Jamming countermeasures for multi-user MISO broadcast channels - a DoF perspective

Jamming attacks can significantly impact the performance of wireless communication systems, and lead to insurmountable overhead in terms of re-transmissions and increased power consumption. In this paper, we consider the multi-user multiple-input single-output (MISO) broadcast channel (BC) in the presence of jamming attacks in which a subset of the users can be selectively jammed at any given time. We present countermeasures for mitigating the effects of such jamming attacks. The effectiveness of these anti-jamming countermeasures is quantified in terms of the degrees-of-freedom (DoF) of the MISO BC under various assumptions regarding the availability of the channel state information (CSIT) and the jammer state information at the transmitter (JSIT).