公开(公告)号：US5579321A

公开(公告)日：1996-11-26

申请号：US213485

申请日：1994-03-14

申请人： Petrus, A. M. Van Grinsven ,  Wilfred A. M. Snijders

发明人： Petrus, A. M. Van Grinsven ,  Wilfred A. M. Snijders

IPC分类号： H04B10/272 ,  H04J3/06 ,  H04L7/033 ,  H04L7/04 ,  H04J3/00

CPC分类号： H04J3/0682 ,  H04B10/272 ,  H04L7/0337 ,  H04L7/042 ,  H04L7/044

摘要： Telecommunication systems such as PON-FITL-Systems have a TDMA frame structure comprising a main station and a number of substations. In order to achieve accurate fine ranging, an A/D-converter for acquiring samples from a ranging pulse transmitted from the substation is operated at a frequency which is high with respect to the master or bit clock, i.e. real time oversampling occurs. Such high speed A/D-converters are expensive, consume much power and have limited resolution. Furthermore, for systems with even higher bit rates the known oversampling becomes cumbersome. A quasi-oversampled coarse and/or fine ranging is proposed operating at relatively low sampling rates. Thus the substations send a repetitive ranging-bit-pattern which is sampled in the main station and thereafter reconstructed in a processing apparatus to a quasi-oversampled ranging-bit-pattern. In order to find the ranging error to be sent to the relevant substation, the quasi-oversampled ranging-bit-pattern is matched against a reference pattern, and the ranging error is found from the best match.

摘要翻译： 诸如PON-FITL-Systems的电信系统具有包括主站和多个变电站的TDMA帧结构。 为了实现精确的精细测距，用于从从变电站发送的测距脉冲中采集采样的A / D转换器以相对于主站或位时钟为高的频率工作，即发生实时过采样。 这种高速A / D转换器是昂贵的，消耗大量功率并且分辨率有限。 此外，对于具有更高比特率的系统，已知的过采样变得麻烦。 提出了一种准过采样的粗和/或精细测距，以较低的采样率运行。 因此，变电站发送重复的测距位模式，其在主站中被采样，然后在处理设备中被重构为准过采样的测距位模式。 为了找到要发送到相关变电站的测距误差，将准过采样测距位模式与参考模式进行匹配，并从最佳匹配中找到测距误差。