| 摘要 |
A parameter update method that is used for entropy coding and decoding of a conversion is disclosed. A syntax element indicating a conversion coefficient level is binarized by using a parameter. The parameter is updated or maintained based on a result obtained by comparing the size of the previous conversion coefficient with a certain threshold obtained on the basis of the previous parameter used for the inverse-binarization of the previous conversion coefficient level syntax element. The certain threshold is set to have a value proportional to the previous parameter and if the previous parameter is updated, the updated parameter has a value that gradually increases in comparison to the previous parameter. A parameter update method that is used for entropy coding and decoding of a conversion is disclosed. A syntax element indicating a conversion coefficient level is binarized by using a parameter. The parameter is updated or maintained based on a result obtained by comparing the size of the previous conversion coefficient with a certain threshold obtained on the basis of the previous parameter used for the inverse-binarization of the previous conversion coefficient level syntax element. The certain threshold is set to have a value proportional to the previous parameter and if the previous parameter is updated, the updated parameter has a value that gradually increases in comparison to the previous parameter. A method for downlink beamforming in a wireless access system and a device therefor are disclosed. Specifically, the method comprises the following steps: transmitting, by an eNB, a reference signal to a UE through only a first antenna set from among whole antennas; receiving, by the eNB, channel state information (CSI) for the first antenna set from the UE; and transmitting, by the eNB, beamforming a downlink channel by using a pre-coding matrix for the whole antennas, wherein CSI for a second antenna set by which the reference signal has not been transmitted from among the whole antennas is calculated using the CSI for the first antenna set. |
