Survey of PHY and LINK Layer Functions of Cognitive Radio Networks for Opportunistic Spectrum Sharing

Cognitive Radio recently arises as the enabling technology for opportunistic spectrum sharing, has drawn significant attentions from the wide range of research communities, including signal processing, machine learning, networking and algorithms. We survey the research challenges of designing cognitive radio networks for opportunistic spectrum sharing, with the aim of sparking new research interests in this field. We follow a layered approach where PHY and LINK layer functions are classified respectively and associated open research questions are proposed. In our work, firstly various proposed cognitive radio network architectures are reviewed associated with open research questions for each of those network architectures. Secondly, we survey the cognitive radio physical layer functions and propose open research questions at physical layer. Thirdly, we focus on link layer functions of cognitive radio networks and propose the open research questions.

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