要: The communication system includes a hybrid fiber/coax distribution network. A head end provides for downstream transmission of telephony and control data in a first frequency bandwidth over the hybrid fiber/coax distribution network and reception of upstream telephony and control data in a second frequency bandwidth over the hybrid fiber/coax distribution network. The head end includes a head end multicarrier modem for modulating at least downstream telephony information on a plurality of orthogonal carriers in the first frequency bandwidth and demodulating at least upstream telephony information modulated on a plurality of orthogonal carriers in the second frequency bandwidth. The head end further includes a controller operatively connected to the head end multicarrier modem for controlling transmission of the downstream telephony information and downstream control data and for controlling receipt of the upstream control data and upstream telephony information. The system further includes service units, each service unit operatively connected to the hybrid fiber/coax distribution network for upstream transmission of telephony and control data in the second frequency bandwidth and for receipt of the downstream control data and telephony in the first frequency bandwidth. Each service unit includes a service unit multicarrier modem for modulating at least the upstream telephony information on at least one carrier orthogonal at the head end terminal to another carrier in the second frequency bandwidth and for demodulating at least downstream telephony information modulated on at least a band of a plurality of orthogonal carriers in the first frequency bandwidth. Each service unit also includes a controller operatively connected to the service unit multicarrier modem for controlling the modulation of and demodulation performed by the service unit multicarrier modem. A method of monitoring communication channels, a distributed loop method for adjusting transmission characteristics to allow for transmission of data in a multi-point to point communication system, a polyphase filter technique for providing ingress protection and a scanning method for identifying frequency bands to be used for transmission by service units are also included.

    摘要翻译: 通信系统包括混合光纤/同轴电缆分配网络。 前端提供在混合光纤/同轴电缆分配网络上的第一频带中的电话和控制数据的下行传输以及在混合光纤/同轴电缆分配网络上以第二频带宽度接收上行电话和控制数据。 头端包括头端多载波调制解调器,用于在第一频带中对多个正交载波调制至少下游电话信息,并且解调至少在第二频带中的多个正交载波上调制的上行电话信息。 前端还包括可操作地连接到头端多载波调制解调器的控制器,用于控制下游电话信息和下游控制数据的传输,并用于控制上游控制数据和上游电话信息的接收。 该系统还包括服务单元,每个服务单元可操作地连接到混合光纤/同轴电缆分配网络,用于电话的上行传输和第二频率带宽中的控制数据,以及用于在第一频带中接收下游控制数据和电话。 每个服务单元包括服务单元多载波调制解调器,用于至少将在头端终端正交的至少一个载波调制到第二频带中的另一个载波上的上行电话信息,并用于解调至少在至少一个频带上调制的下游电话信息 的第一频带中的多个正交载波。 每个服务单元还包括可操作地连接到服务单元多载波调制解调器的控制器,用于控制由服务单元多载波调制解调器执行的调制和解调。 监视通信信道的方法,用于调整传输特性以允许多点到点通信系统中的数据传输的分布式环路方法,用于提供入口保护的多相滤波器技术和用于识别要使用的频带的扫描方法 也包括服务单位的传输。

    ULTRA WIDE BAND BASE BAND RECEIVER
    20.
    发明公开
    ULTRA WIDE BAND BASE BAND RECEIVER 审中-公开
    超宽带基带接收器

    公开(公告)号:EP1226652A1

    公开(公告)日:2002-07-31

    申请号:EP00968486.1

    申请日:2000-09-28

    IPC分类号: H03K9/04 H04L27/233 H04L7/00

    摘要: The present invention is a receiver (18) having a radio frequency front end (24), a pulse detector (26) operatively coupled to the Rf front end (24), and a data recovery unit (104) operatively coupled to the pulse detector (26). The data recovery unit (104) is configured to receive spread spectrum Rf signals having different pulse repetition frequencies and using different modulation techniques. The receiver (18) may also operate in a network environment in which a network of transceiver node device (12) comprise a first slave transceiver having a receiver configured to receive spread spectrum signals, and a second slave transceiver configured to communicate with the first slave transceiver. Additionally, a master transceiver is in communication with the first slave transceiver and the second slave transceiver. The master transceiver is configured to manage data transmission and synchronization between the first slave transceiver and the second slave transceiver.