Design And Implement Of SNCK Communication System Based On The Noncoherent Demodulation

As the public transport speed increased and the high-speed vehicle, people demand more and more high quality of communication under the high speed motion state. So, It produces many new wireless communication mode and advanced communication signal processing technique to suppress the Doppler frequency shift caused by high dynamic scene. Compared to the monochromatic wave modulation technology, nonmonochromatic wave modulation technology concerned by researchers with its strong ability against Doppler frequency shift.In this paper,a new noncoherent demodulation technology of Sine Non-linear Chirp Keying (SNCK) is introduced, by analyzing the feature of SNCK and analyzed the performance of SNCK noncoherent communication system with MATLAB. And, the performance of SNCK noncoherent communication system is verified by the hardware platform.The main research contents of this thesis are as follows:First of all,the principle of SNCK modulation technology is introduced in this paper. It analysis the difference between the coherent demodulation and the noncoherent demodulation,verifies BER performance of the SNCK with in the Gauss white noise channel, researchs the noncoherent demodulation theory and the Doppler effect in the channel model, analysis its Doppler frequency shift ability of the noncoherent demodulation.Secondly, the SNCK noncoherent demodulation system simulation software is constructed. It analysis the SNCK source, the Gauss white noise channel and the Doppler shift channel model, orthogonal Digital Down Converter, the CORDIC frequency discrimination method, the sample sentence, analysis the BER performance of the SNCK each module.Finally, the noncoherent demodulation SNCK communication system based on FPGA hardware implementation platform is build. It verifies the noncoherent demodulation SNCK system feasibility and effectiveness from the perspective of hardware implementation and test validation, proves SNCK noncoherent demodulation technology of engineering practical value.