Design of DQPSK modulation and demodulation algorithm based on FPGA

• Main Authors: WANG Chen, PAN Jianguo, ZHENG Zhendong, WANG Fang
• Format: Article
• Language: English
• Published: Academic Journals Center of Shanghai Normal University 2019-08-01
• Series: Journal of Shanghai Normal University (Natural Sciences)
• Subjects: differential quadrature reference phase shift keying (dqpsk); modulation and demodulation; field programmable gate array (fpga)
• Online Access: http://qktg.shnu.edu.cn/zrb/shsfqkszrb/ch/reader/view_abstract.aspx?file_no=20190404

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.