Adaptive Transmission Device Using Limited Feedback Information in a Mobile Communication System, and a Method Thereof

A method for performing adaptive transmission by a base station by using feedback information transmitted from a terminal in a mobile communication system, the method comprising:

• a) receiving channel information and additional information generated by the terminal;
• b) using the channel information and the additional information to estimate a band to be used in the terminal, and allocating the band to each terminal;
• c) using the additional information to generate distance information between bands not allocated to the terminal and the band to be allocated to each terminal;
• d) using the distance information to estimate a channel value of the band not allocated to the terminal, and allocating the channel value to the terminal;
• and
• e) modulating traffic data according to the channel information allocated to the terminal, and transmitting the modulated traffic data.

A method for performing adaptive transmission by a base station by using feedback information transmitted from a terminal in a mobile communication system, the method comprising:

• a) receiving first feedback information including selected band channel location information and additional information from the terminal;
• b) using the channel location information and the additional information to estimate a band to be used in the terminal, and allocating the band to each terminal;
• c) transmitting allocated band information to the terminal, and receiving allocation band channel information corresponding to the band information as second feedback information from the terminal;
• and
• d) modulating traffic data according to the received allocation band channel information.

A terminal for transmitting feedback information to a base station to perform adaptive communication in a mobile communication system, the terminal comprising:

• a channel estimator for estimating channel information by using a pilot signal transmitted from the base station;
• a transmission band selector for selecting a band to be transmitted to the base station by using the channel information;
• a location information generator for generating channel location information on the selected band;
• and
• an additional channel information generator for generating additional channel information by using the channel information (the additional channel information is transmitted to estimate non-allocated bands in the base station).

A method for transmitting feedback information to a base station to perform adaptive communication by a terminal in a mobile communication system, the method comprising:

• a) receiving a pilot signal from the base station to generate channel information on bands;
• b) comparing the channel information on the bands to select a channel of a selected band to be transmitted to the base station;
• c) generating channel location information and additional channel information from the selected channel, and transmitting the channel location information and the additional channel information as first feedback information to the base station;
• d) receiving band allocation information on bands to be used from the base station;
• and
• e) generating allocation band channel information corresponding to the received band allocation information, and transmitting the allocation band channel information as second feedback information to the base station.