What does SC-FDMA stand for?
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Single-carrier
Single-carrier FDMA (SC-FDMA) is a frequency-division multiple access scheme. It is also called linearly precoded OFDMA (LP-OFDMA). Like other multiple access schemes (TDMA, FDMA, CDMA, OFDMA), it deals with the assignment of multiple users to a shared communication resource.
Does LTE use FDMA?
As a result, LTE uses a modulation scheme known as SC-FDMA – Single Carrier Frequency Division Multiplex which is a hybrid format.
Why SC-FDMA is used in uplink in LTE?
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 DL and SC-FDMA for UL?
This is useful for LTE since it makes possible to exploit frequency dependence scheduling. For instance, it would be possible to exploit the fact that user 1 might have a better radio link quality on some specific bandwidth area of the available bandwidth.
How does SC-FDMA differ from OFDMA?
The most obvious difference between the two schemes is that OFDMA transmits the four QPSK data symbols in parallel, one per subcarrier, while SC-FDMA transmits the four QPSK data symbols in series at four times the rate, with each data symbol occupying a wider M x 15 kHz bandwidth.
What are the differences between OFDMA and SC-FDMA?
From the figure it is imperative that OFDMA is multi-carrier system with one data symbol carried over by one subcarrier; while SC-FDMA is a single carrier system where in each qpsk symbol is carried by one much wider bandwidth subcarrier.
How OFDMA works in LTE?
To overcome the effect of multi path fading problem available in UMTS, LTE uses Orthogonal Frequency Division Multiplexing (OFDM) for the downlink – that is, from the base station to the terminal to transmit the data over many narrow band careers of 180 KHz each instead of spreading one signal over the complete 5MHz …
What are subcarriers in LTE?
A subcarrier is a secondary modulated signal frequency modulated into the main frequency (the carrier) to provide an additional channel of transmission. It allows for a single transmission to carry more than one separate signal.
What is FDMA in mobile communication?
FDMA (frequency division multiple access) is the division of the frequency band allocated for wireless cellular telephone communication into 30 channels, each of which can carry a voice conversation or, with digital service, carry digital data.
How does SC-FDMA differ from FDM?
What is UL DL MU-MIMO?
UL MU-MIMO is a new key feature introduced with Wi-Fi 6 (802.11ax). By leveraging UL MU-MIMO, multiple clients connected to the access point will be able to send acknowledgment responses (ack) simultaneously, thus saving airtime. This ultimately improves network throughput and efficiency.
What is single carrier FDMA (SC-FDMA)?
Single carrier FDMA (SC-FDMA) is a new multiple access scheme that is currently being adopted in 3GPP LTE uplink. SC-FDMA utilizes single carrier modulation and frequency domain equalization, and has similar performance and essentially the same overall complexity as those of OFDMA system.
What is SCSC-FDMA technology in LTE?
SC-FDMA is a new technology used for uplink in LTE. This white paper explores this technology, its use in LTE and its extension from OFDM. 5 Uplink Transmission The uplink transmission scheme is based on single-carrier FDMA, more specifically DFTS- OFDM.
Why SC-FDMA is called DFT-precoded OFDM?
Each data symbol is DFT transformed before mapping to subcarriers, hence the SC-FDMA is called DFT-precodedOFDM. In a standard OFDM, each data symbol is carried on a sep- arate subcarrier. In SC-FDMA, multiple subcarriers carry each data symbol due to mapping of the symbols’ frequency domain samples to subcarriers.
The LTE Single-Carrier Frequency Division Multiple Access (SC-FDMA) uplink incorporates Reference Signals (RSs) for data demodulation and channel sounding.