|M.Sc Student||Shimonovich Jonathan|
|Subject||Cognitive Aspects in Multi-Terminal Communication|
|Department||Department of Electrical and Computer Engineering||Supervisor||PROF. Shlomo Shamai )Shitz(|
In this work, we investigate a three-user cognitive communication network where a primary two-user Multiple Access Channel (MAC) suffers interference from a secondary point-to-point (P2P) channel, sharing the same medium. While the P2P channel transmitter - transmitter 3 - causes interference at the primary MAC receiver, we assume that the primary channel transmitters - transmitters 1 and 2 - do not cause any interference at the P2P receiver. It is assumed that one of the MAC transmitters has cognitive capabilities and cribs causally from the other MAC transmitter. Furthermore, we assume that the cognitive transmitter knows the message of transmitter 3 in a non-causal manner, thus introducing the three-user Multiple Access Cognitive Z-Interference Channel (MA-CZIC). We obtain inner and outer bounds on the capacity region of the three-user MA-CZIC for both strictly and non-strictly causal cribbing cognitive encoders.
In the second part of this work we further investigate different variations and aspects of the MA-CZIC, referring to some previously studied cases. Attempting to better characterize the capacity region we look at the vertex points of the capacity region where each one of the transmitters tries to achieve its maximal rate. Moreover, we find the capacity region of a special case of MA-CZICs with the more-capable characteristic. In addition, we also examine the case of full cooperation between the 2 MAC encoders. Finally, since direct cribbing allows us full cognition in case of continuous input alphabet, we examine the case of partial cribbing, i.e., when the cribbing is performed via a deterministic function. Thus, allowing us to investigate the Gaussian MA-CZIC.