Adaptive control method for repeater-station output signals, and device and system of adaptive control method

Disclosed are an adaptive control method for repeater-station output signals, and a device and a system of the adaptive control method. The adaptive control method is achieved in a manner that, the quality of the repeater-station output signals is detected, a signal-quality characterization value is compared with a signal-quality threshold after signal-quality calculation, and the dynamic power control is carried out based on the comparison result. According to the invention, echo cancellation technology, signal-quality monitoring and adaptive power regulation are combined so as to ensure the maximal output power while the signal quality is higher than the signal-quality threshold, and the self-excitation of the repeater station is effectively prevented, thereby helping the widening of the coverage area of the repeater station, improving the coverage effect of the repeater station, and eventually enabling self-consistent operations between the repeater stations in the point adding network.