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## Confidential and energy-efficient communications by physical layer security

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This book chapter has described a radio resource allocation framework to optimize both the confidentiality and the energy efficiency of a communication system. To this end, a key step has been the introduction of the new performance metric of SEE, defined as the ratio between the system secrecy capacity (or achievable rate) and the consumed power, including both radiated and hardware power.The chapter also features the application of the proposed framework to the special case of a MISOSE system, in which the legitimate receiver and the eavesdropper are equipped with only one antenna.

Chapter Contents:

• 3.1 Introduction
• 3.2 Preliminaries
• 3.2.1 Physical layer security and secrecy measures
• 3.2.2 Fractional programming theory
• 3.3 Radio resource allocation for SEE maximization
• 3.3.1 MIMOME system model
• 3.3.2 Radio resource allocation for MIMOME systems
• 3.3.3 SEE maximization with QoS constraints
• 3.3.4 Radio resource allocation for MISOSE systems
• 3.4 Numerical experiments
• 3.5 Conclusions
• References

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