On the jamming power allocation and signal design in DF relay networks

This paper studies a simple decode-and-forward (DF) relay network in the presence of a jammer. The jammer is able to send noise-like signals to interfere with the signal reception at both the relay and the destination. From the attacker's point of view, we investigate the following two design problems: i) What is the optimal probability distribution of the random jamming signals? ii) Given a total jamming power budget, how to optimally allocate the power between attacking the relay and attacking the destination? We provide analytical solutions to these design problems for both quasi-static and ergodic fading channels.