PAPR Reduction Using Low Complexity PTS to Construct OFDM Signal

Abstract

Orthogonal frequency division multiplexing has become evident due to its higher frequency multiplicity to achieve high data rate and greater immunity to multipath fading. The imperative drawback of OFDM is its high peak-to-average power ratio which results in power inefficiency. There are numerous techniques used to overcome problem of high PAPR in OFDM modulation system. Partial transmit sequence (PTS) is most prominent peak-to-average power ratio (PAPR) reduction techniques proposed for orthogonal frequency-division multiplexing (OFDM) systems. The main drawback of the conventional PTS (C-PTS) is its higher computational complexity and transmission of several side information bits. A new PTS with simple detector is recommended here to deal with these drawbacks of C-PTS. The candidates can be generated by cyclically shift of each sub block sequence in time domain and combining them in a recursive manner. At the receiver, by using the natural diversity of phase constellation for different candidates, the detector can successfully regain the original signal without side information. The probability of detecting failure of the side information found that detector can work without any side information with high reliability. The scheme in this paper achieves almost the same bit error rate (BER) performance as the C-PTS with perfect side information, under additive white Gaussian noise (AWGN) channel and Rayleigh fading channel.