On the ground of the basic princple of 4G system, this aritcle is aimed to design the interface between RF and Baseband of B3C system which mainly includes three parts AGC, AFC and APC.
该基带——射频接口的核心包括自动增益控制（AGC），自动频偏控制（AFC）和自动功率控制（APC）的设计。
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