Study Of QPSK Modulation System Base On FPGA And Design Of Arithmetic

To meet today's digital communications methods, and enhance the reliability and validity of digital communications, Various broadband technologies such as QPSK modulation, QAM, OFDM, etc. came into being, access codes and correction of errors technologies are widely applied. Programmable ASIC have enabled the design and development of electronic systems compared with traditional means of a revolutionary change FPGA and CPLD programming provided by the system can be (ISP) capabilities, Hardware design can be made functional through the same as software development and programming to change. Enable electronic system design by changing the duration of the programmable ASIC to change the system configuration functions, greatly improving the electronic system design flexibility and overall capacity, and shorten development cycles, reduce design costs. The spread spectrum communication technology is highly anti-jamming performance, low-power density hidden transmission, the confidentiality of information transmission, such as arbitrary site features, In communications, ranging, positioning, control and many other fields have used its unique advantages, and widespread concern in the international community and the rapid development.1st chapter is the introduction, mainly is to the error correcting code and the wide frequency condition synopsis, as well as FPGA and QPSK application situation as well as present paper system structureThe 2nd chapter first part introduced the QPSK theory, the 2nd part carries on the explanation on the system principle, namely signaling system implementation principle after A/The D switch completes the mold/The number converts, the output signal sends in FPGA. Carries on the error correction code and the wide frequency code by FPGA to the signal. Passes through double D/ by the FPGA output digit signal A switch implementation number/The mold converts, output simulated signal. Signal after orthogonal modulator quadrature modulation output, implementation quadrature modulation.