Efficient Design of Chirp Spread Spectrum Modulation for Low-Power Wide-Area Networks

LoRa is an abbreviation for low power and long range and it refers to a communication technology developed for low-power wide-area networks (LPWANs). Based on the principle of chirp spread spectrum (CSS), LoRa technology is very attractive to provide low bit-rate wireless connections over an extende...

Full description

Saved in:
Bibliographic Details
Published in:IEEE internet of things journal 2019-12, Vol.6 (6), p.9503-9515
Main Authors: Nguyen, Tung T., Nguyen, Ha H., Barton, Robert, Grossetete, Patrick
Format: Article
Language:English
Subjects:
Access control
Bandwidth
Baseband
Cascading style sheets
Chirp
Chirp spread spectrum (CSS)
Demodulation
digitally controlled oscillator (DCO)
Energy conservation
Frequency modulation
Internet of Things
Internet of Things (IoT)
LoRa
Modulation
orthogonal chirp generator (OCG)
Power consumption
Spread spectrum
Wide area networks
Wireless communications
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:LoRa is an abbreviation for low power and long range and it refers to a communication technology developed for low-power wide-area networks (LPWANs). Based on the principle of chirp spread spectrum (CSS), LoRa technology is very attractive to provide low bit-rate wireless connections over an extended communication range and under very low power consumption. While the medium access control (MAC) layer of LoRa specifications is open for developers, the physical layer is not. In particular, LoRa modulation and demodulation techniques are patented by Semtech and have not been mathematically described in detail. This paper presents novel approaches to modulate and demodulate LoRa signals with very high implementation efficiency, great flexibility, and excellent performance. In particular, compared to the commercially available receiver made by Semtech, the proposed design is shown to yield a saving of transmitted power from 0.9 to 2.5 dB over the spreading factor (SF) range of 6-12. Moreover, this paper suggests a method to exploit the phase information of CSS signals to encode extra information bits, leading to throughput improvement over the conventional CSS system, for example, by 33%, 25%, 20%, and 17% for SFs of 6, 8, 10, and 12, respectively.
ISSN:2327-4662
2327-4662
DOI:10.1109/JIOT.2019.2929496