Method for measuring received signal power

A method for measuring received signal power includes the following steps: determining N kind(s) of sampling rate(s) of an analog-to-digital converter (ADC) according to a conventional minimum sampling rate of a received signal; making the ADC sample the received signal according to the N kind(s) of sampling rate(s) within a sampling period and thereby obtaining sampled results; and measuring the received signal power according to the sampled results and the sampling period, wherein the conventional minimum sampling rate is corresponding to a signal cycle, the N is a positive integer, the N kind(s) of sampling rate(s) is/are corresponding to N kind(s) of sampling cycle(s), any of the N kind(s) of sampling cycle(s) and the signal cycle are coprime.