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| Citation: | LI Wanlu, XIANG Zheng, and REN Peng. Filter bank multi-carrier waveform design for low probability of intercepting joint radar and communication system[J]. Journal of Radars, 2023, 12(2): 287–296. doi: 10.12000/JR22064
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Filter Bank Multi-carrier Waveform Design for Low Probability of Intercepting Joint Radar and Communication System
doi: 10.12000/JR22064
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Abstract
Cyclic prefixes in joint radar and communication systems based on Orthogonal Frequency Division Multiplexing (OFDM) and low probability of interception lead to weak radar echo masking on the battlefield. To address this problem, a low probability of interception waveform design scheme based on Filter Bank Multi-Carrier (FBMC) with Offset Quadrature Amplitude Modulation (FBMC-OQAM) is proposed in this paper. Mathematical models for the FBMC joint radar and communication waveform, target detection probability, and communication channel capacity are established. Under the radar and communication performance constraints required by the system, a joint optimization problem of minimizing the total transmitted power of the system is designed, and the subcarrier and power allocation scheme are optimized. Furthermore, the proposed algorithm can realize adaptive transmission where the parameters of the transmitting waveform can be optimally designed for the next pulse by utilizing the measured values of the current signal and the channel state information. Moreover, the feasibility and advantages of FBMC as the radar signal are analyzed based on the average ambiguity function. Theoretical analysis and simulation experiments show that the power allocation scheme proposed in this paper can effectively reduce the total transmitted power of the system, to achieve low interception performance compared with the equal power allocation. The FBMC waveform can effectively reduce the sidelobes caused by cyclic prefixes, which improves the radar resolution and information rate. -
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References
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- Figure 1. FBMC-OQAM signal model
- Figure 2. Radar detection probability versus non-central parameter
- Figure 3. AAF of OFDM waveform and its zero-Doppler and zero-delay cut
- Figure 4. AAF of CP-OFDM waveform and its zero-Doppler and zero-delay cut
- Figure 5. AAF of FBMC-OQAM waveform and its zero-Doppler and zero-delay cut
- Figure 6. Total power versus probability of detection in scenario I
- Figure 7. Total power versus probability of detection in scenario II
- Figure 8. Total power versus probability of detection in different scheme
- Figure 9. Total power versus channel capacity in different scheme