Patent ID: 8121227

Claim:
A receiving apparatus comprising: a receiving section that receives a plurality of modulated signals from a transmitting apparatus comprising a plurality of antennas, the plurality of modulated signals being mutually different modulated signals transmitted from the plurality of antennas respectively; a channel fluctuation estimation section that finds a channel estimate of each modulated signal; a QR decomposition section that calculates an upper triangular matrix by performing a QR decomposition of the channel estimate of each modulated signal, and generates a plurality of decomposed signal including at least a first decomposed signal and a second decomposed signal using the upper triangular matrix and the received signals, the first decomposed signal being a signal comprising a smallest number of modulated signals among the plurality of decomposed signals, and the second decomposed signal being a signal comprising modulated signals included in the first decomposed signal and other modulates signals; a partial bit determination section that determines a bit of a higher likelihood in the first decomposed signal, using the first decomposed signal and a first row of the upper triangular matrix corresponding to the first decomposed signal; a candidate signal point computation section that reduces candidate signal points of the second decomposed signal using the bit of the higher likelihood in the first decomposed signal, the second decomposed signal, and a second row of the upper triangular matrix corresponding to the second decomposed signal; and a candidate signal point decision section that finds a likelihood of each of a plurality of bits transmitted by the plurality of modulated signals, with respect to the reduced candidate signal points.