基于双基地MIMO-OFDM的ISAC系统概念与演示
System Concept and Demonstration of Bistatic MIMO-OFDM-based ISAC
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中文总结 AI 辅助
本文针对6G网络中双基地ISAC的同步与多天线扩展问题，提出基于MIMO-OFDM的双基地ISAC系统概念及分布式同步方案，并通过27.5 GHz下4x8 MIMO实测验证其可行性。
中文摘要 AI 辅助
在未来的第六代（6G）移动网络中，雷达感知有望作为通信原有用途之外的一项附加服务提供。将这两种功能融合便形成了集成感知与通信（ISAC）系统。在此背景下，双基地ISAC成为一种可能方案，既能利用蜂窝网络的分布式特性，又能避免全双工操作等高要求的硬件需求。近期研究已提出基于正交频分复用（OFDM）的双基地ISAC节点间所需同步与数据交换策略，但仅限于单输入单输出架构。本文提出了一种基于双基地多输入多输出（MIMO）-OFDM的ISAC系统概念，在发射端和接收端均采用波束赋形，并提出了一种分布式同步概念，以确保不同接收通道之间的相干性，从而用于到达方向估计。在讨论了ISAC处理链路（包括发射机数字预失真和接收机校准等实际部署相关方面）之后，给出了一个在27.5 GHz下的4x8 MIMO测量装置及结果，以验证所提出的系统和分布式同步概念。
英文摘要
In future sixth-generation (6G) mobile networks, radar sensing is expected to be offered as an additional service to its original purpose of communication. Merging these two functions results in integrated sensing and communication (ISAC) systems. In this context, bistatic ISAC appears as a possibility to exploit the distributed nature of cellular networks while avoiding highly demanding hardware requirements such as full-duplex operation. Recent studies have introduced strategies to perform required synchronization and data exchange between nodes for bistatic ISAC operation, based on orthogonal frequency-division multiplexing (OFDM), however, only for single-input single-output architectures. In this article, a system concept for a bistatic multiple-input multiple-output (MIMO)-OFDM-based ISAC system with beamforming at both transmitter and receiver is proposed, and a distribution synchronization concept to ensure coherence among the different receive channels for direction-of-arrival estimation is presented. After a discussion on the ISAC processing chain, including relevant aspects for practical deployments such as transmitter digital pre-distortion and receiver calibration, a 4x8 MIMO measurement setup at 27.5 GHz and results are presented to validate the proposed system and distribution synchronization concepts.
