Research On High Speed LPI Waveform Based On SC-FDE

Recently,with the rapid development of aircraft including UAV and airplane,the aviation industry has large requirements for high performance of aviation wireless broadband communication.The environment of aviation communication with large Doppler spread and serious multipath fading reduces the reliability of the ground to air communication transmission link and often interrupts in the process of data transmission.In the process of aviation communication,communication signals may be intercepted by the enemies and criminals,especially in military communication.The enemies and criminals intercept the ground to air communication signals and air to air communication signals through the process of discovery,identification and interpretation,which leads to information being obtained by enemy and lawbreaker and causing communication security problems and even threatening the safety of aircraft.Therefore,it is of great significance to study anti-interception broadband aviation communication for military aviation and civil aviation.The SC-FDE has the advantages of the high data rate and low PAPR(Peak to Average Power Ratio).The aviation broadband communication has a great demand for high rate transmission communication.The aviation communication is a communication system with limited power.The SC-FDE with low PAPR is more suitable for aviation communication than OFDM with high PAPR.This paper studies the anti-interception aviation broadband communication waveform based on SC-FDE.Matched filter,waveform detection,higher-order statistic and CAF(Cyclic autocorrelation function)are used for signal detection.In this paper,the CAF is used for signal detection because the CAF doesn’t need prior information.When we detect the cyclic feature of the traditional SC-FDE,the traditional SC-FDE is easily detected because of the same UW.The aircraft is dangerous.The key of research is to retain the anti-multipath ability of SC-FDE and enhance the anti-interception performance of SC-FDE.The result of the simulation is that the same UW is the reason that the SC-FDE is easily intercepted..From this characteristic of the SC-FDE,we designed the anti-interception SC-FDE with different UW.Aiming to the limited UW of the standard UW,we extend the UW based the Zadoff-Chu sequence through derivative and simulation.Compared with the conditional SC-FDE,the anti-interception SC-FDE has better anti-interception performance when the cyclic autocorrelation function(CAF)is used to detect the anti-interception performance.We should ensure that bit error rate of anti-interception SC-FDE is same as the bit error rate(BER)of conditional SC-FDE,so anti-interception SC-FDE also need the process of acquisition,channel estimation,interpolation,equalization.Aiming at acquisition,this paper develops the traditional acquisition method to adapt to anti-interception SC-FDE,and proposes two solutions to the synchronization problem that the UW of the transmitter and the receiver is different.This paper analyze the throughout of the anti-interception SC-FDE and give the derivative and conclusion.Comparing the traditional SC-FDE,anti-interception performance of the anti-interception SC-FDE in this paper is enhanced and the BER performance doesn’t decrease.The anti-interception SC-FDE is proper used in communication project to enhance the safety of the communication and aircraft.