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## Ultra-narrow-band for IoT

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LPWAN (low power wide area network) is a very recent term (appeared in 2013), referring to a very wide area network (covering up to several tens of kilometers range in rural areas with a single access point). The objective of such network is to provide connectivity to the Internet to a huge number of nodes deployed anywhere, in the Internet of Things (IoT) context. LPWAN gateways are thus needed to settle communication with the devices in their vicinity. To limit the operational cost of the operators, a limited -access infrastructure is suitable. As a consequence, a collecting point should serve nodes deployed in a very wide area. However, this cannot be obtained by tuning up the emission power, because it must be achieved while keeping a low -energy consumption for the nodes to preserve the network lifetime.

Chapter Contents:

• 9.1 Introduction
• 9.2 UNB system
• 9.2.1 UNB definition
• 9.2.2 Topology: single cell design
• 9.3 UNB interference characterization
• 9.4 UNB-associated MAC
• 9.4.1 Performance of CR-FDMA and DR-FDMA
• 9.4.2 Throughput of CR-FTDMA
• 9.5 UNB performances for same received power at the BS
• 9.5.1 One transmission
• 9.5.2 Multiple transmissions
• 9.6 UNB performances for diverse received power at the BS
• 9.6.1 Rectangular interference shape and stochastic geometry
• 9.6.2 Exact interference shape
• 9.6.3 Validation and comparison
• 9.6.4 Network spectral efficiency
• 9.7 Interference cancellation
• 9.8 Conclusion
• References

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