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1. (WO2018166694) SYNCHRONISATION IN A COMMUNICATIONS NETWORK

Pub. No.:    WO/2018/166694    International Application No.:    PCT/EP2018/052275
Publication Date: Fri Sep 21 01:59:59 CEST 2018 International Filing Date: Wed Jan 31 00:59:59 CET 2018
IPC: H04B 1/7073
H04B 1/707
H04J 13/10
H04J 13/16
H04W 84/18
Applicants: BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY
Inventors: GHARIB, Hamid
ZOUALFAGHARI, Mohammad
Title: SYNCHRONISATION IN A COMMUNICATIONS NETWORK
Abstract:
A spread spectrum system is used for transmitting data to and from devices operable as sensors and actuators in a distributed system. Each device is allocated a respective spread spectrum code, or combination of such codes in a branched network, for decoding and decoding the data (52, 58) and has a corresponding encoder/decoder in a central control system operating the same spread spectrum codes, the encoded data relating to the individual devices all being aggregated over a shared channel. To reduce the decoding overhead, the coding and encoding processes are synchronised using a pulse train of a master clock transmitted by a broadcasting antenna(400) and the devices and control centre receive, decode and operate according to time based on the pulse train. An offset may be calculated (83) to allow for distance from the transmitter, based on received power (81), GPS, or other data.