Increasing cross-correlation in LoRaWAN RSSI based key generation with DCT and PCA

Pedro Cruz, Matheus C Damasceno, Ricardo Suyama, Murilo Bellezoni Loiola

DOI: 10.14209/SBRT.2020.1570658181

Evento: XXXVIII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2020)

Keywords: physical layer security wireless communications signal processing

Abstract

Physical-layer Key generation for wireless networks has been considered a promising alternative to traditional techniques based on pseudorandom number generators. This work evaluates key generation in a Long Range Wide Area (LoRaWAN) based on Received Signal Strength Indicator (RSSI) values, measured during the reception of LoRaWAN packets. This work uses Discrete Cosine Transform (DCT) and Principal Component Analysis (PCA) to increase reciprocity in the measurements. The usage of PCA for this purpose with RSSI values is a novelty in this work. Simulation results indicate that PCA can produce higher correlation values and lower key disagreement rate (KDR) than DCT.

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