Spectrum Analysis of Multi-Pulse Position Modulation under Same Transmission Condition

Multiple pulse position modulation (MPPM) is proposed as a modulation method to improve the band-utilization efficiency. It is a variation of pulse-position modulation (PPM) offering improved band-width efficiency and improved power efficiency. Like PPM, however, the power efficiency of MPPM degrades rapidly in the face of multipath dispersion. In this paper, firstly the optimum number of the pulses and slots can be confirmed, and its spectrum characteristics and properties in AWGN are simulated by using multi-pulse position modulation(MPPM). by analyzing and comparing its magnitude spectrums for some different shapes with diffenrent signals after Fourier transformation, it is easy to get some conclusions, then analyze its transmission effect and properties to select the best wave shapes in the same tranmission conditions.