Reduction in Peak to Average Power Ratio of Ofdm Signals through -law Companding Technique

Orthogonal frequency Division multiplexing (OFDM) is the most familiar word in telecommunication and wireless communication systems as it provides enhanced spectral efficiency than Frequency division multiplexing (FDM).Although it is sustaining an orthogonal relation betweencarriers but high peak to average power ratio (PAPR) is one of the main disadvantages of OFDM system.Various PAPR reduction techniques have been used, including techniques based on companding. Incompanding, -Law companding has potential to reduce the PAPR of OFDMsignals. -Law Companding technique preserves the dynamic range of samples at low amplitudes.A new method named as precoding which is having less complexity compared to the other power reduction techniques is proposed to reduce PAPR. This paper put forward combination of two existing techniques namely -Law Companding Transform and Discrete Cosine Transform-II precoding technique. The simulation results show that, the proposed combinedscheme gives better result for PAPR Reduction and results in no distortion.