C42. PAPR reduction for LFDMA using a reduced complexity PTS scheme

Three subcarrier mapping schemes are used for single carrier frequency division multiple access (SC-FDMA) system: interleaved (IFDMA), distributed (DFDMA) and localized (LFDMA) subcarrier mapping. Comparison between these schemes showed that the peak to average power ratio (PAPR) for both IFDMA and DFDMA systems is less than that of LFDMA system. In this paper, a low complexity Partial Transmit Sequence (PTS) technique is proposed for the reduction of PAPR in LFDMA system by generating the candidates using the time domain cyclical shift of each sub-block sequence and combining them in a recursive manner. This enables the detector to recover the original signal without needing side information. In this paper, mathematical analysis is explained in details for both the conventional PTS (C-PTS) scheme and the proposed PTS (P-PTS) scheme. Also, computational complexity comparison is performed between the C-PTS and P-PTS schemes.