Performance Analysis and the Novel Optical Decoder Scheme for Optical CDMA System 


Vol. 27,  No. 7, pp. 712-722, Jul.  2002


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  Abstract

We have investigated a novel optical decoder for a fiber-optic code division multiple access(CDMA) communication systems. The conventional optical encoder and decoder have the advantage of simple structure. However the number of users in the system is limited by the auto- and cross-correlation properties generated in decoding process. In previous studies, to improve the
system performance, although they used an optical code that minimize the sidelobe and cross-correlation, could not yet find a novel methods for performance improvement in fiber-optic CDMA system. Thus, it is necessary to investigate the novel optical decode in order to improve the performance of system. In this paper, we schematize the AND gate logic element(AGLE) composed with 1×2 or 1×3 coupler and the optical thyristor and propose the novel optical decoder using K(weight) AGLE. The optical thyristor only passes the overlapped signal and clips other signals. Such a novel concept means that the optical thyristor can operate as a hard-limiter. We analyze the fiber-optic CDMA system using the novel optical decoder with simulation and is found that the novel optical decoder using the AGLE and optical thyristor excludes the sidelobe and cross-correlation intensity between any two sequences.

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  Cite this article

[IEEE Style]

T. Kang, Y. Yun, Y. Choi, "Performance Analysis and the Novel Optical Decoder Scheme for Optical CDMA System," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 712-722, 2002. DOI: .

[ACM Style]

Tae-gu Kang, Young-seol Yun, and Young-wan Choi. 2002. Performance Analysis and the Novel Optical Decoder Scheme for Optical CDMA System. The Journal of Korean Institute of Communications and Information Sciences, 27, 7, (2002), 712-722. DOI: .

[KICS Style]

Tae-gu Kang, Young-seol Yun, Young-wan Choi, "Performance Analysis and the Novel Optical Decoder Scheme for Optical CDMA System," The Journal of Korean Institute of Communications and Information Sciences, vol. 27, no. 7, pp. 712-722, 7. 2002.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880