LTE Uplink Transmission Scheme
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The Long Term Evolution (LTE) standard requires an uplink transmission rate of up to 86 Mbps. In order to support such a high data rate and avoid the high Peak-to-Average Power Ratio (PAPR) disadvantage in Orthogonal-FDMA, Single Carrier Frequency Division Multiple Access(SC-FDMA) is used in the uplink communication in LTE cellular systems. In this paper an overview of LTE and the LTE uplink transmissions is given, especially the SC-FDMA technique. Additionally results from a PAPR analysis, comparing OFDMA and SC-FDMA using different subcarrier mapping schemes, are presented. Finally an adaptive hybrid subcarrier mapping scheme, a combination of localized and distributed mapping schemes, is proposed as a technique for reaching good transmission performance with low PAPR.