System for carrying out spread spectrum communication through an

Details System for carrying out spread spectrum communication through an System for carrying out spread spectrum communication through an

1984-10-18

1987-02-03

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

340310A, 34082508, H04B 354

Patent

active

046413227

ABSTRACT:
A communication system for carrying out communication between a plurality of stations through an electric power line operating in a commercial power frequency band. Spread spectrum modulation of an information signal, employing a pseudorandom code sequence is used at a transmitting station. Spread spectrum demodulation is carried out in a receiving station to reproduce the information signal. The modulated signal is spread over a wide frequency band different from the commercial frequency band. Each station may comprise both of a transmitter and a receiver, and may be specified by a an assigned destination address that also is transmitted. The destination station address may be indicated either by an address signal or by an additional pseudorandom code sequence peculiar to a destination station. Alternatively, polling operation is carried out through the electric power line by a polling station to select one of the stations. Preferably, another pseudorandom code sequence is superposed on the modulated signal so as to specify a synchronization signal and different from the pseudorandom code sequences conveying the information signal and/or the destination address.

REFERENCES:
patent: 2435010 (1948-01-01), Knapp et al.
patent: 3098215 (1963-07-01), Waite
patent: 3475558 (1969-10-01), Cahn
patent: 4307380 (1981-12-01), Gander
patent: 4438519 (1984-03-01), Bose
patent: 4468792 (1984-08-01), Baker et al.
patent: 4517679 (1985-05-01), Clark et al.

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