Radio communication method, user terminal, radio base station and radio communication system

A user terminal that carries out downlink communication with a radio base station, the user terminal comprising:

• a channel estimation section that estimates a channel state corresponding to each of at least one CSI process;
• a generating section that generates CSI based on the channel state corresponding to each of the at least one CSI process;
• and
• a transmission section that transmits the CSI, wherein
• each of the at least one CSI process is associated with a resource of a CSI-RS that is precoded with a precoding weight.

A radio base station that carries out downlink communication with a user terminal, the radio base station comprising:

• a generating section that maps at least one CSI-RS each precoded by a precoding weight, to a CSI-RS resource;
• a transmission section that transmits the at least one CSI-RS;
• and
• a receiving section that receives CSI corresponding to at least one CSI process associated with the CSI-RS resource.

A radio communication system comprising a user terminal and a radio base station that carries out downlink communication with the user terminal, the user terminal comprising:

• a channel estimation section that estimates a channel state corresponding to each of at least one CSI process;
• a generating section that generates CSI based on the channel state corresponding to each of the at least one CSI process;
• and
• a transmission section that transmits the CSI,
• wherein each of the at least one CSI process is associated with a resource of a CSI-RS that is precoded with a precoding weight.