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Hybrid Beamforming for Terahertz Wireless Communications with Beam Squint:A Survey

Chinese Journal of Electronics 2022年第6期31卷 1043-1052页

作者： WU Yezeng XIAO Lixia LIU Guanghua JIANG Tao Research Center of 6G Mobile Communications School of Cyber Science and EngineeringHuazhong University of Science and Technology Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology

Benefiting from the ultra-wide bandwidth, terahertz(THz) communication is considered one of the core technologies of the 6G mobile ***, high path loss is a severe issue for THz band,which needs to be solved by the ultra-massive multiple-input multiple-output(MIMO) technology. For the sake of reducing the hardware cost and power comsumption, the hybrid beamforming technology is required, which has been adopted in the 5G communication. In the hybrid beamforming for the THz wideband system, the enormous antenna and ultra-wide bandwidth cause the spatialand frequency-wideband effect, resulting in acute beam squint. Eliminating beam squint is the key to the engineering realization of ultra massive MIMO for the THz band. To circumvent this issue, this paper presents a comprehensive overview of the hybrid beamforming technology including the channel model, the traditional phase shifter based and the true time delay based architectures,the 3D hybrid beamforming for the uniform planar ***, multiple significant open issues and potential challenges are pointed out and elaborated.

关键词： power comsumption multiple significant open issues hybrid beamforming technology wireless channels core technologies ultra-massive multiple-input multiple-output hardware cost 5G mobile communication millimetre wave communication phase shifters ultra massive MIMO 6G mobile communication acute beam squint severe issue MIMO communication array signal processing terahertz wireless communications high path loss ultra-wide bandwidth cause spatial- frequency-wideband effect

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