Successive Interference Cancellation for ISAC in a Large Full-Duplex Cellular Network
<|reference_start|>Successive Interference Cancellation for ISAC in a Large Full-Duplex Cellular Network: 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.<|reference_end|>
@article{ali2024successive,
    title={Successive Interference Cancellation for ISAC in a Large Full-Duplex
  Cellular Network},
    author={Konpal Shaukat Ali, Roberto Bomfin and Marwa Chafii},
    journal={arXiv preprint arXiv:2405.00109},
    year={2024},
    archivePrefix={arXiv},
    eprint={2405.00109},
    primaryClass={cs.IT math.IT}
}