A Jamming-Resistant OAM Wireless Communication System Based on Reconfigurable Intelligent Surface
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摘要: 针对复杂电磁环境下的通信干扰挑战,为克服传统固定孔径天线难以实时重构波束和动态适应干扰环境的局限性,该文构建了一种基于可重构智能表面(RIS)的抗干扰OAM模式移位键控(OMSK)通信系统。首先建立了系统信道模型,推导了误码率与OAM模态纯度的解析关系,揭示了模态纯度是制约系统抗干扰性能的核心瓶颈,为RIS硬件的高纯度设计提供了理论依据。其次,设计了一款工作于5.1 GHz的2-bit双极化RIS,仿真证实其激发的各模态纯度均优于88%,实测纯度达74%以上。最后,搭建完整的OMSK无线通信原型系统,通过对照实验证实了OAM波束与平面波及不同模式间的强正交隔离特性,并基于多组模式跳变编码序列开展抗干扰通信测试。结果表明,在10 mW极低发射功率下,接收端RIS使系统丢包率从80%以上降至15%以下,等效EVM改善约10 dB,距离测试进一步量化了受波束发散制约的有效通信边界。上述结果表明,基于RIS的OMSK系统能够在低功率条件下实现可靠的无线通信。Abstract: To address communication interference in complex electromagnetic environments and overcome the limitations of traditional fixed-aperture antennas in terms of real-time beam reconfiguration and dynamic adaptation to jamming, this paper proposes an anti-jamming orbital angular momentum (OAM) mode shift keying (OMSK) communication system based on reconfigurable intelligent surfaces (RIS). First, a system channel model is established, and an analytical relationship between the bit error rate and OAM mode purity is derived. This analysis reveals that mode purity is the core bottleneck constraining the system’s anti-jamming performance, which provides a theoretical basis for the design of high-purity RIS hardware. Second, a 2-bit dual-polarized RIS operating at 5.1 GHz is designed. Simulations confirm that the purity of each excited mode exceeds 88%, whereas the measured purity exceeds 74%. Finally, a complete OMSK wireless communication prototype system is constructed. Comparative experiments verify the strong orthogonal isolation between OAM beams and plane waves as well as between different OAM modes. Anti-jamming communication tests are then conducted based on multiple mode-hopping coding sequences. The results show that at an extremely low transmission power of 10 mW, the receiver-side RIS reduces the system packet loss rate from over 80% to below 15%, with an equivalent error vector magnitude improvement of approximately 10 dB. Distance tests further quantify the effective communication boundary constrained by beam divergence. These results demonstrate that the RIS-based OMSK system can achieve reliable wireless communication under low-power conditions.
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表 1 单元结构参数
Table 1. Structural parameters of the proposed unit cell
结构参数 数值 结构参数 数值 α1 83° lpin 4.5 mm α2 80° sl1 5 mm α3 75° sl2 9 mm α4 83° Rs 6.3 mm wc1 4.1 mm h1 4 mm wc2 4 mm h2 2 mm wc3 2 mm wc4 1.8 mm dpin 1 mm 表 2 4种工作状态对应的PIN二极管通断情况
Table 2. PIN diode states for the four operating modes
PIN State 0 State 1 State 2 State 3 PIN1 on off on off PIN2 off on off off PIN3 off on off on PIN4 on off off off 相移值 0° –90° 180° 90° 注:on和off分别表示对应的PIN二极管导通和关断的状态。 表 3 核心实验参数设置
Table 3. Key experimental parameter settings
参数名称 设定数值 (Value) 空口中心频率 (RF Center Frequency) 5.1 GHz 基带中频频率 (Baseband IF) 2462 MHz (信道 11)系统射频带宽 (RF Bandwidth) 40 MHz (HT40 模式) 发射端极限功率 (Transmission Power) ≤ 10 mW 典型测试距离 (Typical Testing Distance) 500 mm 极限测试距离 (Maximum Testing Distance) 1000 mm发包速率 (Packet Rate) 5 frames/s 单帧有效载荷 (Payload Size) 4 Bytes -
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