A method of decoding a radio signal by an electronic device is provided. The method includes receiving the radio signal, digitizing the radio signal, auto-correlating the radio signal to generate a first signal and determining periodic information of the radio signal using the first signal. An electronic device, such as a software defined radio, is also provided. The electronic device includes a radio frequency front end, a processing unit and memory. The processing unit may also include a field programmable gate array and a graphics processing unit.