A modified clipping algorithm for reduction of PAPR in OFDM systems

In the present scenario, orthogonal frequency division multiplexing (OFDM) systems are greatly utilized in multimedia applications due to their robustness to frequency selective fading channels. OFDM forms the basis for various wireless standards due to its high data rate achieving potential and high spectral efficiency. Despite these advantages, the challenge faced in implementing OFDM system, is high peak to average power ratio (PAPR) that degrades the system performance. To overcome the problem of PAPR, a modified clipping algorithm is proposed in this paper. In the present scheme, successive peaks are clipped adaptively. The complementary cumulative distribution function (CCDF) and the bit error rate (BER) performance for the present scheme are analyzed. The simulation results reveal that appreciable reduction in PAPR of around 4dB may be obtained in the proposed technique.