Verification Of Interference Suppression Algorithm For Aviation Data Link Based On Software Radio

L-band digital aeronautical communication system 1(L-DACS1)is proposed by Federal Aviation Administration(FAA)and European Organization for the Safety of Air Navigation(EUROCONTROL)to provide services for future aviation data communication and navigation.L-DACS1 uses orthogonal frequency division multiplexing(OFDM)multicarrier transmissions technology.L-DACS1 has broad application prospects in the field of aeronautical mobile communications because it has high spectrum utilization,high transmission capacity and strong anti-interference performance.L-DACS1 is deployed between distance measuring equipment(DME)channels in L-band,and its spectrum partially overlap with DME spectrum,DME signal will seriously deteriorate the performance of OFDM receiver of L-DACS1.So it is of great significance to carry out pulse interference suppression and signal demodulation technology of OFDM receiver.In this paper,the forward link prototype system of L-DACS1 is built by using software radio platform,and the effectiveness of DME interference suppression algorithms are verified.The main research contents of this paper are as follows:Firstly,on the basis of learning the forward link super-frame structure and the physical layer protocol of L-DACS1,the prototype construction of L-DACS1 forward link transmitter and receiver is designed and realized by MATLAB;on this basis,the forward link transmitter and receiver of L-DACS1 are designed and realized by Yun SDR320 software radio platform,and conduct joint debugging tests.Secondly,the DME interference signal is added,and three DME interference suppression algorithms pulse blanking,pulse clipping and compressed sensing convex are theoretically analyzed,and floating-point algorithm simulation is performed on the prototype system of the forward link transmitter and receiver of L-DACS1.Finally,the algorithm verification platform is built by Y320,and the effectiveness of the three DME interference suppression algorithms pulse blanking,pulse clipping and compressed sensing convex are verified,and compared with the theoretical simulation results.