Ke Jun Chen, Chen Xiangyu, Tang Wankai, Chen Ming Zheng, Zhang Lei, Wang Li, Dai Jun Yan, Yang Jin, Zhang Jun Wei, Wu Lijie, Cheng Qiang, Jin Shi, Cui Tie Jun
State Key Laboratory of Millimeter Waves, Southeast University, Nanjing210096, China.
Institute of Electromagnetic Space, Southeast University, Nanjing210096,China.
Natl Sci Rev. 2022 Oct 18;9(11):nwac225. doi: 10.1093/nsr/nwac225. eCollection 2022 Nov.
In the past few years, wireless communications based on digital coding metasurfaces have gained research interest owing to their simplified architectures and low cost. However, in most of the metasurface-based wireless systems, a single-polarization scenario is used, limiting the channel capacities. To solve the problem, multiplexing methods have been adopted, but the system complexity is inevitably increased. Here, a space-frequency-polarization-division multiplexed wireless communication system is proposed using an anisotropic space-time-coding digital metasurface. By separately designing time-varying control voltage sequences for differently oriented varactor diodes integrated on the metasurface, we achieve frequency-polarization-division multiplexed modulations. By further introducing different time-delay gradients to the control voltage sequences in two polarization directions, we successfully obtain space-frequency-polarization-division multiplexed modulations to realize a wireless communication system with a new architecture. The new communication system is designed with compact dual-polarized meta-elements, and can improve channel capacity and space utilization. Experimental results demonstrate the high-performance and real-time transmission capability of the proposed communication system, confirming its potential application in multiple-user collaborative wireless communications.
在过去几年中，基于数字编码超表面的无线通信因其简化的架构和低成本而受到研究关注。然而，在大多数基于超表面的无线系统中，采用的是单极化场景，这限制了信道容量。为了解决这个问题，已经采用了复用方法，但系统复杂度不可避免地增加了。在此，提出了一种使用各向异性时空编码数字超表面的空频极化分复用无线通信系统。通过为集成在超表面上的不同取向变容二极管分别设计时变控制电压序列，我们实现了频极化分复用调制。通过进一步在两个极化方向的控制电压序列中引入不同的时延梯度，我们成功获得了空频极化分复用调制，以实现具有新架构的无线通信系统。新的通信系统采用紧凑的双极化元部件进行设计，能够提高信道容量和空间利用率。实验结果证明了所提出通信系统的高性能和实时传输能力，证实了其在多用户协作无线通信中的潜在应用。
