Transmission-Rate-Enhanced Waveform Design And Link Level Performance Evalution For Link16

Link16 data link has attracted much attention due to its capabilities of anti-jamming and high security.It is one of the world’s most mature and widely used data link systems.But the research on data link started late and the performance is relatively backward in China.Therefore,new types of safer and more reliable data link systems are urgent.This thesis takes Link16 data link as the research object.First of all,this thesis studies key technologies of the physical layer in the Link16,and designs a link-level simulation platform for Link16.The wireless channel models for maritime communications are built to study the bit error rate performance of Link16 in the high-mobility scenario in the ocean.In addition,improving military informationization needs more situational awareness information categories and faster transmission speed.The highest transmission rate of traditional Link16 is only 238 kbps,which is difficult to meet the transmission requirements of images and videos.So this thesis proposes a transmission-rate-enhanced waveform for Linkl 6,and studies the lowcomplexity algorithm of channel equalization.In order to improve the capability of anti-jamming,interference detection and interference suppression are also explored.Finally,this thesis realizes the traditional Link16 and transmission-rate-enhanced waveform transmission link based on the Universal Software Radio Peripheral.The main research contents and innovation points of this thesis include:(1)Design and performance evaluation of the link-level simulation platform for Link16.The key technologies of the physical layer of the Linkl6 are studied and a link-level simulation platform for Linkl6 is designed.Then wireless channel models for maritime communications are built to study the bit error rate performance of Link16 in the high-mobility scenario in the ocean.The model provides a research basis for the application and optimization design of the data link in the marine environment.(2)Design and performance analysis of transmission-rate-enhanced Link16 waveform.This thesis proposes a transmission-rate-enhanced waveform for Link16 based on Orthogonal Time Frequency Space,and QPSK modulation and Turbo code are combined with OTFS in the waveform to give significantly improved performance.In addition,this paper proposes a low-complexity equalizer based on 2-D deconvolution to improve the performances of OTFS.Simulation results indicate that the proposed equalization method has lower complexity and similar performance with the traditional equalizer.In order to improve the capability of anti-jamming,this thesis proposes a method of interference detection and interference suppression based on the dual threshold Forward Consecutive Mean Excision algorithm.Simulation results indicate that the transmission-rate-enhanced waveform using this algorithm has better capability of anti-jamming than the traditional Link16 data link.(3)USRP implementation and performance tests of Link16 data link.Based on the NI USRP-2932 hardware platform and the Lab VIEW graphical programming software platform,the Link 16 data link and the transmission-rate-enhanced waveform are realized,and the capability of real-time text information sending and receiving is tested in the data link system.In addition,the bit error performance of the traditional Link16 data link and the transmission-rate-enhanced waveform is tested.Overall,this thesis focuses on three parts.The bit error rate performance of the data link in the ocean wireless channel is firstly simulated and analyzed by building a link level simulation platform for Link16.Then,considering that traditional Link16 is difficult to meet the transmission requirements of images and videos,this thesis proposes a transmission-rate-enhanced waveform for Link16 and studies the lowcomplexity algorithm of channel equalization.In order to improve the capability of anti-jamming,technologies of interference detection and interference suppression are also explored.Finally,the data link based on the software defined radio platform is realized to verify the transmission performance.