Patent ID: 7519127

Claim:
A wireless transmission device which communicates with a wireless reception device, comprising: a transmission-signal-generating unit configured to generate a plurality of transmission signals, respective transmission rates thereof being different transmission rates that are determined in accordance with combinations of coding rates and modulation schemes; a controller configured to assign a plurality of different preamble signals to the plurality of transmission signals, respectively, according to ranks of the plurality of transmission signals arranged in order corresponding to the different transmission rates, the different preamble signals corresponding to the ranks, respectively, and being used for an estimation of channel responses at the wireless reception device; a preamble adder which adds, to each transmission signal of the plurality of transmission signals, one of the different preamble signals that corresponds to a rank of the transmission signal; and a plurality of transmission units configured to transmit the plurality of transmission signals with the preamble signals added thereto, the plurality of transmission units including respective transmission antennas.