Hybrid Multipulse Amplitude and Position Modulation for Optical Wireless Communication System

This paper presents a Hybrid Multipulse Amplitude and Position Modulation (H-MPAPM) scheme for Optical Wireless Communication (OWC) system. H-MPAPM is a combined version of the Pulse Amplitude Modulation (PAM) and Gradual Multipulse Pulse Position Modulation (Gradual MPPM) where the transmitted information is encoded in the amplitude and position of multiple optical pulses. The performance measures in terms of the number of bits-symbols per frame, power requirements and bandwidth-utilization efficiency for the proposed scheme are derived and compared with MPPM, Gradual MPPM and Multiple Pulse Amplitude and Position Modulation (MPAPM) schemes. It is shown that the proposed scheme allows more symbols and bits transmission per frame and achieves higher bandwidth-utilization efficiency than MPPM, Gradual MPPM and MPAPM. However, in terms of the power requirements, the MPPM and Gradual MPPM outperforms the proposed modulation scheme. Thus, the proposed scheme displays a significant improvement in terms of the transmitted symbols and the bandwidth-utilization efficiency.