الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Optical Wireless Communications (OWC) has seen rapid development during
recent years. The visible light communication (VLC) systems have their unique
advantages, with several new technologies, products, and patents. They have
been developed since the end of the last century. This thesis proposes a VLC
system for indoor application. The objective of this work reduces the peak-toaverage power ratio (PAPR) and achieves acceptable bit error rate (BER)
performance for indoor use. The proposed techniques were evaluated through
computer simulations.
Orthogonal Frequency Division Multiplexing (OFDM) is used with visible
light communication (VLC) systems to reduce the effects of inter-symbol
interference (ISI) and to achieve communication with high speed of data
transmission using huge bandwidth. However, OFDM-based VLC systems
suffer from high PAPR.
Filter Bank Multicarrier (FBMC) attracts the researchers and industry towards
the next-generation wireless communication. Currently, FBMC with offset
quadrature amplitude modulation is an alternative waveform contender for the
OFDM for 5G mobile communication to achieve the basic requirements of high
data rates and better spectral properties.
The work can be divided into three main parts. The first part gives a detailed
overview of the OWC, VLC, and OFDM systems. This is followed by an
overview of the PAPR problem in multicarrier systems. The second part study
suggests that FBMC based VLC has a great potential for future high-speed
optical wireless communication systems. Due to their advantages in reducing the
PAPR without impacting the BER, the Hadamard transform was used in the
proposed FBMC based VLC system. Furthermore, in this thesis, the discreet
cosine transform (DCT) precoding is also used to boost the potential for PAPR
reduction and the BER efficiency.
In the third part, a new non-redundant three-layer peak-to-average power ratio
(PAPR) reduction technique is proposed for filter bank multicarrier communication-based visible light communication FBMC based VLC systems.
The results show that the proposed technique can achieve good CCDF
performance, especially when using 𝐴3 = 0.6. Moreover, we can achieve a
good trade-off between PAPR reduction and BER performance when selecting
a scaling factor of 𝑠 = 0.3.