SC-FDMA for Multiuser Communication on the Downlink
Single-Carrier Frequency Division Multiple Access (SC-FDMA) has become a popular alternative to Orthogonal Frequency Division Multiple Access (OFDMA) in multiuser communication on the uplink. This is mainly due to the low Peak-to-Average Power Ratio (PAPR) of SC-FDMA compared to that of OFDMA. Long-Term Evolution (LTE) uses SC-FDMA on the uplink to exploit this PAPR advantage to reduce transmit power amplifier back-off in user terminals. In this paper, the authors show that SC-FDMA can be beneficially used for multiuser communication on the downlink as well. They present SC-FDMA transmit and receive signaling architectures for multiuser communication on the downlink.