An apparatus and method for allocating radio resources in a wireless communication system are provided, in which a channel variation detector detects channel variations of mobile stations (MSs) using channel information estimated from a sounding channel included in a received signal and a scheduler determines sounding channel allocation periods for the MSs and selects MSs to which the radio resources will be allocated according to the channel variations of the MSs.

 
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> Antenna matching measurement and amplification control

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