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This paper presents a study on joint optimization of antenna orientation and spectrum allocation, with the objective of maximizing the total throughput of a cognitive radio network. The mathematical model is presented and subsequently formulated as a Mixed Integer Linear Programming problem. We obtain the optimal solution by adopting the branch and bound algorithm. Through simulation results, we investigate...
We consider a cognitive radio network in which a set of base stations make opportunistic spectrum access to support wireless subscribers within their covering cells. The spectrum of interest is divided into independent channels licensed to the primary users. Channel assignment and power control must be carried out in the cognitive network so that no excessive interference is caused to the primary...
Relay transmissions improve performance and save communication energy in wireless network. We present an optimal relay nodes assignment algorithm to maximize the number of information packets received at the sink for a two-tiered wireless network, in which the relay nodes are temporarily placed and have energy constraint. We first derive the optimal transmit power theory from relay node to sink node...
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