Patent ID: 7130592

Claim:
A radio transmitting apparatus comprising: a transmitter that transmits the same or different information using a plurality of antennas; an acquirer that acquires a circumstance of a propagation path; and a controller that determines whether the acquired circumstance is a good circumstance, a poor circumstance, or an extremely poor circumstance, and in a case that the determined circumstance is the good circumstance, sets the same transmission frequency for said plurality of antennas and allows said transmitter to perform space multiplexing transmission in which different information is simultaneously transmitted from said plurality of antennas with the same transmission frequency, in a case that the determined circumstance is the poor circumstance but not the extremely poor circumstance, sets different transmission frequencies for said plurality of antennas and allows said transmitter to perform frecquency multiplexing transmission in which different information is simultaneously transmitted from said plurality of antennas with the different frequencies, and in a case that the determined circumstance is the extremely poor circumstance, sets the same transmission frequency or different transmission frequencies for said plurality of antennas and allows said transmitter to perform space diversity transmission of frequency diversity transmission in which the same information is simultaneously transmitted from said plurality of antennas with the same transmission frequency or the different transmission frequencies.