This study is the first 4 1 DQPsK modem modulation system, part of the basic principles and design of each module, focusing on shaping filter and a direct digital frequency synthesizer (DireetoigitalFrequeneySynihesis, referred to as DDS), and to address all the key modules algorithm matlab design simulation to show simulation results. Second, the study of modulation and demodulation system demodulation part of the basic principles and design of each module, focusing on differential demodulation, digital down conversion and bit synchronization algorithm, but also for its various key module of the Matlab algorithm design and simulation. Then use the Matlab simulation of the entire system theory, reach a conclusion. On this basis, , Using ultra-high speed integrated circuit hardware description language (VeryHighspeedxntegatedeireuitHardware DescriptionLan that age, referred to as VHDL) in the Altera Corporation Quartusll7.0 development environment to design and implement the variou

_4_DQPSK调制解调关键技术研究及FPGA实现.nh

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