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OFDM PAPR Reduction by Pre-Scrambling and Clipping

By Alberts Zeļenkovs and Anna Litviņenko


This article presents a new method for Peakto- 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 msequence 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 blocktypepilot 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

Topics: Orthogonal Frequency Division Multiplexing, Peakto- Average Power Ratio, pre-scrambling
Publisher: IEEE
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