These are the most relevant features of 5G radio access:
oSpacing between subcarriers:
▪Below the 6GHz band: 15 kHz, 30 kHz and 60 kHz.
▪Above the 6GHz band: 60 kHz, 120 kHz and 240 kHz.
oMinimum and maximum bandwidth:
▪Below the 6GHz band: 5 MHz /100 MHz
▪Above the 6GHz band: 50 MHz / 400 MHz
•Carrier aggregation: up to 16 carriers
oDL waveform: OFDM. OFDM with cyclic prefix (CP-OFDM).
oUL waveform: OFDM or SC-FDMA
▪OFDM focused on high throughput scenarios. OFDM with cyclic prefix (CP-OFDM), or OFDM with preprocessing (DFT-S-OFDM).
▪SC-FDMA focused for power-limited scenarios.
•Multiple Access: Orthogonal Multiple Access or Non-Orthogonal Multiple Access (NOMA). Pair transmission:
oPaired, with FDD.
oImpaired, with TDD.
o8 antenna ports for SU-MIMO
o16 antenna ports for MU-MIMO
•Channel coding schemes:
oLDPC coding (Data)
oPolar coding (Control)
oCP-OFDM (UL/DL): QPSK, 16QAM, 64QAM, 256QAM
oDFT-S-DFDM (UL): π/2-BPSK, QAM, 64QAM, 256QAM
•Possibility of using multiple directing beams of radiation: beamforming, when millimeter wave bands are used to compensate for the greater propagation loss in these bands.