IJMTES – ENHANCED TRANSMISSION USING TDM-OFDM IN PASSIVE OPTICAL NETWORKS

Journal Title : International Journal of Modern Trends in Engineering and Science

Author’s Name : R.Dharsini

Volume 01 Issue o5  Year 2014  

ISSN no:  2348-3121 

Page no: 79-85

Abstract—Currently, digital signal processing methods have been widely studied and various DSP based schemes have been nominated for next-generation passive optical network (PON). A hybrid technique is proposed which combines time-division-multiplexing (TDM) architecture with advanced DSP methods to achieve high spectrum-efficiency colorless transmission. Orthogonal frequency division multiplexing (OFDM) with frequency-domain equalization, is chosen for both upstream and downstream transmissions. A DSP-based evolution scheme from customary TDM-PON to TDM-OFDM-PON is suggested and experimentally analyzed by upgrading the optical line terminal (OLT), which can maintain the current optical distribution network (ODN). This paper proposes and experimentally demonstrates the chaos scrambling for a secure time division multiplexing with orthogonal frequency-division-multiplexing passive optical network (TDM-OFDM-PON) based on. The Logistic map is adopted for the chaos mapping. The chaos scrambling algorithm the confidentiality of the physical layer is enhanced by  dynamically allocate the scrambling matrices for different OFDM frames according to the initial condition, which enhance. Hence  a secure transmission at physical layer is achieved in TDM-OFDM-PON for data encryption. The results indicate the robustness against eavesdropping. Hence enhances the quality of service.

Keywords— OFDM-PON, orthogonal frequency division multiplexing (OFDM), passive optical network (PON), TDM-OFDM-PON,Scrambling.

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