Patent ID: 7983223

Claim:
A method of generating a Channel Quality Indicator (CQI) in a receiving apparatus of a wireless communication system, the method comprising: estimating a per-subband CQI with respect to each transport layer; generating a broadband CQI with respect to each transport layer according to the per-subband CQI; comparing the broadband CQI and the per-subband CQI with respect to each transport layer to determine a difference value thereof; determining an offset value to be used in a differential CQI; determining the differential CQI by subtracting the offset value from the determined difference value; and transmitting a transmission symbol by converting the determined differential CQI into the transmission symbol, wherein the determining of the offset value comprises adaptively determining the offset value by comparing a value indicating the number of times of performing encoding on a minimum differential CQI with a value indicating the number of times of performing encoding on a maximum differential CQI, and, if a difference thereof is greater than or equal to a threshold, adjusting the offset value by a preset value towards the larger value between the two compared values.