Multiple access interference cancellation in Manchester-coded synchronous optical PPM-CDMA network |
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Authors: | H Ghafouri-Shiraz M M Karbassian F Liu |
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Institution: | (1) Department of Electronic, Electrical and Computer Engineering, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK;(2) ZTE Co. Ltd., Keji Road South, Hi-Tech Industrial Park, Nanshan District, Shenzhen, China |
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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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Keywords: | Multiple access interference Prime code families Synchronous optical CDMA |
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