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## Multibeam joint processing satellites: cooperative relays, high above

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The main goal of this chapter has been to introduce the reader to the most recent research developments on joint processing multibeam satellite communications. Since a joint processing enabled multibeam satellite constitutes a cooperative amplify-and-forward relay, these developments are closely related to the cooperative relaying literature. Nevertheless, as in detail described herein, the inherent nature of the satellite channel emanates fundamental differentiations in the proposed signal processing methods. Three main practical limitations have been overviewed. First, the need to jointly process signals over a fixed framing structure, coined as framed-based precoding. Second, the proper consideration of the non-idealities of real amplifiers and the effect they can have on precoded signals. Finally, but equally important, the detailed design of receivers that can operate in an interference-limited environment and adequately estimate the channel state of each user, so that precoding at the transmitter can be ultimately performed. If a single take home lesson needs to be gained from this overview would be that cooperative satellite relaying from high above is a mature technology from a research perspective and has reached the doorstep of practical demonstration and implementation.

Chapter Contents:

• 15.1 An introduction to multibeam satellite networks
• 15.2 Practical constraints
• 15.2.1 Channel state information acquisition
• 15.2.2 Frequency reuse
• 15.2.4 Framing
• 15.2.5 The non-linear satellite channel
• 15.3 System model
• 15.3.1 Multicast model
• 15.3.2 Multibeam satellite channel
• 15.3.3 Average user throughput
• 15.4 Sum rate and throughput maximization
• 15.4.1 Per-antenna power constrained sum-rate maximization
• 15.4.2 Throughput maximization under availability constraints
• 15.4.2.1 Sum-rate maximization under MRCs
• 15.4.2.2 Throughput maximization
• 15.4.3 Performance evaluation
• 15.5 Linear precoding over non-linear channels
• 15.5.1 The non-linear multibeam channel
• 15.5.2 Effects of non-linear amplification
• 15.5.2.1 PAPR analysis
• 15.5.2.2 Scatterplot analysis
• 15.5.3 Counteracting non-linearities
• 15.6.1 DVB-S2X superframe structure
• 15.6.1.1 Bundled PL-Frames - long frame
• 15.6.1.2 Bundled PL-Frames - short frame
• 15.6.2 Synchronization and channel acquisition
• 15.6.2.1 Synchronization procedure
• 15.7 Conclusions
• References

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