PAPR reduction of OFDM signal by using hadamard transform in companding techniques

OFDM is an attractive modulation technique for transmitting large amounts of digital data over radio waves. One major disadvantage of OFDM is that the time domain OFDM signal which is a sum of several sinusoids leads to high peak to average power ratio (PAPR). In this paper, a joint companding transform and hadamard transform method is proposed to reduce peak-to-average of OFDM signal. Simulation results show that the proposed scheme may obtain significant PAPR reduction while maintaining good performance in the BER compared to ordinary companding method.