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## Cognitive relaying for information and energy cooperation

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Advanced Relay Technologies in Next Generation Wireless Communications — Recommend this title to your library

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The rapidly growing wireless networks come with great challenges such as fading degradation, spectrum scarcity and energy constraints. This chapter introduces advanced relaying techniques in cognitive radio networks in which the primary and the secondary systems actively seek for cooperation opportunities, that can deal with these challenges in an effective way. We focus on cooperation at both information level and energy level, such that the primary users' (PUs) performance can be boosted, the secondary users (SUs) have much higher chance for spectrum access, and energy flow is optimized to benefit both systems.

Chapter Contents:

• 9.1 Introduction
• 9.1.1 Wireless challenges and motivation
• 9.1.2 Literature review
• 9.1.2.1 Information cooperation
• 9.1.2.2 Energy cooperation
• 9.1.3 Organization of the chapter
• 9.1.3.1 Notations
• 9.2 Network model
• 9.3 Information cooperation
• 9.3.1 Problem formulation
• 9.3.2 Special structure of relaying matrix and reformulation
• 9.3.2.1 Optimal structure of {Am}
• 9.3.2.2 Physical insights and a simplified formulation
• 9.3.3 An efficient algorithm and distributed implementation
• 9.3.3.1 Derivation of the dual problem
• 9.3.3.2 The proposed algorithm based on fixed-point iteration
• 9.3.3.3 Distributed implementation
• 9.3.3.4 Conversion to the original downlink solutions
• 9.3.3.5 Analysis of signalling overhead
• 9.4 Information and energy cooperation
• 9.4.1 System setting
• 9.4.2 The ideal primary-cognitive cooperation
• 9.4.2.1 System model and problem formulation
• 9.4.2.2 Feasibility
• 9.4.2.3 Simplified characterization
• 9.4.3 A practical power-splitting cooperation
• 9.4.3.1 System model and problem setting
• 9.4.3.2 The closed-form optimal solution
• 9.5 Performance evaluation
• 9.5.1 Benchmark and proposed schemes
• 9.5.2 Outage performance due to the information cooperation
• 9.5.3 Improved rate region
• 9.5.4 Average SU rate
• 9.5.5 Outage performance due to the additional energy cooperation
• 9.6 Concluding remarks and future directions
• Appendix A: Proof of Theorem 9.1
• Appendix B: Proof of Proposition 9.1
• Appendix C: Closed-form solution to Problem (9.60)
• References

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