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Digital modulation and demodulation techniques in a digital communication system has a very important position, FPGA has become today's electronic design applications market preferred one of the programmable logic device; not all fields FPGA nowhere in the scene. With advances in electronic technology, FPGA performance of the year in improving; making FPGA devices compared with other more competitive; digital communication technology and FPGA combination of modern communication systems development a natural trend. VHDL is a description of digital electronic systems in the language, It originated from the United States government's very high-speed integrated circuit (VHSIC) program. VHDL design process to meet the various needs; In this paper, using VHDL for FPGA modulation and demodulation system design. This paper introduces the ASK, FSK, QPSK modulation and demodulation in principle; Based on FPGA ASK, FSK, QPSK modulation and demodulation circuit. Using VHDL programming respectively to achieve ASK, FSK, QPSK modulation and demodulation; and the use of Altera Corporation to launch a complete integrated design environment QuartusII compile simulation; thus proving the correctness of the design. VHDL is a powerful language; Reader - friendly, easy to modify and found errors; Strong portability; low cost; Design and Technology has nothing to do n; transplantation; can be used for simulation of VHDL source code for functional simulation; But for beginners easily make mistakes, the algorithm needs to be constantly testing simulation certification.

The numeral makes a solution to adjust a technique to correspond by letter system occupancy in the numeral count for much get position, the FPGA has become an electronics design's application a head one of the programmable logic spare parts for choosing on the market nowadays;Each realm has no place to disappear FPGA figure.Because the electronics craft have to progress, the function of FPGA spare part year by year Be raising;Make the FPGA spare part compare with other spare parts to have a competition ability more;Technique and FPGA of the numeral correspondence's combining is modern correspondence the system develop of an inevitable trend.
The VHDL is 1 kind to describe numerical electronics system language, it derives from an American government very high-speed integrated circuit(VHSIC) plan.The VHDL language can satisfy various demand in the design process;The this text convenient VHDL carries on the design that the FPGA makes to adjust system with solution.
This text introduced ASK, FSK, QPSK to make to adjust with solution principle;Carry out ASK, FSK, QPSK to make to adjust electric circuit with solution according to the FPGA also.Use the VHDL language plait distance to carry out ASK, FSK, QPSK to make to adjust with solution respectively;The completely integrated design environment QuartusII which counteracts an Altera company to release carries on editing and translating to imitate really;Then prove this accuracy of[with] design.
The VHDL language has the function strong language structure;The readability is strong, being easy to modification and detection a mistake;Can transplant sex strong;The cost is low;Design to have nothing to do with the craft;The ASIC transplants;Can use to imitate a true machine to the VHDL source code carry on function to imitate really;But easily make mistake to the raw recruit, the calculate way needs to adjust to try to imitate to really take into an attestation continuously.