A multiantenna communication system comprises a determining part (116) that calculates correlation values each between the channel characteristics of the resource blocks in an STBC (Space Time Block Code) and determines a combination pattern exhibiting the highest correlation; a connection distributing part (103) that maps, into a time domain, a frequency domain and a spatial domain, the STBC encoded transport data in accordance with the combination pattern determined by the determining part; a plurality of transmission antennas (107) for transmitting respective signals associated therewith; a plurality of reception antennas (108) for receiving the signals transmitted from the transmission antennas; and a connection multiplexing part (113) that extracts the signals, which belong to the same STBC, from the signals mapped into the time domain, frequency domain and spatial domain in accordance with the combination pattern determined by the determining part, and then combines the data blocks.
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