The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지

A Study on Detectors and Interference Models for 2-D OCDMA Networks

2-D OCDMA LAN에서의 검출기와 간섭 모델의 성능에 대한 비교 연구

  • Published : 2003.04.01
Download PDF
⟨ Previous Next ⟩

Abstract

2-D OCDMA is considered to be a viable technical solution for optical LANs, and a considerable amount of research effort has been devoted to various 2-D OCDMA techniques. In this paper, we propose two new interference model for 2-D OCDMA LANs employing unipolar random codes, and derive maximum-likelihood detectors based on these interference models. The BER performance of the maximum likelihood detectors and that of other existing detectors are compared through extensive computer simulation. In addition, the complexity of high-speed implementation of the detectors is assessed, and as a result, we found that the AND detector and the maximum-likelihood detectors for the pulse-binomial and the pulse-Poisson model offer the best trade-off between the BER performance and the facility of high-speed implementation.

2-D OCDMA는 근거리 광통신망의 구현을 위한 유력한 기술적 해법으로 고려되고 있으며, 다양한 2-D OCMA 기법/기술에 대한 많은 연구가 이루어지고 있다. 본 논문에서는 단극부호를 사용하는 2D OCDA 통신망의 성능분석을 위한 새로운 다중접속 간섭모델을 제안하고 이 간섭모델을 기초로 하는 최대공산검출기를 유도한다. 또한, 이들 최대공산검출기와 기존에 제안된 보다 단순한 구조를 갖는 검출기의 검출성능을 컴퓨터 모의실험을 통해 비교한다. 상대적으로 복잡한 연산이 어려운 순수 광통신망에서의 적용을 고려하여 각 검출기의 구현복잡도를 평가하고, 그 결과 Pulse-Binomial 모델과 Pulse-Poisson 모델로부터 유도된 최대공산 검출기와 AND 검출기가 검출성능과 구현용이성측면에서 최적균형점에 있음을 확인한다.

Keywords

References

  1. A. Stok, E.H. Sargent, 'Lighting the local area: optical code-division multiple access and quality of service provisioning.' IEEE Network 14, pp. 42-46, 2000
  2. F.T.W. Chang, E.H. Sargent, 'Optical CDMA using 2-D codes: the optimal single user detector,' IEEE Communications Letters 5, pp. 169-171, 2001 https://doi.org/10.1109/4234.917103
  3. E.S. Shivaleela, K.N. Sivarajan, A. Selvarajan, 'Design of a new family of two-dimesional codes for fiber-optic CDMA networks,' Journal of Lightwave Technology 16, pp. 501-508, 1998 https://doi.org/10.1109/50.664055
  4. L. Tancevski, I. Andonovic. M. Tur. J. Budin. 'Hybrid wavelength hopping/time spreading code division multiple access system,' Proceeding of IEE Optoelectronics 143, pp. 161-166, 1996 https://doi.org/10.1049/ip-opt:19960318
  5. G.C. Yang, W.C. Kwong, 'Two-dimensional spatial signature patterns,' IEEE Transactions on Communications 44, pp. 184-191, 1996 https://doi.org/10.1109/26.486611
  6. G.C. Yang, W.C. Kwong, 'Performance comparison of multiwavelength CDMA and WDMA+CDMA for fiber-optic networks,' IEEE Transactions on Communications 45, pp. 1426-1434, 1997 https://doi.org/10.1109/26.649764
  7. L.R. Chen. 'Flexible fiber Bragg grating encoder/decoder for hybrid wavelength-time optical CDMA,' IEEE Photonics Technology Letters 13, pp. 1233-1235. 2001 https://doi.org/10.1109/68.959374
  8. S. Yegnanarayanan, A.S. Bhushan B. Jalali, ' Fast wavelength-hopping time-spreading encoding/decoding for optical CDMA,' IEEE Photonics Technology Letters 12, pp. 573-575, 2000 https://doi.org/10.1109/68.841290
  9. H. Yu, L. Breslau, S. Shenker, 'A scalable web cache consistency architecture,' in Proceedings of ACM SIGCOMM '99 Comp. Commun.. pp. 163-174, 1999
  10. J.A. Salehi, 'Emerging optical code-division multiple access communications systems.' IEEE Networks 3, pp. 31-39. 1989
  11. J.A. Salehi. 'Code division multiple aceess techniques in optical fiber networks Part I: Fundamental principles,' IEEE Transaction on Communications 37, pp. 824-833, 1989 https://doi.org/10.1109/26.31181