Receiving apparatus and receiving method

A receiving method used in a receiving apparatus comprising:

• multiplying first and second receiving signal points corresponding to first and second receiving signals, respectively, received by first and second receiving antennas, respectively, by an inverse matrix of a channel matrix based on known signals included in the first and second receiving signals to generate converted first and second receiving signal points;
• first determining one or more first sending signal candidate points based on the converted first receiving signal point;
• second determining one or more second sending signal candidate points based on the converted second receiving signal point;
• and
• determining first and second sending signal points corresponding to first and second sending signals sent from first and second sending antennas in a sending apparatus, from among the first and second sending signal candidate points so that a total distance based on at least a first distance regarding the first sending signal point and a second distance regarding the second sending signal point satisfies a given condition.

A radio communication system comprising:

• a sending apparatus;
• and
• a receiving apparatus configured to,
• multiply first and second receiving signal points corresponding to first and second receiving signals, respectively, received by first and second receiving antennas, respectively, by an inverse matrix of a channel matrix based on known signals included in the first and second receiving signals to generate converted first and second receiving signal points;
• determine one or more first sending signal candidate points based on the converted first receiving signal point;
• determine one or more second sending signal candidate points based on the converted second receiving signal point;
• and
• determine first and second sending signal points, corresponding to first and second sending signals sent from first and second sending antennas in a sending apparatus, from among the first and second sending signal candidate points so that a total distance based on at least a first distance regarding the first sending signal point and a second distance regarding the second sending candidate point satisfies a given condition.