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## Energy-efficient relaying

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

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The next generations of wireless cellular communications will deploy flexible heterogeneous architectures including smart relays, femto, and macro base stations [28]. It is expected that 50 billion connected devices will operate by 2020, and that a lot of new services will be implemented including e-health, e-banking, e-learning, and so on. This requires both the data rates to grow by a factor of 1000 and the communication latency to be drastically reduced [8]. These requirements are to be realized with similar or even lower energy consumption as in current wireless communications. Therefore, we need an energy-efficient design of relay-assisted cellular networks.

Chapter Contents:

• 8.1 Introduction
• 8.1.1 Energy efficiency
• 8.1.2 Recent results
• 8.2 Energy-efficient relay protocol design
• 8.3 Energy-efficient power allocation with AF relaying
• 8.3.1 Centralized power allocation
• 8.3.2 Distributed power allocation
• 8.3.2.1 Distributed implementation
• 8.4 Energy-efficient resource allocation with multiple-antenna AF relaying
• 8.4.1 Relay interference neutralization
• 8.4.1.1 Required number of relay antennas
• 8.4.3 Centralized power allocation
• 8.4.4 Distributed power allocation
• 8.5 Multi-stream MIMO AF system
• 8.6 Numerical results
• 8.7 Conclusions
• References

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