A software defined radio is a transmitter and receiver system that uses digital signal processing (DSP) for coding, decoding, modulating, and demodulating data. This project focused on a new method of in- phase and quadrature components synchronous sampling that based on software radio. It mainly uses the A software defined radio is a transmitter and receiver system that uses digital signal processing (DSP) for coding, decoding, modulating, and demodulating data. This project focuses on a new method of in- phase and quadrature components synchronous sampling that based on software radio It mainly uses the