Apparatus and method for compensating tx gain in wireless communication system

PURPOSE: An apparatus for correcting a transmission gain and method thereof are provided to control transmission gains according to the change of frequency and temperature in a transmission end unit. CONSTITUTION: A transmission power control apparatus creates correction values by using one or more control values provided from a transmission gain control apparatus and the change of frequency and temperature in a transmission end unit. The correction values are for correcting NCT(Nonlinear Compensate Table) control information. An NCT control apparatus(213) creates the NCT control information by using one or more control values provided from the transmission gain control apparatus. The NCT control apparatus corrects the NCT control information as the correction values provided from the transmission power control apparatus.