通感一体去蜂窝超大规模MIMO与高频段无线接入技术

Cell-Free Ultra-massive MIMO and High-Frequency Band Wireless Access Technology for Integrated Sensing and Communication

随着全息类通信、数字孪生、虚实空间融合互动等新兴应用的快速涌现,未来移动通信系统需要能够支持超大容量无线传输和极高精度定位。基于去蜂窝超大规模MIMO系统的分布式天线阵列和以用户为中心的可伸缩服务架构,进行通信与感知一体化设计,实现高能/谱效传输与带内高精度感知定位,是一种有效的解决思路。首先介绍了未来移动通信系统的潜在技术和应用需求;接着从波束成形与系统性能分析、导频分配与信道估计、回程/前向链路受限下的性能优化等方面介绍了去蜂窝超大规模MIMO系统的研究现状;之后从基本信息理论分析、通信感知一体化接入方法、联合信道估计和位置更新方法、位置信息辅助的分布式波束成形、高能/谱效的分布式资源优化、高频段近场无线接入等方面分析了通感一体去蜂窝超大规模MIMO技术的未来研究方向;最后总结了通感一体去蜂窝超大规模MIMO系统的主要优势和未来仍需关注的问题。

With the rapid emergence of emerging applications such as holographic communications, digital twins, and virtual-real space integration and interaction, future mobile communication systems should be able to support ultra-large-capacity wireless transmission and extremely high-precision positioning. Based on the distributed antenna array of the cell-free ultra-massive MIMO system and user-centered scalable service architecture, integrated sensing and communication is an effective solution to realize high energy/spectral efficiency transmission and high-precision in-band sensing and positioning. First, the potential technologies and application requirements of future mobile communication systems are introduced. Then, the research status of cell-free ultra-massive MIMO systems is introduced from the aspects of beamforming and system performance analysis, pilot frequency allocation and channel estimation, and performance optimization under limited backhaul/forward link. After that, the future research direction of integrated communication sensing cell-free ultra-massive MIMO technology is analyzed from the aspects of basic information theory analysis, integrated communication sensing access method, joint channel estimation and location update method, location information assisted distributed beamforming, high-energy/spectral efficiency distributed resource optimization and high-frequency near-field wireless access. Finally, the main advantages and future problems of the integrated communication sensing cell-free ultra-massive MIMO system are summarized.