A Dynamic Array Using Spatial Amplitude Modulation With an Asymmetric Wilkinson Power Divider for Secure Wireless Applications
A Dynamic Array Using Spatial Amplitude Modulation With an Asymmetric Wilkinson Power Divider for Secure Wireless Applications
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DOI：
10.1109/lawp.2023.3310911
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发表时间：
2023-12
影响因子：
4.2
通讯作者：
Jacob R. Randall;Amer Abu Arisheh;Jason M. Merlo;J. Nanzer
中科院分区：
文献类型：
--
作者：
Jacob R. Randall;Amer Abu Arisheh;Jason M. Merlo;J. Nanzer
提出了一种利用天线阵列动态实现定向调制的新方法。非对称开关馈电结构在双元阵列中实现，该阵列在所需方向上支持静态天线方向图，同时在其他角度添加足够的复杂调制以减轻信息传输。动态天线阵列馈电被校准为同相，通过不对称威尔金森分压器的设计，信号馈电幅度比约为6.15 $\pm$ 0.1 dB。该天线系统由使用双极双掷（DPDT）射频开关的双状态开关矩阵组成。通过仿真和实验验证了2.5 GHz双元贴片阵列的安全通信能力。该通信系统采用16次二次调幅单载波信号，以4mb /s的速率以伪随机比特序列传输48kb。使用3khz的开关速率控制DPDT开关。为了隔离相位动力学的影响，通信系统以33 dB的信噪比运行，从而向各个方向传输高功率。在期望的传输方向$\phi \leq |$ 13^{\circ}|$上显示了低误码率（BER），在该区域外具有更高的误码率。静态天线在所有方向上的误码率为0；因此，误码和窄的$\pm 13^{\circ}$信息波束宽度完全是由天线阵列动态引起的。这种定向调制技术的性能指标与以前的文献为读者进行了比较。考虑到窄带信号的设备和仪器对杂散信号和缓解的进一步见解，以验证该技术作为可行的“黑箱”系统实现。
A new method of obtaining directional modulation by implementing antenna array dynamics is proposed. An asymmetric switching feed structure is implemented in a two-element array that supports a static antenna pattern in a desired direction while adding sufficient complex modulation at other angles to mitigate the transfer of information. The dynamic antenna array feeds are calibrated to be in-phase, have a signal feed amplitude ratio of approximately 6.15 $\pm$ 0.1 dB through the design of an asymmetrical Wilkinson divider. The antenna system comprises of a two-state switching matrix using a double-pole double-throw (DPDT) RF switch. Secure communication capability is demonstrated in simulation and experiment by a 2.5 GHz two-element patch array. The communication system uses a 16-quadratic-amplitude modulation single-carrier signal transmitting 48 kb in a pseudorandom bit sequence at a rate of 4 Mb/s. The DPDT switch was controlled using a switching rate of 3 kHz. To isolate the effects of the phase dynamics, the communication system was operating at an signal-to-noise ratio of 33 dB, thus transmitting high power to all directions. A low bit error ratio (BER) of $ is demonstrated at the desired transmission direction $\phi \leq |13^{\circ }|$, with higher BER outside this region. A measurement of a static antenna yielded BER $=0$ in all directions; thus, the bit errors and narrow $\pm 13^{\circ }$ information beamwidth were due exclusively to the antenna array dynamics. Performance metrics of this directional modulation technique are compared against previous literature for the reader. Further insights to spurious signals and mitigation are taken into consideration for the equipment and instrumentation of a narrowband signal to validate the technique as a viable “black-box” system implementation.