Technology of digital modulation plays a important role in digital communication system, the combination of digital communication technology and field-programmable gate array (FPGA) is a certainly trend. The principle of quadrature phase shift keying (QPSK) and binary phase shift keying (BPSK) modulation are introduced, the circuit are also realized based on FPGA. It is proved that QPSK has a higher frequency spectrum utilization compare with the BPSK through comparing the modulation circuit emulation oscillogram of QPSK and BPSK in the Quartus II.%数字调制技术在数字通信中占有非常重要的地位,数字通信技术与现场可编程门阵列(FPGA)的结合是现代通信系统发展的一个必然趋势.介绍了四进制相移键控(QPSK)和二进制相移键控(BPSK)调制原理,并基于FPGA实现QPSK和BPSK调制电路仿真.通过在QuartusⅡ环境下得到调制电路仿真波形进行对比,进而得出QPSK相对于BPSK频带利用率更高.
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