Energy-Efficient Modulation and Communication Technologies for Internet of Things Networks: A Focused Comparative Review and Research Agenda

Author

Sumistha Shrivastav, Nagendra Patel

Abstract

 Energy efficiency in Internet of Things (IoT) communications cannot be inferred from transmit power alone. It depends on modulation, airtime, receiver sensitivity, protocol overhead, connection procedure, retries, sleep scheduling, topology, and the delivery target of an application. This focused review compares four widely deployed IoT connectivity families: LoRaWAN based on chirp spread spectrum (CSS), Bluetooth Low Energy (BLE) based on Gaussian frequency-shift keying (GFSK), IEEE 802.15.4/Zigbee based on offset-QPSK with direct-sequence spread spectrum (O-QPSK/DSSS), and cellular narrowband IoT (NB-IoT), for which QPSK is a representative physical-layer modulation option. Rather than declaring a universal winner, the review organizes the evidence around energy per successfully delivered packet, coverage, latency, reliability, scalability, topology, and infrastructure dependence. The analysis shows that long range and low instantaneous transmit power do not guarantee minimum energy per delivered bit; the governing trade-off is the total radio-state and protocol cost required to meet an application service constraint. Key research gaps include inconsistent energy boundaries, non-comparable workloads, missing delivery-conditioned metrics, weak treatment of density and link quality, and limited trace-calibrated cross-technology studies. A cross-layer decision framework and a research agenda are proposed to enable fairer evaluation and application-aware technology selection.

Keywords

Internet of Things, energy efficiency, LoRaWAN, Bluetooth Low Energy, Zigbee, IEEE 802.15.4, NB-IoT, modulation techniques.

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References

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