Patent ID: 8842743

Claim:
A communication device for communicating with N (N is an integer not smaller than 2) remote units, each remote unit including a plurality of antennas, wireless transmitting units for transmitting signals to a first user terminal through the antennas, and wireless receiving units for receiving signals from the first user terminal through the antennas, the communication device comprising: a transmission signal processing unit configured to output a transmission signal to be transmitted to the first user terminal; a received signal processing unit, to which received signals from the plurality of the wireless receiving units are combined and input through a plurality of paths as many as the number not larger than the number of the antennas provided on the remote units, the received signal processing unit specifying a remote unit subjected to interference by a second user terminal different from the first user terminal; and a switch configured to adjust a reception gain of each of the wireless receiving units, wherein the switch decreases the reception gain of the wireless receiving unit included in N−1 remote units out of the N remote units in a predetermined measurement section, and the received signal processing unit calculates a correlation value between the combined received signals and a reference signal transmitted by the second user terminal in the measurement section to judge that the remote unit of which reception gain is not decreased is subjected to the interference by the second user terminal when the correlation value is larger than a predetermined threshold.