Apparatus and method for cooperative relay in a wireless communication system based on relay stations

A relay reception apparatus for cooperative relay in a multiple-antenna wireless communication system based on relay stations, the apparatus comprising:

• a first decoder configured to decode a common signal among a received signal that comprises a private signal and the common signal;
• and
• a second decoder configured to remove the decoded common signal from the received signal and decode the private signal,
• wherein the private signal is a signal encoded and modulated at a transmission rate at which a relay station performing the cooperative relay can perform decoding, and
• wherein the common signal is a signal encoded and modulated at a transmission rate at which all relay stations performing the cooperative relay can perform decoding.

A relay receive apparatus for cooperative relay in a multiple-antenna wireless communication system based on relay stations, the apparatus comprising:

• an encoder/modulator for configured to re-encode and re-modulate a decoded private signal and a common signal on the basis of a channel estimation;
• and
• a signal synthesizer configured to apply a parameter configured to control a multiplexing gain and a diversity gain to the re-encoded and re-modulated private signal and common signal, and the signal synthesizer also is configured to synthesize the two signals,
• wherein the private signal is a signal encoded and modulated at a transmission rate at which a relay station performing the cooperative relay can perform decoding, and
• wherein the common signal is a signal encoded and modulated at a transmission rate at which all relay stations performing the cooperative relay can commonly perform decoding.

A receive apparatus for cooperative relay in a multiple-antenna wireless communication system based on relay stations, the apparatus comprising:

• a first detector configured to receive a cooperative relay signal from a plurality of relay stations and detect a common signal in the cooperative relay signal on the basis of a corresponding channel estimation information;
• a first decoder configured to decode the detected common signal;
• an Nth detector configured to multiply the decoded common signal by a corresponding channel matrix and sequentially detect two or more private signals on the basis of the corresponding channel estimation information in a signal obtained by removing the detected common signal from the cooperative relay signal;
• and
• an Nth decoder configured to decode the two or more detected private signals.

A transmission method for cooperative relay in a multiple-antenna wireless communication system based on relay stations, the method comprising:

• dividing data into N number of streams;
• calculating a first transmission rate at which a relay performing the cooperative relay can perform decoding and a second transmission rate at which all relay stations performing the cooperative relay can perform decoding, and determining a transmission rate for each of the N-number streams;
• and
• encoding and modulating each of the N-number streams according to the first and second transmission rates.

A relay reception method for cooperative relay in a multiple-antenna wireless communication system based on relay stations, the method comprising:

• decoding a common signal from a received signal that comprises a private signal and the common signal;
• and
• removing the decoded common signal from the received signal and decoding the private signal,
• wherein the private signal is a signal encoded and modulated at a transmission rate at which a relay station performing the cooperative relay can perform decoding, and
• wherein the common signal is a signal encoded and modulated at a transmission rate at which all relay stations performing the cooperative relay can perform decoding.

A relay transmission method for cooperative relay in a multiple-antenna wireless communication system based on relay stations, the method comprising:

• re-encoding and re-modulating a decoded private signal and a common signal on the basis of a channel estimation;
• and
• applying a parameter for controlling a multiplexing gain and a diversity gain to the re-encoded and re-modulated private signal and common signal and synthesizing the two signals,
• wherein the private signal is a signal encoded and modulated at a transmission rate at which a relay station performing the cooperative relay can perform decoding, and
• wherein the common signal is a signal encoded and modulated at a transmission rate at which all relay stations performing the cooperative relay can perform decoding.

A reception method for cooperative relay in a multiple-antenna wireless communication system based on relay stations, the method comprising:

• receiving a cooperative relay signal from a plurality of relay stations and detecting a common signal in the cooperative relay signal on the basis of a corresponding channel estimation information;
• decoding the detected common signal;
• multiplying the decoded common signal by a corresponding channel matrix and sequentially detecting one or more private signals on the basis of the corresponding channel estimation information from a signal obtained by removing the common signal from the cooperative relay signal;
• and
• decoding the detected private signals.