(
Single
Carrier-
Frequency
Division
Multiple
Access) SC-FDMA modulation combines the low peak-to-average power ratio (PAPR or PAR) of single carrier methods, such as GSM, with OFDM's resistance to multipath. For example, SC-FDMA is the uplink modulation in the LTE air interface, while the downlink uses OFDMA. See
OFDMA,
OFDM and
LTE architecture.