Computer Science – Information Theory
Scientific paper
2009-06-20
Computer Science
Information Theory
This paper was presented at the IEEE Information Theory Workshop, Volos, Greece, June 2009
Scientific paper
The problem of multicasting multiple messages with the help of a relay, which may also have an independent message of its own to multicast, is considered. As a first step to address this general model, referred to as the compound multiple access channel with a relay (cMACr), the capacity region of the multiple access channel with a "cognitive" relay is characterized, including the cases of partial and rate-limited cognition. Achievable rate regions for the cMACr model are then presented based on decode-and-forward (DF) and compress-and-forward (CF) relaying strategies. Moreover, an outer bound is derived for the special case in which each transmitter has a direct link to one of the receivers while the connection to the other receiver is enabled only through the relay terminal. Numerical results for the Gaussian channel are also provided.
Goldsmith Alfred
Gunduz Deniz
Poor Harold Vincent
Shamai Shlomo
Simeone Osvaldo
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