Improved IPTS Algorithm in OFDM System Based on GNU Radio

Aiming at the problem of peak-to-average power ratio (PAPR) in Orthogonal Frequency Division Multiplexing (OFDM) systems, a low complexity IPTS algorithm is introduced and it is used to develop a signal processing block on GNU Radio platform. In algorithm, a certain amount of time domain signal sample points are seek out by setting a proper threshold and only the selected points are used to search for PAPR suppression phase. The simulation shows that the algorithm can reduce computational complexity while maintaining the PAPR suppression performance. A signal processing module for PAPR suppression that using the algorithm is developed based on Linux, so that the function of PAPR suppression is achieved in gnuradio-companion.