Integrated sensing and communication (ISAC) is a promising technique to provide sensing services in future wireless networks. Numerous existing works have adopted a monostatic radar architecture to realize ISAC, i.e., employing the same base station (BS) to transmit the ISAC signal and receive the echo. Yet, the concurrent information transmission causes unavoidable self-interference (SI) to the radar echo at the BS. To overcome this difficulty, we propose a coordinated cellular network-supported multistatic radar architecture to implement ISAC, which allows us to spatially separate the ISAC signal transmission and radar echo reception, intrinsically circumventing the problem of SI. To this end, we jointly optimize the transmit and receive beamforming policy to minimize the sensing beam pattern mismatch error subject to ISAC quality-of-service requirements. The resulting non-convex optimization problem is tackled by an alternating optimization-based suboptimal algorithm. Simulation results showed that the proposed scheme outperforms the two baseline schemes adopting conventional designs.

翻译：集成感知与通信（ISAC）是未来无线网络中提供感知服务的一项有前景的技术。现有众多研究采用单站雷达架构实现ISAC，即利用同一基站（BS）发射ISAC信号并接收回波。然而，并行的信息传输会在基站处对雷达回波造成不可避免的自干扰（SI）。为解决这一难题，本文提出一种协作蜂窝网络支持的多站雷达架构来实施ISAC，该架构允许将ISAC信号发射与雷达回波接收在空间上分离，从根本上规避了自干扰问题。为此，我们联合优化发射和接收波束赋形策略，以在满足ISAC服务质量要求的前提下最小化感知波束方向图匹配误差。该非凸优化问题通过一种基于交替优化的次优算法予以解决。仿真结果表明，所提方案优于采用传统设计的两种基线方案。