Patent ID: 8036326

Claim:
An apparatus for cancelling interferences between signals, the apparatus comprising: a receiving unit that receives an orthogonal coded signal from a transmitter and generates a received vector; a channel estimation unit that estimates a state of a wireless channel from the transmitter to the apparatus where the cancelling of the interference between signals is performed and generates a channel state matrix; a Q-R decomposition unit that performs Q-R decomposition with respect to the generated channel state matrix and generates a Q matrix and an R matrix, and generates a decision statistic vector based on the generated Q matrix and the received vector; and a signal determination unit that determines a received signal with interference from the orthogonal coded signal being decreased based on the generated decision statistics vector, wherein the signal determination unit determines an interference contaminated received signal which includes interference between a plurality of signals being transmitted from a plurality of transmission antennas of the transmitter based on the determined decision statistics vector, and determines the received signal with interference being decreased from among the plurality of signals transmitted from the plurality of transmission antennas of the transmitter based on the determined interference contaminated received signal.