Peak-To-Average Power Reduction of Ofdm Signals Using Adaptive Digital Filter

The high peak-to-average power ratio (PAPR) of the transmitted signal is a major drawback in an OFDM system. In this paper, we propose a novel method to reduce the PAPR of the OFDM signals. The presented method adaptively filters the modulated data (M-PSK and QAM) to obtain OFDM symbols with a minimized PAPR. With optimally selected digital filter coefficients, the PAPR of the OFDM symbols can be minimized. The PAPR reduction of OFDM signals varies with the order of the digital filter. In a receiver, the modulated data may be recovered by a reversed procedure. Simulation study demonstrates that our method is more superior than the PCR method for the PAPR reduction