Patent ID: 7746802

Claim:
An apparatus for feedback of Channel State Information (CSI) in a wireless communication system performing channel estimation at a transmitter or a receiver by using a pilot channel, the apparatus comprising: a transmitter terminal transmitting a signal for CSI measurement using the pilot channel; and a receiver terminal receiving the signal for CSI measurement from the transmitter terminal, checking a channel state based on the received signal, compressing CSI data using a compression rate according to the channel state, and transmitting the compressed CSI data, wherein the receiver terminal includes a receiver for receiving data using a traffic channel from the transmitter terminal and for receiving the signal for CSI measurement using the pilot channel from the transmitter terminal, a CSI measurement unit for measuring CSI data representing the channel state using the pilot channel, and a CSI encoder for compressing the CSI data into CSI feedback channel frames, and wherein the CSI encoder includes arithmetic encoders for compressing the CSI data using arithmetic coding, frame sections for converting the compressed CSI data into the CSI feedback channel frames, and a selector for selecting a CSI feedback channel frame having a selected compression rate from among the CSI feedback channel frames.