Telecommunication network for transmitting information to a plur

Details Telecommunication network for transmitting information to a plur Telecommunication network for transmitting information to a plur

1995-05-30

1997-03-18

Eisenzopf, Reinhard J.

Telecommunications

Transmitter and receiver at separate stations

Frequency or phase modulation

370343, 359125, H04B 150, H04B 1024

Patent

active

056132107

ABSTRACT:
In a multiple access network a main station is to be capable of distinguishing signals transmitted by sub-stations to the main station. A method of realising this is the use of SCMA (SubCarder Multiple Access). According to this method the signal to be transmitted is modulated on a subcarrier having its own frequency and then modulated on a main carrier in each sub-station. In prior-art multiple access network the distribution signals which are to be transmitted to the sub-stations by the main station are modulated each on its own distribution subcarrier and then applied to a shared distribution modulator. For diminishing the requirements posed on the high-frequency properties of the electronic components necessary for the network, the subcarriers for distribution signals and return signals are selected to lie in the same frequency band.

REFERENCES:
patent: 4789980 (1988-12-01), Darcie et al.
patent: 4914648 (1990-04-01), Acampora et al.
patent: 5301053 (1994-04-01), Shikada
"Optical Interference in Subcarrier Multiplexed Systems with Multiple Optical Carriers" C. Desem, IEEE Journal on Selected Areas in Communication, vol. 8, No. 7, Sep. 1990, pp. 1290-1295.
"Wide Band Lightwave Distribution System Using Subcarrier Multiplexing" T.E. Darcy et al, IEEE Journal of Lightwave Technology, vol. 7, No. 6, Jun. 1989, pp. 997-1005.

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