Howtosignalprocessing
SC-FDMA is preferred for LTE uplink mainly due to its advantage of having low peak-to-average power ratio (PAPR) during signal transmission. The performance of SC-FDMA depends on modulation scheme used for it.
- Why LTE uses OFDMA for downlink and SC-FDMA for uplink?
- What is a advantage of SC-FDMA?
- Why OFDMA is not used in uplink?
- What is SC-FDMA in telecom?
Why LTE uses OFDMA for downlink and SC-FDMA for uplink?
LTE uses a pre-coded version of OFDM called Single Carrier Frequency Division Multiple Access (SC-FDMA) in the uplink. This is to compensate for a drawback with normal OFDM, which has a very high Peak to Average Power Ratio (PAPR).
What is a advantage of SC-FDMA?
Owing to its inherent single carrier structure, a prominent advantage of SC-FDMA over OFDM and OFDMA is that its transmit signal has a lower peak-to-average power ratio (PAPR), resulting in relaxed design parameters in the transmit path of a subscriber unit.
Why OFDMA is not used in uplink?
OFDMA is used on the downling, but since it presents a high Peak-to-average Power Ratio it is not possible to use it on the uplink. For the uplink SC-FDMA will be used.
What is SC-FDMA in telecom?
A multiplexing technique similar to OFDMA but where the subcarriers assigned to each user must be contiguous, which reduces the processing power and battery requirements for mobile devices. See also OFDMA.
