Design And Implementation Of SC-FDE And OFDM Combined Transmission Scheme For Anti-Jamming Communication

There are higher requirements in the future information warfare for the performance of military communication system in anti-jamming,information rate,security and other aspects.Orthogonal Frequency Division Multiplexing(OFDM)system is a high-speed transmission system that can resist frequency-selective fading,which has incomparable advantages over single carrier transmission in spectrum shaping.Single Carrier-Frequency Domain Equalization(SC-FDE)system,which combines the advantages of single carrier technology and OFDM technology,is a very competitive scheme in high-speed wireless communication systems.This paper comprehensively considers the performance and advantages and disadvantages of the two communication systems SC-FDE and OFDM to combat the complex interference channel conditions in military communications.This paper designs and implements a SC-FDE and OFDM combined transmission scheme for anti-interference communication.In this paper,the simulation platform of OFDM and SC-FDE is built,and the multipath channel is mathematically modeled.The final system design scheme is determined by algorithm selection of the performance and implementation complexity of the system under each algorithm.For the narrowband interference situation,this paper uses OFDM technology as the traffic channel to select subcarriers to transmit business information,and uses SC-FDE technology as the control channel to transmit control information such as subcarrier scheduling,and the transmission protocol of control channel information is designed.In this paper,the pilot GHG sequence is designed and the synchronization capture performance is verified by the synchronization acquisition problem of the system with low SNR.Finally,the dual-system synchronization acquisition scheme is designed by using GHG sequence.This paper takes the simulation system design as the reference,adopts the top-down design method on the FPGA platform,builds the system framework and implements the RTL level of each functional module,and finally carries out the function simulation and resource analysis.In this paper,OFDM system is used to ensure high-speed interference-free data transmission,SC-FDE system is used to transmit control information such as subcarrier scheduling.At the same time,SC-FDE system is also used to capture the synchronization of the combined transmission system.The results show that this is an efficient transmission scheme.