Peak to average power ratio reduction in OFDM system using hybrid technique

Abstract

There are many benefits of utilizing OFDM like robustness and high spectral efficiency against ISI but still there are some disadvantages. The main problem that arises in OFDM systems is high PAPR. There are many techniques available for reduction of PAPR like tone reservation (TR), clipping and filtering, partial transmit sequence (PTS), active constellation scheme, interleaving and selected mapping (SLM). Clipping and filtering are the easiest techniques but they are not suitable when large number of sub-carriers are present. The most common techniques used for PAPR reduction are PTS and SLM. PTS and SLM algorithms have achieved good performance in PAPR reduction. A new method is proposed in this paper which is hybrid combination of PTS and SLM and this method has also reduced the PAPR from 6 to 5. The results are compared with the already available techniques and this method achieves better results.