ng of the propagation channel. The OFDM signal is used on the downlink as it allows multiple access capacities according to the OFDMA (Orthogonal Frequency Division Multiple Access) technique. The zero-padding technique makes it possible to reduce the PAPR (Power Average Power Ratio) and the power rejection on the neighboring bands. The PAPR represents the ratio of the maximum power of the OFDM signal to the average power in a bandwidth. The uplink transmission uses either the OFDM signal or the DFT-S-OFDM (Discrete Fourier Transform Spread OFDM) signal. The DFT-S-OFDM signal is derived from OFDM modulation using transform precoding and is applied over a wider frequency band than the OFDM signal. The multiplexing method used in uplink is either OFDMA or SC-FDMA (Single Carrier - FDMA). The advantage of the DFT-S-OFDM signal is the reduction in power consumption (by reducing the PAPR). On the other hand, the DFT-S-OFDM signal is less spectrally efficient than the OFDM signal. In addition, for modulation with reduced bandwidth, the OFDM signal has been proven to consume less energy than the DFT-S-OFDM signal. OFDMA and SC-FDMA access multiplexing allow time-frequency resources to be distributed among each user. Spatial Division Multiple Access (SDMA) multiplexing, also known as the Multi-User MIMO (MU-MIMO) transmission mode, allows simultaneous transmission on the same frequency bands, to multiple users. SDMA multiplexing requires the use of multiple antennas. From Release R.16, 5G-NR offers non-orthogonal access multiplexing (NOMA), for which the time-frequency resources of the same antenna are used simultaneously by several users. With NOMA, the receiver sets up an MUD (Multi-User Detection) architecture in order to remove interference from other users via the SIC (Successive Interference Cancellation) algorithm. After the SIC algorithm, each user can recover their own signal. 4.1.2. Frequency bands and multiplexing methods Two frequency ranges (FR) are defined: 5G-NR Radio Interface - The Physical Layer - the F