Abstract
A new interference cancellation technique for direct-detection optical code- division multiple-access (OCDMA) network employing pulse-position modulation (PPM) is proposed in this paper. The multiple access interference (MAI) estimation is achieved by pre-reserving one of optical spreading code sequences at the receiver based on the correlation property of padded modified prime codes (PMPC). The estimated interference is then cancelled out after photo-detection process. Additionally, the transmitted signal is Manchester-coded to further improve the system performance. Based on this proposed interference canceller in a shot-noise limited regime, we have obtained an expression for the upper bound of the bit-error probability (BEP) taking into account effects of both MAI and shot-noise. This BEP is compared with that of a PPM-OCDMA without cancellation. Finally, the receiver structure of the proposed optical network unit (ONU) is fairly simple to compare with the conventional cancellation schemes.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Karbassian, M.M., Ghafouri-Shiraz, H.: Fresh prime codes evaluation for synchronous PPM and OPPM signaling for optical CDMA networks. J. Lightwave Technol. 25(6), 1422–1430 (2007)
Kwong, W.C., Perrier, P.A., Pruncnal, P.R.: Performance comparison of asynchronous and synchronous code-division multiple-access techniques for fiber-optic local area networks. IEEE Trans. Commun. 39(11), 1625–1634 (1991)
Lee, T.S., Shalaby, H.M.H., Ghafouri-Shiraz, H.: Interference reduction in synchronous fibre-optical PPM-CDMA systems. Microwave Opt. Technol. Lett. 30(3), 202–205 (2001)
Liu, M.Y., Tsao, H.W.: Cochannel interference cancellation via employing a reference correlator for synchronous optical CDMA system. Microwave Opt. Technol. Lett. 25(6), 390–392 (2000)
Liu, F., Karbassian, M.M., Ghafouri-Shiraz, H.: Novel family of prime codes for synchronous optical CDMA. J. Opt. Quant. Electron. 39(1), 79–90 (2007)
Shalaby, H.M.H.: Cochannel interference reduction in optical PPM-CDMA systems. IEEE Trans. Commun. 46(6), 799–805 (1998)
Shalaby, H.M.H.: Synchronous fiber-optic CDMA systems with interference estimators. J. Lightwave Technol. 17(11), 2268–2275 (1999)
Wakafuji, K., Ohtsuki, T.: Direct-detection optical CDMA receiver with interference estimation and double optical hardlimiters. J. Lightwave Technol. 21(10), 2182–2188 (2003)
Wu, J., Gu, F., Tsao, H.: Jitter performance analysis of SOCDMA-based EPON using perfect difference codes. J. Lightwave Technol. 22(5), 1309–1319 (2004)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Ghafouri-Shiraz, H., Karbassian, M.M. & Liu, F. Multiple access interference cancellation in Manchester-coded synchronous optical PPM-CDMA network. Opt Quant Electron 39, 723–734 (2007). https://doi.org/10.1007/s11082-007-9134-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11082-007-9134-0