Author: Mao, Jiaqian
Title: PAPR reduction for visible light communication system with DFT-spreading OFDM
Degree: M.Sc.
Year: 2017
Subject: Hong Kong Polytechnic University -- Dissertations
Optical communications
Wireless communication systems
Orthogonal frequency division multiplexing
Signal processing -- Digital techniques
Department: Department of Electronic and Information Engineering
Pages: vi, 64 pages : color illustrations
Language: English
Abstract: Recently, with the shortage of the spectrum bandwidth and the requirements for higher data rate transmission, a novel wireless communication method, called Visible Light Communication (VLC), has been studied by the researchers with increasing interests, which has many advantages over the traditional RF wireless communication. OFDM has been a popular modulation technique for realizing VLC systems, but it has its own drawbacks. One of the shortcomings we cannot neglect is the high peak-to-average power ratio (PAPR) of the output signals at the transmitter, which degrades the system performance. Hence, PAPR reduction in VLC system is taken into account. In this thesis, DFT-spreading technique is adopted in the OFDM based VLC system to decrease the PAPR value of the transmit signals. Firstly, the principles of VLC system and OFDM modulation scheme for VLC have been studied. Then, the theoretical analysis of DFT-spreading technique is derived in detail, which can be classified into two types: interleaved DFT-spreading (IDFT-S) and localized DFT-spreading (LDFT-S). Then, the VLC system with DFT-spreading OFDM is simulated in MATLAB, which is to verify the realization of PAPR reduction in VLC system. The PAPR and BER performances are discussed according to the simulation results. Finally, the hardware experiment is accomplished in a real VLC system. Based on the results, the the system performances are compared.
Access: restricted access

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