epresents the broadband properties of the RF channel and the matrix W2 a sub-band matrix of co-phasing between the beams. In the case of beamforming, the weighting vectors are calculated from the angle of incidence of the signal and according to the number of antenna elements: The radiating elements k=1 to 01 are uniformly spaced (ULA: Uniform Linear Antenna) by a distance dv. In the case of the codebook, the zenith angle can only take precise values (the codebook is limited in size). We will assume that the rotation value can only take values i/01 - i integer values between 0 and 01-1. The beam bandwidth and the number of lobes depend on the antenna configuration. Let (Ng,N1,N2) be the structure of the antenna. The antenna elements being composed of a cross-polar strand, the number of CSI-RS signals is 2Ng.N1.N2. In the case of the single panel, the value of Ng is equal to 1. The values (N1,N2) are transmitted to the mobile in an RRC message via the data structure CodebookConfig -> typel-SinglePanel-> nl-n2. In the case of the multi-panel, the value of Ng is equal to 1. The values (N1,N2) are transmitted to the mobile in an RRC message via the data structure CodebookConfig -> typel-MultiPanel-> ng-n1-n2. 180 NG-RAN and 5G-NR 0 (deg) Uniform Linear Array with varying array length Figure 6.14. The relationship between the number of lobes, the beamwidth and the number of radiating elements (Su and Chang (2015)) The matrix W1 is calculated from the product of a rotation matrix Rn(q) of factor q corresponding to the zenith angle Oetilt and the discrete Fourier transform TFD of a beam. The TFD is defined by the diagonal matrix D. Beam rotation is equivalent to oversampling the code word (see Discussion R1- 1612661 and references) by a factor of 0=01.02. For a 2D antenna, we denote by 01 the oversampling of N (horizontal direction) and O2 the oversampling of N2 (vertical direction). The code word is defined by: The coding is applied differently depending on the single- or multi-panel antenna architecture. 5G-NR Radio I