Hybrid Chirp Signal Design for Improved Long-Range (LoRa) Communications

Signals

H. Vincent Poor¹  Apel Mahmud²  Xinde Li³  Md. Noor-A-Rahim⁴  Dirk Pesch⁴  M. Omar Khyam⁵ 

[1] Department of Electrical and Computer Engineering, Princeton University, Princeton, NJ 08544, USA;Faculty of Engineering and Environment, Northumbria University Newcastle, Newcastle upon Tyne NE7 7YT, UK;School of Automation, Southeast University, Nanjing 210096, China;School of Computer Science & IT, University College Cork, T12 K8AF Cork, Ireland;School of Engineering and Technology, Central Queensland University, Melbourne, QLD 4701, Australia;

关键词: LoRa;    LoRaWAN;    IoT;    LPWAN;    chirp modulation;   

DOI  :  10.3390/signals3010001

来源: DOAJ

【 摘 要 】

Long-range (LoRa) communication has attracted much attention recently due to its utility for many Internet of Things applications. However, one of the key problems of LoRa technology is that it is vulnerable to noise/interference due to the use of only up-chirp signals during modulation. In this paper, to solve this problem, unlike the conventional LoRa modulation scheme, we propose a modulation scheme for LoRa communication based on joint up- and down-chirps. A fast Fourier transform (FFT)-based demodulation scheme is devised to detect modulated symbols. To further improve the demodulation performance, a hybrid demodulation scheme, comprised of FFT- and correlation-based demodulation, is also proposed. The performance of the proposed scheme is evaluated through extensive simulation results. Compared to the conventional LoRa modulation scheme, we show that the proposed scheme exhibits over 3 dB performance gain at a bit error rate of ${10}^{-4}$.

【 授权许可】

Unknown