Nonlinear companding technique for PAPR reduction in OFDM

In the current scenario, the increasing demand of high speed data transfer in wireless communication has been raised the requirement and optimization of orthogonal frequency division multiplexing (OFDM) based system like Advanced Long Term Evolution system. But, the main problem with OFDM based system is the high value of Peak-to-Average Power Ratio (PAPR) of the transmitted signals. In this work, an improved nonlinear companding technique has been proposed that can transform the Gaussian distributed OFDM signals into the set of threshold based uniform distributed signals while maintaining the same average power level. The simulation results indicate that the proposed companding technique performs better than the μ-law, exponential and nonlinear companding techniques in the terms of PAPR reduction as well as reduced numerical value of bit error rate.