PAPR reduction for OFDM systems using clipping and square rooting techniques

Authors:
T. Deepa;R. Kumar
Affiliations:
SRM University, Kattankulathur, Tamil Nadu, India;SRM University, Kattankulathur, Tamil Nadu, India
Venue:
Proceedings of the International Conference on Advances in Computing, Communications and Informatics
Year:
2012

Citing 4
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Abstract

Orthogonal Frequency Division Multiplexing (OFDM) is an efficient modulation technique for high data rate communication systems. Peak to Average Power Ratio (PAPR) is one of majors problems in OFDM system. In this paper, a joint clipping and square rooting (SQRT) method has been suggested and investigated for PAPR reduction of OFDM signal. The SQRT process changes the statistical characteristics of the OFDM signal from Rayleigh distribution to Gaussian like distribution after the clipping process. This change in statistical distribution results changes of both the peak and average power values of OFDM signals, and consequently reduces significantly the PAPR value. This technique decreases the bit error rate (BER) slightly while significantly reduces the PAPR value. For 64-QAM OFDM system with 1024 subcarriers, up to 7 dB PAPR reductions with fixed degradation in bit error rate (BER) equal to 2.5 dB can be achieved by combining both clipping and square rooting scheme.