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In this paper, the design and simulation of the QPSK transmitter using HDL code in MATLAB are presented. Different applications in DSP require mathematical modeling for investigation and analysis due to the complexity of HDL code language. The idea of design the HDL-SIMULINK form using MATLAB is to offer enough facility to modify and improve the wireless communication systems. Implementing any DSP model in real time based on FPGA platforms requires translating the MATLAB-SIMULINK model to HDL code before the bit generation is downloaded to this board. The floating-point implementation should be transferred to a fixed point for a high dynamic range of applications. An alternative approach has been proposed based on HDL code, and the property of simulation environments in MATLAB is designed. The data transfer, synchronization, and driving sample between Simulink and HDL language are explained in this paper.