METHOD FOR DIFFERENTIALLY QUANTIZING CHANNEL INFORMATION IN MULTIPLE ANTENNA RADIO SYSTEM AND SYSTEM ADOPTING SAME

摘要

The present invention relates to a communication method for transmitting a signal to multiple user terminals using multiple antennas in a radio communication system, and particularly to a method for differentially quantizing channel information in a multiple antenna radio system and a system adopting the same, wherein the method comprises: a main codebook feedback step of quantizing the entire range of channel correlation information of a user terminal to create a main codebook, feeding a representative value index for the main codebook back to a base station, and forming multiple eigen-beams using the representative value index for the main codebook to transmit a data signal; and a sub-codebook feedback step of differentially quantizing only a part of region of the channel correlation information on the basis of the amount of change in the channel correlation information to generate a sub-codebook, feeding a representative value index for the sub-codebook back to the base station, and forming multiple eigen-beams using the representative value index for the sub-codebook to transmit a data signal. According to the present invention described above, the number of quantization bits is reduced without a decrease in the system capacity in a radio communication system using a multi-antenna technique, so that it is possible to provide a channel correlation information quantization method capable of reducing the amount of uplink feedback information or enhancing the performance of the system with the same number of quantization bits.