Reduce the effect of vignetting on MIMO optical wireless system by reducing BER of channel

Abstract

Vignetting is the process in which there is darkness at the edges as compared to center of image. Thus the process of vignetting can affect the performance of MIMO optical wireless communication (OWC) systems. The effect of the vignetting on a pixelated system is measured by using spatial OFDM. It is clear that vignetting can leads to the attenuation and ICI in the spatial orthogonal frequency division multiplexing. SACO-OFDM (spatial asymmetrical clipped optical) and SDCO-OFDM (spatial DC-biased clipped optical) are previous techniques which are used to reduce the impact of vignetting on signals. This paper investigates the result of vignetting on pixelated MIMO systems with OFDM. In this work, we reduce the effect of vignetting by reducing BER of channel using MATLAB simulator. After simulation it is proved that the proposed technique shows better accuracy than previous techniques.