Patent ID: 8170512

Claim:
A wireless transmitter comprising: a plurality of transmission antennas; and a phase rotating unit which adds phase rotation to signals which are respectively input to the plurality of transmission antennas, wherein the phase rotating unit adds first phase rotation for controlling the maximum delay time between the plurality of transmission antennas and second phase rotation for controlling the phases of arbitrary antennas among the plurality of transmission antennas, wherein the wireless transmitter is used in a transmission system in which scheduling of users is performed on a per-chunk basis where a region defined in a frequency domain and in a time domain is divided into chunks in the frequency domain and in the time domain, and in the case in which the frequency bandwidth of the chunk is Fc, the phase rotating unit adds the first phase rotation so that the maximum delay time between the plurality of transmission antennas is set to either a predetermined first value which is smaller than 1/Fc or a predetermined second value which is larger than 1/Fc.