An Achievable Rate Region for Interfering Broadcast Channel and Multiple Access Channel with Cognitive Transmitters

Abstract

We consider the inter-cluster cognitive behavior of two<br><br>dissimilar interfering clusters, where the first cluster (i.e. primary<br><br>cluster) consists of a broadcast channel (BC) which has a single<br><br>sender and two receivers and the second cluster (i.e. cognitive<br><br>cluster) is a single multiple access channel (MAC) with two senders<br><br>and one receiver. The MAC is assumed to have cognitive<br><br>transmitters, who know the message transmitted by the other noncognitive<br><br>broadcast transmitter, in a non-causal manner. A<br><br>Gel’fand-Pinsker coding-like technique is used to mitigate intercluster<br><br>interference. First, an achievable rate region for this model<br><br>is derived based on the Marton with common message region for<br><br>the general BC and using a result of Slepian-Wolf rate region for<br><br>the MAC. Then by using the rate region of the second cluster, we<br><br>obtain the achievable rate region for the two-user MAC with<br><br>common message and common side information known noncausally<br><br>at the transmitters and show that the obtained achievable<br><br>rate region is optimal when common side information is known at<br><br>the receiver as well.