期刊
IEEE WIRELESS COMMUNICATIONS LETTERS
卷 11, 期 9, 页码 1995-1999出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2022.3190564
关键词
LoRa; low power wide area networks; chirp spread spectrum; IoT
This study proposes a dual-mode chirp spread spectrum (DM-CSS) modulation for low-power wide-area networks, which achieves higher spectral efficiency and energy efficiency than classical counterparts such as LoRa modulation. The DM-CSS scheme multiplexes even and odd chirp signals, uses phase shifts, and either up-chirp or down-chirp signals to increase the spectral efficiency. The proposed transceiver architecture and non-coherent detection process demonstrate the effectiveness and robustness of DM-CSS.
In this letter, we propose dual-mode chirp spread spectrum (DM-CSS) modulation for low-power wide-area networks. DM-CSS is capable of achieving a higher spectral efficiency (SE) relative to its counterparts, such as Long Range (LoRa) modulation. Considering the same symbol period, the SE in DM-CSS are augmented by: (i) simultaneously multiplexing even and odd chirp signals; (ii) using phase shifts of 0 and pi radians for both even and odd chirp signals; and (iii) using either up-chirp or down-chirp signal. The SE increases by up to 116.66% for the same bandwidth and spreading factor relative to LoRa. We present a complete transceiver architecture along with non-coherent detection process. Simulation results reveal that DM-CSS is not only more spectral efficient but also more energy efficient than most classical counterparts. It is also demonstrated that DM-CSS is robust to phase and frequency offsets.
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