We address the resilience of future 6G MIMO communications by considering an uplink scenario where multiple legitimate transmitters try to communicate with a base station in the presence of an adversarial jammer. The jammer possesses full knowledge about the system and the physical parameters of the legitimate link, while the base station only knows the UL-channels and the angle-of-arrival (AoA) of the jamming signals. Furthermore, the legitimate transmitters are oblivious to the fact that jamming takes place, thus the burden of guaranteeing resilience falls on the receiver. For this case we derive one optimal jamming strategy that aims to minimize the rate of the strongest user and multiple receive strategies, one based on a lower bound on the achievable signal-to-interference-to-noise-ratio (SINR), one based on a zero-forcing (ZF) design, and one based on a minimum SINR constraint. Numerical studies show that the proposed anti-jamming approaches ensure that the sum rate of the system is much higher than without protection, even when the jammer has considerably more transmit power and even if the jamming signals come from the same direction as those of the legitimate users.

翻译：我们通过考虑一个上行场景来探讨未来6G MIMO通信的韧性：在该场景中，多个合法发射机试图在存在对抗性干扰机的情况下与基站进行通信。干扰机完全了解系统和合法链路的物理参数，而基站仅知道上行信道和干扰信号的到达角（AoA）。此外，合法发射机对干扰的存在毫不知情，因此保证韧性的责任落到了接收机身上。针对这种情况，我们推导出一种旨在最小化最强用户速率的优化干扰策略，以及多种接收策略：一种基于可达信干噪比（SINR）下界，一种基于迫零（ZF）设计，以及一种基于最小SINR约束。数值研究表明，即使干扰机拥有显著更高的发射功率，甚至当干扰信号与合法用户信号来自同一方向时，所提出的抗干扰方法也能确保系统总速率远高于无保护情况。