Mitigating SATCOM Uplink Interference in Large Analog Phased Array via Sidelobe Cancellation

Interference mitigation remains a persistent challenge in satellite communication (SATCOM). Especially, a cost‐effective and efficient approach is demanded to full‐fill the 6G vision of ubiquitous coverage with low‐cost satellites. To this aim, we advocate applying sidelobe cancellation (SLC) in combination with analog phased arrays for SATCOM uplink interference mitigation. In this paper, we conduct theoretical performance analysis of such SLC system by proposing an approximate signal‐to‐interference‐plus‐noise (SINR) model. Specifically, we provide a mathematical explanation for the relationship between SINR and auxiliary array gain, which is a pivotal inquiry in system design but remains inadequately addressed. Based on these novel findings, we also propose an approach to optimize the system performance via online control of the auxiliary array gain. The proposed models and methods are rigorously validated through extensive simulations.