PAPR OPTIMIZATION OF SC-FDMA SIGNAL USING M-ARY SIGNALING

The major advantage of using Single Carrier Frequency Division Multiple Access (SC-FDMA) instead of Orthogonal Frequency Division Multiplexing (OFDM) in uplink of Long Term Evolution (LTE) is the low Peak to Average Power Ratio (PAPR) of SC-FDMA signal which benefits the mobile station (MS) which has limited power. it provides while retaining the performance and not more complex than OFDM. This paper aims at proposing a new technique, of employing M-ary Pulse shaping in SC-FDMA. We compare Complementary Cumulative Distribution Function (CCDF) using different M-ary signaling and found that with increasing M the order of M-ary signaling, the PAPR is reduced. The M-ary signal can be achieved by converting the signal of message from Binary to Non-binary by inserting a block, meant for the purpose, before Baseband Modulation of the signal, Comparison of 8-Differential Pulse Shift Keying (8-Dpsk), 8-Quadrature Amplitude Modulation (8-Qam), 8-Pulse Amplitude Modulation (8-Pam) and 8-Pulse Shift keying (8-Psk) shows that 8-Psk Baseband modulation schemes delivers good performance in terms of PAPR Localized subcarrier mapping is considered throughout this paper.