| Summary: | 碩士 === 國立中興大學 === 資訊科學與工程學系所 === 99 === With the explosive growth of network traffic, we need faster and more reliable network technology nowadays. The impact of fading and other impairments in wireless channels can be counteracted by leveraging communication diversity and introducing cooperative paradigms, where third-party nodes contribute to assist the communication. In this thesis we describe and evaluate two possible cooperative approaches, cooperative relaying and coded cooperation. Different from existing works where similar evaluations are mainly performed for a single link, we take a network-wide perspective to evaluate the effects of cooperation on the link it is performed as well as other links in the networks.
We focus on a multiple-input multiple-output ad hoc scenario and show that the improvement brought by cooperative routing and coded cooperation is not always sufficient; in certain cases the former can be ineffective if relay is not properly selected, and the latter leads to an overall increase of interference, thus worsening the quality of surrounding links.
However, we suggest that these two features can be combined in an advantageous manner in order to mutually overcome their problems. Such a joint solution is shown to achieve a significant improvement over the two individual approaches in the experimental result. We conclude by discussing future evolutions of the cooperation paradigm, including both cooperative routing and coded cooperation, and their advanced implementation issues.
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