Utilization of stored signals in interference networks

Abstract

In order to properly control the interference, we focused on the utilization of the stored signals to manage the interference. For two cases of the stored system, which are ``stored signals at receivers" and ``stored signals at transmitters", we analyze the performance with an asymptotic perspective. For stored signals at receivers, we propose ergodic interference alignment techniques for $K$-user interference channels with delayed feedback and propose new retrospective IA schemes for the delayed feedback for 2-user MIMO interference channel with a cognitive relay. We show the performances of both schemes via DoF and also show that both scheme can achieve best or optimal DoF. For stored signals at transmitter, we propose a jamming-aided hierarchical cooperation scheme and show that the optimal secrecy capacity scaling can be achieved. We also analyze the tolerable intensity of eavesdroppers when we set the power of jamming signal as zero and show that optimal secrecy capacity scaling can be achieved without jamming if only few eavesdroppers exist.