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The degraded K-receiver broadcast channel (BC) is studied when receivers are aided with cache memories. Lower and upper bounds are derived on the capacity-memory tradeoff, i.e., on the largest rate that can be achieved as a function of the receivers' cache sizes. The lower bounds are achieved by two new coding schemes that benefit from non-uniform cache assignment. The paper also provides lower and...
The problem of communicating over a multiple access channel with cooperative encoders is studied. A new upper bound is derived on the capacity which is motivated by the regime of operation where the relays start to cooperate. The proof technique is based on a wringing lemma by Dueck and Ahlswede which was used for the multiple description problem with no excess rate. Previous upper bounds are shown...
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