QPSK Modulator on FPGA

The paper presents the theoretical backgrounds of a QPSK Modulation. The QPSK Modulator is then simulated using Modelsim and Xilinx environment tool for FPGA design as well as implemented on a Spartan 6 LX9 FPGA. The modulator algorithm has been implemented on FPGA using the Verilg HDL language on Xilinx ISE 14.2. The local clock oscillator of the board is 50Mhz which corresponds with a period of 20ns. The frequency of the QPSK carrier is 31,250 kHz and because the QPSK symbol is made of two bits, the output frequency is 62,50kbps. The modulator has been designed and simulated and its performances were evaluated by measurements.

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