PAPR in the SC-FDMA system

1. What is PAPR in SC-FDMA?
2. Why SC-FDMA has lower PAPR?
3. What is SC-FDMA in telecom?
4. How does SC-FDMA work?

What is PAPR in SC-FDMA?

SC-FDMA has drawn great attention as an attractive alternative to OFDMA, especially in the uplink communications where lower peak-to-average power ratio (PAPR) greatly benefits the mobile terminal in terms of transmit power efficiency and reduced cost of the power amplifier.

Why SC-FDMA has lower PAPR?

SC-FDMA spreads the energy of one subcarrier over all subcarriers before the IFFT. This way spectral nulls in the channel is reduced with averaging. Hence, PAPR is reduced.

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.

How does SC-FDMA work?

In SC-FDMA, the user symbols are first pre-coded using a DFT matrix, which spreads each subcarrier in the frequency domain, and then mapped to subcarriers prior to the Inverse Fast Fourier Transform (IFFT) operation. In SC-FDMA, the subcarriers are transmitted sequentially instead of in parallel as in OFDMA.