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Table 1 List of main variables

From: MSE minimized joint transmission in coordinated multipoint systems with sparse feedback and constrained backhaul requirements

\({\varvec{H}}_{u}\) Channel matrix for the u-th user
\({\varvec{W}}_{u}\) Precoding matrix for the u-th user
\(\bar{{\varvec{H}}}_{u}\) Effective channel matrix for the u-th user
\(\tilde{{\varvec{H}}}_{u}\) Composite channel matrix for the u-th user
\(\hat{{\varvec{W}}}\) Sparse precoding matrix
\({\varvec{S}}\) Link selection matrix
\({\varvec{S}}^{b}\) Link selection sub-matrix for the b-th BS
\({\varvec{S}}_{u}\) Link selection sub-matrix for the u-th user
\({\mathrm{N}}_{b}\) Number of BSs
\({\mathrm{N}}_{t}\) Number of BS’s transmission antennas
\({\mathrm{N}}_{u}\) Number of users
\({\mathrm{N}}_{r}\) Number of user’s transmission antennas