Method and system for transmitting and receiving signal

Disclosed is a method for transmitting and receiving a signal. The method comprises: performing square law transform processing on a signal to be transmitted; and performing digital-to-analog conversion processing on the signal after the square law transform processing and transmitting the signal. Also disclosed is a system for transmitting and receiving a signal. With the method and the system of the present invention, a peak-to-average power ratio (PAPR) of a communication signal can be effectively reduced, so as to effectively increase the efficiency and signal-to-noise ratio of a power amplifier (PA).