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With potential applications to short-packet communication, we addresscommunication of low-latency messages in fast-fading channels under thepresence of a reactive jammer. Unlike a traditional jammer, we assume afull-duplex (FD) jammer capable of detecting pre-existing countermeasures andsubsequently changing the target frequency band. To facilitate reliablecommunication amidst a strong adversary, we propose non-coherent fast-forwardfull-duplex relaying scheme wherein the victim uses a helper in its vicinity tofast-forward its messages to the base station, in addition to ensuring that thecountermeasures are undetected by the FD adversary. Towards designing theconstellations for the proposed scheme, we identify that existing non-coherentconstellation for fast-fading channels are not applicable owing to thecooperative nature of the fast-forward scheme. As a result, we formulate anoptimization problem of designing the non-coherent constellations at the victimand the helper such that the symbol-error-probability at the base station isminimized. We theoretically analyze the optimization problem and proposeseveral strategies to compute near-optimal constellations based on the helper'sdata-rate and fast-forwarding abilities. We show that the proposedconstellations provide near-optimal error performance and help the victim evadejamming. Finally, we also prove the scheme's efficacy in deceiving thecountermeasure detectors at the jammer.

Constellation Design for Non-Coherent Fast-Forward Relays to Mitigate Full-Duplex Jamming Attacks