ROBUST AND EFFICIENT PAPR REDUCTION FOR OFDM SYSTEM USING OPSIPTS TECHNIQUE

Abstract

To achieve better performance using multi carrier modulation we should make the subcarriers to be orthogonal to each other i.e. known as the Orthogonal Frequency Division Multiplexing (OFDM) technique. But the great drawback of the OFDM method is its high Peak to Average Power Ratio (PAPR). As we are using the linear power amplifier at the transmitter side so it’s operating point will go to the saturation region due to the high PAPR which leads to in-band distortion & out-band radiation. This can be evaded with growing the dynamic range of power amplifier which hints to high cost & high consumption of power at the base station.It is known that the PAPR reduction arrangements can be generallycategorized into two groups, i.e. distortion-less systems such as SLM & PTS & the pre-distortion systems such as clipping & companding. In this Paper, we demonstrate the performance of our proposed OPSIPTS algorithm which has been compared with the existing PAPR reduction approaches using MATLAB simulations. The proposed techniqueexploited traditional Partial transmit sequence technique& we advanceaidea of phase shifting/reversal& interleaving of sequence after dividing the OFDM symbols into subblocks. We proved that proposed PAPR reduction perform much better than standard methods like Amplitude clipping, selective mapping, PTS projected in [34] with respect to CCDF.