Abbas Ali Sharifi

The transmit signals in an OFDM system can have high peak values in the time domain since many subcarrier components are added via an IFFT operation. Therefore, OFDM systems are known to have a high Peak-toAverage Power Ratio (PAPR), compared with single-carrier systems. This article presents a novel approach to reduce the PAPR of the OFDM signals. The proposed method contains a digital FIR filter that its coefficients are adaptively changed to minimize the PAPR. At the receiver, the modulated symbols can be recovered by a reversed procedure. By way of computer simulation, using Adaptive Digital Filter (ADF) in OFDM systems is shown to compare favorably to conventional OFDM.