Comparison of PAPR Analysis for OFDMA and SC-FDMA in LTE Systems

Single carrier frequency division multiple access (SCFDMA), a modified form of Orthogonal FDMA (OFDMA), is a promising technique for high data rate uplink communications in future cellular systems. In order tosupport high data rate and avoid the high Peak-to-Average Power Ratio (PAPR), Single Carrier Frequency Division Multiple Access (SC-FDMA) is used in the LTE cellular systems. SCFDMA is currently a strong candidate for the uplink multiple access scheme in the Long Term Evolution of cellular systems under consideration by the Third Generation Partnership Project (3GPP). Among the possible subcarrier mapping approaches, we find that localized FDMA (LFDMA) with channel-dependent scheduling (CDS) results in higher throughput than interleaved FDMA (IFDMA). However, the PAPR performance of IFDMA is better than that of LFDMA. Additionally resultsfrom a PAPR analysis, comparing OFDMA and SC-FDMA usingdifferent subcarrier mapping schemes, are presented. Finally the paper proposed a technique for good transmission performance with low PAPR.