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

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Shared-type Encoder/Decoder Based on 2-D Optical Codes for Large Capacity Optical CDMA Network

대용량 광 부호 분할 다중접속(Optical CDMA) 네트워크를 위한 2차원 코드의 공유형 부호기/복호기

  • 고원석 (대우컴퓨터 제품연구실) ;
  • 신서용 (명지대학교 통신공학과 광통신연구실) ;
  • 황유모 (명지대학교 무선통신연구실) ;
  • 장철호 (대조건설(주) CEO실)
  • Published : 2005.05.01
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Abstract

For large capacity optical CDMA networks, we propose a shared-type encoder/decoders based on an tunable wavelength converter(TWC) and an arrayed waveguide grating (AWG) router. The proposed encoder/decoder treats codewords of wavelength/time 2-D code simultaneously using the dynamic code allocation property of the TWC and the cyclic property of the AWG router, and multiple subscribers can share the encoder/decoder in networks. Feasibility of the structure of the proposed encoder/decoder for dynamic code allocation is tested through simulations using two wavelength/time 2-D codes, which are the generalized multi-wavelength prime code(GMWPC) and the generalized multi-wavelength Reed-Solomon code(GMWRSC). Test results show that the proposed encoder/decoder can increase the channel efficiency not only by increasing the number of simultaneous users without any multiple-access interference but by using a relatively short length CDMA codes.

본 논문에서는 대용량 광 부호분할 다중접속(Optical CDMA) 네트워크를 위해, 가변 파장변환기(TWC)와 도파로 열격자(AWG)를 이용한 공유형 부호기/복호기를 제안하였다. 제안한 부호기/복호기는 TWC의 동적 코드 할당 특성과 AWG의 순환(cyclic) 특성을 이용하여 다수의 가입자가 동일한 부호기와 복호기를 공유할 수 있도록 파장시간의 2차원 코드를 사용한다. 2차원 코드 구성 방법인 GMWPC(Generalized Multi-wavelength Prime Code)와 GMWRSC(Generalized Multi-wavelength Reed-Solomon Code)를 사용한 시뮬레이션을 통해 다수의 가입자를 위해 동적 코드 할당을 할 수 있는 제안한 부호기/복호기 구조의 타당성을 제시하였다. 제안한 부호기/복호기는 다중 접속 간섭을 일으키지 않으면서 동시 사용자 수를 증가시키며, 상대적으로 짧은 코드 길이를 사용함으로써 채널 효율을 향상시킬 수 있는 장점을 가지고 있다.

Keywords

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