Data transmission system for transmitting data via relay having multiple antennas

Abase station comprising:

• a preceding unit to precode base station data based on a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;
• a transmission unit to transmit the precoded base station data to the relay using the plurality of base station antennas;
• a receiving unit to receive, from the relay, relay data including mobile station data transmitted from the mobile station connected with the relay, and including the base station data;
• and
• a data extraction unit to remove the base station data from the relay data to extract the mobile station data.

A method of forwarding data, the method comprising:

• generating a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;
• generating a receiving vector including mobile station data received from the mobile station and base station data received from a base station, the base station data being precoded in the base station based on the first and second radio channel state matrixes;
• generating relay data including the mobile station data and the base station data based on the receiving vector and the second radio channel state matrix;
• and
• transmitting the relay data to the base station and the mobile station.

A method of receiving mobile station data, the method comprising:

• preceding base station data based on a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;
• transmitting the precoded base station data to the relay using the plurality of base station antennas;
• receiving, from the relay, relay data including mobile station data transmitted from the mobile station connected with the relay and the base station data;
• and
• extracting the base station data from the relay data to extract the mobile station data.

A computer-readable storage medium storing a program to perform a method of forwarding data, comprising instructions to cause a computer to:

• generate a first radio channel state matrix for a radio channel from a plurality of base station antennas to a plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to a mobile station connected with a relay;
• generate a receiving vector including mobile station data received from the mobile station and base station data received from a base station, the base station data being precoded in the base station based on the first and second radio channel state matrixes;
• generate relay data including the mobile station data and the base station data based on the receiving vector and the second radio channel state matrix;
• and
• transmit the relay data to the base station and the mobile station.

A mobile station receiving base station data from a base station having a plurality of base station antennas via a relay having a plurality of relay antennas, the mobile station comprising:

• a transmission unit to transmit mobile station data to the relay;
• a receiving unit to receive, from the relay, relay data including the mobile station data and the base station data transmitted from the base station;
• and
• a data extraction unit to eliminate the mobile station data from the relay data to extract the base station data,
• wherein the base station data is data precoded by the base station based on a first radio channel state matrix for a radio channel from the plurality of base station antennas to the plurality of relay antennas and a second radio channel state matrix for a radio channel from the plurality of relay antennas to the mobile station.