Cache-aided cooperation with no CSIT

Lampiris, Eleftherios; Zhang, Jingjing; Elia, Petros
ISIT 2017, IEEE International Symposium on Information Theory, June 25-30, 2017, Aachen, Germany

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 selfsufficient, 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-andreceiver 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.

Systèmes de Communication
Eurecom Ref:
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