aling in the DMRS-UplinkConfig field of the PUSCH-Config structure. In the case of multi-antenna ports (two or four antenna ports), the DM-RS on each port is coded (CDM: Code Division Multiplex). In the frequency domain, two types of configuration are defined: - type 1 configuration: six subcarriers per RB and per antenna port at the location k = 4n + 2k '+ A, k' and A take the value 0 or 1; - type 2 configuration: four subcarriers per RB and per antenna port, with two contiguous REs at the location k = 6n + k '+ A. When the DM-RS associated with the PUSCH channel relies on the DFT-S-OFDM modulation, type 1 and type 2 configurations may apply. When the DM-RS associated with the PUSCH relies on the OFDM modulation, only the type 1 configuration applies. 132 NG-RAN and 5G-NR 4.6.1.3. The DM-RS signal associated with the PUCCH channel The physical DM-RS signal associated with the PUCCH channel is used for the estimation and synchronization of the physical PUCCH channel. The physical PUCCH supports five formats, numbered from 0 to 4. The characteristics of the DM-RS associated with the PUCCH are correlated to the format of the PUCCH. The DM-RS is associated with the PUCCH for formats 1, 2, 3 and 4. The DM-RS PUCCH signal generated corresponds to the following formula: l'pucch = w,(m).r = where W1 (m) is an orthogonal sequence applicable only for formats 1 and 2 of the physical PUCCH channel; it allows code multiplexing of several mobiles. (m) references the OFDM symbol number assigned to the physical DM-RS signal. The sequence is verified: - for formats 1, 3 and 4 by the CAZAC sequence - for format 2, by the following Gold sequence: c(n)=(x,(n+N)+x2(n+N))mod = (n+31)=(x,(n+3)+x,(n))mod = x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2 = At the start of each subframe, the initial value Cinit of the pseudo-random sequence is calculated from the following formula: The resource elements (k, 1) of the physical DM-RS are located on the time- frequency resources allocated to the PUCCH. 5G-NR Radio Interface - The Physical Laye