Adaptive modulation and coding method for mobile communication system

PURPOSE: A method for adaptively modulating and coding a mobile communication system is provided to adaptively cope with a changing channel environment, and to perform an AMC(Adaptive Modulation Coding) process and an STC(Space Time Coding) process in parallel, thereby stably transmitting data without deteriorating a data rate. CONSTITUTION: An 'a' step is performed as follows. If data is transmitted to an uplink by using an AMC and an STC, a receiving end analyzes an uplink channel environment. Parameters of the uplink channel environment analyzed in the receiving end are transmitted to transmit data to the uplink by applying an AMC plus STC method. A 'b' step is performed as follows. If the data is transmitted to a downlink by using the AMC and the STC, the receiving end analyzes a downlink channel environment. Parameters of the downlink channel environment analyzed in the receiving end are transmitted to transmit the data to the downlink by applying the AMC and the STC.