Algorithm 1 Multi-label generation process

Input:M initialized binary multi-label vectors ${\mathbf{b}}_k={[0,0,\cdots ,0]}^{\mathrm{T}}$, M pre-processed full channel matrixs ${\overline{\mathbf{H}}}_k\in {\mathbb{C}}^{N_R\times N_T}$ 1:Initialize $k=1$ 2:while$k\le M$do 3:    Generate ${\mathbf{S}}_k=\left\{{\mathbf{s}}_{k,1},{\mathbf{s}}_{k,2},\cdots ,{\mathbf{s}}_{k,\tau },\cdots ,{\mathbf{s}}_{k,\lambda }\right\}$ for ${\overline{\mathbf{H}}}_k\in {\mathbb{C}}^{N_R\times N_T}$ 4:    Calculate $C_{k,\tau }$ of ${\mathbf{H}}_{{\mathbf{s}}_{k,\tau }}\in {\mathbb{C}}^{N_R\times L_t}$ according to (4) and (5) 5:    Find ${\mathbf{s}}_{k,max}$ in ${\mathbf{S}}_k$ corresponding to $C_{k,max}$ and $max=\{1,\cdots ,\lambda \}$ 6:    Set the corresponding position in multi-label vector ${\mathbf{b}}_k$ to 1 according to ${\mathbf{s}}_{k,max}$ 7:     $k=k+1$ 8:end while

Output:M multi-labeled vectors