Device and method for transmitting and receiving data by a transmit diversity scheme using multiple antennas in a mobile communication system

In a mobile communication system having a transmitter comprising at least two antennas and adopting a transmit diversity scheme using multiple antennas, a feedback information generator useful for the transmit diversity scheme comprising:

• a channel characteristic meter for measuring channel characteristics using a received reference channel signal;
• a power calculator for calculating power of each of the preset number of weights based on the channel characteristics;
• a signal-to-interference-and-noise ratio (SINR) calculator for selecting from calculated powers of the present number of weights and calculating a signal-to-interference-and-noise ratio using weights having orthogonality with respect to a weight applied to the selected power;
• a maximum value selector for selecting the highest value of the signal-to-interference-and-noise ratios for the preset number of weights;
• and
• a feedback information transmitter for transmitting the selected highest signal-to-interference-and-noise-ratio and an index of the weight applied to the highest signal-to-interference-and-noise-ratio as feedback information.

A device for transmitting data by a transmit diversity scheme using multiple antennas in a mobile communication system having a transmitter comprising at least two antennas, said device comprising:

• a feedback information interpreter for interpreting feedback information received from a plurality of receivers and generating combinations including the highest signal-to-interference-and-noise-ratios of respective receivers and indices of the weights applied to the highest signal-to-interference-and-noise ratios;
• a categorize subset for categorizing the combinations by weights to correspond to the weight indices included in the combinations;
• a plurality of maximum value selectors, each for selecting a combination having the highest signal-to-interference-and-noise-ratio, among the combinations categorized by weights;
• an orthogonal combiner for generating orthogonal groups consisting of weights having orthogonality with respect to each other, among the weights applied to each selected combination having the highest signal-to-interference-and-noise-ratio, and highest signal-to-interference-and-noise-ratios corresponding to the orthogonal weights;
• a sum capacity calculator for calculating throughputs of respective orthogonal groups;
• and
• a maximum value selector for selecting the maximum value of the throughputs of the orthogonal groups and applying weight indices and receiver indices of an orthogonal group having the maximum throughput to data transmission.

A method for generating feedback information for use in a multiple antenna diversity scheme in a mobile communication system having a transmitter comprising at least two antennas and using a transmit diversity scheme, said method comprising the steps of:

• measuring channel characteristics based on a received reference channel signal;
• calculating power of each of the preset number of weights based on the channel characteristics;
• selecting from calculated powers of the present number of weights and calculating a signal-to-interference-and-noise ratio (SINR) using weights having orthogonality with respect to a weight applied to the selected weight power;
• selecting the highest value of the signal-to-interference-and-noise ratios for the preset number of weights;
• and
• transmitting the selected highest signal-to-interference-and-noise-ratio and an index of the weight applied to the selected highest signal-to-interference-and-noise-ratio as feedback information.

A method for transmitting data by a transmit diversity scheme using multiple antennas in a mobile communication system having a transmitter comprising at least two antennas, said method comprising the steps of:

• interpreting feedback information received from a plurality of receivers and generating combinations including highest signal-to-interference-and-noise-ratios (SINR) for the respective receivers and indices of the weights applied to the highest signal-to-interference-and-noise ratios;
• categorizing the combinations by weights to correspond to the weight indices included in the combinations;
• selecting a combination having the highest signal-to-interference-and-noise-ratio among the categorized combinations;
• generating orthogonal groups consisting of weights having orthogonality with respect to each other, among the weights applied to each selected combination having the highest signal-to-interference-and-noise-ratio, and highest signal-to-interference-and-noise-ratios corresponding to the orthogonal weights;
• calculating throughputs of respective orthogonal groups;
• and
• a maximum value selector for selecting the maximum value of the throughputs of the orthogonal groups and applying weight indices and receiver indices of an orthogonal group having the maximum throughput to data transmission.