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## SUDAS: mmWave relaying for 5G outdoor-to-indoor communications

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

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In this chapter, we have proposed a novel SUDAS with the objective of achieving the 10 Gbit/s data rate goal set by 5G for indoor UEs. The proposed SUDAS exploits the benefits of the licensed and unlicensed frequency bands simultaneously. In particular, it translates the spatial multiplexing in the licensed bands into frequency multiplexing in the unlicensed bands for boosting the end-to-end data rate via VMIMO. It is expected that the proposed SUDAS can further enhance the system performance when advanced resource allocation technique is employed. Besides, we have also discussed some potential application scenarios where deployment of SUDAS appears to be beneficial. Also, we have investigated different potential realizations of SUDAS and the corresponding implementation challenges. It is expected that the proposed SUDAS is able to bridge the gap between the current technology and the high data rate requirement of the next generation communication systems.

Chapter Contents:

• 3.1 Introduction
• 3.2 5G communication systems
• 3.2.1 Massive MIMO
• 3.2.2 Small cells and mmWaves
• 3.2.3 Combinations of massive MIMO and mmWave
• 3.2.4 SUDAS - overview
• 3.2.5 SUDAS - working principle
• 3.2.6 SUDAS - application scenarios
• 3.2.6.1 Scenario 1
• 3.2.6.2 Scenario 2
• 3.2.6.3 Scenario 3
• 3.2.7 Comparisons with VMIMO
• 3.3 SUDAC - implementation
• 3.3.1 Amplify-and-forward
• 3.3.2 Compress-and-forward
• 3.4 Mathematical system model
• 3.4.1 SUDAS downlink communication model
• 3.4.2 System throughput
• 3.5 Numerical results
• 3.5.1 Average system throughput versus transmit power
• 3.5.2 Average system throughput versus number of SUDACs
• 3.6 SUDAS - challenges
• 3.6.1 Keyhole effect
• 3.6.2 Carrier aggregation
• 3.6.3 Resource allocation for multiple MNOs
• 3.6.4 Mobility
• 3.6.5 Synchronization and channel estimation
• 3.6.6 Power consumption
• 3.7 Conclusions
• Acknowledgements
• References

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