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Performance Analysis of Optical Hard-Limiter for The Beat Noise in 2-Dimensional OCDMA Receivers  

김정중 (충북대학교 전기전자공학부 전파공학과 통신신호처리연구실)
이인성 (충북대학교 전기전자컴퓨터공학부, 컴퓨터 정보통신연구소)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.4C, 2004 , pp. 485-493 More about this Journal
Abstract
The system performance of 2-Dimensional wavelength hopping/time spreading optical CDMA systems is found to be limited by the occurrence of the beat noise between the components of the signal and the multiple user interference. This paper shows that the performance is analyzed under the beat noise and no beat noise to blow impact of the beat noise. To overcome this problem, the OHL(Optical Hard-Limiter) is used in the receiver. The performance is calculated for a optical CDMA system employing asymmetric and symmetric prime-hop 2-Dimensional codes, respectively The analysis results show that the performance improved 3.5 times of simultaneous users of before and after inserting OHL in the case of no beat noise. In the case of beat noise the performance improved 1.5 times of simultaneous users of before and after inserting OHL. The performance marked use of symmetric prime-hop code.
Keywords
OCDMA; prime-hop code; multi-channel interference; Optical hard-limiter; beat noise;
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