Date Added: Nov 2011
This paper investigates a new modulation scheme to achieve good power and spectral efficiencies with a coded modulation system. For IM/DD in optical Communication, PPM and MPPM have good power efficiencies but low spectral efficiencies. On the other hand, PAM achieves excellent spectral efficiencies. This new modulation scheme combines multiple level and multiple pulse position. The performance of this new modulation scheme present in terms of uncoded BER and cutoff rate. Multi-level modulation techniques are powerful in terms of spectral efficiency, whereas pulse position modulation is strong in terms of power efficiency.