基于现场可编程门阵列的差分四相相移键控调制解调算法设计

Design of DQPSK modulation and demodulation algorithm based on FPGA

以软件无线电技术为基础,针对差分四相相移键控(DQPSK)调制解调系统设计了全新的算法,实现了现场可编程门阵列(FPGA)平台下的DQPSK全数字调制解调,并可通过软件编程进行电路升级.与传统DQPSK调制解调电路相比,不但缩减了印制电路板(PCB)的尺寸,而且可以在不改变电路的情况下升级调制解调算法,从而降低了硬件升级、算法调整的成本.以Intel的Quartus II软件作为验证平台,用Verilog HDL语言实现了各个模块功能的设计,采用ModelSim软件进行功能仿真,验证算法的正确性.系统运行频率达到132 MHz,达到了预期要求.

Based on software radio technology,this paper designs a new algorithm for differential quadrature reference phase shift keying (DQPSK) modulation and demodulation system,realizes DQPSK full digital modulation and demodulation on the platform of field programmable gate array (FPGA),and upgrades the circuit through software programming.Compared with traditional DQPSK modulation and demodulation circuit,it not only greatly reduces the size of printed circuit board(PCB),but also can change and upgrade the modulation and demodulation algorithm without changing the circuit,thus reducing the cost of hardware upgrade and algorithm adjustment.Intel’s Quartus II software is used as the verification platform,Verilog HDL language is used to realize the functional design of each module,and ModelSim software is used to carry out functional simulation to verify the correctness of the algorithm.The operating frequency of the system reaches 132 MHz,which satisfies the expected requirement.