Method for receiving downlink signal in multi-antenna wireless communication system and device therefor

A method for receiving a downlink signal in a user equipment of a multi user MIMO (MU-MIMO) wireless communication system, the method comprising the steps of:

• receiving downlink control information (DCI) from a base station;
• acquiring information on logical antenna ports set in the user equipment and included in the downlink control information;
• receiving a user equipment specific reference signal based on the information on logical antenna ports;
• and
• receiving a downlink data signal based on the user equipment specific reference signal,
• wherein the information on logical antenna ports includes a minimum one of indexes of the logical antenna ports set in the user equipment and an offset value which is the number of logical antenna ports set continuously starting from the logical antenna port of the minimum index.

A user equipment in a multi user MIMO (MU-MIMO) wireless communication system, the user equipment comprising:

• a receiving module receiving downlink control information (DCI) from a base station;
• and
• a processor acquiring a parameter for a user equipment specific reference signal included in the downlink control information,
• wherein the receiving module receives the user equipment specific reference signal based on the parameter, and receives a downlink data signal based on the user equipment specific reference signal, and
• the parameter includes information on a rank which is set in the user equipment and information on logical antenna ports in which the user equipment specific reference signal is defined, and
• wherein the indexes of the logical antenna ports set in the user equipment are defined continuously, and the information on logical antenna ports is the minimum one of the indexes of the logical antenna ports set in the user equipment.

A user equipment in a multi user MIMO (MU-MIMO) wireless communication system, the user equipment comprising:

• a receiving module receiving downlink control information (DCI) from a base station;
• and
• a processor acquiring information on logical antenna ports set in the user equipment and included in the downlink control information,
• wherein the receiving module receives a user equipment specific reference signal based on the information on logical antenna ports, and receives a downlink data signal based on the user equipment specific reference signal, and
• the information on logical antenna ports includes a minimum one of indexes of the logical antenna ports set in the user equipment and an offset value which is the number of logical antenna ports set continuously starting from the logical antenna port of the minimum index.