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Multiple access interference cancellation in Manchester-coded synchronous optical PPM-CDMA network

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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.

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Authors and Affiliations

  1. Department of Electronic, Electrical and Computer Engineering, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

    H. Ghafouri-Shiraz & M. M. Karbassian

  2. ZTE Co. Ltd., Keji Road South, Hi-Tech Industrial Park, Nanshan District, Shenzhen, China

    F. Liu

Authors
  1. H. Ghafouri-Shiraz
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  2. M. M. Karbassian
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  3. F. Liu
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Correspondence to H. Ghafouri-Shiraz.

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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

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  • DOI: https://doi.org/10.1007/s11082-007-9134-0

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