TY - JOUR
T1 - Enhanced Group-Based Chirp Spread Spectrum Modulation
T2 - Design and Performance Analysis
AU - Yu, Quantao
AU - Wang, Hua
AU - He, Dongxuan
AU - Lu, Zhiping
N1 - Publisher Copyright:
© 2014 IEEE.
PY - 2024
Y1 - 2024
N2 - LoRa is one of the most prominent low power wide area network (LPWAN) technologies for Internet of Things (IoT) applications. As the core technique of LoRa physical (PHY) layer, chirp spread spectrum (CSS) modulation is employed to support low power and long range communications. Although it provides a compelling trade-off between coverage and data rate, the relatively low spectral efficiency (SE) is still a limiting factor for its extensive applications. In this paper, we propose two enhanced group-based CSS modulation schemes, named IQ-GCSS (in-phase and quadrature group-based CSS) and TDM-GCSS (time domain multiplexed group-based CSS), which can achieve much higher SE than the conventional LoRa modulation. The transmitter architectures of our proposed modulation schemes are presented along with both coherent and non-coherent detection methods. Moreover, an overall performance analysis of our proposed schemes is provided in terms of bit error rate (BER) and computational complexity. Numerical results not only validate the accuracy of our theoretical analysis but also demonstrate substantial performance improvements of our proposed schemes in terms of effective throughput compared to the classical counterparts.
AB - LoRa is one of the most prominent low power wide area network (LPWAN) technologies for Internet of Things (IoT) applications. As the core technique of LoRa physical (PHY) layer, chirp spread spectrum (CSS) modulation is employed to support low power and long range communications. Although it provides a compelling trade-off between coverage and data rate, the relatively low spectral efficiency (SE) is still a limiting factor for its extensive applications. In this paper, we propose two enhanced group-based CSS modulation schemes, named IQ-GCSS (in-phase and quadrature group-based CSS) and TDM-GCSS (time domain multiplexed group-based CSS), which can achieve much higher SE than the conventional LoRa modulation. The transmitter architectures of our proposed modulation schemes are presented along with both coherent and non-coherent detection methods. Moreover, an overall performance analysis of our proposed schemes is provided in terms of bit error rate (BER) and computational complexity. Numerical results not only validate the accuracy of our theoretical analysis but also demonstrate substantial performance improvements of our proposed schemes in terms of effective throughput compared to the classical counterparts.
KW - chirp spread spectrum
KW - IoT
KW - LoRa
KW - LPWAN
KW - performance analysis
UR - http://www.scopus.com/inward/record.url?scp=85207889752&partnerID=8YFLogxK
U2 - 10.1109/JIOT.2024.3486126
DO - 10.1109/JIOT.2024.3486126
M3 - Article
AN - SCOPUS:85207889752
SN - 2327-4662
JO - IEEE Internet of Things Journal
JF - IEEE Internet of Things Journal
ER -