Telecommunication system and a main station and a substation for

Details Telecommunication system and a main station and a substation for Telecommunication system and a main station and a substation for

1994-03-14

1996-11-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

3701001, 370108, 375368, H04J 300

Patent

active

055793215

ABSTRACT:
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.

REFERENCES:
patent: 5124985 (1992-06-01), Hashikawa
patent: 5319634 (1994-06-01), Barholomew et al.
The European Search report, N. V. Philips'Gloeilampen Fabrieken, Sep. 1994, pp. 1-2.

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