Telecommunication system and a main station for use in such a system
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United States of America Patent
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Apr 8, 1997
Grant Date -
N/A
app pub date -
Mar 14, 1994
filing date -
Mar 15, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Telecommunication systems such as PON-FITL-Systems are known having a TDMA frame structure and comprising a main station and a number of substations. The known systems can comprise apparatus for coarse ranging and for fine ranging. A Pseudo Noise Sequence based coarse ranging technique employs coarse ranging at a fixed position within the upstream multiframe reserved for ranging, preferably for fine ranging. By applying a low power Pseudo Noise Sequence for coarse ranging and sampling the range in the main station only within a fine ranging window the position of which is known to the main station, a more accurate coarse ranging is achieved. Within the fine ranging window normally no data are present, and thus the signal-to-interference ratio is an order of magnitude better than in the other part of the frame.
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