Abstract
An array’s degree of freedom (DoF) determines the number of jamming incidents that can be managed and the antijamming performance. Conventional arrays can improve the DoF only by increasing the number of antennas. On the other hand, when the received signal is digitized, high-power jamming will reduce the number of bits used to represent the desired signal, further increasing the difficulty of back-end antijamming based on digital signal processing. In this paper, we propose a joint radio frequency (RF) front-end and digital back-end antijamming scheme based on a metasurface antenna array. The metasurface antennas can rapidly switch patterns when receiving signals, so that a single channel can be equivalent to multiple channels and increase the DoF. We use independent component analysis to estimate the channel and then optimize the array parameters under the minimum signal-to-jamming ratio constraint of each antenna. The proposed scheme works well under high-power jamming conditions by suppressing jamming at the RF front end and using a low-precision analog-to-digital converter. Simulation results show that the proposed scheme reduces the bit error rate of the received signals by one order of magnitude compared with the conventional array.
摘要
阵列自由度的大小决定了能够应对的干扰数量与抗干扰性能. 现有阵列只能通过增加天线数量提高自由度. 另一方面, 接收信号在进行数字化时, 大功率干扰将导致用于表示期望信号的模数转换器(ADC)量化位位数下降, 进一步提高后端基于数字信号处理的抗干扰难度. 本文提出一种基于超表面天线阵列的射频前端与数字后端联合抗干扰方案, 利用超表面天线快速可重构能力, 对同一信号切换不同方向图接收, 令单通道等效为多通道, 提高阵列自由度. 利用独立成分分析获得信道盲估计结果, 在天线最小信干比约束条件下对天线参数进行优化设计. 在高功率干扰条件下, 通过在射频前端抑制干扰, 采用较低位数的ADC, 阵列也能具有较好的抗干扰性能. 仿真结果表明, 本文所提方案相比于传统阵列, 令接收信号的误比特率降低了一个数量级.
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Data availability
The data that support the findings of this study are available from the first or corresponding author upon reasonable request.
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Yangming LOU and Liang JIN designed the research. Yangming LOU and Wenyu JIANG processed the data. Yangming LOU drafted the paper. Liang JIN helped organize the paper. Liang JIN and Shuaifang XIAO revised and finalized the paper.
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Yangming LOU, Liang JIN, Wenyu JIANG, and Shuaifang XIAO declare that they have no conflict of interest.
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Project supported by the National Natural Science Foundation of China (No. U22A2001) and the Program of Songshan Laboratory (included in the management of the Major Science and Technology Program of Henan Province), China (No. 221100211300-03)
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1 Blind signal separation and channel estimation based on ICA@@2 Optimum solution to problem (25)
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Lou, Y., Jin, L., Jiang, W. et al. Joint radio frequency front-end and digital back-end antijamming scheme based on a metasurface antenna array. Front Inform Technol Electron Eng 24, 1739–1751 (2023). https://doi.org/10.1631/FITEE.2300113
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DOI: https://doi.org/10.1631/FITEE.2300113