Committee:

Dr. Geoffrey Li, ECE, Chair , Advisor

Dr. Gordon Stuber, ECE

Dr. Mary Ann Weitnauer, ECE

Dr. John Barry, ECE

Dr. Xingxing Yu, Math

Abstract: 

The wide spread of mobile smart phones and ever-increasing demand for more throughput by the users has put a sever burden on cellular networks. Limited bandwidth availability and crowded base station deployments of the cellular system pushes network operators to improve existing network efficiency. This means reducing inter-cell interference such that each base station can maximize performance. In goal of this dissertation is to investigate techniques that mitigate inter-cell interference for modern cellular systems and focuses on development of practical scheduling algorithms for inter-cell interference coordination that can be applied to currently deployed LTE Release 8 networks and development of more advanced inter-cell interference mitigation techniques based on coordinated beamforming. Multi-user and multi-stream coordinated beamforming based on maximization of the harmonic-sum of signal-to-interference-plus-noise ratio is proposed. Additionally, coordinated beamforming algorithms are further extended to multi-carrier systems with per-antenna power constraints. Low complexity algorithm that can be applied to coordinated beamforming algorithms with whitened match filter structure is proposed and simulated. Simulations show that proposed algorithm enables excellent antenna power efficiency with low computational complexity. Furthermore, it can significantly mitigate inter-cell interference and improve performance over non-coordinating cellular system.