Research On Radar-communication Integrared Signal Based On FBMC Technology

Radar and communication integration system is a system that can achieve communication and information interaction and target detection function at the same time.The integration of radar and communication system is not only beneficial to help two systems using the same set of electronic equipment and transfer information and detect target at the same time,saving space and cost,but also can effectively to maximize the utilization of spectrum resources.At present,research concentrate on the orthogonal frequency division multiplexing(OFDM)signal multiplexing to generate the multi-carrier signal based on the design of radar communication integration technology.Based on the analysis of the advantages and disadvantages of the signal As another multi-carrier technology,this paper puts forward the integrated signal based on FBMC-OQAM(Filter Bank-Offset Quadrature Amplitude Multicarrier Modulation),compared with OFDM signal,lacking of cyclic prefix can improve the frequency spectrum utilization rate of the symbol,and the outer band attenuation of FBMC-OQAM decreased significantly,which can enhance the ability of anti-interference.Therefore,the technology also has a good application prospect in the integrated waveform design of radar-communication.The main contributions of this article are as follows:(1)The feasibility research of the communication-radar integrated signal with the signal sharing method based on FBMC technology.Based on the analysis of the similarities and differences of the radar system and communication system,the unity of radar and communication are analyzed,the integration signal of radar-communication are analyzed with resolution performance and communication performance,the simulation results show that the ambiguity function of the signal-sharing method and radar communication integration signal based on the FBMC technology is an ideal thumbtack type.Besides,with the high performance of communication bit error rate,the research scheme is feasible.(2)The performance analysis of the communication-radar integrated signal with the signal sharing method based on FBMC technology.In order to explore the influence of communication information on the integrated detection performance,this paper analyzes the resolution of the integrated signal between different number of subcarriers and symbols of the signal.The simulation results show that increasing the number of subcarriers increases the fuzzy region of the ambiguity function graph can not improve the radar detection ability of the signal efficiently.(3)The performance analysis of the communication-radar integrated signal with the signal sharing method based on MS-FBMC technology.In fact,the performance of the radar communication integrated system based on multi-carrier technology can be easily affected by communication modulation information.When the integrated signal is correlated,the performance of radar will decrease dramatically.In order to reduce the impact of radar communication integration signal based on FBMC technology,this paper proposes a method of pre-modulation for communication of information,through the introduction of pseudo-random m sequence based signal,so that the different symbols of FBMC can obtain required cross-correlation and autocorrelation,thereby reducing the impact on ambiguity function of the integrated signal.The simulation results show that the radar detection performance of the MS-FBMC signal is high and the bit error rate of communication data is low during transmission.