Cache-aided cooperation with no CSIT

Eleftherios Lampiris (1) , Jingjing Zhang (1) , Petros Elia (1)

1 Eurecom [Sophia Antipolis]

This work explores cache-aided interference management in the absence of channel state information at the transmitters (CSIT), focusing on the setting with K transmitter/receiver pairs endowed with caches, where each receiver k is connected to transmitter k via a direct link with normalized capacity 1, and to any other transmitter via a cross link with normalized capacity τ ≤ 1. In this setting, we explore how a combination of pre-caching at transmitters and receivers, together with interference enhancement techniques, can a) partially counter the lack of CSIT, and b) render the network self-sufficient, in the sense that the transmitters need not receive additional data after pre-caching. Toward this we present new schemes that blindly harness topology and transmitter-and-receiver caching, to create separate streams, each serving many receivers at a time. Key to the approach here is a combination of rate-splitting, interference enhancement and coded caching.

Domaines: Ingénierie assistée par ordinateur

Eleftherios Lampiris, Jingjing Zhang, Petros Elia. Cache-aided cooperation with no CSIT. ISIT 2017, IEEE International Symposium on Information Theory, Jun 2017, Aachen, Germany. pp.2960-2964, ⟨10.1109/ISIT.2017.8007072⟩. ⟨hal-03558171⟩