PAPR reduction in OFDM systems using clipping based on symbol statistics

Abstract

A method for Peak-to-Average Power Ratio (PAPR) reduction in an OFDM system is presented using clipping based on the statistics of a large number of OFDM symbols. The clipping technique uses scaled values of standard deviations of real and imaginary parts of complex discrete samples of OFDM symbols. The trade-off between PAPR and BER for this clipping technique is examined, using extensive numerical simulations, as a function of clipping level aσR/I for 0 < σR/I < 4, where σR/I denotes the standard deviations of real and imaginary parts of QPSK mapped OFDM symbol samples. It is noted that the clipping technique provides smooth control of PAPR reduction as function of the clipping level.