Precoding apparatus, program for precoding, and integrated circuit

A precoding apparatus that performs a preliminary process on transmission data transmitted from a wireless transmission apparatus including a plurality of antennas to at least one wireless reception apparatus, the precoding apparatus comprising:

• a linear filter generation unit that generates a linear filter on the basis of channel information between each antenna and the wireless reception apparatus;
• a signal conversion unit that expands perturbation term candidates of a perturbation vector to be added to a transmission data vector and a reference signal associated with the transmission data in a complex plane;
• and
• a perturbation vector search unit that searches for the perturbation vector to be added to the transmission data vector on the basis of the perturbation term candidates and the reference signal expanded in the complex plane,
• wherein a transmission signal vector is calculated by adding a found perturbation vector to the transmission data vector and multiplying the transmission data vector by the linear filter.

A precoding method for performing a preliminary process on transmission data transmitted from a wireless transmission apparatus including a plurality of antennas to at least one wireless reception apparatus, the method comprising the steps of:

• generating a linear filter on the basis of channel information between each antenna and the wireless reception apparatus;
• expanding perturbation term candidates of a perturbation vector to be added to a transmission data vector and a reference signal associated with the transmission data in a complex plane;
• searching for the perturbation vector to be added to the transmission data vector on the basis of the perturbation term candidates and the reference signal expanded in the complex plane;
• and
• calculating a transmission signal vector by adding a found perturbation vector to the transmission data vector and multiplying the transmission data vector by the linear filter.

An integrated circuit that is mounted on a wireless transmission apparatus including a plurality of antennas and that causes the wireless transmission apparatus to realize a precoding function for performing a preliminary process on transmission data transmitted to at least one wireless reception apparatus, the precoding function comprising:

• a function of generating a linear filter on the basis of channel information between each antenna and the wireless reception apparatus;
• a function of expanding perturbation term candidates of a perturbation vector to be added to a transmission data vector and a reference signal associated with the transmission data in a complex plane;
• a function of searching for the perturbation vector to be added to the transmission data vector on the basis of the perturbation term candidates and the reference signal expanded in the complex plane;
• and
• a function of calculating a transmission signal vector by adding a found perturbation vector to the transmission data vector and multiplying the transmission data vector by the linear filter.