LAUSR

Abstract 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 × 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.