A method for transparent Multi-User Multiple Input Multiple Output, MU-MIMO, comprising: configuring, by a base station, Demodulation Reference Signal, DMRS, ports for coordinated transmission User Equipments, UEs, performing a transparent MU-MIMO transmission, dividing, by the base station, each Resource Block, RB, into M ∗ N Resource Elements, REs, and grouping the REs in each RB into a first DMRS symbol area, a second DMRS symbol area and a user data area, wherein M and N are natural numbers respectively; and mapping DMRS symbols and user data of each coordinated transmission UE onto each RB according to the total number of allocated DMRS ports and configurations of the configured DMRS ports; transmitting, by the base station, DMRS port information of an i th UE of the coordinated transmission UEs to the i th UE, wherein i is a natural number; wherein the mapping the DMRS symbols and the user data onto each RB comprises: when the number of DMRS ports allocated to the UEs is equal or below 2, mapping the DMRS symbols onto the first DMRS symbol area; mapping, by the base station, the user data of the i th UE onto the user data area and the second DMRS symbol area; and receiving, by the i th UE, DMRS symbols of the i th UE from the first DMRS symbol area and receiving the user data of the i th UE from the user data area and the second DMRS symbol area according to the DMRS port information of the i th UE and an assumed DMRS density which indicates only the first DMRS symbol area is occupied by DMRS symbols. configuring, by a base station, Demodulation Reference Signal, DMRS, ports for coordinated transmission User Equipments, UEs, performing a transparent MU-MIMO transmission, dividing, by the base station, each Resource Block, RB, into M ∗ N Resource Elements, REs, and grouping the REs in each RB into a first DMRS symbol area, a second DMRS symbol area and a user data area, wherein M and N are natural numbers respectively; and mapping DMRS symbols and user data of each coordinated transmission UE onto each RB according to the total number of allocated DMRS ports and configurations of the configured DMRS ports; transmitting, by the base station, DMRS port information of an i th UE of the coordinated transmission UEs to the i th UE, wherein i is a natural number; wherein the mapping the DMRS symbols and the user data onto each RB comprises: when the number of DMRS ports allocated to the UEs is equal or below 2, mapping the DMRS symbols onto the first DMRS symbol area; mapping, by the base station, the user data of the i th UE onto the user data area and the second DMRS symbol area; and receiving, by the i th UE, DMRS symbols of the i th UE from the first DMRS symbol area and receiving the user data of the i th UE from the user data area and the second DMRS symbol area according to the DMRS port information of the i th UE and an assumed DMRS density which indicates only the first DMRS symbol area is occupied by DMRS symbols. when the number of DMRS ports allocated to the UEs is equal or below 2, mapping the DMRS symbols onto the first DMRS symbol area; mapping, by the base station, the user data of the i th UE onto the user data area and the second DMRS symbol area; and receiving, by the i th UE, DMRS symbols of the i th UE from the first DMRS symbol area and receiving the user data of the i th UE from the user data area and the second DMRS symbol area according to the DMRS port information of the i th UE and an assumed DMRS density which indicates only the first DMRS symbol area is occupied by DMRS symbols.