Method for measuring background noise of communication channel

A method for measuring background noise of a communication channel comprises the following steps: switching a communication device from a first frequency point to a second frequency point within a short inter-frame interval after the communication device sends data, the first frequency point being a frequency point used by the communication device in an original transmit-receive process, and the second frequency point being a frequency point of which background noise needs to be tested; opening a receiving path of the communication equipment for signal sampling; after the sampling is finished, switching the frequency point of the communication equipment back to the first frequency point, and continuing the original transceiving process; and calculating the energy of the sampled signal as background noise. According to the method, the characteristics of wireless communication are utilized, the frequency point of the communication equipment is switched to the frequency point where the background noise needs to