An Improved Algorithm to Reduce PAPR Based Clipping-and-Filtering

One of the main disadvantages of Orthogonal Frequency Division Multiplexing (OFDM) is its high peak-to- average power ratio (PAPR). As the simplest approach to reducing the PAPR, clipping exhibits good practicability, and the repeated clipping-and-filtering (RCF) algorithm proposed by Jean Armstrong provides a good performance in PAPR reduction and out-of-band power´s filtering. However, its way of filtering in frequency-domain requires RCF operations to control the peak regrowth, which degrades the bit error rate (BER) performance and greatly increases the computational complexity. Therefore, this paper put forward a new method of utilizing Hanning window to filter the out-of-band noise in the frequency- domain. The simulation results show that, this method can still limit the out-of-band power to meet the requirement of transmit spectrum mask specified in the IEEE802.11a standard. Moreover, it dramatically reduces the PAPR as well as provides lower BER and computational complexity.