Research Of Pulse Interference Mitigation Based On BICM-ID

In order to meet the requirements of future aeronautical communication systems,L-band Digital Aeronautical Communications System 1 came into being.The system is a multi-application cellular broadband system that can provide a variety of air traffic services(ATS)and air operations control(AOC)communications services at the same time.Since the L-band has been exploited by other systems such as DME,idle spectral resources are scarce and difficult to allocate.In order to make reasonable use of the existing spectrum resources,L-DACS1 was deployed as an inlay system in the spectral gaps between two adjacent channels of Distance Measure Equipment(DME).To mitigate the deleterious influence of DME interference on OFDM receiver of L-DACS1 system,DME pulse interference suppression research have been carried out based on BICM-ID,the main research contents of this paper are as follows:Firstly,the problem of DME interference affecting the OFDM receiver of L-DACS1 system is studied.Firstly,the specific spectrum distribution of the aeronautical radio navigation is given.Secondly,the DME signal is used to analyze the receiver interference of the L-DACS1 system: the DME signal interference power is calculated and the closed expression is given.Finally,the computer simulation shows that interference from DME will seriously deteriorate the reliability of the L-DACS1 system transmission link.Secondly,a BICM-ID pulse interference suppression method based on compression sensing and ICI compensation is proposed.Firstly,the received signal is sent to the subcarrier interference compensation(ICI)branch and the compression sensing branch respectively.In the ICI branch,the ICI interference is generated for the ICI interference generated after the pulse is extinguished.The compensation process belongs to the iterative process.The softinformation from the ICI compensation branch is fed to the compression sensing pulse branch,and the soft information from the compressed sense branch decoder is sent to the ICI compensation branch.The iterative process enables the demodulator and the decoder to communicate information with each other,so that they can benefit from the information,which come from each other,and finally the improvement of the decoding performance is achieved.The simulation results show that the BICM-ID interference cancellation scheme based on combined compression sensing and ICI compensation can effectively suppress the DME pulse interference,thus improving the reliability of system link transmission.