Multiple access telecommunication network

Details Multiple access telecommunication network Multiple access telecommunication network

1995-10-10

1997-01-28

Chin, Wellington

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359137, 359184, 379 56, 455 89, H04J 1402, H04B 1004

Patent

active

055982875

ABSTRACT:
In a multiple access network the signals transmitted by a plurality of sub-stations to a main station over a common channel must be distinguished for each sub-station. A method of achieving this is to employ SCMA (Subcarrier Multiple Access), according to which in each sub-station the transmit signal is modulated on a subcarrier having a different frequency for each substation, and the modulated subcarrier amplitude modulates a main carrier which has substantially the same frequency for all sub-stations. To minimize mutual interference between sub-stations, according to the invention the amplitude of the main carrier transmitted by a sub-station is reduced during intervals in which the modulated auxiliary signal from that sub-station is not present or is at a zero reference level. In this way the number of modulated carrier signals which are present at any given time is reduced. Mutual interference is thereby significantly reduced, because it depends on the squared number of carriers present in the system.

REFERENCES:
Sierens et al., "Subcarrier Multiple Access for Passive Optical Networks and Comparison to Other Multiple Access Techniques", GLOBECOM '91 (IEEE Global Telecommunications Conference, Conference Record, vol. 1, pp. 619-623. 2-5 Dec. 1991.
"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.
"256-QAM Subcarrier Transmission for Broadband Distribution Networks", by H. Ohtsuka et al, IEEE, 1991, pp. 1817-1822.

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