1 research outputs found
Erasure Broadcast Channels with Intermittent Feedback
Achievable data rates in wireless systems rely heavily on the available
channel state information (CSI) throughout the network. However, feedback
links, which provide this information, are scarce, unreliable, and subject to
security threats. In this work, we study the impact of having intermittent
feedback links on the capacity region of the canonical two-user erasure
broadcast channels. In our model, at any time instant, each receiver broadcasts
its CSI, and at any other node, this information either becomes available with
unit delay or gets erased. For this setting, we develop a new set of outer
bounds to capture the intermittent nature of the feedback links. These outer
bounds depend on the probability that the CSI from both receivers are erased at
the transmitter. In particular, if at any time, the CSI from at least one of
the two receivers is available at the other two nodes, then the outer-bounds
match the capacity with global delayed CSI. We also provide capacity-achieving
transmission strategies under certain scenarios, and we establish a connection
between this problem and Blind Index Coding with feedback.Comment: Submitte