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Table 1 Mathematical notations
| Notation | Physical interpretation |
|---|---|
| K rb | Denotes the number of all available time-frequency RBs |
| K c , K d | Denote the number of CUEs or D2D pairs in a cell |
| N c , N d | Denote the number of CUEs in a CUE subcluster and the number of D2D pairs in a DUE subcluster |
| C i | Denotes the label of CUE in a CUE subcluster, where i varies from 1 to N c |
| D j | Denotes the label of D2D pairs in a DUE subcluster, where j varies from 1 to N d , and each D2D pair includes a D j − T x and D j − R x |
| \( {\mathbf{s}}_{C_i}^m,{\mathbf{s}}_{D_j}^m \) | Denote the transmitted signal transmitted at the m-th subcarrier, and the subscript indicates the source of the signal |
| \( {\mathbf{E}}_{C_i},{\mathbf{E}}_{D_j} \) | Denote the diagonal matrix of the multiantenna transmit power, where the subscript indicates the source of the signal |
| \( {\mathbf{H}}_{i,j}^m \) | Denotes the Rayleigh channel matrix from node j to node i over the m-th subcarrier, with 0 mean and unit variance |
| L i,j | Denotes the diagonal matrix of the path loss from node j to node i |
| r i,j | Denotes the distance between node j and node i |
| \( {\mathbf{n}}_{\mathrm{BS}}^m,{\mathbf{n}}_{D_j}^m \) | Denote the additive white Gaussian noise (AWGN) on the m-th subcarrier |
