Performance enhancement for indoor visible light communication system with an improved inter-symbol interference model using optimized hemispherical optical-angle-diversity-receivers

Several hemispherical optical receivers based on angle diversity technology are optimized to achieve better reception for multiple-input multiple-output (MIMO) visible light communication (VLC) system with an improved inter-symbol interference (ISI) model. The optimal parameters are obtained via analyzing the performances under different diversity dimensions, spatial distances between adjacent photodiodes (PDs) and inclination angles. The simulation results reveal that under the condition of optical angle diversity receiver (OADR) with 4 PDs, the optimal spatial distance between adjacent PDs is 0.1 m and the inclination angle is 50∘, respectively. Compared with common plane model of 4 PDs, the average SNR has increased by 15.2%. It is no doubt that the OADR is a kind of promising alternative for indoor visible light communications.