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Lora低功耗设计.pdf
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WIRELESS & SENSING
Revision 1 July 2013 © 2013 Semtech Corporation
1
SX1272/3/6/7/8
LoRa Modem Design Guide
SX1272/3/6/7/8: LoRa Modem
Low Energy Consumption Design
AN1200.17
TCo
WIRELESS & SENSING
Revision 1 July 2013 © 2013 Semtech Corporation
2
SX1272/3/6/7/8
LoRa Modem Design Guide
Table of Contents
1 Energy Consumption .................................................................................................................................... 3
1.1 Introduction ...................................................................................................................................................... 3
1.2 The LoRa Calculator ....................................................................................................................................... 3
1.3 Star Network Connectivity ............................................................................................................................... 4
2 Duty Cycled Receiver Consumption ........................................................................................................... 5
2.1 Channel Activity Detection .............................................................................................................................. 6
2.2 Energy Consumption during CAD ................................................................................................................... 7
3 Duty Cycled Receiver plus ACK Consumption .......................................................................................... 8
4 Periodic Transmission Based Protocols .................................................................................................. 10
5 Conclusion ................................................................................................................................................... 10
Table of Figures
Figure 1. The Opening view of the Calculator and Energy Profile Tools for LoRa performance Evaluation. ................ 3
Figure 2. Star Network Topology and Terminology. ...................................................................................................... 4
Figure 3. Basic Communication Exchanges between Source and Sink. ....................................................................... 4
Figure 4. A Long-Preamble Sampling MAC using Duty Cycled Receiver Operation .................................................... 5
Figure 5. LoRa CAD Timing ........................................................................................................................................... 6
Figure 6. Bidirectional Communication between Source and Sink in a Long-Preamble Sampling MAC. ..................... 8
Figure 7. Protocol Settings: Including the (Source Receiver) Duty Cycle, the Acknowledge Packet Length and
Number of Interrogations (Source Transmissions) per Day. .................................................................................. 8
Figure 8. Graphical Output of the Calculator. ................................................................................................................ 9
Figure 9. Energy Consumption Output of the Calculator. .............................................................................................. 9
DISCLAIMER
The performance figures are for indication only. For definitive product performance data please refer to the
datasheet.
WIRELESS & SENSING
Revision 1 July 2013 © 2013 Semtech Corporation
3
SX1272/3/6/7/8
LoRa Modem Design Guide
1 Energy Consumption
1.1 Introduction
The majority of ISM band radio deployments have both stringent link budget requirements and highly demanding
energy consumption requirements. Determining the trade-off between choices made in the radio physical (PHY) and
media access control (MAC) layers to meet these contradictory design requirements can be a time consuming
process. This process is further complicated when a new PHY technology is at the disposal of the designer. The
LoRa modem brings with it not only unique range capabilities, but also channel activity detection capabilities for
signals above and below the noise floor, all designed for low power operation.
In this guide we introduce the LoRa consumption calculator that allows a quick and simple evaluation of radio
energy consumption for a given LoRa configuration.
1.2 The LoRa Calculator
The LoRa calculator was introduced in the LoRa Designers Guide and can be downloaded from www.semtech.com.
The first tab of the calculator can be used to evaluate the basic link budget and time on air performance of the
selected modulation and packet parameters. The second tab introduces the Energy Profile of the selected
modulation.
Figure 1. The Opening view of the Calculator and Energy Profile Tools for LoRa performance Evaluation.
The current consumption of the radio node is, of course, of substantial interest in cases where the node is to be
battery powered. However, to meaningfully estimate the radio’s consumption the network connectivity and MAC
technique employed in the network must be considered.
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