This work includes a proposed wireless AM system based on SDR using FPGA. The main units of this system are BPSK modem, QPSK modem , 8QAM modem , inserting pilot channel and SNR measurement channel. The backbone of AM is the real time measurement of the SNR in order to select the required AM technique . The measurement of SNR is required to separate the noise from receiving signals in order to find SNR. There are two techniques to separate noise from receiving signals either using the detected signal or by using pilot symbol assisted modulation (PSAM) technique.