PWM Technique To Overcome The Effect of High PAPR in Wireless Systems

Many current communication systems suffer from performance degradation due to the high sensitivity to high power peaks especially in the nonlinear devices. The author introduces a new concept based on the Pulse Width Modulation (PWM), namely MIMO-OFDM system based PWM (MO-PWM) to overcome this deficiency. Here, the peak-to-average power ratio (PAPR) problem in Orthogonal Frequency Division Multiplexing (OFDM) technique is used as a criterion to check the validity of the proposed work. Moreover, the proposed system work has been implemented over Field Programmable Gate Array (FPGA), which is designed to characterize both of the complexity and the speed issues. The systems performance based MO-PWM and validity have been checked based on a numerical analysis and a conducted simulation. The simulation results show that the MO-PWM can clearly reduce the PAPR values nevertheless the used OFDM systems’ specifications, and gives a promising results over some techniques found in the literature, such as clipping, SLM and PTS under same bandwidth occupancy and system’s specifications.