4.8 Article

Slope-Shift Keying LoRa-Based Modulation

期刊

IEEE INTERNET OF THINGS JOURNAL
卷 8, 期 1, 页码 211-221

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2020.3004318

关键词

Chirp; Modulation; Internet of Things; Receivers; Correlation; Rayleigh channels; Bit-error-rate (BER) performance; chirp-spread spectrum modulation; LoRaWAN; low-power long range (LoRa); noncoherent detection; Rayleigh fading; slope-shift keying (SSK)

资金

  1. NSERC/Cisco Industrial Research Chair in Low-Power Wireless Access for Sensor Networks

向作者/读者索取更多资源

This article proposes a new modulation scheme called SSK-LoRa by adding a set of new orthonormal basis functions to the existing LoRa system to increase achievable data rate. Low-complexity optimum coherent and noncoherent detection algorithms are developed for SSK-LoRa modulation, with closed-form analytical and tight approximations for error probabilities in Rayleigh fading environment. The SSK-LoRa scheme is shown to outperform state-of-the-art LoRa-based modulation schemes.
LoRa, a low-power long-range physical-layer communication method, is one of the emerging technologies in low-power wide-area networks (LPWANs). In LoRa, a linearly varying-frequency up chirp and its cyclic shifts act as an orthonormal basis set for message representation. The number of orthonormal basis functions dictates the achievable bit rate of a LoRa system. This article aims to increase the achievable data rate of a conventional LoRa system by adding a set of new orthonormal basis functions to the existing set. Specifically, we use a linearly varying-frequency down chirp and its cyclic shifts to generate the second set of orthonormal basis functions in the proposed scheme, named slope-shift-keying LoRa (SSK-LoRa) modulation. We also develop both low-complexity optimum coherent and noncoherent detection algorithms for the proposed SSK-LoRa modulation. We then obtain closed-form analytical and tight approximations for the bit and symbol error probabilities of noncoherent detection in a Rayleigh fading environment. Our proposed SSK-LoRa scheme is shown to outperform the state-of-the-art LoRa-based modulation schemes.

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