Design and analysis of an OFDM-based orthogonal multilevel code-shifted differential chaos shift keying

Fadhil S. Hasan, Hayder F. Fahad

Abstract


In this paper, a new non-coherent chaos-based communication that combined orthogonal multilevel code-shifted differential chaos shift keying with orthogonal frequency division multiplexing named (OFDM-OMCS-DCSK) modulation system. New orthogonal chaotic signal sets are generated by hybrid gram-schmidt algorithm and walsh code function and used it to carry high data rate in the same time slot. The bandwidth efficiency of the OFDM-OMCS-DCSK system is comparing with conventional system. Also, the BER analytic expressions are derived under (AWGN) and multipath Rayleigh fading channels and comparing with the simulation results. Furthermore, the BER performance is compared with OFDM-DCSK to found that the proposed system has the best BER performance with high data rate feature.


Keywords


Differential chaos shift-keying; Gram-schmidt algorithm; High data rate; Multilevel code-shifted; Multiplexing; Orthogonal chaotic vectors; Orthogonal frequency division; Walsh function

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DOI: http://doi.org/10.11591/ijeecs.v20.i3.pp1369-1378

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The Indonesian Journal of Electrical Engineering and Computer Science (IJEECS)
p-ISSN: 2502-4752, e-ISSN: 2502-4760
This journal is published by the Institute of Advanced Engineering and Science (IAES) in collaboration with Intelektual Pustaka Media Utama (IPMU).

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