Analogue adaptive gain control method applied to multi-band orthogonal frequency division multiplexing (MB-OFDM) system

The invention provides an analogue adaptive gain control method applied to a multi-band orthogonal frequency division multiplexing (MB-OFDM) system. The method comprises the following steps of: receiving a signal; executing transient desaturation operation on the received signal in a first time period to separate the signal from a saturation region; and executing transient capturing operation after the first time period to lock a receiving gain to be set, wherein the synchronous information of the system is not used for the transient desaturation operation and the transient capturing operation. By the method, the performance of a receiver of a wireless communication system can be greatly optimized.