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Simulation of QPSK modulation and demodulation based on matblab
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QPSK modulation full name is quadrature phase shift keying, which means quadrature phase shift keying, is a digital modulation. Because of its high bandwidth utilization and strong anti-jamming performance, it has become a very important modulation and demodulation method in modern communication technology. On the basis of introducing the principles of different digital modulation methods, this paper uses MATLAB programming language and Simulink to realize the simulation design of QPSK system. The waveforms of each link in the process of modulation and demodulation are observed through the simulation graphics. Combined with the principle of QPSK modulation technology, the performance of the system is analyzed, and the feasibility of the simulation model is proved. Finally, the simulation design of the system through ideal channel, through Gaussian channel, first through Gaussian white channel and then through Rayleigh fading channel is further realized, and the system performance under different conditions is compared and analyzed. The results are basically consistent with the theory, which provides an effective reference for understanding the performance of QPSK system and the design of the system for practical application.
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Pi / 4dqpsk modulation, FPGA implementation
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This is a pi / 4dqpsk modulation code, using FPGA implementation, using Verilog language, using the Altera platform, the code contains the simulation file, the final simulation, get the correct pi / 4dqpsk waveform, observe the waveform, the signal has the correct phase jump
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QPSK modulation and demodulation simulation, Simulink
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This is a QPSK modulation and demodulation simulation project file, using the Simulink tool platform in MATLAB to build the whole adjustment and demodulation system. After testing, it can correctly demodulate the modulated signal and get the baseband signal. The bit error rate is about 0.0003%, which has good reference value
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