Device and method of feeding back channel information

A method of feeding back channel information, the method comprising:

• estimating downlink channels between a plurality of transmission antennas of a base station and at least one reception antenna of a terminal;
• selecting one of an analog feedback scheme and a digital feedback scheme;
• and
• providing, to the base station, feedback information or index information of a vector of the downlink channels, according to the selected scheme,
• wherein the feedback information is generated by manipulating estimates of the downlink channels using a plurality of spreading sequences in the analog feedback scheme, and the index information is determined based on the estimates of the downlink channels in a quantized vector space in the digital feedback scheme.

A method of recognizing channel information with respect to downlink channels between a plurality of transmission antennas of a base station and at least one reception antenna of each of at least one terminal, the method comprising:

• receiving feedback information provided by the at least one terminal;
• extracting channel information corresponding to each of the plurality of transmission antennas by processing the received feedback information using a plurality of spreading sequences;
• and
• recognizing the channel information with respect to the downlink channels based on the channel information corresponding to each of the plurality of transmission antennas.

A computer readable storage medium storing a program to feeding back channel information, comprising instructions to cause a computer to:

• estimate downlink channels between a plurality of transmission antennas of a base station and at least one reception antenna of a terminal;
• generate feedback information by manipulating estimates of the downlink channels using a plurality of spreading sequences;
• and
• provide the generated feedback information to the base station

A terminal comprising:

• a channel estimator to estimate downlink channels between a plurality transmission antennas of a base station and at least one reception antenna of the terminal;
• a feedback information generator to generate feedback information by manipulating estimates of the downlink channels using a plurality of spreading sequences;
• and
• a feedback information provider to provide the generated feedback information to the base station.

A base station recognizing channel information with respect to downlink channels between a plurality of transmission antennas of the base station and at least one reception antenna of each of at least one terminal, the base station comprising:

• a feedback information receiver to receive feedback information fed back from the at least one terminal;
• an antenna-channel information extractor to extract channel information corresponding to each of the plurality of transmission antennas by processing the received feedback information using a plurality of spreading sequences;
• and
• a channel information recognizer to recognize the channel information with respect to the downlink channels based on the channel information corresponding to each of the plurality of transmission antennas.