Joint Bandwidth and Power Allocation in Wireless Communication Networks Studies and Research for Acceptance, a Thesis Entitled Joint Bandwidth and Power

Wireless communication networks have recently attracted significant research attention. As a critical issue for improving network performance, efficient and intelligent resource allocation strategies have been intensively studied. This thesis consists of two studies on resource allocation strategy, specifically, joint bandwidth and power allocation strategy, for wireless communication networks where both bandwidth and power are constrained resources. In the first study, joint bandwidth and power allocation strategy is proposed for wireless multi-user networks without relaying and with decode-and-forward relaying based on three system-wide objectives. It is shown that the formulated resource allocation problems are convex and, thus, the optimal solutions can be obtained efficiently using convex optimization techniques. Admission control based on the joint bandwidth and power allocation strategy is further considered. A greedy search algorithm is developed for solving the admission control problem efficiently, and the optimality conditions of the greedy search algorithm are derived and shown to be mild. In the second study, joint bandwidth and power allocation strategy is presented for maximizing the sum ergodic capacity of secondary users under fading channels in cognitive radio networks. Optimal bandwidth allocation is derived in closed-form for any given power allocation. The structure of optimal power allocation under each combination of four types of power constraints is derived. Using these structures, efficient algorithms are developed for finding the optimal power allocations. In summary, this thesis has proposed, analyzed and solved joint bandwidth and power allocation problems in wireless communication networks.