Method of synchronization of transmitter-receiver stations of a

Details Method of synchronization of transmitter-receiver stations of a Method of synchronization of transmitter-receiver stations of a

1982-12-13

1986-03-25

Cangialosi, Salvatore

Telecommunications

Carrier wave repeater or relay system

Frequency or phase modulation

178 2217, 375 22, H04K 100

Patent

active

045788162

ABSTRACT:
The method of synchronization enables a network of transmitter-receiver stations which communicate by frequency-jumping to establish communication links after silent periods of long duration in spite of drift of the clocks with which the transmitter-recivers of the network are equipped. Standby laws L.sub.i having frequency jumps deduced from the traffic law L are applied during the silent periods of the network. These laws progress at a frequency which is lower as the silent period of the network becomes longer. A calling station breaks the silence of the network by transmitting a call sequence . . . ST, ST, ST, ST, ST, . . . , under frequency conditions which are determined from its standby law L.sub.i in progress and from the preceding standby law L.sub.i-1. The stations in the standby state detect in this sequence part of the sequence which coincides with their own standby law and accordingly deduce their relative displacement with respect to the calling station.

REFERENCES:
patent: 4145569 (1979-03-01), Ehrat
patent: 4276652 (1981-06-01), McCalmont et al.
patent: 4301537 (1981-11-01), Roos
patent: 4355399 (1982-10-01), Timor
patent: 4383323 (1983-05-01), Timor II
patent: 4392231 (1983-07-01), Henry
patent: 4479226 (1984-10-01), Prabhu et al.
IEEE National Telecommunications Conference, Dec. 1974, Merkel et al., "Microcomputer Application To a Spread Spectrum Frequency Hopping Modem", pp. 536-542.

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