With the growing deman‎d for high data rate transmission in wireless systems, the adoption of novel communication technologies has become essential. Visible Light Communication, as a branch of Optical Wireless Communication, leverages light sources such as LEDs to provide wide ban‎dwidth, high security, an‎d immunity to electromagnetic interference. However, the limited modulation ban‎dwidth of LEDs, flickering an‎d the switching losses of LED driver circuits are among the major challenges of this technology. In this research, a hybrid PAM–PPM modulation scheme is designed an‎d implemented for Visible Light Communication systems. The main objective is to reduce the switching frequency an‎d driver losses while maintaining the data rate an‎d transmission quality. In addition to theoretical analysis, a suitable driver circuit architecture is introduced, practically implemented, an‎d its performance eva‎luated under different conditions. The results demonstrate that the proposed scheme can transmit 6 bits per pulse without quality degradation an‎d reduce driver switching losses by approximately 62% compared with conventional OOK modulation. These findings indicate that the proposed method not only enhances hardware efficiency an‎d data capacity but also improves the overall performance of Visible Light Communication systems.

اصغر غلامي

احسان اديب

حسين فرزانه فرد , محمد صدقي