Patent ID: 8654714

Claim:
A base station including a plurality of antennas and communicating with a user device using the plurality of antennas in a system where a subframe is composed of multiple slots each composed of multiple basic time units, the base station comprising: a first mapping unit configured to map an L1/L2 control channel and a first reference signal used for demodulation of a first data channel within a predetermined number of basic time units from the beginning of each subframe, the L1/L2 control channel and the first reference signal being transmitted in a slot from a first antenna of the plurality of antennas; and a second mapping unit configured to map a second reference signal used for demodulation of a second data channel to a basic time unit following the predetermined number of basic time units within which the L1/L2 control channel and the first reference signal are mapped, the second reference signal being transmitted in the same slot from a second antenna of the plurality of antennas.