الفهرس | Only 14 pages are availabe for public view |
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. |