Companding transform is a simple and efficient method in reducing the Peak to Average Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM) systems. In this project, a novel nonlinear companding scheme is proposed to reduce the PAPR and improve Bit Error Rate (BER) for OFDM systems. This proposed scheme mainly focuses on compressing the large signals, while maintaining the average power constant by properly choosing transform parameters. Moreover, analysis shows that the proposed scheme without decompounding at the receiver can also offer a good BER performance. Finally, simulation results show that the proposed scheme outperforms other companding scheme in terms of Spectrum sidelobes,PAPR reduction and BER performance.

Introduction, Problem Statement,Existing System,OFDM system, problem formulation, Proposed system Proposed Scheme, Results and Discussion