This paper studies a multi-antenna network integrated sensing and communication (ISAC) system, in which a set of multi-antenna base stations (BSs) employ the coordinated transmit beamforming to serve their respectively associated single-antenna communication users (CUs), and at the same time reuse the reflected information signals to perform joint target detection. In particular, we consider two target detection scenarios depending on the time synchronization among BSs. In Scenario \uppercase\expandafter{\romannumeral1}, these BSs are synchronized and can exploit the target-reflected signals over both the direct links (from each BS to target to itself) and the cross links (from each BS to target to other BSs) for joint detection. In Scenario \uppercase\expandafter{\romannumeral2}, these BSs are not synchronized and can only utilize target-reflected signals over the direct links for joint detection. For each scenario, we derive the detection probability under a specific false alarm probability at any given target location. Based on the derivation, we optimize the coordinated transmit beamforming at the BSs to maximize the minimum detection probability over a particular target area, while ensuring the minimum signal-to-interference-plus-noise ratio (SINR) constraints at the CUs, subject to the maximum transmit power constraints at the BSs. We use the semi-definite relaxation (SDR) technique to obtain highly-quality solutions to the formulated problems. Numerical results show that for each scenario, the proposed design achieves higher detection probability than the benchmark scheme based on communication design. It is also shown that the time synchronization among BSs is beneficial in enhancing the detection performance as more reflected signal paths are exploited.
翻译:本文研究的是多antenna网络综合遥感和通信系统(ISAC),在这个系统中,一组多antenna基站(BS)使用协调的传输光束,为各自相关的单ANETNA通信用户(CUs)服务,同时再利用反映的信息信号,以进行联合目标检测。特别是,我们考虑两种目标检测情景,视BS之间的时间同步情况而定。在假设中,这些BS是同步的,在数字1}之后,这些BS可以同时使用一组多ANTERNA基站(BS)使用协调的传输信号信号信号信号,这些信号信号在直接连接(BS)之间(从每BS到目标目标)之间,我们优化了每个BS到目标的频率比(BS)之间的频率比,同时优化了在BS设计中最短的信号测试比(BS)之间的频率比,在BS的测试中,我们优化了最短的频率,在BS的信号比显示最短的测试比值。