Telecommunication system and a main station for use in such a sy

Details Telecommunication system and a main station for use in such a sy Telecommunication system and a main station for use in such a sy

1994-03-14

1997-04-08

Olms, Douglas W.

Multiplex communications

Communication over free space

Combining or distributing information via time channels

370442, H04J 310

Patent

active

056195044

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.

REFERENCES:
patent: 5321690 (1994-06-01), Sata
patent: 5331316 (1994-07-01), Mestdagh et al.
"Burst and Bit Synchronization Methods for Passive Optical Networks" C.A. Eldering et al, 4th Workshop on Optical Local Networks, IEEE, Sep. 24, 25, 1992 pp. 38-44.
"Survey of Synchronization Techniques for a TDMA Satellite-Switched System" IEEE Transactions on Communications, vol. COM-28, No. 8, Aug. 1980.

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