Relaying in green communication systems

Relaying in green communication systems

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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
  • AF relaying protocol
  • DF relaying protocol
  • CF relaying protocol
  • 7.4.2 Optimization and comparison of ECR minimization
  • Fractional programming
  • AF-ECR minimization problem and solutions
  • DF-ECR minimization problem and solutions
  • 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

Inspec keywords: mathematical programming; MIMO communication; relay networks (telecommunication); telecommunication power management; minimisation; amplify and forward communication; energy consumption; antenna arrays; decode and forward communication; energy conservation

Other keywords: mathematical method; spectral efficiency; amplifying-and-forwarding relay protocol; virtual multiinput multioutput setup; energy efficiency optimization; relay protocol; CF; VMIMO network configuration; energy consumption ratio minimization; decoding-and-forwarding relay protocol; fractional programming framework; compressing-and-forwarding relay protocol; DF; green communication system; AF; energy consumption

Subjects: Radio links and equipment; Antenna arrays; Optimisation techniques

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