Abstract: In this paper, a FPGA (Field Programmable Gate Arrays) based modulator is proposed for DAPPM (Differential Amplitude Pulse Position Modulation) technique. The proposed modulator is designed on FPGA complier Quartus program. Moreover, the simulation results are obtained on modelsim altera program. Addition to FPGA-based modulator, a demodulator is designed on FPGA complier to estimate the data bits at the receiver side.