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Relaying in green communication systems

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

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This chapter has discussed energy efficiency issues and comparisons among relay protocols. A widely applicable system model has been introduced along with relevant energy efficiency metrics. In addition, the importance of using models that can compute the overall energy consumption (not just the transmitted radio-frequency power) has been emphasized. We have discussed in detail the energy efficiency optimization of different relay protocols includingAF,DF and CF. Mathematical methods including a general fractional programming framework to minimize the energy consumption ratio have been presented and the best energy efficiency regions for deploying relays have also been presented. This chapter has also studied the benefits of using relaying to form VMIMO network configurations. The performance trade-offs for different relay protocols in this scenario have been discussed and compared. The spectral and energy efficiency comparisons of different relay setups with varying numbers of antennas have also been discussed.

Chapter Contents:

• 7.1 Introduction
• 7.2 Motivation
• 7.3 System model and description
• 7.3.1 Basic system model
• 7.3.2 Metrics for energy evaluation
• 7.3.3 Definition of optimization problems
• 7.3.4 Power consumption model
• 7.4 Comparison of EE of relay protocols for three-node scenario
• 7.4.1 Relaying protocols
• 7.4.1.1 AF relaying protocol
• 7.4.1.2 DF relaying protocol
• 7.4.1.3 CF relaying protocol
• 7.4.2 Optimization and comparison of ECR minimization
• 7.4.2.1 Fractional programming
• 7.4.2.2 AF-ECR minimization problem and solutions
• 7.4.2.3 DF-ECR minimization problem and solutions
• 7.4.2.4 CF-ECR minimization problem and solutions
• 7.4.3 Study of special cases
• 7.4.4 Numerical results
• 7.4.5 Conclusion
• 7.5 Energy efficiency analysis of relay cooperation
• 7.6 Conclusions
• Acknowledgements
• References

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