Low complexity DCO-FBMC visible light communication system

Filter Bank Multicarrier (FBMC) is a new waveform candidate in the visible light communication system (VLC). FBMC is a distinctive kind of multi-carrier modulation that can be regarded as an alternative to orthogonal frequency Division Multicarrier (OFDM) with CP (cyclic prefix). DCO-FBMC (DC-bias optical FBMC) has recently been used in VLC, because it overcomes all defects in the optical-OFDM system and has high spectral efficiency. but at the same time the traditional DCO-FBMC suffers from high complexity due to the use of Hermitian Symmetry for real signal, by using 2N-point subcarrier IFFT (Inverse Fast Fourier Transformer) in the modulator, and the output is N-point subcarrier FFT (Fast Fourier Transform) in the demodulator. In this paper, for the first time, the possibility of minimizing complexity and generating a real signal without the use of Hermitian Symmetry or any other technique has been verified. The proposed technology provides 50% of the size of the IFFT / FFT and this results in a significant reduction in power consumption and occupied chip area

Signal-to-Noise and Bit Error Rate Analysis of Indoor Visible Light Communication Link Using Non-Line-of-Sight Model

Visible Light Communication (VLC) merupakan salah satu teknologi komunikasi nirkabel yang populer saat ini. Dengan keterbatasan frekuensi radio spectrum (bandwidth), Visible Light Communication (VLC) yang menggunakan LED (Light Emitting Diode) dengan panjang gelombang antara 380-700 nm untuk membawa informasi memiliki keuntungan lebih dibandingkan sistem komunikasi nirkabel menggunakan radio frekuensi. Pada thesis ini daya yang diterima oleh sistem VLC non-line-of-sight model dengan adanya pengaruh angle dari field of view dan pengaruh jarak akan ditampilkan. Untuk analisis kinerja, teknik modulasi yang digunakan pada proyek ini adalah OOK-NRZ. Simulasi analisis kinerja pada thesis ini menunjukkan pengaruh bit rate dan receive power terhadap nilai SNR dan BER pada sistem.Kata Kunci – Visible Light Communication, Field of View, Bit Error Rate, Received Power, Signal to Noise Ratio, Indoor VL