A wireless link working at 220-GHz band is proposed for point-to-point high-speed communication. The system is primarily composed of sub-terahertz transceivers and baseband data processing platforms. Subharmonic mixers based on Schottky diode are developed and measured with a double-sideband (DSB) noise temperature of lower than 1100 K from 205 GHz to 230 GHz. High-selectivity waveguide bandpass filters are designed to reject the image sideband noise from entering the receiver. Two 58-dBi Cassegrain antennas are used to compensate for the large energy losses contributed by free space path and atmospheric absorption. Besides, sub-THz amplifiers based on InP HEMT technology are developed to further increase the transmitting power. To improve spectrum efficiency, 16 quadrature amplitude modulation is adopted. Forward error correction is implemented by using Reed-Solomon codes to reinforce the reliability of signal transmission. An outdoor wireless link is finally established within 1.5 km, and a data rate of 10 Gbps is achieved in real-time mode with an EVM of 9.53% (BER $1.4\times {10}^{-9}$). For demonstration, uncompressed ultra-HD videos are successfully transmitted. Note that any auxiliary electronic testing and measurement equipment is not required while communicating. It is believed that this article provides an effective and practical solution for future long-distance high-speed communication.

建议在 220 GHz 频段工作的无线链路用于点对点高速通信。该系统主要由亚太赫兹收发器和基带数据处理平台组成。开发并测量了基于肖特基二极管的次谐波混频器，其双边带 (DSB) 噪声温度在 205 GHz 至 230 GHz 范围内低于 1100 K。高选择性波导带通滤波器旨在抑制图像边带噪声进入接收器。两个 58-dBi Cassegrain 天线用于补偿自由空间路径和大气吸收造成的大量能量损失。此外，还开发了基于 InP HEMT 技术的亚太赫兹放大器，以进一步提高发射功率。为了提高频谱效率，采用了16次正交幅度调制。前向纠错是通过使用 Reed-Solomon 码来实现的，以增强信号传输的可靠性。最终在1.5公里内建立室外无线链路，实时模式下实现10Gbps的数据速率，EVM为9.53%（BER$1.4\times {10}^{——9}$）。为了演示，未压缩的超高清视频已成功传输。请注意，通信时不需要任何辅助电子测试和测量设备。相信本文为未来的长距离高速通信提供了有效实用的解决方案。