COMPARISON OF PERFORMANCES BETWEEN SC-FDMA AND OFDMA SYSTEMS UNDER DIFFERENT SUBCARRIER MAPPING SCHEMES

To improve the uplink performance of wireless network for long term evolution (LTE) single carrier frequency division multiple access (SC-FDMA) and orthogonal (OFDMA) are used. Two major concerns these SC-FDMA OFDMA high peak-to-average power ratio (PAPR) efficient subcarrier mapping scheme. This paper presents a comparison under different schemes which includes localized FDMA (LFDMA), distributed (DFDMA) interleaved (IFDMA). Quadrature amplitude modulation (QAM) with constellation sizes is The symbol error rate (SER) in minimized using appropriate PAPR less compared to OFDMA. IFDMA shows better reduction Compared OFDMA, 8-QAM IFDMA, reduced by 78%, 16-QAM 80%, 64-QAM 68%.