Loading...

Soft-input decoder for decoding of internally channel coded fiber-optic CDMA communication systems

Azmi, P ; Sharif University of Technology | 2002

209 Viewed
  1. Type of Document: Article
  2. DOI: 10.1109/TCOMM.2002.806505
  3. Publisher: 2002
  4. Abstract:
  5. In this paper, we propose using a soft-input decoder for the decoding of internally convolutional coded Poisson noise-dominated fiber-optic code-division multiple-access (CDMA) communication systems using optical orthogonal codes. We first compute the coded symbol log-likelihoods at the output of the Poisson noise-dominated channel, which is then used by a soft-input maximum-likelihood decoder, for a fiber-optic CDMA system assuming both on-off keying and binary pulse position modulation schemes. Furthermore, we develop a discrete soft-output channel model for a Poisson noise-dominated channel, with which we evaluate the upper bound on the bit error probability of the internally coded Poisson noise-dominated fiber-optic CDMA system using a soft-input decoder. It is shown that the soft-input decoder significantly outperforms the hard-input decoder. Furthermore, the performance of the soft-input decoder is also evaluated in the presence of different values of dark current
  6. Keywords:
  7. Channel codes ; Fiber-optic code-division multiple-access (CDMA) ; Optical orthogonal codes (OOC) ; Poisson noise-dominated channel ; Soft-input decoder
  8. Source: IEEE Transactions on Communications ; Volume 50, Issue 12 , 2002 , Pages 1994-2002 ; 00906778 (ISSN)
  9. URL: https://ieeexplore.ieee.org/abstract/document/1175476