Peak to average power ratio (papr) Reduction in an ofdm system using Combined nth root with different Techniques

Abstract

High data rate and speedy communication has become the ultimate goal of any communication research work. Multiplexing of signal bits is an important part of the wireless communication system. OFDM (Orthogonal Frequency Division Multiplexing) has become a promising technique at present days wireless communication technology due to its extraordinary features. This thesis paper represents a total overview of OFDM system, basic principles of OFDM system, OFDM generation and reception. Though it has some salient and supreme features over other multiplexing techniques, still has some drawbacks which limit its performance in some cases. So an investigation has been done to minimize the effects of these drawbacks, especially emphasis is put on to reduce the PAPR (Peak to Average Power Ratio) of OFDM signals. Several techniques to minimize PAPR has been investigated and finally some new techniques have been proposed to minimize PAPR. An elaborate analysis is carried out by plotting CCDF curve in MATLAB demonstrating a picturesque comparison between our proposed technique and other methods individually. The obtained results show that the proposed system is better than its competitors when considering the three performance criteria together.