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Energy efficiency gains through opportunistic cooperative schemes in cognitive radio networks

Energy efficiency gains through opportunistic cooperative schemes in cognitive radio networks

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This chapter investigates how cognitive radio (CR) and cooperation would be an ideal combination, as cooperative systems can efficiently exploit the connectivity offered by spectrum cognition to ensure better spectrum usage. Approaches based on collaboration between cognitive and noncognitive nodes are actively pursued today to support the explosive growth of bandwidth-consuming services and drive the development of license-exempt applications. However, basic cooperative protocols often make use of relay resources in a deterministic fashion regardless of network randomness. As such, opportunistic cooperation through opportunistically scheduling the relay transmission is vital for reaping the performance benefit of cooperative communication. Little research efforts have developed practical proposals to demonstrate the system capabilities of hybrid architectures where the decision of cooperation is made depending on whether cooperation is beneficial or not. In this chapter, we introduce a novel cooperation selection scheme for dynamic spectrum access networks.

Chapter Contents:

  • 12.1 Contribution of the chapter
  • 12.2 Cognitive radio and cooperation: preliminaries
  • 12.2.1 Interaction between primary and secondary users
  • 12.2.2 Overview of spatial diversity in cognitive radio networks
  • 12.2.3 To cooperate or not? That is the question!
  • 12.2.4 A literature survey on opportunistic cooperation protocols
  • 12.3 Proposed work
  • 12.3.1 General analysis
  • 12.3.2 Opportunistic cooperative schemes
  • 12.3.2.1 Direct transmission mode: S ∈ C
  • 12.3.2.2 Relay assisted mode: S C̅
  • 12.3.2.3 Power minimization framework for opportunistic cooperation
  • 12.4 Numerical results and discussions
  • 12.5 Conclusions
  • References

Inspec keywords: protocols; cognitive radio; telecommunication power management; radio networks; energy conservation; cooperative communication; relay networks (telecommunication)

Other keywords: spectrum cognition; cognitive nodes; opportunistic cooperative schemes; dynamic spectrum access networks; cognitive radio networks; bandwidth-consuming services; noncognitive nodes; cooperation selection scheme; cooperative protocols; relay transmission; cooperative communication; energy efficiency gains

Subjects: Protocols; Radio links and equipment

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