Patent ID: 7508878

Claim:
A wireless communication apparatus, comprising: a first transmitting unit configured to transmit a known symbol using a plurality of subcarriers by using a plurality of antennas, each of the subcarriers being classified into one of a plurality of groups, at least one of the groups being set to a negative correlation group and each remaining group of the groups being set to a positive correlation group according to an information pattern of a plurality of different information patterns which corresponds to an information item to be notified to a receiver side among a plurality of information items, the information patterns corresponding to the information items, respectively, each information pattern defining which group to be set to the negative correlation group and which group to be set to the positive correlation group, wherein a phase of one of two adjacent subcarriers that are transmitted by the same antenna and belong to the negative correlation group is inverted, a phase of the other of the two adjacent subcarriers is noninverted, and both phases of two adjacent subcarriers that are transmitted by the same antenna and belong to the positive correlation group are noninverted; and a second transmitting unit configured to transmit data symbols by using the antennas after the known symbol is transmitted.