Patent ID: 8325592

Claim:
A communication device for sending transmission signals for one or more mobile stations from multiple transmitting antennas, comprising: a scheduling unit configured to allocate one or more frequency resource blocks each having a predetermined bandwidth and including one or more subcarriers preferentially to each selected one of the mobile stations that is in a good channel condition; one or more delay setting units provided between the scheduling unit and the transmitting antennas and configured to set delay values for one or more signal paths leading to the transmitting antennas; and a delay value updating unit configured to repeatedly update the delay values to be set by the delay setting units, wherein the delay value updating unit is configured to randomly vary the delay values, wherein the delay values are generated from random numbers, the communication device further comprising: a monitoring unit configured to monitor throughput of the transmission signals; and a range calculation unit configured to calculate a range of the delay values with which the throughput becomes higher than a predetermined level; wherein the next set of the delay values are generated from the random numbers within the calculated range.