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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 42734 (05)
- University: Sharif University of Technology
- Department: Electrical Engineering
- Advisor(s): Nasiri Kenari, Masoumeh; Hosseini Khalaj, Babak
- Abstract:
- In this thesis, we derive an achievable Degrees of Freedom (DoF) region for a MIMO channel that models uplink transmission in a cellular network of two interfering cells with two users in each cell, under two different genie-aided cognitive scenarios; a cognitive cell together with a primary cell, and a cognitive transmitter with a primary transmitter in each cell. Most of the previous works dealt with networks with only two transmitters. Here, we study the effect of increase in the number of transmitters on nullifying and aligning the interference. In each scenario, an outer bound on the DoF region is derived. Then, we evaluate how cognition can improve the maximum achievable DoF by comparing the maximum sum DoF of the network with no cognition with that of cognitive networks.Then, we will extend the scheme of achieving integer values of DoF towards a network with three transmitters in each cell for all scenarios, i.e. when there is no cognition, a cognitive cell together with a primary cell, and cognitive transmitters with primary transmitters in each cell.Finally, we will provide a conclusion and some ideas for further investigation in the last chapter
- Keywords:
- Uplink Channel ; Freedom Region Degrees ; Interference Alignment ; 2-Interfering Multiple Access Channels (2IMAC) ; Cognitive Message Sharing
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