OFDM PAPR reduction by pre-scrambling and clipping

This article presents a new method for Peak-to-Average Power Ratio (PAPR) reduction of Orthogonal Frequency Division Multiplexing (OFDM) signal. The proposed method is based on a relatively simple processing - pre-scrambling of OFDM symbol bit-block. The modified m-sequence with the least peak-factor for scrambling is used. The stability of pre-scrambled OFDM signal to the clipping is examined as well. C/C++ computer simulation of OFDM system with 64 subcarriers and frequency domain block-typepilot channel estimation is performed for AWGN multipath channel. As a result, bit error rate (BER) performance for various clipping levels is presented due to computer simulation. In addition, the Efficiency of joined pre-scrambling and clipping method is considered.