Simulation and Research of QPSK Modulation and Demodulation Technology
Both the block diagram of the overall scheme of the all-digital QPSK receiver and transmitter and the detailed design scheme of the synchronization system are given. The theoretical analysis and derivation of the loose tail ring carrier synchronization system module assisted by FFT, the main module of the Gardner bit synchronization system, and the main module of the Barker frame synchronization system are carried out, which lays a theoretical foundation for the realization of the whole system. The MATLAB simulation of each module of the system receiver and transmitter is carried out to extract the local carrier signal of the same frequency and phase, which successfully obtains the best sampling point, finds the frame head, and correctly restores the modulated signal, all verifying the rationality of the system designed in this paper.
QPSKFFT loose tail ringgardnerloose end ringgardner interpolationbarker code
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