A superheterodyne transmission scheme is adopted and analyzed in a 300 GHz wireless point-to-point link. This was realized using two different intermediate frequency (IF) systems. The first uses fast digital synthesis which provides an IF signal centered around a carrier frequency of 10 GHz. The second involves the usage of commercially available mixers, which work as direct up- and down-converters, to generate the IF input and output. The radio frequency components are based on millimeterwave monolithic integrated circuits at a center frequency of 300 GHz. Transmission experiments over distances up to 10 m are carried out. Data rates of up to 60 Gbps using the first IF option and up to 24 Gbps using the second IF option are achieved. Modulation formats up to 32QAM are successfully transmitted. The linearity of this link and of its components is analyzed in detail. Two local oscillators (LOs), a photonics-based source and a commercially available electronic source are employed and compared. This work validates the concept of superheterodyne architecture for integration in a beyond-5G network, supplying important guidelines that have to be taken into account in the design steps of a future wireless system.

中文翻译：

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用于超快太赫兹通信系统的超外差 300 GHz 无线链路

在300 GHz无线点对点链路中采用并分析了超外差传输方案。这是使用两个不同的中频 (IF) 系统实现的。第一种使用快速数字合成，提供以 10 GHz 载波频率为中心的 IF 信号。第二个涉及使用商用混频器，作为直接上变频器和下变频器，以产生中频输入和输出。射频组件基于中心频率为 300 GHz 的毫米波单片集成电路。进行了长达 10 m 距离的传输实验。使用第一个 IF 选项可实现高达 60 Gbps 的数据速率，使用第二个 IF 选项可实现高达 24 Gbps 的数据速率。成功传输高达 32QAM 的调制格式。详细分析了该链接及其组件的线性度。使用并比较了两个本地振荡器 (LO)、一个基于光子学的源和一个市售电子源。这项工作验证了超外差架构在超 5G 网络中集成的概念，提供了在未来无线系统的设计步骤中必须考虑的重要指南。