Holographic multiple-input multiple-output (HMIMO) technology, which uses spatially continuous surfaces for signal transmission and reception, is envisioned to be a promising solution for improving the data rate and coverage of wireless networks. In Parts I and II of this three-part tutorial on HMIMO communications, we provided an overview of channel modeling and highlighted the state-of-the-art in holographic beamforming. In this part, we will discuss the unique properties of HMIMO systems, highlighting the open challenges and opportunities that arise as the transceiver array apertures become denser and electromagnetically larger. Additionally, we explore the interplay between HMIMO and other emerging technologies in next-generation networks.

翻译：全息多输入多输出（HMIMO）技术通过空间连续表面进行信号发射与接收，被视作提升无线网络数据速率与覆盖范围的潜在解决方案。在本系列三部分教程的前两部分中，我们概述了信道建模的研究进展，并聚焦了全息波束赋形技术的前沿成果。本部分将探讨HMIMO系统的独特性质，重点阐述当收发阵列孔径日益密集且电磁尺寸增大时涌现的开放性挑战与机遇。此外，我们还将分析HMIMO与下一代网络中其他新兴技术之间的协同关系。