Author : Mr. Amol J. Bhakte 1
Date of Publication :7th April 2016
Abstract: Wireless communication system is one of the important aspects in communication technology by using LED lights. Visible Light Communication OFDM system is a new way of data communications medium using visible light. Visible light frequency spectrum bandwidth ranges from 400 THz to 800 THz. Visible light communication technology enabling data transmission by using light emitting diode (LED). This device has attracted much attention in recent communication system. Orthogonal frequency division multiplexing modulation technique plays an important role in long distance communication system. The OFDM is a multi-carrier modulation scheme which enables transmission of multiple signals; simultaneously over a single transmission path. Orthogonal Frequency Division Multiplexing (OFDM) has been widely used in wireless communications technology due to its high data rate, frequency selective fading and immunity to delay spread and other advantages, but besides these benefits the main disadvantages is the high peak to average power ratio (PAPR). This peak to average power ratio is an important feature to analyze the system performances. PAPR will increase the system complexity and reduce the communication system performance. High PAPR limit the application of OFDM system. To reduce the OFDM signal peak to average power ratio (PAPR) in VLC system, the Selected Mapping (SLM), Partial Transmit Sequence (PTS) and Discrete Fourier transform spread (DFT-S) techniques are used. In this paper for PAPR reduction all above three techniques are used to further reduced PAPR at lower value. For statistical analysis of PAPR the Complementary Cumulative Distribution Function (CCDF) is used. Performance analysis in terms of CCDF plots will be shown.
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