公开(公告)号：US06798790B1

公开(公告)日：2004-09-28

申请号：US09588174

申请日：2000-06-07

申请人： Jürgen Enssle ,  Hardy Halbauer ,  Jürgen Otterbach

发明人： Jürgen Enssle ,  Hardy Halbauer ,  Jürgen Otterbach

IPC分类号： H04L700

CPC分类号： H04N21/242 ,  H04J3/0682 ,  H04N7/17309 ,  H04N21/6168

摘要： A master clock signal generated at the center (1) of a bidirectional point-to-multipoint network is transmitted in the form of time stamps in an MPEG-2 data format over the downstream channel of the network to a plurality of transmitting/receiving facilities (3). Each transmitting/receiving facility (3) derives the clock signal for the upstream channel from the master clock signal and a local clock signal generated by a reference clock (12). The center (1) compares the clock signal from each transmitting/receiving facility with the master clock signal and derives from the result of this comparison digital phase correction information individual to each transmitting/receiving facility (3), which it transmits to the respective transmitting/receiving facility (3) in the MPEG-2 data stream. The respective transmitting/receiving facility (3) uses the phase correction information to control the clock signal for the upstream channel in a numerically controlled oscillator (13).

摘要翻译： 在双向点对多点网络的中心（1）处生成的主时钟信号以网络的下游信道上的MPEG-2数据格式的时间戳的形式发送到多个发送/接收设备 （3）。 每个发送/接收设施（3）从主时钟信号和由参考时钟（12）产生的本地时钟信号导出上行信道的时钟信号。 中心（1）将来自每个发送/接收设施的时钟信号与主时钟信号进行比较，并将该比较数字相位校正信息的结果从每个发送/接收设施（3）导出，并发送给各个发送/接收设备 / 3接收设备（3）。 相应的发送/接收设施（3）使用相位校正信息来控制数控振荡器（13）中的上行信道的时钟信号。

公开(公告)号：US07016335B1

公开(公告)日：2006-03-21

申请号：US09587909

申请日：2000-06-06

申请人： Jürgen Enssle ,  Marc Pelous

发明人： Jürgen Enssle ,  Marc Pelous

IPC分类号： H04B7/216

CPC分类号： H04J13/10 ,  H04J13/004

摘要： The object of the invention is to provide an acquisition method for a multipoint-to-point CDMA network (NET) that minimizes the influence of the acquisition procedure on the information transmission. The acquisition signals are encoded in a specific acquisition code that differs from the CDMA communication code of the information signals. In addition, the acquisition signals are transmitted with an amplitude smaller than that of the information signals. At the receiving end, the acquisition signals are detected by correlation (11) and subsequent accumulation (12). This method maximizes the transmission capacity of the information signals. In addition, the acquisition time is reduced since adaptive contention-resolving techniques can be employed taking account of the estimated number of colliding terminals (2, 3, 4, 5).

摘要翻译： 本发明的目的是提供一种用于使获取过程对信息传输的影响最小化的多点到点CDMA网络（NET）的获取方法。 采集信号以与信息信号的CDMA通信码不同的特定采集码进行编码。 此外，以比信息信号的幅度小的幅度发送采集信号。 在接收端，通过相关（11）和随后的累加（12）检测采集信号。 该方法使信息信号的传输容量最大化。 此外，由于可以考虑估计的碰撞终端数量（2,3,4,5），可以采用自适应争用解决技术，所以采集时间减少。