To reuse the scarce spectrum efficiently, a large full-duplex cellular network with integrated sensing and communication (ISAC) is studied. Monostatic detection at the base station (BS) is considered. At the BS, we receive two signals: the communication-mode uplink signal to be decoded and the radar-mode signal to be detected. After self-interference cancellation (SIC), inspired by NOMA, successive interference cancellation (SuIC) is a natural strategy at the BS to retrieve both signals. However, the ordering of SuIC, usually based on some measure of channel strength, is not clear as the radar-mode target is unknown. The detection signal suffers a double path-loss making it vulnerable, but the uplink signal to be decoded originates at a user which has much lower power than the BS making it weak as well. Further, the intercell interference from a large network reduces the channel disparity between the two signals. We investigate the impact of both SuIC orders at the BS, i.e., decoding $1^{st}$ or detecting $1^{st}$ and highlight the importance of careful order selection. We find the existence of a threshold target distance before which detecting $1^{st}$ is superior and decoding $2^{nd}$ does not suffer much. After this distance, both decoding $1^{st}$ and detecting $2^{nd}$ is superior. Similarly, a threshold UE power exists after which the optimum SuIC order changes. We consider imperfections in SIC; this helps highlight the vulnerability of the decoding and detection in the setup.

翻译：为高效复用稀缺频谱，本文研究了一种集成感知与通信（ISAC）的大型全双工蜂窝网络。考虑基站（BS）处的单站检测。在基站处接收两类信号：需解码的通信模式上行链路信号和需检测的雷达模式信号。在自干扰消除（SIC）后，受非正交多址接入（NOMA）启发，连续干扰消除（SuIC）成为基站处恢复两类信号的自然策略。然而，通常基于某种信道强度度量的SuIC排序因雷达模式目标未知而难以确定。检测信号受双路径损耗影响使其脆弱，但需解码的上行链路信号来自功率远低于基站的用户，同样强度微弱。此外，大型网络的跨小区干扰进一步削弱了两类信号间的信道差异。我们研究了基站处两种SuIC排序的影响，即先解码后检测与先检测后解码，并强调了谨慎选择排序的重要性。研究发现存在一个目标距离阈值：小于该阈值时先检测后解码更优，且后解码的损耗较小；超过该阈值后先解码后检测更优。同样，存在用户设备（UE）功率阈值，超过该阈值后最优SuIC排序将发生改变。我们考虑了SIC的非理想性，这有助于揭示该架构下解码与检测的脆弱性。