SC-FDMA Receiver Benefits in LTE

Benefits of SC-FDMA Receiver in LTE

  1. Low Peak-to-Average Power Ratio (PAPR):
    • SC-FDMA (Single-Carrier Frequency Division Multiple Access) exhibits a lower PAPR compared to other modulation schemes, reducing the demand for power amplifiers with high linearity.
  2. Improved Power Efficiency:
    • Lower PAPR contributes to improved power efficiency, making SC-FDMA well-suited for mobile devices with limited battery capacity.
  3. Mitigation of High Power Consumption:
    • SC-FDMA’s characteristics make it more energy-efficient, addressing power consumption challenges in the uplink transmission of LTE, particularly beneficial for mobile devices.
  4. Enhanced Spectral Efficiency:
    • SC-FDMA offers better spectral efficiency in the uplink, optimizing the utilization of available frequency bands and supporting increased data rates.
  5. Reduced Interference:
    • SC-FDMA exhibits lower sensitivity to frequency-selective fading, reducing interference and enhancing communication reliability in challenging radio environments.

DFT spreading of modulation symbols reduces PAPR

  • In OFDM, each modulation symbols “sees” a single 15 kHz subcarrier (flat channel)
  • In SC-FD-A, each modulation symbol “sees” a wider bandwidth (i.e. mx 180 KHz)
  • Equalization is required in the SC-FDMA receiver
DFT-spread OFDM (DFTS-OFDM) is a transmission scheme that can combine the desired properties discussed in the previous sections, i.e.:
• Small variations in the instantaneous power of the transmitted signal (‘singlecarrier’ property).
• Possibility for low-complexity high-quality equalization in the frequency domain.
• Possibility for FDMA with flexible bandwidth assignment.
Due to these properties, DFTS-OFDM has been selected as the uplink transmission scheme for LTE.
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