Design and implement of BPSK modulator and demodulator based on modern DSP technology

This paper presents a method to design BPSK modulator and demodulator. The method makes use of modern DSP technology which uses the tool of DSP Builder of American Altera Co. The direct digital synthesis (DSP) principle is briefly presented and used to design orthogonal cosine signal module. In demodulator, we use the low pass FIR filtering IP core to filter high frequency component. The BPSK modem is ultimately implemented on the FPGA device. This design uses MATLAB/Simulink, DSP Builder 7.2, ModelSim 6.1g and Quartus II7.2 to simulate and realize directly BPSK modulator and demodulator based on FPGA, using DSP Builder to substitute the VHDL programming, has the organic integration in modeling and hardware implementation on the same work bench. The method can greatly improve the developing efficiency, shorten developing period and reduce costs. The practice has proved the accuracy and validity of the method.