Adaptive DCO-FBMC in Visible Light Communication

Abstract

Filter Bank multicarrier (FBMC) has been modified for VLC. FBMC is the main filter suitable for high-speed data transfer using multicarrier modulation (MCM). Therefore, the FBMC is an appropriate alternative to the OFDM system which suffers from several weaknesses like limited bandwidth due to the presence of the cyclic prefix (CP). FBMC has been adapted to IM / DD compliant using Hermitian Symmetry to make the real signal, but this method increases system complexity and power consumption. In this paper, FBMC was adapted using a different technique than the above which consisted of generating an original complex FBMC signal. The signal was then dismantled into two real and imaginary parts (juxtaposing the real and imaginary parts of the complex signal in the time domain), thus the imaginary signal turned real. The proposed technique saved 50% in the number of the FFT/IFFT (Inverse Fast Fourier Transformer/Fast Fourier Transformer) operations, which resulted in a great decrease in power consumption and the occupied chip area.