Abstract
This study proposes the optical wireless Code Shift Keying (CSK) with nonorthogonal sequences to improve the system performances of the Intensity Modulation Direct Detection (IM/DD) Optical Wireless Communications (OWCs). The proposed scheme systematically constructs nonorthogonal sequences. The proposed scheme is expected to improve the system performances of the IM/DD OWC. Optimum parameters can be used to obtain the best system performance; thus, this paper gives analytical expressions of the data transmission efficiency and delay property of the proposed scheme as a function of the system parameters. This paper analyzes the data transmission efficiency and the delay property of the proposed scheme considering the scintillation and background noise to evaluate the fundamental performance of the proposed system. This study also assumes a single-user case (i.e., single transmitter environment). The numerical results show that the data transmission efficiency and the delay property of the proposed scheme are better than those of the conventional schemes, regardless of the effect of the scintillation and/or background noise.
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