低速率毫米波通信數(shù)據(jù)鏈研究與驗證
[Abstract]:Data link is a data communication link system which is used to transmit and process tactical information on a variety of combat platforms on the information-based battlefield. Data link plays a more and more important role in modern communication system, and has been developed rapidly. At present, the research contents of data link include high-speed information transmission, low delay, large capacity, anti-interference and high confidentiality and so on. Based on the existing tactical data link technology, the physical layer technology of low-rate millimeter-wave communication digital link is studied in this paper. Based on the analysis of the overall design objectives of the low-rate millimeter-wave communication data link, a communication link physical layer transmission scheme with bandwidth of 1MHz, longest communication distance of 220km, bit error rate of less than 10km and communication rate supporting 500bps is designed. The emphasis of physical layer design mainly includes the following two aspects. Firstly, aiming at the problem that the clock frequency is limited by FPGA Field-Programmable Gate Ar (ray, field programmable gate array (FPGA) in the up-and-down converter module, a multi-phase digital filtering method is proposed. When the FPGA clock frequency is 250MHz, the digital signal is interpolated from the 300Msps sampling rate to the 2.4Gsps sampling rate in a multiphase manner (the reverse is the reverse when decimated). Second, in the design of carrier synchronization module, the frequency offset estimation based on fast Fourier transform and phase locked loop carrier synchronization are simulated respectively. The results show that when the signal-to-noise ratio is-16dB and the Doppler frequency shift is 90kHz, the bit error rate of phase-locked loop carrier synchronization scheme can reach the requirement target in the AWGN channel, and the signal-to-noise ratio is-16dB and the Doppler frequency shift is 90kHz. However, the frequency offset estimation scheme based on Fast Fourier transform (FFT) can not meet the bit error rate (BER). After the implementation of the low-rate millimeter-wave communication data link, the site test is carried out, including bit error rate test, phase-locked loop carrier synchronization error test, and the test results are used to verify the feasibility of the design.
【學(xué)位授予單位】:電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TN919.2
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