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## Relaying for massive MIMO

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

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Multi-user massive MIMO relaying is a cost-effective, pragmatic solution to one of the fundamental bottlenecks of the wireless physical layer, namely, the low-area spectral efficiency. Specifically, a combination of massive MIMO and wireless relaying techniques can potentially be exploited for improving the trade-off between spectral efficiency and coverage, thereby substantially improving the achievable area spectral efficiency. To this end, in this chapter, system configurations, transmission frame structures, CSI acquisition techniques and signal processing aspects for multi-user massive MIMO relay networks have been presented. Moreover, the corresponding channel models and favourable propagation conditions have been reviewed, and thereby, a generalized end-to-end signal model has been developed. First, the performance analysis techniques and the underlying mathematical tools have been presented, and then, they have been used for deriving basic performance metrics including asymptotic SINR and achievable sum rate expressions. Finally, important insights have been drawn by using these performance metrics, and thereby, the validity and viability of the proposed system, channel and signal models can be ascertained.

Chapter Contents:

• 2.1 Introduction
• 2.1.1 Single-hop massive MIMO systems
• 2.1.2 Dual-hop massive MIMO systems
• 2.2 System configurations
• 2.2.1 Antenna configuration
• 2.2.2 Acquisition of channel state information and duplexing modes
• 2.2.2.1 CSI acquisition in FDD mode
• 2.2.2.2 CSI acquisition in TDD mode
• 2.2.2.3 CSI acquisition for relaying in TDD mode
• 2.2.2.4 CSI acquisition for multi-cell massive MIMO
• 2.2.3 Transmission frame structure
• 2.3 Favourable propagation in massive MIMO
• 2.3.1 Channel modelling
• 2.4 Channel estimation
• 2.5 Massive MIMO configurations and signal processing aspects
• 2.5.1 General end-to-end signal model
• 2.5.2 Signal processing aspects
• 2.5.2.1 Case-1: Signal processing at destination
• 2.5.2.2 Case-2: Signal processing at relay
• 2.5.2.3 Case-3: Signal processing at relay and destination
• 2.6 Fundamental performance metrics
• 2.7 Case study
• 2.7.1 Transmit power scaling at user nodes
• 2.7.2 Transmit power scaling at relay nodes
• 2.7.3 Transmit power scaling at user and relay nodes
• 2.7.4 Numerical results
• 2.8 Summary
• References

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