Uplink and Downlink of LTE-Release 10 in Cellular Communications
In LTE-Advanced, Orthogonal Frequency Division Multiple Access (OFDMA) has been selected as the multiple access scheme for downlink and Single-Carrier Frequency Division Multiple Access (SC-FDMA) for uplink. OFDM is an attractive modulation technique in a cellular environment to combat frequency selective fading channels with a relatively low-complexity receiver. However, OFDM requires an expensive and inherently inefficient power amplifier in the transmitter due to the high Peak-to-Average Power Ratio (PAPR) of the multi-carrier signal. This paper, presents the main components of LTE-Advanced including the all the details of Uplink (SCFDMA) and Downlink (OFDMA). Also this paper clarifies the main reasons of using SC-FDMA in uplink and using OFDMA in downlink only, in order to obtain flexible mobile communication technology.