Millimeterwavesubterahertz Ultramassive Mimo Transmission Technology 1st Edition Zhen Gao by Zhen Gao, Ziwei Wan, Yikun Mei, Keke Ying, Kuiyu Wang instant download after payment.

After about forty years of leap forward, the mobile communications have greatly reshaped people’s life and promoted the development of our society. With the official commercialization of the fifth-generation (5G) technologies in the 2020s, the current mobile networks are basically able to keep up with the versatile demand
of users. However, the mobile communication paradigm have gradually expanded from the simple Internet to the Internet of Things (IoT), which requires a plethora of devices to connect, interact, and exchange data anywhere and anytime. Also, as The Times require, various novel concepts and applications, such as ultra-highdefinition
video, extended reality, holography, digital twin, Metaverse, and so on, have emerged. In order to meet these challenges, the global industry and government have started the research and exploration of the sixth-generation (6G) mobile communication technologies [1, 2]. As shown in Fig. 1.1, compared to the current 5G networks, the key performance indicators (KPIs) of the future 6G networks are expected to significantly increase. For instance, in 6G, the peak data rate, userexperienced data rate, spectral/energy efficiency, supportable mobility, connection
density have been improved by about 10–100 times compared to 5G. Fortunately, there are many advanced techniques which support the realization of such KPIs.
Specifically, high-frequency communications, such as millimeter-wave (mmWave) or terahertz (THz) communications, can provide adequate spectrum resources to meet the KPI requirements like peak data rate and user-experienced data rate [3, 4]; massive multiple-input multi-output (MIMO) and even ultra-massiveMIMOcan further improve the system spectral efficiency [3, 5]; hybrid beamforming technique is expected to trade off the system performance, hardware complexity and energy consumption [6]; the novel network architectures, such as space-air-ground integrated network (SAGIN), are able to enhance the coverage of