Interference Cancellation to Enhance Transmission Reliability in LPWAN 


Vol. 45,  No. 3, pp. 482-491, Mar.  2020
10.7840/kics.2020.45.3.482


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  Abstract

In LoRa, the representative communication technology in LPWAN, two signals generated by different spreading factors can be separated at the receiver even if they overlap. However, since the LoRa signals are not perfectly orthogonal to each other, the demodulation of the overlapping signals is affected by the interference. Therefore, when the difference between the two signal strengths is too large, the strong signal can be demodulated correctly, but the demodulation for the weak signal might be failed, i.e., the capture effect occurs. In this paper, we propose a signal processing technique that protects weak signal demodulation from interferences to enhance the transmission reliability of the LoRa system. The proposed method first detects the stronger one and then it is removes it from the overlapping signal. As a result, since only the weak signal remains, demodulation can be conducted without the impact of interferences. In particular, the proposed method is highly compatable because only the IFFT block is added for the signal separation. Simulation results show that the proposed method improves transmission reliability by eliminating the impact of interference on the LoRa demodulation.

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  Cite this article

[IEEE Style]

S. Kim, K. Kim, C. Kim, J. Kim, "Interference Cancellation to Enhance Transmission Reliability in LPWAN," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 3, pp. 482-491, 2020. DOI: 10.7840/kics.2020.45.3.482.

[ACM Style]

Sungryul Kim, Kiwook Kim, Cheonyong Kim, and Joobum Kim. 2020. Interference Cancellation to Enhance Transmission Reliability in LPWAN. The Journal of Korean Institute of Communications and Information Sciences, 45, 3, (2020), 482-491. DOI: 10.7840/kics.2020.45.3.482.

[KICS Style]

Sungryul Kim, Kiwook Kim, Cheonyong Kim, Joobum Kim, "Interference Cancellation to Enhance Transmission Reliability in LPWAN," The Journal of Korean Institute of Communications and Information Sciences, vol. 45, no. 3, pp. 482-491, 3. 2020. (https://doi.org/10.7840/kics.2020.45.3.482)

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pISSN : 1226 - 4717
eISSN : 2287 - 3880