Sub-array grouping the radio fading channel demodulator to provide beamforming and diversity gains using the adaptive array antenna, a receiving mobile communication system and method having the same are disclosed. The wireless fading channel demodulator, the sub-array by using an array antenna grouping adapted combining beamforming and diversity gain, and the interference of other users in a wireless terminal station that enters a fading channel environment, a different angle. Therefore, robust to fading and sub-can be obtained a high SINR by the beam forming properties could be obtained in each of the array of grouping an antenna, there is an effect to obtain a high SINR, even if the number of antennas is less than the number of the terminal station user . Such as the wireless fading channel demodulator, the base station or the terminal station can be used in any system for receiving a mobile communication information.
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