PERFORMANCE STUDY OF POWER ALLOCATION SCHEMES IN ULTRA-DENSE NETWORKS

Abstract

In this thesis, user association and power allocation are studied in ultra-dense wireless communication networks, in which access points are densely deployed. The thesis contribution is two-fold. First, with the objective of increasing the system’s uplink throughput, two different approaches are proposed for resource sharing. Interference resulting from such resource sharing is reduced by heuristically optimizing the user association to access points as well as power allocation to each user. The thesis compares various power allocations schemes, such as the well-known water-filling algorithm, the recently adopted non-orthogonal multiple access (NOMA), as well as others. In this thesis also, downlink NOMA transmission in ultra-dense networks is studied. Solutions for access points grouping, user association and resource sharing among users are proposed taking into consideration access point locations as well as channel state information.