Title: DWT OFDM SYSTEMS WITH REDUCED PAPR FOR NEXT GENERATION MOBILE NETWORKS

Year of Publication: Jun - 2012
Page Numbers: 342-348
Authors: Y. A. LAFTA, P. JOHNSON
Conference Name: The International Conference on Informatics and Applications (ICIA2012)
- Malaysia

Abstract:


Peak to power average ratio (PAPR) is a serious issue in OFDM systems. Several techniques have been proposed by researchers to reduce PAPR. A technique proposed, by Tellambura applies real-valued modulation schemes to reduce PAPR in systems using a limited number of subcarriers. However, the technique has not been evaluated for its performance of bit error rate using discrete time approximations of the continuous-time PAPR. On other hand, Wong proposed a technique that applies complex modulation as a practical technique for computing the continuous-time peak-to-average to power ratio (PAPR) of OFDM. However, this technique does not consider coherent multilevel modulation scheme. Khalid and Shah have proposed to select the best wavelet packet basis function to decrease the PAPR. This technique results in no less than 1-2 dB reduction in PAPR. Jiang proposed a new companding transform for PAPR reduction in OFDM systems, which was shown to improve PAPR by no less than 2.2 dB. In this paper, combination of DWT OFDM with 64DAPSK is proposed for better BER performance and improved PAPR and interference values. It is demonstrated that including companding with this system results in further reduction of PAPR.