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Performance Analysis of Optical CDMA System with Cross-Layer Concept  

Kim, Jin-Young (Kwangwoon University)
Kim, Eun-Cheol (Kwangwoon University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.46, no.7, 2009 , pp. 13-23 More about this Journal
Abstract
In this paper, the network performance of a turbo coded optical code division multiple access (CDMA) system with cross-layer, which is between physical and network layers, concept is analyzed and simulated. We consider physical and MAC layers in a cross-layer concept. An intensity-modulated/direct-detection (IM/DD) optical system employing pulse position modulation (PPM) is considered. In order to increase the system performance, turbo codes composed of parallel concatenated convolutional codes (PCCCs) is utilized. The network performance is evaluated in terms of bit error probability (BEP). From the simulation results, it is demonstrated that turbo coding offers considerable coding gain with reasonable encoding and decoding complexity. Also, it is confirmed that the performance of such an optical CDMA network can be substantially improved by increasing e interleaver length and e number of iterations in e decoding process. The results of this paper can be applied to implement the indoor optical wireless LANs.
Keywords
IM/DD : Intensity Modulation/Direct Detection; Optical; PPM : Pulse Position Modulation;
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