Energy Efficient Cognitive Radio Networks

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With the high demands and rapid evolution for wireless communications, energy consumption of wireless networks has escalated significantly, and become a major threat for environmental protection. Meanwhile, energy costs account for a significant portion of a mobile operator's operating expenses. Building energy efficient wireless communication systems has become an urgent need for sustainable development of wireless communication networks and services. Among various wireless communication techniques, cognitive radio networks (CRNs) have attracted a considerable amount of attentions from both the academia and industry. CRNs access the radio spectrum that is allocated but not fully utilized by other networks. Cognitive radio devices have the ability to sense the environment, adaptively adjust their work modes, and effectively provide various services. CRNs are expected to be very widely deployed in the near future to cope with the spectrum scarcity problem caused by the high demands for wireless communications and traditional fixed radio spectrum allocations. Currently, the work on CRNs mainly focuses on how to efficiently detect and utilize the available radio resources and to support various services. The objective of this project is to design and analyze performance of energy efficient CRNs. We will i) identify challenges and complexities raised by the secondary nature of the CRNs, ii) explore the intricate trade-offs between energy efficiency, data transmission performance, and implementations of CRNs for energy saving, and iii) take advantage of various diversities and opportunities brought by the built-in cognitive capabilities of CRN devices to achieve high energy efficiency. This research is of paramount importance for the proliferation of future wireless communication services and for protecting the environment we live in. The outcome of this research will contribute to providing wireless communication services that are both energy efficient and spectrum efficient. It will foster the progress of green wireless communications and further towards green telecommunications in Canada, which will have a long-term impact on the sustainable development of the Canadian society.