PAPR Reduction in OFDM Systems Using PTS: With New Phase Sequences

Along with the advantages of OFDM signals like high spectral efficiency and robustness against ISI, main drawback of OFDM signals is high PAPR. Many techniques are proposed to reduce PAPR including amplitude clipping, clipping and filtering, coding, tone reservation (TR), tone injection (TI), active constellation extension (ACE), partial transmit sequence (PTS), selected mapping (SLM) and interleaving. One of the effective methods, Partial Transmit Sequence is described in this article. In the conventional PTS (C-PTS) several inverse fast Fourier transform (IFFT) operations and complicated calculations to obtain optimum phase sequence, increase computational complexity of C-PTS. But in new proposed phase sequence the number of IFFT operations is reduced to half at the expense of a slight PAPR degradation. In this paper, a technique is proposed to reduce the number of IFFT operations to half at the expense of a slight PAPR degradation. Simulations are performed in Matlab with QPSK modulation with OFDM signal.