Indian Journal of Science and Technology
DOI: 10.17485/ijst/2019/v12i17/144623
Year: 2019, Volume: 12, Issue: 17, Pages: 1-10
Original Article
Agha Yasir Ali*, Razia Zia, Lubna Farhi, Sadia Ahmed, Umm E Laila
Sir Syed University of Engineering and Technology, Karachi City, Sindh, Pakistan; [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]ssuet.edu.pk
*Author for correspondencd
Agha Yasir Ali
Sir Syed University of Engineering and Technology, Karachi City, Sindh, Pakistan.
Email: [email protected]
In this paper, an improved version of existing modulation schemes is investigated by inserting Hadamard codes (HC) at the peak slot of each symbol for the Visible Light Communication (VLC) system. The performance of the proposed scheme is analyzed and compared with existing schemes On-Off Keying (OOK), Pulse Position Modulation (PPM), Differential PPM (DPPM), Pulse Amplitude Modulation (PAM), Differential Amplitude PPM (DAPPM) and Differential Pulse Interval Modulation (DPIM). Moreover, the symbol error rate (SER) for kth PAM is derived for ds distances between symbols. The performance in Symbol Error Rate (SER) is improved by introducing the Positive and Negative Amplitudes (PNA) levels with respect to DC-bias. The theoretical and simulation results show that the proposed scheme outperforms the existing schemes in terms of bandwidth, and transmission capacity.
Keywords: Hadamard Code Matrix, Modulation, Visible Light Communication
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