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Nowadays, a promising solution to the demand for high capacity wireless services is provided by the high altitude platforms (HAPs), which can exploit the advantages of both satellites and terrestrial networks. However, due to the limited energy of the communication nodes on HAPs, energy-efficient deployment of airships for HAPs becomes increasingly important. In this paper, a heterogeneous network...
This paper presents a new image segmentation method that applies an edge-based level set method in a relay fashion. The proposed method segments an image in a series of nested subregions that are automatically created by shrinking the stabilized curves in their previous subregions. The final result is obtained by combining all boundaries detected in these subregions. The proposed method has the following...
In future communication system, the demand for high capacity is a challenging problem for wireless services, especially for delivery of the 'last mile'. A potential solution is offered by the high altitude platforms (HAPs), which can utilize the best character and tradeoff of both satellite and terrestrial networks. Since the performance of the HAPs depends on the structure of network, how to deploy...
Resource allocation is an important issue in cognitive radio networks. Optimizing this process is crucial for primary users (PUs) and secondary users (SUs) to maximize the performance of the whole network. In this paper, we investigate the RA-PS problem in cognitive radio networks, in which each PU acts as a relay for multiple SUs. We formulate this problem as a two-tier game. In the first RA-Game,...
Cooperative diversity is a transmission technique, where multiple terminals forms a virtual antenna array that realizes spatial diversity gain in a distributed fashion. The concept of cooperation has already been introduced to MAC layer to design MAC protocol. However, it's much different with that at physical layer. In this paper, we present a new MAC protocol based on IEEE 802.11, called C-MAC,...
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