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Toward High Bit Rate LoRa Transmission via Joint Frequency-Amplitude Modulation

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Publicado en:Electronics vol. 14, no. 13 (2025), p. 2687-2709
Autor principal: Tang Gupeng
Otros Autores: Zhao Zhidan, Zhang, Chengxin, Wu, Jiaqi, Jing, Nan, Wang, Lin
Publicado:
MDPI AG
Materias:
Spread spectrum
Fourier transforms
Signal to noise ratio
Wide area networks
Bandwidths
Power management
Spectrum allocation
Algorithms
Frequency modulation
Performance evaluation
Energy consumption
Software radio
Chirp
Amplitude modulation
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Resumen:Long Range (LoRa) is one of the promising Low-Power Wide-Area Network technologies to achieve a strong anti-noise ability due to the modulation of the chirp spread spectrum in low-power and long-distance communications. However, LoRa suffers the problem of packet collisions. Hence, we propose QR−LoRa, a novel PHY-layer scheme that can transmit data in both amplitude and frequency dimensions simultaneously. For the amplitude modulation, we modulate the constant envelope of a LoRa chirp with a cyclic right-shifted ramp signal, where the cyclic right-shifted position carries the data of the amplitude modulation. We adopt the standard LoRa for frequency modulation. We prototype QR−LoRa on the software-defined radio platform USRP N210 and evaluate its performance via simulations and field experiments. The results show the bit rate gain of QR−LoRa is up to 2× compared with the standard LoRa device.
ISSN:2079-9292
DOI:10.3390/electronics14132687
Fuente:Advanced Technologies & Aerospace Database