Table 2 Acronyms of the proposed IIM-CBF schemes and the corresponding scenarios

Multi-user MIMO downlink,$M_{\mathrm{T}}^{\left(\text{BS}\right)}=M_{\mathrm{R}}^{\left(\text{tot}\right)}$

Multi-user MIMO downlink,$M_{\mathrm{T}}^{\left(\text{BS}\right)}<M_{\mathrm{R}}^{\left(\text{tot}\right)}$

CoMP downlink