Scientific Research and Essays

  • Abbreviation: Sci. Res. Essays
  • Language: English
  • ISSN: 1992-2248
  • DOI: 10.5897/SRE
  • Start Year: 2006
  • Published Articles: 2761

Full Length Research Paper

Performance improvement of hybrid SCM SAC-OCDMA networks using multi-diagonal csode

Thanaa Hussein Abd1*, S. A. Aljunid1, Hilal A. Fadhil1, Ibrahim Fadhil Radhi1,Ahmad R. B.1 and M. A. Rashid2
 1School of Computer and Communication Engineering, University Malaysia Perlis, Malaysia. 2School of Electrical Systems Engineering, University Malaysia Perlis, Malaysia.
Email: [email protected]

  •  Accepted: 13 March 2012
  •  Published: 31 March 2012


Hybrid Subcarrier Multiplexing (SCM) incorporating spectral amplitude coding optical code division multiple access (SAC-OCDMA) technology was investigated both mathematically and by simulation. The hybrid SCM/SAC-OCDMA system combined two schemes in such as a way that the resulting hybrid system is robust against the Multi- Access Interference (MAI) and much enhanced the channel data rate. In this paper, we describe the improved performance of the hybrid SCM/SAC-OCDMA system based on the use of spectral amplitude coding to suppress  impairments and to improve the overall system improve the overall sensitivity of system performance at a BER of 10-9. As a result, the proposed system based on Multi-Diagonal (MD) code shows better performance in comparison to the conventional code that employs the SAC-OCDMA system. We also evaluate the different design parameters under the maximum number of subcarriers (18 subcarriers in each optical channel) multiplexed for integrating OCDMA technology onto the existing fiber-wireless infrastructure at 155 M bit/s data rate for different fiber lengths. Further, a BER of 4.4 × 10-10 was achieved based on the proposed system for 45 km at 1.21 GHz.


Key words: Subcarrier multiplexing (SCM), spectral amplitude coding optical code division multiple access (SAC-OCDMA), multi diagonal (MD) code.