| Summary: | 碩士 === 國立彰化師範大學 === 電信工程研究所 === 101 === Television is a popular and convenient broadcasting media with a high worldwide penetration. Owing to the relatively low radio frequency, digital switchover, and good radiation characteristics, how to efficiently use the TV white space (TVWS) becomes an attractive research topic in the recent few years. In this thesis, we propose a new idea that utilizing the biological mutualism-based approach to efficiently accommodate cognitive radio network (CRN) and the TV network. The basic idea of biological mutualism-based approach is that both heterogeneous networks help each other for some particular purpose(s). In our exemplary example, the TV network provides idled spectra for the CRN, while the CRN relays the TV signal for better signal coverage and signal reliability. The biological mutualism-based approach aims to realize worldwide acceptance of the cognitive radio technology.
A total of three exemplary scenarios regarding how the CRN helps the TV network are investigated and we are focusing on spectrum interweaved CRN in this thesis. The basic mechanism is that the CRs can freely use the TVWS; meanwhile, the CRN helps to relay the TV signal when the TV network is busy. We use the TV broadcasting in Taipei as an example to validate the effectiveness of this approach. This idea paves a new way for a CRN to use TVWS.
According to the idea of biological mutualism, we propose a leader election algorithm which determines a particular CR leader from a cluster of CR transmitters. In particular, this election is based on where the location and the residual energy of each CR transmitter, the number of its neighbors. The CR leader plays a key role in the successful deployment of this new approach. We use the computer tool Radio Mobile™ to simulate the capability of signal coverage around Taipei city. After assessment, we find that the signal coverage can reach 115.25% of the area of Taipei city.
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